CN204481687U - A kind of DC/DC transducer - Google Patents
A kind of DC/DC transducer Download PDFInfo
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- CN204481687U CN204481687U CN201520163536.5U CN201520163536U CN204481687U CN 204481687 U CN204481687 U CN 204481687U CN 201520163536 U CN201520163536 U CN 201520163536U CN 204481687 U CN204481687 U CN 204481687U
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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
Abstract
The utility model relates to a kind of DC/DC transducer, comprises inversion unit, resonant element, high frequency transformer and rectification filtering unit; Described inversion unit comprise half-bridge circuit under the control signal effect of asymmetric, complementary pulse width modulation or full-bridge circuit under constant frequency phase shifting control, by direct current input be converted to square wave; Described resonant element obtains its square wave exported by described inversion unit and makes its resonance, and described resonant element comprises resonant inductance, the first resonant capacitance and the second resonant capacitance; Described rectification filtering unit is adopt double current rectify, full-wave rectification or full-bridge rectification mode to combine all kinds of LC filtering the AC wave shape on the secondary of described high frequency transformer to be converted to direct current output.Implement a kind of DC/DC transducer of the present utility model, there is following beneficial effect: control mode is simple, output ripple is little, conversion efficiency is high, design of transformer is simple.
Description
Technical field
The utility model relates to power supply, more particularly, relates to a kind of DC/DC transducer.
Background technology
In general, resonant network is applied to power conversion circuit, effectively can reduce the switching loss of circuit and noise, reduction electromagnetic interference, reduce the voltage and current pressure of device, for converter improves switching frequency, raises the efficiency, reduces volume weight, improves power density and create good condition.Current application more widely LLC resonance topological all adopts PFM to control in control method, and namely switching frequency is change, and it is complicated that this makes its control method design; When adopting PFM to control, transformer needs according to lowest operating frequency design, and transformer design itself is complicated, and difficult parameters is to optimize; Also because variable frequency control causes synchronous rectification driver circuit complicated in employing circuit of synchronous rectification; LLC resonance topological exports and usually adopts capacitor filtering, electric capacity is born resonance ripple current, and not only loss is large, and heating is serious, and output ripple is also large.Therefore, need the combination seeking a kind of circuit or circuit and control mode can not only realize realizing in wide loading range the Sofe Switch of switching tube, and the design of transformer and secondary synchronous rectification driving can be simplified.
Utility model content
The technical problems to be solved in the utility model is, when above-mentioned resonant network for prior art is used for converter, control mode is complicated, design of transformer cannot be optimized, secondary synchronous rectification drived control difficult design, defect that output ripple is large, provides that a kind of control mode is simple, transformer can optimal design, synchronous rectification Design of Drive and Control Circuit is simple, output ripple electric current is little a kind of DC/DC transducer.
The utility model solves the technical scheme that its technical problem adopts: construct a kind of DC/DC transducer, comprise inversion unit, resonant element, high frequency transformer and rectification filtering unit; Described inversion unit comprise half-bridge circuit under the control signal effect of asymmetric, complementary pulse width modulation or full-bridge circuit under constant frequency phase shifting control, by direct current input be converted to square wave; Described resonant element obtains its square wave exported by described inversion unit and makes its resonance, and is transferred to the former limit of described high frequency transformer; Described rectification filtering unit adopts double current rectify, full-wave rectification or full-bridge rectification and by LC filtering, the AC wave shape on the secondary of described high frequency transformer is converted to direct current and exports.
Further, described inversion unit comprises the half-bridge circuit be made up of the first controlled switch pipe and the second controlled switch pipe, and one end of direct current input is connected to the other end of direct current input successively by two switch terminals of the first switching tube and two switch terminals of second switch pipe; Described two switching tubes are inputted by its control end respectively, asymmetric, complementary pulse width modulating signal controls its switch; The pulse duration of the control signal on the control end of described first switching tube determines that described inversion unit exports the pulse duration of square wave; Described resonant element inputs one end or the other end by the tie point of described first switching tube and second switch pipe and described direct current and obtains the square wave that described inversion unit exports.
