CN103427649A - Power supply converter and control method thereof - Google Patents
Power supply converter and control method thereof Download PDFInfo
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- CN103427649A CN103427649A CN2012101656108A CN201210165610A CN103427649A CN 103427649 A CN103427649 A CN 103427649A CN 2012101656108 A CN2012101656108 A CN 2012101656108A CN 201210165610 A CN201210165610 A CN 201210165610A CN 103427649 A CN103427649 A CN 103427649A
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Abstract
The invention discloses a power supply converter which comprises a full bridge type switching circuit, a resonant circuit, a transformer, an overvoltage protection unit, a pulse width modulation control unit, a trigger control unit and a drive unit. The overvoltage protection unit detects the output voltage of the power supply converter and generates an output voltage signal. The pulse width modulation control unit generates a pulse width modulation signal. The trigger control unit receives the output voltage signal and the pulse width modulation signal, and generates a trigger control signal. When the overvoltage protection unit detects that the output voltage is an overvoltage, the trigger control unit outputs the trigger control signal of low level at the end of the work period of the pulse width modulation signal, so as to forbid the drive unit.
Description
Technical field
The relevant a kind of power supply changeover device of the present invention and control method thereof, espespecially a kind of power supply changeover device and control method thereof of the charging device for moving carrier.
Background technology
Now, moving carrier development is when pollution-free, dynamical motorized motions.Yet the container that must using as energy storage by battery as the energy of motorized motions, make the energy to be stored in battery.By by the energy, for example firepower, waterpower, wind-force, heat energy, solar energy and nuclear energy ... after converting electric energy to, electric energy can be done suitably and be stored in battery after conversion.Yet, in the process of electric energy conversion, must consider the problems such as fail safe, high-effect and convenience.
Referring to Fig. 1, is the block schematic diagram of the moving carrier charging device of prior art.As shown in the figure, this charging device 10A receives an external communication voltage Vs, and changes this external communication voltage Vs into a direct current output voltage V o, so that a rechargeable battery 20A is charged.
This charging device 10A comprises an Electromagnetic interference filter 102A, a power factor corrector 104A, an isolated supplies transducer 106A (isolated DC-to-DC converter) and a non-isolation type power supply changeover device 108A (non-isolated DC-to-DC converter).This Electromagnetic interference filter 102A receives this external ac power source Vs, to eliminate the noise of this AC power Vs, and prevents the interference of conductibility electromagnetic noise.This power factor corrector 104A is electrically connected this Electromagnetic interference filter 102A, to improve the power factor of the DC power supply after changing.This isolated supplies transducer 106A is electrically connected this power factor corrector 104A, to change and to export the energy that direct voltage was produced of this power factor corrector 104A output.This non-isolation type power supply changeover device 108A is electrically connected this isolated supplies transducer 106A, with conversion and the adjustment that different VD Vo level are provided, and then exports the required recharge voltage level of this rechargeable battery 20A.
Be worth mentioning, existing practice application is upper, and this isolated supplies transducer 106A mainly adopts LLC full-bridge series resonance formula transducer (LLC full-bridge series resonant converter).Resonant converter is by the mode of resonant circuit and frequency modulating, and makes current phase fall behind voltage-phase according to load characteristic, to reach zero voltage switching; If or current phase leading voltage phase place, can reach zero current switching.Tradition mode of resonance transducer mainly is divided into series resonance, parallel resonance and series parallel resonance.Although these three kinds of circuit frameworks can reach no-voltage or zero current switching, concerning series resonant converter, under the underloading operational circumstances, will cause adjusting output voltage, and produce the problem in voltage stabilizing.The LLC resonant converter is to be combined differentiation with series resonant circuit by semibridge system or full-bridge converter, during the normal working voltage operation, the work period of power switch, (duty cycle) operated in the complementary signal that approaches 50%, and reached output voltage stabilization by the modulation of switching frequency.
The block schematic diagram of the LLC full-bridge series resonance formula transducer that cooperation is prior art referring to Fig. 2.The control framework of this isolated supplies transducer 106A is for opening loop design.Owing to opening the loop circuit framework, the stabilized voltage characteristic of its output voltage is relevant with the conduction voltage drop of load, work period size and power component, therefore, as this isolated supplies transducer 106A under underloading pattern operation, the lifting that can constantly make progress of its output voltage, and cause poor stabilized voltage characteristic.So, can reach voltage stabilizing when the underloading and control for asking, so control loop is used overvoltage protection (over-voltage protection) usually.
The circuit box schematic diagram of the power supply changeover device that to refer to Fig. 2 be the prior art charging device.The power supply changeover device 106A of this charging device is electrically connected a direct current input voltage (not indicating), the energy produced to change and to export this DC input voitage.This power supply changeover device 106A comprises a full-bridge type commutation circuit 1061A, a resonant circuit 1062A, a transformer 1063A, an overvoltage protective unit 1064A, a pulse width modulation control unit 1065A and a driver element 1067A.
