CN104242645A - Method and device for controlling step-down circuits - Google Patents
Method and device for controlling step-down circuits Download PDFInfo
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- CN104242645A CN104242645A CN201410538152.7A CN201410538152A CN104242645A CN 104242645 A CN104242645 A CN 104242645A CN 201410538152 A CN201410538152 A CN 201410538152A CN 104242645 A CN104242645 A CN 104242645A
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention provides a method and a device for controlling step-down circuits. The method includes converting states of switch tubes of step-down type conversion circuits into normally open states under the control when working state conversion is carried out on bypass circuits by the step-down type conversion circuits, keeping the switch tubes of the step-down type conversion circuits in the normally open states for first preset time, then converting the states of the switch tubes into shutdown states, and converting states of switch tubes of the bypass circuits into normally open states under the control when the switch tubes of the step-down type conversion circuits keep in the normally open states; converting the states of the switch tubes of the step-down type conversion circuits into the normally open states under the control when working state conversion is carried out on the step-down type conversion circuits by the bypass circuits, keeping the switch tubes of the step-down type conversion circuits in the normally open states for second preset time, then converting the states of the switch tubes of the step-down type conversion circuits into PWM (pulse width modulation) working states, and converting the states of the switch tubes of the bypass circuits into shutdown states under the control when the switch tubes of the step-down type conversion circuits keep in the normally open states. The method and the device have the advantage that working states can be converted between the step-down type conversion circuits and the bypass circuits by the aid of the method and the device under the condition of low voltage and power fluctuation.
Description
Technical field
The present invention relates to combining inverter field, especially relate to a kind of control method and device of reduction voltage circuit.
Background technology
In the fields such as photovoltaic generation, combining inverter adopts DC/DC converter and DC/AC converter two-layer configuration usually, wherein DC/DC converter completes the conversion of direct voltage, and the DC conversion that DC/DC converter exports is the alternating current of required frequency by DC/AC converter.Wherein DC/DC converter can adopt boost type translation circuit, Buck conversion circuit or possess the translation circuit of boosting, buck functionality simultaneously, and in order to raise the efficiency, band bypass structure selected usually by DC/DC converter, namely jointly forms reduction voltage circuit with bypass circuit in parallel.
In practical work process, between Buck conversion circuit and bypass circuit, according to the actual requirements, can constantly carry out the conversion of operating state.But, in prior art when this operating state conversion, easily cause input side voltage or power fluctuation.Such as, in Fig. 1, switching tube S1, diode D and inductance L form Buck circuit, switching tube S2 forms bypass circuit, when carrying out operating state conversion by Buck circuit to bypass circuit, while control switch pipe S1 is in off state, control switch pipe S2 is in normal open state, because the output voltage (i.e. the voltage at electric capacity C1 two ends) of DC power supply is usually above busbar voltage (i.e. the voltage at electric capacity C2 two ends), the transient current flowing through switching tube S2 can be caused larger, and then cause the output voltage of DC power supply to produce larger fluctuation.And when carrying out operating state conversion by bypass circuit to Buck circuit, control switch pipe S1 is in PWM operating state while control switch pipe S2 is in off state, transfer process also can be caused steady, cause output-power fluctuation.
Summary of the invention
The technical problem that the present invention solves is the control method and the device that provide a kind of reduction voltage circuit, completes operating state conversion between Buck conversion circuit and bypass circuit smaller to realize voltage and power fluctuation.
For this reason, the technical scheme of technical solution problem of the present invention is:
The invention provides a kind of control method of reduction voltage circuit, described reduction voltage circuit comprises Buck conversion circuit in parallel and bypass circuit; Described method comprises:
When carrying out operating state conversion by described Buck conversion circuit to described bypass circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from PWM operating state, and be converted to off state after keeping normal open state first Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state;
When carrying out operating state conversion by described bypass circuit to described Buck conversion circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from off state, and be converted to PWM operating state after keeping normal open state second Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
Preferably, when described switching tube in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state, comprising:
After switching tube in described Buck conversion circuit is converted to normal open state, and any instant before being converted to off state, the switching tube controlled in described bypass circuit is converted to normal open state from off state;
When described switching tube in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state, comprising:
After switching tube in described Buck conversion circuit is converted to normal open state, and be converted to any instant before PWM operating state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
Preferably, described method also comprises: when described reduction voltage circuit is in running status, the input voltage of Buck conversion circuit described in Real-time Collection, judge described Buck conversion circuit and described bypass circuit whether in running order;
If described Buck conversion circuit is in running order, target setting output voltage is first threshold voltage, if and judge that the described input voltage of Real-time Collection is less than described first threshold voltage, carry out operating state by described Buck conversion circuit to described bypass circuit and change and set described target output voltage into Second Threshold voltage;
If described bypass circuit is in running order, setting described target output voltage is described Second Threshold voltage, if and judge that the described input voltage of Real-time Collection is greater than described Second Threshold voltage, carry out operating state by described bypass circuit to described Buck conversion circuit and change and set described target output voltage into described first threshold voltage;
Wherein, described first threshold voltage is less than described Second Threshold voltage.