Further, the cycle of the control signal of described first switching tube and the input of second switch pipe control end is preseting length, and when the duty ratio of the control signal of described first controlled switch is D, the duty ratio of the control signal of described second controlled switch is 1-D; Described two control signals in its adjacent low and high level dislocation respectively in advance or postpone a setting width, form the dead band of setting width to prevent the conducting simultaneously of described two switching tubes.
Further, described inversion unit comprises the full bridge inverter adopting constant frequency phase shifting control; Described full bridge inverter comprises the first half-bridge circuit be made up of the first controlled switch pipe and the second controlled switch pipe and the second half-bridge circuit be made up of the 3rd controlled switch pipe and the 4th controlled switch pipe; One end of direct current input is connected to the other end of direct current input successively by two switch terminals of the first switching tube and second switch pipe; Direct current input one end also successively two switch terminals of the 3rd switching tube and the 4th switching tube be connected to direct current input the other end; In a half-bridge circuit two switching tubes inputted by its control end respectively, there is 50% duty ratio and the pulse width modulated modulation signal of phase 180 degree controls its switch separately; Between the control signal of two controlled switch pipes of its topological diagonal positions, have phase difference or the phase shifting angle of setting in described two half-bridge circuits, the phase difference of described setting determines that described inversion unit exports the pulse duration of square wave; Described resonant element obtains by described first switching tube and the tie point of second switch pipe and the tie point of described 3rd switching tube and the 4th switching tube the square wave that described inversion unit exports.
Further, in described first half-bridge circuit and the second half-bridge circuit, in a half-bridge circuit pulse duration of the control signal of two controlled switchs equal, there is 50% duty ratio and phase 180 degree separately, and described two control signals in its adjacent low and high level dislocation respectively in advance or postpone a setting width, forms the dead band of setting width to prevent the conducting simultaneously of described two switching tubes.
Further, described resonant element comprises resonant inductance, the first resonant capacitance and the second resonant capacitance, be serially connected in described inversion unit export on two terminals of square wave with the former limit of described high frequency transformer after described resonant inductance and the series connection of the first resonant capacitance, described second resonant capacitance is attempted by the former limit of described high frequency transformer or secondary or is described former and deputy limit shunt-wound capacitance sum; Described resonant inductance is the leakage inductance of separate inductor or transformer or both sums described; Described second resonant capacitance is independent capacitance or rectifier switch pipe parasitic capacitance or both equivalent capacity of parallel connection described.
Further, the former limit of described high frequency transformer is a winding, and secondary is one or more windings.
Further, described current rectifying and wave filtering circuit comprises rectifying part and filtering part; Described rectifying part comprises rectifying device, and when double current rectify, described rectifying device is adopt the diode of common anode pole or common cathode current-doubling rectifier or the MOSFET for employing circuit of synchronous rectification; Its filtering part is LC combined filter circuit.
Further, described current rectifying and wave filtering circuit comprises rectifying part and filtering part; Described rectifying part comprises rectifying device, and when all-wave or full-bridge rectification, described rectifying device is the diode adopting common anode pole or common cathode rectification circuit; Its filtering part is LC combined filter circuit.
Implement a kind of DC/DC transducer of the present utility model, there is following beneficial effect: because inversion unit adopts asymmetric, complementary PWM drive singal to control conducting and the cut-off of its controlled switch pipe, simultaneously, in resonant element, resonant capacitance is connected on high frequency transformer, therefore, the Sofe Switch of switching tube can be realized at wide loading range, thus reduce switching loss and EMI, filter circuit is made to be easy to design, simultaneously, high frequency transformer parasitic parameter will as resonant element, eliminates its adverse effect to circuit; In addition, rectification filtering unit adopts double current rectify, full-wave rectification or full-bridge rectification to add the mode of LC combined filter, makes its rectifier diode nature commutation, does not have reverse-recovery problems.Due to the existence of resonant element, make power switch pipe conducting or shutoff under no-voltage or zero current condition, achieve the Sofe Switch of power switch pipe, improve conversion efficiency.