This full-bridge type commutation circuit 1061A comprises two brachium pontis (not indicating) that four power switch components form, and take and switches this DC input voitage as a square-wave voltage (not shown).This resonant circuit 1062A is electrically connected this full-bridge type commutation circuit 1061A, to receive and to change this square-wave voltage into a resonance potential (not shown).Wherein, this resonant circuit 1062A comprises a resonant capacitance Cr and two resonant inductances (being respectively a leakage inductance Lr and a magnetizing inductance (not shown)), a formed LLC resonant circuit.This transformer 1063A has an input side and an outlet side, and this input side is electrically connected this resonant circuit 1062A, to receive this resonance potential.Wherein, this input side comprises at least one first side winding (not indicating), and this outlet side comprises at least one secondary side winding (not indicating).From the above, leakage inductance Lr and magnetizing inductance that this resonant inductance that this resonant circuit 1062A comprises is this transformer 1063A primary side inside.
This overvoltage protective unit 1064A is electrically connected this outlet side of this transformer 1063A, to detect this power supply changeover device 106A output voltage, and produces an output voltage signal Sovp, and then this power supply changeover device 106A is provided to the protection of overvoltage output.This pulse width modulation (PWM) control unit 1065A, produce a pulse width modulation signal.Wherein, due to this full-bridge type commutation circuit, 1061A is consisted of two groups of brachium pontis, and every group of brachium pontis is comprised of two power switch components, therefore, this pulse width modulation control unit 1065A produces this pulse width modulation signal and comprises one first pulse width modulation signal Spwm1 and one second pulse width modulation signal Spwm2, wherein, the conducting of this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 is complementary level with cut-off.
Wherein, when this overvoltage protective unit 1064A detects the output of this power supply changeover device 106A generation overvoltage; this overvoltage protective unit 1064A produces this output voltage signal Sovp, the driving with this driver element of forbidden energy (disable) 1067A to this full-bridge type commutation circuit 1061A.Otherwise; after having served as the eliminating of Voltage-output situation; it is operating voltage when output that this overvoltage protective unit 1064A detects this power supply changeover device 106A, and this overvoltage protective unit 1064A produces this output voltage signal Sovp driving to this full-bridge type commutation circuit 1061A with this driver element of activation (enable) 1067A.In addition, this power supply changeover device 106A also comprises an optical coupling unit 1068A, makes this overvoltage protective unit 1064A can pass through this optical coupling unit 1068A, and this output voltage signal Sovp is sent to this driver element 1067A.
Only; above-mentioned this output voltage signal Sovp forbidden energy or this driver element of activation 1067A; owing to this power supply changeover device 106A being detected as this overvoltage protective unit 1064A and overvoltage output or overvoltage output situation occur get rid of, the random shutoff occurred immediately and random action of opening.The control sequential chart that cooperation is this pulse width modulation control unit of prior art and this driver element referring to Fig. 3.As shown in the figure, from top to bottom represent respectively that this first pulse width modulation signal Spwm1, this second pulse width modulation signal Spwm2, this short circuit prevent time T d, this output voltage signal Sovp, this gate drive signal Sga, Sgd and this gate drive signal Sgb, Sgc.
As mentioned above, this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 are complementary conducting and cut-off, wherein, this the first pulse width modulation signal Spwm1 is conducting state (now, this second pulse width modulation signal Spwm2 is cut-off state) at interval t10～t11 of a time; This second pulse width modulation signal Spwm2 an interval t12～t13 of time be conducting state (now, this the first pulse width modulation signal Spwm1 is cut-off state), and this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 are periodic complementary switched conductive and cut-off.
Moreover; suppose that overvoltage output occurs this power supply changeover device 106A when a time tov; that is; when this overvoltage protective unit 1064A detects the output of this power supply changeover device 106A generation overvoltage; therefore, to produce this output voltage signal Sovp be low level signal to this overvoltage protective unit 1064A.Owing to having served as Voltage-output and occur (that is, occur in time interval t12～t13), this the second pulse width modulation signal Spwm2 be the high level conducting state (relatively, this the first pulse width modulation signal Spwm1 is the low level cut-off state), therefore, this output voltage signal Sovp changes low level into by high level immediately, and this driver element of forbidden energy 1067A.In like manner, if the overvoltage of time point generation arbitrarily output in time interval t12～t13, it is random this driver element 1067A that turn-offs that this overvoltage protective unit 1064A produces this output voltage signal Sovp.
Otherwise; suppose that this power supply changeover device 106A gets rid of overvoltage output situation when a time tnv; that is; it is operating voltage output that this overvoltage protective unit 1064A detects this power supply changeover device 106A; therefore, to produce this output voltage signal Sovp be high level signal to this overvoltage protective unit 1064A.Due to when operating voltage output occurs (that is, occur in time interval t14～t15), this the first pulse width modulation signal Spwm1 be the high level conducting state (relatively, this the second pulse width modulation signal Spwm2 is the low level cut-off state), therefore, this output voltage signal Sovp changes high level into by low level immediately, and this driver element of activation 1067A is to the driving of this full-bridge type commutation circuit 1061A.In like manner, if the overvoltage of time point eliminating is arbitrarily exported situation in time interval t14～t15, it is random this driver element 1067A that opens that this overvoltage protective unit 1064A produces this output voltage signal Sovp.