Preferably, described method also comprises: when described Buck conversion circuit is in power-up state, gather the input voltage of described Buck conversion circuit, the input voltage of described Buck conversion circuit and expection output voltage is compared;
If the input voltage of described Buck conversion circuit is less than described expection output voltage, target setting output voltage is the input voltage of described Buck conversion circuit, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals the input voltage of described Buck conversion circuit, the switching tube now controlling described Buck conversion circuit is converted to off state from PWM operating state, and the switching tube controlling described bypass circuit is converted to conducting state from off state;
If the input voltage of described Buck conversion circuit is greater than described expection output voltage, target setting output voltage is described expection output voltage, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals described expection output voltage, the switching tube now controlling described Buck conversion circuit keeps PWM operating state.
Preferably, described bypass circuit comprises the switching tube with anti-paralleled diode.
Present invention also offers a kind of control device of reduction voltage circuit, described reduction voltage circuit comprises Buck conversion circuit in parallel and bypass circuit; Described control device comprises:
First control unit, during for carrying out operating state conversion by described Buck conversion circuit to described bypass circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from PWM operating state, and be converted to off state after keeping normal open state first Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state;
Second control unit, during for carrying out operating state conversion by described bypass circuit to described Buck conversion circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from off state, and be converted to PWM operating state after keeping normal open state second Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
Preferably, when the described first control unit switching tube be used in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state, comprising:
After the described first control unit switching tube be used in described Buck conversion circuit is converted to normal open state, and any instant before being converted to off state, the switching tube controlled in described bypass circuit is converted to normal open state from off state;
When the described second control unit switching tube be used in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state, comprising:
After the described second control unit switching tube be used in described Buck conversion circuit is converted to normal open state, and be converted to any instant before PWM operating state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
Preferably, described device also comprises:
First judging unit, for when described reduction voltage circuit is in running status, the input voltage of Buck conversion circuit described in Real-time Collection, judge described Buck conversion circuit and described bypass circuit whether in running order;
If described Buck conversion circuit is in running order, target setting output voltage is first threshold voltage, if and judge that the described input voltage of Real-time Collection is less than described first threshold voltage, notify that described first control unit carries out operating state by described Buck conversion circuit to described bypass circuit and changes and set described target output voltage into Second Threshold voltage; And,
If described bypass circuit is in running order, setting described target output voltage is described Second Threshold voltage, if and judge that the described input voltage of Real-time Collection is greater than described Second Threshold voltage, notify that described second control unit carries out operating state by described bypass circuit to described Buck conversion circuit and changes and set described target output voltage into described first threshold voltage;
Wherein, described first threshold voltage is less than described Second Threshold voltage.
Preferably, described device also comprises:
Second judging unit, for when described Buck conversion circuit is in power-up state, gathers the input voltage of described Buck conversion circuit, the input voltage of described Buck conversion circuit and expection output voltage is compared;
If the input voltage of described Buck conversion circuit is less than described expection output voltage, target setting output voltage is the input voltage of described Buck conversion circuit, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals the input voltage of described Buck conversion circuit, the switching tube now controlling described Buck conversion circuit is converted to off state from PWM operating state, and the switching tube controlling described bypass circuit is converted to conducting state from off state; And,
If the input voltage of described Buck conversion circuit is greater than described expection output voltage, target setting output voltage is described expection output voltage, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals described expection output voltage, the switching tube now controlling described Buck conversion circuit keeps PWM operating state.
Preferably, described bypass circuit comprises the switching tube with anti-paralleled diode.