Accompanying drawing explanation
Fig. 1 is the structural representation of DC/DC transducer in a kind of DC/DC converter embodiment of the utility model;
Fig. 2 is structural representation when adopting half-bridge asymmetric control in described embodiment;
Fig. 3 is drive waveforms schematic diagram in Fig. 2;
Fig. 4 is the oscillogram in Fig. 2 on AB 2;
Fig. 5 is the structural representation adopting constant frequency to control phase-shifting full-bridge in described embodiment;
Fig. 6 is the drive waveforms schematic diagram of inversion unit in Fig. 5;
Fig. 7 is the oscillogram of AB 2 in Fig. 5;
Fig. 8 is the oscillogram in Fig. 5 on rectifier diode;
Fig. 9 is a kind of distressed structure schematic diagram of DC/DC converter in Fig. 2;
Figure 10 is a kind of distressed structure schematic diagram of DC/DC converter in Fig. 5;
Figure 11-20 is the distressed structure schematic diagram of rectification filtering unit in the utility model embodiment respectively;
Figure 21 is a kind of distressed structure schematic diagram of lc circuit in rectification filtering unit in the utility model embodiment;
Figure 22 is the another kind of distressed structure schematic diagram of lc circuit in rectification filtering unit in the utility model embodiment.
Embodiment
Below in conjunction with accompanying drawing, the utility model embodiment is described further.
As shown in Figure 1, in the embodiment of a kind of DC/DC transducer of the utility model, this DC/DC transducer comprises inversion unit, resonant element, high frequency transformer and rectification filtering unit; Direct current input, under the control signal effect of asymmetric, complementary pulse width modulation (PWM), is converted to square wave by above-mentioned inversion unit; And resonant element obtains its square wave exported by above-mentioned inversion unit and makes its resonance, resonant element comprises the resonant capacitance be attempted by described high frequency transformer; Rectification filtering unit adopts double current rectify, full-wave rectification or full-bridge rectification and by LC filtering, the AC wave shape on the secondary of described high frequency transformer is converted to direct current and exports.Fig. 2 adopts a half-bridge as electrical block diagram during inversion unit in the utility model.In fig. 2, inversion unit comprises Q
1and Q
2and subsidiary component, resonant element comprises L
r, C
sand C
p, rectification filtering unit comprises D
1, D
2, L
f1, L
f2and C
o, high frequency transformer is T
1, and resonant capacitance is electric capacity C in fig. 2
sand C
p; In fig. 2, above-mentioned inversion unit comprises by the first controlled switch Q
1with the second controlled switch Q
2first half-bridge circuit of composition, one end of direct current input is successively by the first controlled switch Q
1two switch terminals and the second controlled switch Q
2two switch terminals be connected to direct current input the other end; In the utility model, controlled switch is metal-oxide-semiconductor, and two switch terminals is its source electrode and drain electrode respectively, and its control end is the grid of this metal-oxide-semiconductor; That above-mentioned two controlled switchs are inputted by its control end respectively, asymmetric, complementary its switch of Pulse Width Modulation Control With signal controlling; That is, control signal or drive singal are applied to above-mentioned first controlled switch Q
1with the second controlled switch Q
2grid, control being switched on or switched off of its source electrode and drain electrode; Wherein, the first switch Q
1control end on the pulse duration of control signal determine that this inversion unit exports the pulse duration of square wave, also determine the size that this transducer exports direct current power; Resonant element is by the first controlled switch Q
1with the second controlled switch Q
2tie point and direct current input the other end obtain inversion unit export square wave, namely by A, B in Fig. 22 obtain inversion unit export square wave.In the utility model, total pulse duration (i.e. pulse period) of the control signal (drive singal) of two controlled switchs in Fig. 2 is identical, but the significant level of these two control signals (namely controlling the level of controlled switch conducting) occurs that position is different, is specifically asymmetric and complementation; In other words, high level or the low level duration of these two signals are unequal, and the addition of the duration of the high level of these two signals equals total pulse period, and its low duration is added and also equals total pulse period.Relation between these two signals is: at the first controlled switch Q
1the duty ratio of control signal when being D, the second controlled switch Q
2the duty ratio of control signal be 1-D; And described two control signals in its adjacent position respectively in advance or postpone a setting width, forms the dead band of setting width to prevent the conducting simultaneously of two controlled switchs
.refer to Fig. 3, in Fig. 3, T
sbe total pulse duration of drive singal, the pulse duration of any one control signal can not equal 1/2, and namely two control signals can not be symmetrical.