Therefore, the work period (duty cycle) that will cause the square-wave signal of this driver element of this forbidden energy or activation 1067A is the incomplete cycle, that is, may turn-off for 5%, 10% or 15% square-wave cycle do not waited is random and random this driver element 1067A that opens, so, to cause the energy be stored in energy-storage travelling wave tube can't discharge within a work period, abrupt release energy in next cycle, cause and cause eventually short circuit (short through) phenomenon to occur on the contrary.
Therefore; how to design a kind of power supply changeover device and control method thereof; when overvoltage protective unit detects the output of power supply changeover device generation overvoltage; the output voltage signal that overvoltage protective unit produced is controlled trigger control unit; make trigger control unit when the work period of pulse wave width modulation signal finishes; the output Trig control signal, with the forbidden energy driver element, is a large problem that overcomes and solve for this case creator institute wish row.
Summary of the invention
A purpose of the present invention is to provide a kind of power supply changeover device, to overcome the problem of prior art.
Power supply changeover device of the present invention comprises a full-bridge type commutation circuit, a resonant circuit, a transformer, an overvoltage protective unit, a pulse width modulation control unit, a trigger control unit and a driver element.
This full-bridge type commutation circuit is changed a direct current input voltage into a square-wave voltage.This resonant circuit is electrically connected this full-bridge type commutation circuit, receives this square-wave voltage and is converted to a resonance potential.This transformer has an input side and an outlet side, and this input side is electrically connected this resonant circuit, receives this resonance potential.This overvoltage protective unit is electrically connected this outlet side, detects an output voltage of this outlet side, and produces an output voltage signal.This pulse width modulation control unit produces a pulse width modulation signal.This trigger control unit receives this output voltage signal and this pulse width modulation signal, and produces a Trig control signal.This driver element receives this Trig control signal and this pulse width modulation signal, to drive this conducting of full-bridge type commutation circuit and cut-off.
Wherein, when this overvoltage protective unit detects this output voltage and is an overvoltage; when this trigger control unit finished in the work period of this pulse width modulation signal, this Trig control signal of output low level, with this driver element of forbidden energy (disable).
Another object of the present invention is to provide a kind of control method of power supply changeover device, to overcome the problem of prior art.Therefore the step of the control method of power supply changeover device of the present invention comprises: a full-bridge type commutation circuit, a resonant circuit and a transformer (a) are provided; (b) provide an overvoltage protective unit, detect an output voltage of this power supply changeover device, and produce an output voltage signal; (c) provide a pulse width modulation control unit, produce a pulse width modulation signal; (d) provide a trigger control unit, receive this output voltage signal and this pulse width modulation signal, and produce a Trig control signal; (e) provide a driver element, receive this Trig control signal and this pulse width modulation signal, drive this conducting of full-bridge type commutation circuit and cut-off; And (f) when this overvoltage protective unit detects this output voltage and is an overvoltage; when this trigger control unit finished in the work period of this pulse width modulation signal; this Trig control signal of output low level, with this driver element of forbidden energy (disable).
Reach in order further to understand the present invention technology, means and the effect that predetermined purpose is taked, refer to following about detailed description of the present invention and accompanying drawing, believe purpose of the present invention, feature and characteristics, when obtaining thus one deeply and concrete understanding, yet appended graphic only provide with reference to and explanation use, not be used for to the present invention's limitr in addition.
The accompanying drawing explanation
The block schematic diagram of the moving carrier charging device that Fig. 1 is prior art;
The block schematic diagram of the LLC full-bridge series resonance formula transducer that Fig. 2 is prior art;
The control sequential chart that Fig. 3 is this pulse width modulation control unit of prior art and this driver element;
The circuit box schematic diagram of the power supply changeover device that Fig. 4 is charging device of the present invention;
The circuit diagram that Fig. 5 is this trigger control unit of the present invention;
The control sequential chart that Fig. 6 is this pulse width modulation control unit of the present invention, this trigger control unit and this driver element; And
The flow chart of the control method that Fig. 7 is charging device power supply changeover device of the present invention.