Known by technique scheme, when carrying out operating state conversion by Buck conversion circuit to bypass circuit in the embodiment of the present invention, be no longer switching tube immediately in controlled hypotension formula translation circuit be converted to off state and immediately the switching tube controlled in bypass circuit be converted to normal open state, but the switching tube in controlled hypotension formula translation circuit is converted to off state after being converted to normal open state a period of time again, when switching tube in Buck conversion circuit remains normal open state, the switching tube controlled in bypass circuit is converted to normal open state, thus utilize Buck conversion circuit to suppress the quick rising of electric current, fluctuate to suppress output voltage.And when carrying out operating state conversion by bypass circuit to Buck conversion circuit, no longer that the switching tube controlled immediately in bypass circuit is converted to off state and the switching tube immediately in controlled hypotension formula translation circuit is converted to PWM operating state, but the switching tube in controlled hypotension formula translation circuit is converted to PWM operating state after being converted to normal open state a period of time again, when switching tube in Buck conversion circuit remains normal open state, the switching tube controlled in bypass circuit is converted to off state, thus the stable transition of guaranteed output.Therefore present invention achieves voltage and power fluctuation and complete operating state conversion between Buck conversion circuit and bypass circuit smaller.
Accompanying drawing explanation
Fig. 1 is a kind of physical circuit figure of the Buck conversion circuit with bypass;
Fig. 2 is the schematic flow sheet of a kind of embodiment of the method provided by the invention;
Fig. 3 is the control signal sequential chart of switching tube S1 and switching tube S2 when carrying out operating state conversion from Buck circuit to bypass circuit;
Fig. 4 is the control signal sequential chart of switching tube S1 and switching tube S2 when carrying out operating state conversion from bypass circuit to Buck circuit;
Fig. 5 is the schematic flow sheet of another kind of embodiment of the method provided by the invention;
Fig. 6 is the input voltage change procedure of low pressure Buck circuit when powering on;
Fig. 7 is the input voltage change procedure of high pressure Buck circuit when powering on;
The input voltage change procedure of Buck conversion circuit when Fig. 8 is running;
Fig. 9 is the structural representation of a kind of device embodiment provided by the invention.
Embodiment
In the fields such as photovoltaic generation, combining inverter adopts DC/DC converter and DC/AC converter two-layer configuration usually, wherein DC/DC converter completes the conversion of direct voltage, and the DC conversion that DC/DC converter exports is the alternating current of required frequency by DC/AC converter.Wherein DC/DC converter can adopt boost type translation circuit, Buck conversion circuit or possess the translation circuit of boosting, buck functionality simultaneously, and in order to raise the efficiency, band bypass structure selected usually by DC/DC converter, namely jointly forms reduction voltage circuit with bypass circuit in parallel.
In practical work process, between Buck conversion circuit and bypass circuit, according to the actual requirements, can constantly carry out the conversion of operating state.But, in prior art when this operating state conversion, easily cause input side voltage or power fluctuation.Such as in the decompression transducer of the band bypass shown in Fig. 1, be specially Buck circuit for Buck conversion circuit.Wherein be with switching tube S1, the diode D of anti-paralleled diode VD1 and inductance L to form Buck circuit, the switching tube S2 of band anti-paralleled diode VD2 forms bypass circuit.Wherein Buck circuit in parallel with bypass circuit after, be connected between DC power supply and DC/AC converter, the output also input capacitance C1 in parallel of DC power supply, to realize the effect of stable input voltage, the output also parallel connection direct bus capacitor C2 of Buck circuit.
In the circuit shown in Fig. 1, when carrying out operating state conversion by Buck circuit to bypass circuit, while control switch pipe S1 is in off state, control switch pipe S2 is in normal open state, because the output voltage (i.e. the voltage at electric capacity C1 two ends) of DC power supply is usually above busbar voltage (i.e. the voltage at electric capacity C2 two ends), the transient current flowing through switching tube S2 can be caused larger, and then cause the output voltage of DC power supply to produce larger fluctuation.And when carrying out operating state conversion by bypass circuit to Buck circuit, control switch pipe S1 is in PWM operating state while control switch pipe S2 is in off state, transfer process also can be caused steady, cause output-power fluctuation.
And in embodiments of the present invention, provide a kind of control method and device of reduction voltage circuit, complete operating state conversion between Buck conversion circuit and bypass circuit smaller to realize voltage and power fluctuation.