In a word, in DC/DC converter circuit in fig. 2, it is input side DC power supply; First controlled switch and the second controlled switch (comprising endophyte diode and the stray inductance of switching tube) form half-bridge; Series resonance inductor, the first resonant capacitance and the second resonant capacitance composition LCC resonant network; For high frequency transformer, its former avris is parallel to the two ends of the second resonant capacitance, its secondary side joint double current rectify topology; Double current rectify topology by fast recovery diode and, output inductor and and output filter capacitor form; For load.
In fig. 2, direct current input accesses the asymmetrical half-bridge topology be made up of the first controlled switch and the second controlled switch, PWM drive singal controls the complementary conducting of two controlled switch pipes and leaves certain dead band (referring to Fig. 3) to avoid leading directly to, by controlling duty cycle adjustment power, at the second controlled switch Q
2between drain-source pole, (A, B two point) in Fig. 2 produces square-wave voltage, puts on LCC resonant network, and the voltage or the electric current that flow through LCC resonant tank are sinusoidal wave or quasi-sine-wave, make the first controlled switch and the conducting under zero voltage condition of the second controlled switch.Transformer primary side (former avris) sinusoidal voltage is coupled to secondary side (secondary side) voltage still for sinusoidal voltage, and secondary side sinusoidal voltage is exported by current-doubling rectifier and connects load, rectifier diode and realize nature commutation.This PWM drive singal as shown in Figure 3.Inversion unit puts on the square-wave voltage of LCC resonant network as shown in Figure 4.
It is worth mentioning that, in the utility model, the asymmetric or asymmetric pulse duration (i.e. the width of significant level) referring to two drive singal is unequal; And complementation refers to that the high level part addition of two drive singal equals (comprising dead band that arrange in advance, that be positioned at two drive signal level dislocations place or isolated area) total width of driving pulse.
Fig. 2 shows the structure of the inversion unit in the utility model under certain situation, and in other situation in the utility model, above-mentioned inversion unit also can be made up of two half-bridges.Refer to Fig. 5, in Figure 5, except the structure of inversion unit and control signal, square wave output are different from Fig. 2, remaining part is roughly identical with Fig. 2.In Figure 5, inversion unit comprises by the first controlled switch Q
1with the second controlled switch Q
2composition the first half-bridge circuit and by the 3rd controlled switch Q
3with the 4th controlled switch Q
4second half-bridge circuit of composition; One end of direct current input is respectively successively by the first switch Q
1with the 3rd switch Q
3two switch terminals and second switch Q
3with the 4th switch Q
4two switch terminals be connected to direct current input the other end; In other words, above-mentioned two half-bridges are connected in parallel on the two ends of direct current input; In a half-bridge circuit two switching tubes inputted by its control end respectively, there is 50% duty ratio and the pulse width modulation control signal of phase 180 degree controls its switch separately; Two half-bridge circuits combine formation full-bridge circuit, between the control signal of two controlled switch pipes of the topological diagonal positions of this full-bridge circuit, have phase difference or the phase shifting angle of setting, the phase difference of this setting determines that described inversion unit exports the pulse duration of square wave; The DC level regulating this phase difference or phase shifting angle just can regulate this DC/DC converter to export.Resonant element is by the first controlled switch Q
1with the second controlled switch Q
2tie point and the 3rd controlled switch Q
3with the 4th controlled switch Q
4tie point obtain the square wave that inversion unit exports, refer to A, B in Fig. 52 point.In Figure 5, in the first half-bridge circuit and the second half-bridge circuit, equal, the phase 180 degree of the pulse duration of the control signal of two controlled switchs in a half-bridge circuit, and these two control signals in its adjacent position respectively in advance or postpone a setting width, forms the dead band of setting width to prevent the conducting simultaneously of two switching tubes; And in the topology of the combination formed at above-mentioned first half-bridge circuit and the second half-bridge circuit, (the Q such as, in Fig. 5 between the controlled switch of diagonal positions
3and Q
2between or Q
1and Q
4between) control signal between the phase difference of difference one setting, namely there is a phase shifting angle, the pulse duration regulating described full bridge inverter by regulating this phase shifting angle and export.About the drive singal in Fig. 5, refer to Fig. 6.