Wherein, description of reference numerals is as follows:
﹝ Xian You Ji Shu ﹞
The 10A charging device;
The 102A Electromagnetic interference filter;
The 104A power factor corrector;
106A isolated supplies transducer;
108A non-isolation type power supply changeover device;
The 20A rechargeable battery;
1061A full-bridge type commutation circuit;
The 1062A resonant circuit;
The 1063A transformer;
The 1064A overvoltage protective unit;
1065A pulse width modulation control unit;
The 1067A driver element;
The 1068A optical coupling unit;
Vs external communication voltage;
The Vo VD;
The Cr resonant capacitance;
The Lr resonant inductance;
The Sovp output voltage signal;
Spwm1 the first pulse width modulation signal;
Spwm2 the second pulse width modulation signal;
The Td short circuit prevents the time;
Sga～Sgd gate drive signal;
T10～t15 time;
Tov overvoltage output time;
Tnv operating voltage output time;
This Fa of ﹝ Ming ﹞
102 Electromagnetic interference filter;
104 power factor correctors;
106 isolated supplies transducers;
108 non-isolation type power supply changeover devices;
1061 full-bridge type commutation circuits;
1062 resonant circuits;
1063 transformers;
1064 overvoltage protective units;
1065 pulse width modulation control units;
1066 trigger control unit;
1067 driver elements;
1068 optical coupling units;
10662 positive edge trigger D flip-flop;
10664 NOR gate;
Qa the first power switch component;
Qb the second power switch component;
Qc the 3rd power switch component;
Qd the 4th power switch component;
The Cr resonant capacitance;
The Lr resonant inductance;
The Sovp output voltage signal;
Spwm1 the first pulse width modulation signal;
Spwm2 the second pulse width modulation signal;
The Td short circuit prevents the time;
Ty1 time of delay;
Ty2 time of delay;
The Sen Trig control signal;
The Sga first grid drives signal;
The Sgb second grid drives signal;
Sgc the 3rd gate drive signal;
Sgd the 4th gate drive signal;
The D data input pin;
CLK clock pulse input;
The Q output;
T20～t25 time;
Tov overvoltage output time;
Tnv operating voltage output time;
S100～S600 step.
Embodiment
Hereby, about the technical content and a detailed description, coordinate graphic being described as follows:
The circuit box schematic diagram of the power supply changeover device that to refer to Fig. 4 be charging device of the present invention.Wherein, this charging device comprises an Electromagnetic interference filter, a power factor corrector 104, an isolated supplies transducer 106 (isolated DC-to-DC converter) and a non-isolation type power supply changeover device 108 (non-isolated DC-to-DC converter).Except this isolated supplies transducer 106, above-mentioned circuit arrangement and circuit framework thereof all disclose identically with prior art, therefore, do not repeat them here.Below, will be described in detail for this power supply changeover device 106.
The power supply changeover device 106 of this charging device is electrically connected a direct current input voltage (not indicating), the energy produced to change and to export this DC input voitage.This power supply changeover device 106 comprises a full-bridge type commutation circuit 1061, a resonant circuit 1062, a transformer 1063, an overvoltage protective unit 1064, a pulse width modulation control unit 1065, a trigger control unit 1066 and a driver element 1067.
This full-bridge type commutation circuit 1061 comprises two brachium pontis (not indicating) that four power switch components form, and take and switches this DC input voitage as a square-wave voltage (not shown).That is this full-bridge type commutation circuit 1061 has one first power switch component Qa, one second power switch component Qb, one the 3rd power switch component Qc and one the 4th power switch component Qd.In addition, this full-bridge type commutation circuit 1061 consists of two groups of brachium pontis (not indicating) institute, and every group of brachium pontis is comprised of above-mentioned two power switch components.Wherein, this first power switch component Qa and this second power switch component Qb form one first brachium pontis; The 3rd power switch component Qc and the 4th power switch component Qd form one second brachium pontis.Be worth mentioning, the complementary conducting of this first brachium pontis of this full-bridge type commutation circuit 1061 and this second brachium pontis prevents the time (dead time) or claims Dead Time with cut-off interval one short circuit, to avoid the situation that on same brachium pontis, two power switch components are short-circuited under non-complete conducting or cut-off state.
This resonant circuit 1062 is electrically connected this full-bridge type commutation circuit 1061, to receive and to change this square-wave voltage into a resonance potential (not shown).Wherein, this resonant circuit 1062 comprises a resonant capacitance Cr and two resonant inductances (being respectively a leakage inductance Lr and a magnetizing inductance (not shown)), a formed LLC resonant circuit.
This transformer 1063 has an input side and an outlet side, and this input side is electrically connected this resonant circuit 1062, to receive this resonance potential.Wherein, this input side comprises at least one first side winding (not indicating), and this outlet side comprises at least one secondary side winding (not indicating).From the above, leakage inductance Lr and magnetizing inductance that this resonant inductance that this resonant circuit 1062 comprises is these transformer 1063 primary side inside.
This overvoltage protective unit 1064 is electrically connected this outlet side of this transformer 1063, to detect this power supply changeover device 106 output voltages, and produces an output voltage signal Sovp, and then this power supply changeover device 106 is provided to the protection of overvoltage output.That is in operating process, while occurring surpassing the abnormal voltage of its operating voltage, this overvoltage protective unit 1064 produces this output voltage signal Sovp, and then this power supply changeover device 106 is provided to the protection of overvoltage output when this power supply changeover device 106.This pulse width modulation (PWM) control unit 1065, produce a pulse width modulation signal.Wherein, because this full-bridge type commutation circuit 1061 is consisted of two groups of brachium pontis, and every group of brachium pontis is comprised of two power switch components, therefore, this pulse width modulation control unit 1065 this pulse width modulation signal that produces comprises one first pulse width modulation signal Spwm1 and one second pulse width modulation signal Spwm2, wherein, the conducting of this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 is complementary level with cut-off.Moreover, take the present embodiment as example, this first pulse width modulation signal Spwm1 controls this first power switch component Qa and the 4th power switch component Qd; This second pulse width modulation signal Spwm2 controls this second power switch component Qb and the 3rd power switch component Qc.