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those skilled in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 2, embodiments provide a kind of embodiment of the control method of reduction voltage circuit, in the present embodiment, reduction voltage circuit comprises Buck conversion circuit in parallel and bypass circuit; The control method of the present embodiment comprises:
S201: when carrying out operating state conversion by Buck conversion circuit to bypass circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from PWM operating state, and be converted to off state after keeping normal open state first Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state.
When Buck conversion circuit is in running order, the switching tube in Buck conversion circuit is in PWM operating state, namely by the switching tube work in pwm signal controlled hypotension formula translation circuit.For Fig. 1, namely switching tube S1 is in PWM operating state.
When needs carry out operating state conversion from Buck conversion circuit to bypass circuit, namely by Buck conversion circuit, in running order to switch to bypass circuit in running order, no longer that switching tube immediately in controlled hypotension formula translation circuit is converted to off state in the embodiment of the present invention, but the switching tube in controlled hypotension formula translation circuit is converted to off state after being converted to normal open state a period of time again, thus utilize Buck conversion circuit to suppress the quick rising of electric current, fluctuate to suppress output voltage.Wherein bypass circuit can comprise the switching tube of band anti-paralleled diode.Be illustrated for the circuit shown in Fig. 1 below.
As shown in Figure 3, T1 is the drive singal of switching tube S1, suppose in the t0 moment, need from Buck circuit that in running order to switch to bypass circuit in running order, then control switch pipe S1 is converted to normal open state and keeps a period of time, now inductance L can suppress the quick rising of electric current, the t1 moment again control switch pipe S1 be converted to off state.
Meanwhile, to the control of bypass circuit also without the need to being that the switching tube controlled immediately in bypass circuit is converted to normal open state, but when the switching tube in Buck conversion circuit remains normal open state, the switching tube controlled in bypass circuit is converted to conducting state.When switching tube wherein in Buck conversion circuit remains normal open state, the switching tube controlled in bypass circuit is converted to normal open state from off state, can comprise: after the switching tube in Buck conversion circuit is converted to normal open state, and any instant before being converted to off state, the switching tube controlled in bypass circuit is converted to normal open state from off state.Still be illustrated for the circuit shown in Fig. 1 below.
As shown in Figure 3, T2 is the drive singal of switching tube S2, and in the t0 moment, switching tube S1 is converted to normal open state, is converted to off state at t1 moment switching tube S1.And switching tube S2 only need after switching tube S1 be converted to normal open state, and any instant conducting before being converted to off state, i.e. the switching tube S2 any instant conducting that (can not comprise t0 moment and t1 moment) between the t0 moment to t1 moment in figure 3.
S202: when carrying out operating state conversion by described bypass circuit to described Buck conversion circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from off state, and be converted to PWM operating state after keeping normal open state second Preset Time, and when the switching tube in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
When bypass circuit is in running order, the switching tube in bypass circuit is in normal open state, is namely controlled the switching tube conducting always in bypass circuit by fixed level signal (such as high level).For Fig. 1, namely switching tube S2 is in normal open state.
When needs carry out operating state conversion from bypass circuit to Buck conversion circuit, namely by bypass circuit, in running order to switch to Buck conversion circuit in running order, no longer that switching tube immediately in controlled hypotension formula translation circuit is converted to PWM operating state in the embodiment of the present invention, but the switching tube in controlled hypotension formula translation circuit is converted to PWM operating state after being converted to normal open state a period of time again, thus the stable transition of guaranteed output.Be illustrated for the circuit shown in Fig. 1 below.
As shown in Figure 4, T1 is the drive singal of switching tube S1, suppose in the t2 moment, need from bypass circuit that in running order to switch to Buck circuit in running order, then control switch pipe S1 is converted to normal open state and keeps a period of time, and the t3 moment again control switch pipe S1 be converted to PWM operating state.
Meanwhile, to the control of bypass circuit also without the need to being that the switching tube controlled immediately in bypass circuit is converted to off state, but when the switching tube in Buck conversion circuit remains normal open state, the switching tube controlled in bypass circuit is converted to off state.When switching tube wherein in Buck conversion circuit remains normal open state, the switching tube controlled in bypass circuit is converted to off state from normal open state, can comprise: after the switching tube in Buck conversion circuit is converted to normal open state, and any instant be converted to before PWM operating state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.Still be illustrated for the circuit shown in Fig. 1 below.