Similarly, in Figure 5, be input side DC power supply; Controlled switch Q
1~ Q
4form (comprising endophyte diode and the stray inductance of switching tube) two half-bridges of phase shift, controlled switch and be the first half-bridge, the phase place of its drive singal is ahead of the second half-bridge; Controlled switch and be the second half-bridge, the delayed phase of its drive singal and the drive singal of above-mentioned first half-bridge; Resonant element comprises series resonance inductor, the first resonant capacitance and the second resonant capacitance composition LCC resonant network equally; For high frequency transformer, primary side (former limit) is parallel to the two ends of the second resonant capacitance, and secondary side (secondary) connects double current rectify topology; Double current rectify topology by fast recovery diode and, output inductor and and output filter capacitor form; For load.It is worth mentioning that, in the utility model, the former limit of above-mentioned high frequency transformer only comprises a winding, and its secondary then can comprise more than one winding.
In Figure 5, by phase-shift PWM controlled controlled switch Q
1-Q
4, A, B point-to-point transmission in Figure 5 produces positive and negative ALT pulse square wave (referring to Fig. 7), puts on LCC resonant network, and the voltage or the electric current that flow through LCC resonant tank are sinusoidal wave or quasi-sine-wave, make controlled switch Q
1-Q
4turn-on and turn-off under no-voltage or zero current condition.Transformer primary side sinusoidal voltage is coupled to secondary Secondary Voltage still for sinusoidal waveform, and secondary side sinusoidal voltage is exported by current-doubling rectifier and connects load, rectifier diode and realize nature commutation.As shown in Figure 6, PWM1 ~ PWM4 is power switch pipe Q
1-Q
4drive singal, the complementary conducting of the PWM drive singal of the controlled switch in each half-bridge also leaves certain dead band and avoids leading directly to; There is phase shifting angle between the switching tube PWM drive singal in diagonal positions, carrying out power adjustment by controlling phase shifting angle.Put on the square-wave voltage of LCC resonant network as shown in Figure 7.Rectifier diode and voltage waveform and as shown in Figure 8.
As mentioned above, in the utility model, in any one in kind of the situation of two shown in Fig. 2 and Fig. 5, its resonant element includes resonant inductance L
r, the first resonant capacitance C
swith the second resonant capacitance C
p, wherein, (series connection) resonant inductance L
rwith the first resonant capacitance C
safter series connection and the former limit of high frequency transformer is serially connected in inversion unit and exports on two terminals of square wave, the second resonant capacitance C
pon the former limit being attempted by described high frequency transformer or secondary.Be connected to the example on high frequency transformer secondary about the second resonant capacitance, refer to Fig. 9 and Figure 10; Wherein, Fig. 9 is inversion unit when being half-bridge circuit, and the second resonant capacitance is connected to the circuit of high frequency transformation secondary, and (now, the second resonant capacitance not only includes C
p ', further comprises the parasitic capacitance of rectifying device); And Figure 10 is inversion unit when being full-bridge circuit, the second resonant capacitance is connected to the circuit (now, the second resonant capacitance includes the parasitic capacitance of rectifying device equally) of high frequency transformation secondary.
In addition, in utility model, rectification filtering unit comprises a switch terminals and is connected to described high frequency transformer secondary two ends, another switch terminals is connected to two rectifier switchs on common potential end, the positive output end that the switch terminals that two rectifier switchs are connected with the high frequency transformer secondary two ends direct current connected together as described rectification filtering unit exports; The direct current negative output terminal of rectification filtering unit is described common potential end; Wherein, rectifier switch comprises the diode (referring to Fig. 2, Fig. 5, Fig. 9 and Figure 10) or metal-oxide-semiconductor (referring to Figure 13 and Figure 14) that its negative electrode is connected with high frequency transformer secondary.
In other situation in the utility model, the bridge rectifier at above-mentioned rectification filtering unit also can be its input be described high frequency transformer secondary two ends, the rectification filtering unit of bridge rectifier comprises diode (referring to Figure 15) or controlled metal-oxide-semiconductor (referring to Figure 16)
.above-mentioned rectification filtering unit can also be full-wave rectifying circuit, and the rectification filtering unit of full-wave rectifying circuit comprises diode (referring to Figure 17 and Figure 19) or controlled metal-oxide-semiconductor (referring to Figure 18 and Figure 20).