This trigger control unit 1066 receives this output voltage signal Sovp and this pulse width modulation signal Spwm1, Spwm2, and produce a Trig control signal Sen.As for the operation of this trigger control unit 1066, more detailed description will be arranged later.This driver element 1067 receives this Trig control signal Sen and this pulse width modulation signal Spwm1, and Spwm2 drives the plurality of power switch component Qa～Qd conducting and the corresponding gate drive signal Sga～Sgd of cut-off to produce.That is this first grid drives signal Sga to drive this first power switch component Qa, this second grid to drive signal Sgb to drive this second power switch component Qb, the 3rd gate drive signal Sgc to drive the 3rd power switch component Qc and the 4th gate drive signal Sgd to drive the 4th power switch component Qd.
Wherein, when this overvoltage protective unit 1064 detects this output voltage and is an overvoltage; this overvoltage protective unit 1064 this output voltage signal Sovp that produces controls this trigger control unit 1066; make this trigger control unit 1066 at this pulse width modulation signal Spwm1; the work period of Spwm2 is while finishing; export this Trig control signal Sen, with the driving of 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of forbidden energy (disable).Otherwise; after having served as the eliminating of Voltage-output situation; this overvoltage protective unit 1064 detects this power supply changeover device 106 while exporting for operating voltage; this overvoltage protective unit 1064 this output voltage signal Sovp that produces controls this trigger control unit 1066; make this trigger control unit 1066 at this pulse width modulation signal Spwm1; the work period of Spwm2, while finishing, is exported the driving of this Trig control signal Sen with 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of activation (enable).To the forbidden energy of this trigger control unit 1066 or the control of activation, more detailed description will be arranged later as for this Trig control signal Sen.In addition, this power supply changeover device 106 also comprises an optical coupling unit 1068, makes this overvoltage protective unit 1064 can pass through this optical coupling unit 1068, and this output voltage signal Sovp is sent to this trigger control unit 1066.
Refer to the circuit diagram that Fig. 5 is this trigger control unit of the present invention.In the present embodiment, this trigger control unit 1066 comprises positive edge triggering D flip-flop (leading-edge triggered D-type flip-flop) 10662 and one NOR gate (NOR gate) 10664.This positive edge triggers D flip-flop 10662 and comprises a data input pin D, a clock pulse input CLK and at least one output Q.This NOR gate 10664 comprises two inputs (not indicating) and an output (not indicating), and this output connects this clock pulse input CLK.Wherein, this data input pin D receives this overvoltage protective unit 1064 this output voltage signal Sovp that produces.This two input of this NOR gate 10664 receives respectively this pulse width modulation signal Spwm1, Spwm2.
Wherein, when this power supply changeover device 106 is overvoltage output, and when this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 are all low level, this positive edge triggers this Trig control signal Sen of D flip-flop 10662 output low levels, with the driving of 1067 pairs of these full-bridge type commutation circuits of this driver element of forbidden energy.That is; when this overvoltage protective unit 1064 detects this output voltage for this overvoltage; this overvoltage protective unit 1064 this output voltage signal Sovp that produces controls this trigger control unit 1066; make this trigger control unit 1066 at this pulse width modulation signal Spwm1; the work period of Spwm2 is while finishing; this Trig control signal Sen of output low level, with the driving of 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of forbidden energy.
In addition, when this power supply changeover device 106 is operating voltage output, and when this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 are all low level, this positive edge triggers this Trig control signal Sen of D flip-flop 10662 output high level, with the driving of 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of activation.That is; after having served as the eliminating of Voltage-output situation; this overvoltage protective unit 1064 detects this power supply changeover device 106 while exporting for operating voltage; this overvoltage protective unit 1064 this output voltage signal Sovp that produces controls this trigger control unit 1066; make this trigger control unit 1066 at this pulse width modulation signal Spwm1; the work period of Spwm2 is while finishing; this Trig control signal Sen of output high level, with the driving of 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of activation.As for above-mentioned this control mode, matching timing figure is described in detail later.
Referring to Fig. 6 is the control sequential chart of this pulse width modulation control unit of the present invention, this trigger control unit and this driver element.As shown in the figure, from top to bottom represent respectively that this first pulse width modulation signal Spwm1, this second pulse width modulation signal Spwm2, this short circuit prevent time T d, this Trig control signal Sen, this gate drive signal Sga, Sgd and this gate drive signal Sgb, Sgc.
As mentioned above, this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 are complementary conducting and cut-off, wherein, this the first pulse width modulation signal Spwm1 is conducting state (now, this second pulse width modulation signal Spwm2 is cut-off state) at interval t20～t21 of a time; This second pulse width modulation signal Spwm2 an interval t22～t23 of time be conducting state (now, this the first pulse width modulation signal Spwm1 is cut-off state), and this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 are periodic complementary switched conductive and cut-off.In addition, interval t21～t22 of a time is described short circuit and prevents time T d.