As shown in Figure 4, T2 is the drive singal of switching tube S2, and in the t2 moment, switching tube S1 is converted to normal open state, is converted to PWM operating state at t3 moment switching tube S1.And switching tube S2 only need after switching tube S1 be converted to normal open state, and any instant be converted to before PWM operating state turns off, any instant that namely switching tube S2 (can not comprise t2 moment and t3 moment) between the t2 moment to t3 moment turns off.
It should be noted that, the step S201 in the embodiment of the present invention and the execution sequence of step S202 not circumscribed, specifically according to Buck conversion circuit and bypass circuit conversion requirements in the course of the work.In addition, be not also limited the first Preset Time and the second Preset Time in the embodiment of the present invention, both can be equal, also can be unequal.
Known by technique scheme, when carrying out operating state conversion by Buck conversion circuit to bypass circuit in the embodiment of the present invention, be no longer switching tube immediately in controlled hypotension formula translation circuit be converted to off state and immediately the switching tube controlled in bypass circuit be converted to normal open state, but the switching tube in controlled hypotension formula translation circuit is converted to off state after being converted to normal open state a period of time again, when switching tube in Buck conversion circuit remains normal open state, the switching tube controlled in bypass circuit is converted to normal open state, thus utilize Buck conversion circuit to suppress the quick rising of electric current, fluctuate to suppress output voltage.And when carrying out operating state conversion by bypass circuit to Buck conversion circuit, no longer that the switching tube controlled immediately in bypass circuit is converted to off state and the switching tube immediately in controlled hypotension formula translation circuit is converted to PWM operating state, but the switching tube in controlled hypotension formula translation circuit is converted to PWM operating state after being converted to normal open state a period of time again, when switching tube in Buck conversion circuit remains normal open state, the switching tube controlled in bypass circuit is converted to off state, thus the stable transition of guaranteed output.Thus achieve voltage and power fluctuation and complete operating state conversion between Buck conversion circuit and bypass circuit smaller.
At present, mostly be the research of the control mode to boost type translation circuit in prior art, and for Buck conversion circuit, prior art is seldom analyzed its control mode while powering on (comprise and the time of operation).Therefore, in a preferred embodiment below, a kind of control mode of the Buck conversion circuit to band bypass is provided, control mode when stressing when Buck conversion circuit powers on and be in running status.
Refer to Fig. 5, embodiments provide the another kind of embodiment of the control method of reduction voltage circuit, in the present embodiment, reduction voltage circuit comprises Buck conversion circuit in parallel and bypass circuit; The control method of the present embodiment comprises:
S501: when Buck conversion circuit is in power-up state, gathers the input voltage of Buck conversion circuit, the input voltage of Buck conversion circuit and expection output voltage is compared.If the input voltage of Buck conversion circuit is less than expection output voltage, perform S5021 to S5022, if the input voltage of Buck conversion circuit is greater than expection output voltage, perform S5031 to S5032.If the input voltage of Buck conversion circuit equals to expect both can perform output voltage S5021 to S5022, and also can perform S5031 to S5032.
The input voltage of Buck conversion circuit, the actual output voltage V being DC power supply (such as photovoltaic battery panel)
pv, the operating voltage range of DC power supply is V
pv1~ V
pv2, the output voltage of Buck conversion circuit, is actually busbar voltage V
bus, the working range of busbar voltage is V
bus1~ V
bus2, target output voltage V
bus-ref, i.e. bus command voltage, namely sends instruction with the target voltage making busbar voltage finally export to DC/AC converter or Buck conversion circuit, particularly, when power-up state, send instruction to Buck conversion circuit, when running status, send instruction to DC/AC converter.Wherein V
pv2>=V
bus2>=V
bus>=V
bus1.
Expection output voltage V
bus-set, refer to the voltage that Buck conversion circuit needs to export, generally set according to current demand etc. by user.
S5021: now the input voltage of Buck conversion circuit is less than expection output voltage, i.e. V
pv< V
bus-set, that is DC power supply can not provide the current required voltage exported, and therefore target setting output voltage is the input voltage of Buck conversion circuit, i.e. V
bus-ref=V
pv, controlled hypotension formula translation circuit is in running order until the output voltage of Buck conversion circuit equals the input voltage of Buck conversion circuit, i.e. V
bus=V
pv.