In above-mentioned any one situation, rectification filtering unit also comprises filtration module, and filtration module comprises filter inductance (L
f1, L
f2) and filter capacitor C
o; Wherein, filter inductance (L
f1, L
f2) be serially connected between direct current positive output end and rectifier diode negative terminal or on the positive output end of bridge rectifier, filter capacitor C
obe attempted by between direct current positive output end and negative output terminal.It is worth mentioning that, in bridge rectifier, above-mentioned two filter inductances also can merge into one.
Figure 11 to Figure 20 shows the derivative circuit of rectification filtering unit in the utility model, and that is, in any one situation of the present utility model, rectification filtering unit can adopt any one form in Figure 11 to Figure 20.Being briefly described below Figure 11 to Figure 20: current-doubling rectifier has two kinds of forms, Fig. 2, Fig. 5, Fig. 9, Figure 10, Figure 12 and Figure 13 are wherein a kind of circuit forms, Figure 11 and Figure 14 is another kind of circuit form; Fig. 2, Fig. 5, Fig. 9, Figure 10, Figure 11 and Figure 12 adopt diode rectification, Figure 13 and Figure 14 adopts synchronous rectification; Figure 15 is the full bridge rectifier adopting diode rectification, and Figure 16 is the full bridge rectifier adopting synchronous rectification; Figure 17 and Figure 19 is the full-wave rectifying circuit adopting diode rectification, Figure 18 and Figure 20 is the full-wave rectifying circuit adopting synchronous rectification.
In addition, Figure 21 and Figure 22 lc circuit that sets forth in the utility model in rectification filtering unit two kinds of distressed structures that may exist.In figure 21, an inductance of usually connecting with filter capacitor is split as two, and is connected in the loop at filter capacitor two ends respectively; And in Figure 22, to be originally inductance and the electric capacity of one respectively, be split as two respectively, between each inductance and electric capacity, the mode of still series connection connects, obtain the LC filter circuit that two joints are independent like this, between the output that first segment LC filter circuit is connected to direct current output and ground, second section LC filter circuit is attempted by the filter capacitor two ends of first segment LC filter circuit, and load is attempted by the filter capacitor two ends of second section LC filter circuit.Benefit inductance or electric capacity split like this is inductance value or the capacitance that can reduce discrete component, thus reduces the volume of discrete component, can adapt to the occasion to space or cost sensitivity.
It is worth mentioning that, in the utility model, form the unit of DC/DC converter in above-mentioned various situation, comprise inversion unit, rectification filtering unit, resonant element and rectification filtering unit, be not limited only to above-mentioned explanation.Those skilled in the art reasonably can also combine the connection between the formation of above-mentioned each unit or each unit, convert or revise according to the common practise of this area.
The above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (9)
1. a DC/DC transducer, is characterized in that, comprises inversion unit, resonant element, high frequency transformer and rectification filtering unit; Described inversion unit comprise half-bridge circuit under the control signal effect of asymmetric, complementary pulse width modulation or full-bridge circuit under constant frequency phase shifting control, by direct current input be converted to square wave; Described resonant element obtains its square wave exported by described inversion unit and makes its resonance, and is transferred to the former limit of described high frequency transformer; Described rectification filtering unit adopts double current rectify, full-wave rectification or full-bridge rectification and by LC filtering, the AC wave shape on the secondary of described high frequency transformer is converted to direct current and exports.
2. DC/DC transducer according to claim 1, it is characterized in that, described inversion unit comprises the half-bridge circuit be made up of the first controlled switch pipe and the second controlled switch pipe, and one end of direct current input is connected to the other end of direct current input successively by two switch terminals of the first switching tube and two switch terminals of second switch pipe; Described two switching tubes are inputted by its control end respectively, asymmetric, complementary pulse width modulating signal controls its switch; The pulse duration of the control signal on the control end of described first switching tube determines that described inversion unit exports the pulse duration of square wave; Described resonant element inputs one end or the other end by the tie point of described first switching tube and second switch pipe and described direct current and obtains the square wave that described inversion unit exports.