Moreover; suppose that this power supply changeover device 106 is overvoltage output when a time tov, that is this overvoltage protective unit 1064 detects this power supply changeover device 106 while exporting for overvoltage; therefore, this overvoltage protective unit 1064 this output voltage signal Sovp that produces is low level signal.Owing to having served as Voltage-output and occur (that is, occur in time interval t22～t23), this the second pulse width modulation signal Spwm2 be the high level conducting state (relatively, this the first pulse width modulation signal Spwm1 is the low level cut-off state), therefore, 10664 liang of received level of input of this NOR gate of this trigger control unit 1066 are respectively logical zero level and logical one level, so the output of this NOR gate 10664 produces the logical zero level.Now, this logical zero level provides this clock pulse input CLK that triggers D flip-flop 10662 to this positive edge.In addition, suppose that it is that a positive edge triggers D flip-flop that this positive edge triggers D flip-flop 10662, and initial output valve is the logical one level.This positive edge is triggered to D flip-flop 10662, due to this clock pulse input, CLK is the logical zero level, therefore, this positive edge triggers D flip-flop 10662 and is output as logical one level (being this initial output valve), to maintain the operation of this driver element 1067 of activation.
Until during time t23, when this second pulse width modulation signal Spwm2 changes the low level cut-off state into by the high level conducting state (now, this the first pulse width modulation signal Spwm1 is still the low level cut-off state), due to this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 when the time t23 (that is, when short circuit prevents that time dead time from occurring), it is the logical zero level that this two signal all provides the input of this NOR gate 10664, therefore, after the NOR logical operation, these NOR gate 10664 outputs produce the logical one level, this clock pulse input CLK that triggers D flip-flop 10662 to this positive edge is provided.This positive edge is triggered to D flip-flop 10662, because this clock pulse input CLK receives a high level voltage, therefore, the output transition that this positive edge triggers D flip-flop 10662 is logical zero level (being this output voltage signal Sovp of low level signal), with the operation of this driver element 1067 of forbidden energy.
Otherwise; suppose that this power supply changeover device 106 gets rid of overvoltage output situation when a time tnv; that is; this overvoltage protective unit 1064 detects this power supply changeover device 106 while exporting for operating voltage; therefore, this overvoltage protective unit 1064 this output voltage signal Sovp that produces is high level signal.Due to when operating voltage output occurs (that is, occur in time interval t24～t25), this the first pulse width modulation signal Spwm1 be the high level conducting state (relatively, this the second pulse width modulation signal Spwm2 is the low level cut-off state), therefore, 10664 liang of received level of input of this NOR gate of this trigger control unit 1066 are respectively logical one level and logical zero level, so the output of this NOR gate 10664 produces the logical zero level.Now, this logical zero level provides this clock pulse input CLK that triggers D flip-flop 10662 to this positive edge.This positive edge is triggered to D flip-flop 10662, due to this clock pulse input, CLK is the logical zero level, therefore, this positive edge triggers D flip-flop 10662 and is output as logical zero level (being the logical zero level output valve that maintains front state), to maintain the operation of this driver element 1067 of forbidden energy.
Until during time t25, when this first pulse width modulation signal Spwm1 changes the low level cut-off state into by the high level conducting state (now, this the second pulse width modulation signal Spwm2 is still the low level cut-off state), due to this first pulse width modulation signal Spwm1 and this second pulse width modulation signal Spwm2 when the time t25 (that is, when short circuit prevents that time dead time from occurring), it is the logical zero level that this two signal all provides the input of this NOR gate 10664, therefore, after the NOR logical operation, these NOR gate 10664 outputs produce the logical one level, this clock pulse input CLK that triggers D flip-flop 10662 to this positive edge is provided.This positive edge is triggered to D flip-flop 10662, because this clock pulse input CLK receives a high level voltage, therefore, the output transition that this positive edge triggers D flip-flop 10662 is logical one level (being this output voltage signal Sovp of high level signal), with the operation of this driver element 1067 of activation.
In brief, operation by this trigger control unit 1066, make when this power supply changeover device 106 when time tov is overvoltage output, this trigger control unit 1066 will maintain this Trig control signal Sen of high level originally, to maintain the driving of 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of activation; Until after a time of delay Ty1 (that is, this time of delay Ty1=t23-tov), this trigger control unit 1066 is at this pulse width modulation signal Spwm1, work period of Spwm2 is while finishing (that is, when this short circuit prevents that the time from occurring), this trigger control unit 1066 just produces low level this Trig control signal Sen, with the driving of 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of forbidden energy.Otherwise, make when this power supply changeover device 106 when operating voltage output occurs time tnv, this trigger control unit 1066 will maintain low level this Trig control signal Sen originally, to maintain the driving of 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of forbidden energy; Until after a time of delay Ty2 (that is, this time of delay Ty2=t25-tnv), this trigger control unit 1066 is at this pulse width modulation signal Spwm1, work period of Spwm2 is while finishing (that is, when this short circuit prevents that the time from occurring), this trigger control unit 1066 just produces this Trig control signal Sen of high level, with the driving of 1067 pairs of these full-bridge type commutation circuits 1061 of this driver element of activation.