S5022: the input voltage equaling Buck conversion circuit at the output voltage of Buck conversion circuit, i.e. V
bus=V
pvtime, the switching tube of controlled hypotension formula translation circuit is converted to off state from PWM operating state, and the switching tube controlling bypass circuit is converted to conducting state from off state.Maintain busbar voltage V
bus=V
pvuntil running status.
Be illustrated for the circuit shown in Fig. 1, as shown in Figure 6, T1 is the drive singal of switching tube S1, and T2 is the drive singal of switching tube S2, and curve I, II represents the operating voltage range V of DC power supply
pv1~ V
pv2, curve III represents expection output voltage V
bus-set, curve IV represents the input voltage V of Buck circuit
pv, curve V represents the output voltage V of Buck circuit
bus.The t4 moment is the initial time powered on, and realizes V in the t5 moment
bus=V
pv.
S5031: now the input voltage of Buck conversion circuit is greater than expection output voltage, i.e. V
pv> V
bus-set, that is DC power supply can provide the current required voltage exported, and therefore target setting output voltage is expection output voltage, i.e. V
bus-ref=V
bus-set, controlled hypotension formula translation circuit is in running order until the output voltage of Buck conversion circuit equals to expect output voltage, i.e. V
bus=V
bus-set.
S5032: equal to expect output voltage, i.e. V at the output voltage of Buck conversion circuit
bus=V
bus-settime, the switching tube of controlled hypotension formula translation circuit keeps PWM operating state.The switching tube of bypass circuit keeps off state simultaneously, maintains busbar voltage V
bus=V
bus-setuntil running status.
Be illustrated for the circuit shown in Fig. 1, shown in Fig. 7, T1 is the drive singal of switching tube S1, and T2 is the drive singal of switching tube S2, and the t6 moment is the initial time powered on, and realizes V in the t7 moment
bus=V
pv.
Be illustrated for the circuit shown in Fig. 1, as shown in Figure 7, T1 is the drive singal of switching tube S1, and T2 is the drive singal of switching tube S2, and curve I, II represents the operating voltage range V of DC power supply
pv1~ V
pv2, curve III represents expection output voltage V
bus-set, curve IV represents the input voltage V of Buck conversion circuit
pv, curve V represents the output voltage V of Buck
bus.The T6 moment is the initial time powered on, and realizes V in the t7 moment
bus=V
bus-set.
S504: when reduction voltage circuit is in running status, the input voltage of Real-time Collection Buck conversion circuit, judge Buck conversion circuit and bypass circuit whether in running order; If Buck conversion circuit is in running order, perform S5051-S5052, if bypass circuit is in running order, perform S5061-S5062.
Can power stage be carried out after power-up state, namely enter running status.Because the output voltage of DC power supply constantly changes along with environmental change, therefore in order to reduce the frequent transitions of Buck conversion circuit and side circuit, in the present embodiment, be provided with the stagnant ring of threshold voltage: first threshold voltage V
chang1with Second Threshold voltage V
chang2, wherein first threshold voltage is less than Second Threshold voltage, in fact has V
bus1<V
chang1<V
chang2<V
bus2.
S5051: now Buck conversion circuit is in running order, target setting output voltage is first threshold voltage, i.e. V
bus-set=V
chang1if, and judge that the input voltage of the Buck conversion circuit of step S504 Real-time Collection is less than first threshold voltage, i.e. V
pv< V
chang1judged result for being time, perform S5052.Otherwise Buck conversion circuit keeps operating state.
S5052: carry out operating state conversion to bypass circuit by Buck conversion circuit, namely perform step S507, and target setting output voltage is Second Threshold voltage, i.e. V
bus-set=V
chang2.
S5061: now bypass circuit is in running order, target setting output voltage is Second Threshold voltage, i.e. V
bus-set=V
chang2if, and judge that the input voltage of the Buck conversion circuit of step S504 Real-time Collection is greater than Second Threshold voltage, i.e. V
pv> V
chang1judged result for being time, perform S5062.Otherwise bypass circuit keeps operating state.
S5062: carry out operating state conversion to Buck conversion circuit by bypass circuit, namely perform step S508, and target setting output voltage is first threshold voltage, i.e. V
bus-set=V
chang1.