3. DC/DC transducer according to claim 2, it is characterized in that, the cycle of the control signal of described first switching tube and the input of second switch pipe control end is preseting length, when the duty ratio of the control signal of described first controlled switch is D, the duty ratio of the control signal of described second controlled switch is 1-D; Described two control signals in its adjacent low and high level dislocation respectively in advance or postpone a setting width, form the dead band of setting width to prevent the conducting simultaneously of described two switching tubes.
4. DC/DC transducer according to claim 1, is characterized in that, described inversion unit comprises the full bridge inverter adopting constant frequency phase shifting control; Described full bridge inverter comprises the first half-bridge circuit be made up of the first controlled switch pipe and the second controlled switch pipe and the second half-bridge circuit be made up of the 3rd controlled switch pipe and the 4th controlled switch pipe; One end of direct current input is connected to the other end of direct current input successively by two switch terminals of the first switching tube and second switch pipe; Direct current input one end also successively two switch terminals of the 3rd switching tube and the 4th switching tube be connected to direct current input the other end; In a half-bridge circuit two switching tubes inputted by its control end respectively, there is 50% duty ratio and the pulse width modulated modulation signal of phase 180 degree controls its switch separately; Between the control signal of two controlled switch pipes of its topological diagonal positions, have phase difference or the phase shifting angle of setting in described two half-bridge circuits, the phase difference of described setting determines that described inversion unit exports the pulse duration of square wave; Described resonant element obtains by described first switching tube and the tie point of second switch pipe and the tie point of described 3rd switching tube and the 4th switching tube the square wave that described inversion unit exports.
5. DC/DC transducer according to claim 4, it is characterized in that, in described first half-bridge circuit and the second half-bridge circuit, in a half-bridge circuit pulse duration of the control signal of two controlled switchs equal, there is 50% duty ratio and phase 180 degree separately, and described two control signals in its adjacent low and high level dislocation respectively in advance or postpone a setting width, forms the dead band of setting width to prevent the conducting simultaneously of described two switching tubes.
6. DC/DC transducer according to claim 1, it is characterized in that, described resonant element comprises resonant inductance, the first resonant capacitance and the second resonant capacitance, be serially connected in described inversion unit export on two terminals of square wave with the former limit of described high frequency transformer after described resonant inductance and the series connection of the first resonant capacitance, described second resonant capacitance is attempted by the former limit of described high frequency transformer or secondary or is described former and deputy limit shunt-wound capacitance sum; Described resonant inductance is the leakage inductance of separate inductor or transformer or both sums described; Described second resonant capacitance is independent capacitance or rectifier switch pipe parasitic capacitance or both equivalent capacity of parallel connection described.
7. DC/DC transducer according to claim 1, is characterized in that, the former limit of described high frequency transformer is a winding, and secondary is one or more windings.
8. DC/DC transducer according to claim 7, is characterized in that, described current rectifying and wave filtering circuit comprises rectifying part and filtering part; Described rectifying part comprises rectifying device, and when double current rectify, described rectifying device is adopt the diode of common anode pole or common cathode current-doubling rectifier or the MOSFET for employing circuit of synchronous rectification; Its filtering part is LC combined filter circuit.
9. DC/DC transducer according to claim 7, is characterized in that, described current rectifying and wave filtering circuit comprises rectifying part and filtering part; Described rectifying part comprises rectifying device, and when full-wave rectification, described rectifying device is the diode adopting common anode pole or common cathode rectification circuit; Its filtering part is LC combined filter circuit.
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| CN201520163536.5U CN204481687U (en) | 2015-03-23 | 2015-03-23 | A kind of DC/DC transducer |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734520A (en) * | 2015-03-23 | 2015-06-24 | 深圳市皓文电子有限公司 | DC/DC converter |
| CN110739876A (en) * | 2018-07-20 | 2020-01-31 | 郑州宇通客车股份有限公司 | inverter control method and device |
-
2015
- 2015-03-23 CN CN201520163536.5U patent/CN204481687U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104734520A (en) * | 2015-03-23 | 2015-06-24 | 深圳市皓文电子有限公司 | DC/DC converter |
| CN110739876A (en) * | 2018-07-20 | 2020-01-31 | 郑州宇通客车股份有限公司 | inverter control method and device |
| CN110739876B (en) * | 2018-07-20 | 2020-10-02 | 郑州宇通客车股份有限公司 | Inverter control method and device |
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