The flow chart of the control method that to refer to Fig. 7 be charging device power supply changeover device of the present invention.This control method comprises the following step: a full-bridge type commutation circuit, a resonant circuit and a transformer (S100) are provided.Wherein, this full-bridge type commutation circuit comprises two brachium pontis that four power switch components form, and take and switches this DC input voitage as a square-wave voltage.This resonant circuit is electrically connected this full-bridge type commutation circuit, to receive and to change this square-wave voltage into a resonance potential.This transformer has an input side and an outlet side, and this input side is electrically connected this resonant circuit, to receive this resonance potential.One overvoltage protective unit is provided, to detect an output voltage of this power supply changeover device, and produces an output voltage signal (S200).Wherein, this overvoltage protective unit is electrically connected this outlet side of this transformer.Provide a pulse width modulation control unit, to produce a pulse width modulation signal (S300).One trigger control unit is provided, receives this output voltage signal and this pulse width modulation signal, and produce a Trig control signal (S400).Wherein, this trigger control unit comprises a positive edge triggering D flip-flop (leading-edge triggered D-type flip-flop) and a NOR gate (NOR gate).This positive edge triggers D flip-flop and comprises a data input pin, a clock pulse input and at least one output.This NOR gate comprises two inputs and an output, and this output connects this clock pulse input that this positive edge triggers D flip-flop.This data input pin receives this overvoltage protective unit and produces this output voltage signal; This of this NOR gate two inputs receive respectively this pulse width modulation signal.
One driver element is provided, receives this Trig control signal and this pulse width modulation signal, to drive this full-bridge type commutation circuit conducting and cut-off (S500).When this overvoltage protective unit detects this output voltage and is an overvoltage; this overvoltage protective unit produces this output voltage signal and controls this trigger control unit; make this trigger control unit when the work period of this pulse width modulation signal finishes; export this Trig control signal, the driving (S600) with this driver element of forbidden energy (disable) to this full-bridge type commutation circuit.Wherein when this overvoltage protective unit detects this output voltage for this overvoltage output; it is an overvoltage signal that this overvoltage protective unit produces this output voltage signal; to control this Trig control signal of this trigger control unit output low level, the driving with this driver element of forbidden energy to this full-bridge type commutation circuit.Wherein, this overvoltage protective unit can pass through an optical coupling unit, and this output voltage signal is sent to this trigger control unit.When this power supply changeover device is overvoltage output, and this pulse width modulation signal is while being all low level, and this positive edge triggers this Trig control signal of D flip-flop output low level, the driving with this driver element of forbidden energy to this full-bridge type commutation circuit.In addition, the complementary conducting of this two brachium pontis of this full-bridge type commutation circuit prevents the time (dead time) with cut-off interval one short circuit, therefore, when this power supply changeover device is overvoltage output, and when this short circuit prevents that the time from occurring, this positive edge triggers this Trig control signal of D flip-flop output low level, the driving with this driver element of forbidden energy to this full-bridge type commutation circuit.
After having served as the eliminating of Voltage-output situation; when this overvoltage protective unit detects this output voltage and is an operating voltage; this overvoltage protective unit produces this output voltage signal and controls this trigger control unit; make this trigger control unit when the work period of this pulse width modulation signal finishes; export this Trig control signal, the driving with this driver element of activation (enable) to this full-bridge type commutation circuit.When this power supply changeover device is operating voltage output, and this pulse width modulation signal is while being all low level, and this positive edge triggers this Trig control signal of D flip-flop output high level, the driving with this driver element of activation to this full-bridge type commutation circuit.That is when this power supply changeover device is operating voltage output, and this short circuit is while preventing that the time from occurring, this positive edge triggers this Trig control signal of D flip-flop output high level, the driving with this driver element of activation to this full-bridge type commutation circuit.
Only, the above, only for the detailed description of preferred embodiment of the present invention and graphic, only feature of the present invention is not limited to this, not in order to limit the present invention, all scopes of the present invention should be as the criterion with the following claim scope of applying for a patent, all closing in the embodiment of the spirit variation similar with it of the present patent application Patent right requirement scope, all should be contained in category of the present invention, any those skilled in the art in the field of the invention, can think easily and variation or modify the Patent right requirement scope all can be encompassed in this case.
Claims (16)
1. a power supply changeover device comprises:
One full-bridge type commutation circuit, change a direct current input voltage into a square-wave voltage;
One resonant circuit, be electrically connected this full-bridge type commutation circuit, receives this square-wave voltage and be converted to a resonance potential;
One transformer, have an input side and an outlet side, and this input side is electrically connected this resonant circuit, receives this resonance potential;
One overvoltage protective unit, be electrically connected this outlet side, detects an output voltage of this outlet side, and produce an output voltage signal;
One pulse width modulation control unit, produce a pulse width modulation signal;
One trigger control unit, receive this output voltage signal and this pulse width modulation signal, and produce a Trig control signal; And
One driver element, receive this Trig control signal and this pulse width modulation signal, to drive this conducting of full-bridge type commutation circuit and cut-off;
Wherein, when this overvoltage protective unit detects this output voltage and is an overvoltage, when this trigger control unit finished in the work period of this pulse width modulation signal, this Trig control signal of output low level, with this driver element of forbidden energy.
2. power supply changeover device as claimed in claim 1; wherein when this overvoltage protective unit detects this output voltage and is an operating voltage; when this trigger control unit finished in the work period of this pulse width modulation signal, this Trig control signal of output high level, with this driver element of activation.
3. power supply changeover device as claimed in claim 2, wherein this trigger control unit comprises:
One positive edge triggers D flip-flop, comprises a data input pin, a clock pulse input and at least one output; And
One NOR gate, comprise two inputs and an output, and this output connects this clock pulse input;
Wherein, this data input pin receives this output voltage signal; This of this NOR gate two inputs receive respectively this pulse width modulation signal.
4. power supply changeover device as claimed in claim 3, wherein when this output voltage be this overvoltage, and this pulse width modulation signal is while being all low level, this Trig control signal of this positive edge triggering D flip-flop output low level, with this driver element of forbidden energy.
5. power supply changeover device as claimed in claim 3, wherein when this output voltage be this operating voltage, and this pulse width modulation signal is while being all low level, this positive edge triggers this Trig control signal that D flip-flop is exported high level, with this driver element of activation.
6. power supply changeover device as claimed in claim 1, wherein this overvoltage protective unit, by an optical coupling unit, is sent to this trigger control unit by this output voltage signal.
7. power supply changeover device as claimed in claim 3, wherein this full-bridge type commutation circuit comprises two brachium pontis that four power switch components form; The complementary conducting of this two brachium pontis prevents the time with cut-off interval one short circuit; When this output voltage is this overvoltage, and this short circuit time that prevents while occurring, this positive edge triggers this Trig control signal of D flip-flop output low level, with this driver element of forbidden energy.
8. power supply changeover device as claimed in claim 3, wherein this full-bridge type commutation circuit comprises two brachium pontis that four power switch components form; The complementary conducting of this two brachium pontis prevents the time with cut-off interval one short circuit; When this output voltage is this operating voltage, and this short circuit time that prevents while occurring, this positive edge triggers this Trig control signal of D flip-flop output high level, with this driver element of activation.
9. the control method of a power supply changeover device, this control method comprises the following step:
(a) provide a full-bridge type commutation circuit, a resonant circuit and a transformer;
(b) provide an overvoltage protective unit, detect an output voltage of this power supply changeover device, and produce an output voltage signal;
(c) provide a pulse width modulation control unit, produce a pulse width modulation signal;
(d) provide a trigger control unit, receive this output voltage signal and this pulse width modulation signal, and produce a Trig control signal;
(e) provide a driver element, receive this Trig control signal and this pulse width modulation signal, drive this conducting of full-bridge type commutation circuit and cut-off; And
(f), when this overvoltage protective unit detects this output voltage and is an overvoltage, when this trigger control unit finished in the work period of this pulse width modulation signal, this Trig control signal of output low level, with this driver element of forbidden energy.
10. power supply changeover device control method as claimed in claim 9 wherein also comprises afterwards in step (f):
(g), when this overvoltage protective unit detects this output voltage and is an operating voltage, when this trigger control unit finished in the work period of this pulse width modulation signal, this Trig control signal of output high level, with this driver element of activation.
11. power supply changeover device control method as claimed in claim 10, wherein this trigger control unit comprises:
One positive edge triggers D flip-flop, comprises a data input pin, a clock pulse input and at least one output; And
One NOR gate, comprise two inputs and an output, and this output connects this clock pulse input;
Wherein, this data input pin receives this output voltage signal; This of this NOR gate two inputs receive respectively this pulse width modulation signal.
12. power supply changeover device control method as claimed in claim 11, wherein working as this output voltage is this overvoltage, and, when this pulse width modulation signal is all low level, this positive edge triggers this Trig control signal of D flip-flop output low level, with this driver element of forbidden energy.
13. power supply changeover device control method as claimed in claim 11, wherein working as this output voltage is this operating voltage, and, when this pulse width modulation signal is all low level, this positive edge triggers this Trig control signal of D flip-flop output high level, with this driver element of activation.
14. power supply changeover device control method as claimed in claim 9, wherein this overvoltage protective unit, by an optical coupling unit, is sent to this trigger control unit by this output voltage signal.
15. power supply changeover device control method as claimed in claim 11, wherein this full-bridge type commutation circuit comprises two brachium pontis that four power switch components form; The complementary conducting of this two brachium pontis prevents the time with cut-off interval one short circuit; When this output voltage is this overvoltage, and this short circuit time that prevents while occurring, this positive edge triggers this Trig control signal of D flip-flop output low level, with this driver element of forbidden energy.
16. power supply changeover device control method as claimed in claim 11, wherein this full-bridge type commutation circuit comprises two brachium pontis that four power switch components form; The complementary conducting of this two brachium pontis prevents the time with cut-off interval one short circuit; When this output voltage is this operating voltage, and this short circuit time that prevents while occurring, this positive edge triggers this Trig control signal of D flip-flop output high level, with this driver element of activation.
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| TWI746294B (en) * | 2020-11-27 | 2021-11-11 | 宏碁股份有限公司 | Power supply device with low loss |
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