In the visible embodiment of the present invention, the voltage hysteresis formed by first threshold voltage and Second Threshold voltage, achieves the frequent switching of the operating state reducing bypass circuit and Buck conversion circuit.Such as described in Fig. 8, curve I, II represents the first voltage threshold and the second voltage threshold respectively, and curve III represents in the t8 moment to the change curve of the input voltage of the Buck conversion circuit in t11 moment.In t8 to the t9 moment, bypass circuit is in running order, Buck conversion circuit does not work, when only having the input voltage when Buck conversion circuit to rise to Second Threshold voltage, in the i.e. t9 moment, carry out operating state conversion by bypass circuit to Buck conversion circuit, and when only having the input voltage when Buck conversion circuit to be down to first threshold voltage, in the i.e. t10 moment, carry out operating state conversion by Buck conversion circuit to bypass circuit.
In the embodiment of the present invention, the work schedule of reduction voltage circuit is divided into power-up state and running status.Wherein power-up state is busbar voltage process of establishing; Running status is the power stage process to DC/AC converter.
S507: when carrying out operating state conversion by Buck conversion circuit to bypass circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from PWM operating state, and be converted to off state after keeping normal open state first Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state.
S508: when carrying out operating state conversion by bypass circuit to Buck conversion circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from off state, and be converted to PWM operating state after keeping normal open state second Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
Embodiment of the method shown in corresponding diagram 2, refer to Fig. 9, present invention also offers a kind of embodiment of the control device of reduction voltage circuit, the reduction voltage circuit of the present embodiment comprises Buck conversion circuit in parallel and bypass circuit, and the control device of the present embodiment comprises: the first control unit 901 and the second control unit 902.
First control unit 901 for, when carrying out operating state conversion by Buck conversion circuit to bypass circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from PWM operating state, and be converted to off state after keeping normal open state first Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state.Wherein bypass circuit can comprise the switching tube of band anti-paralleled diode.
When wherein the first control unit 901 remains normal open state for the switching tube in Buck conversion circuit, the switching tube controlled in bypass circuit is converted to normal open state from off state, can comprise: after the first control unit 901 is converted to normal open state for the switching tube in Buck conversion circuit, and any instant before being converted to off state, the switching tube controlled in bypass circuit is converted to normal open state from off state.Be illustrated for the circuit shown in Fig. 1 below.
As shown in Figure 3, T1 is the drive singal of switching tube S1, T2 is the drive singal of switching tube S2, suppose in the t0 moment, need from Buck circuit that in running order to switch to bypass circuit in running order, then control switch pipe S1 is converted to normal open state and keeps a period of time, and now inductance L can suppress the quick rising of electric current, the t1 moment again control switch pipe S1 be converted to off state.And switching tube S2 only need after switching tube S1 be converted to normal open state, and any instant conducting before being converted to off state, i.e. the switching tube S2 any instant conducting that (t0 moment and t1 moment can be comprised) between the t0 moment to t1 moment in figure 3.
Second control unit 902 for, when carrying out operating state conversion by described bypass circuit to described Buck conversion circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from off state, and be converted to PWM operating state after keeping normal open state second Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
When wherein the second control unit 902 remains normal open state for the switching tube in Buck conversion circuit, the switching tube controlled in bypass circuit is converted to off state from normal open state, can comprise: after the second control unit 902 is converted to normal open state for the switching tube in Buck conversion circuit, and any instant be converted to before PWM operating state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.Be illustrated for the circuit shown in Fig. 1 below.
As shown in Figure 4, T1 is the drive singal of switching tube S1, T2 is the drive singal of switching tube S2, suppose in the t2 moment, need from bypass circuit that in running order to switch to Buck circuit in running order, then control switch pipe S1 is converted to normal open state and keeps a period of time, and the t3 moment again control switch pipe S1 be converted to PWM operating state.And switching tube S2 only need after switching tube S1 be converted to normal open state, and any instant be converted to before PWM operating state turns off, any instant that namely switching tube S2 (can not comprise t2 moment and t3 moment) between the t2 moment to t3 moment turns off.
Preferably, the device of the present embodiment can also comprise:
First judging unit, for when described reduction voltage circuit is in running status, the input voltage of Buck conversion circuit described in Real-time Collection, judge described Buck conversion circuit and described bypass circuit whether in running order;
If described Buck conversion circuit is in running order, target setting output voltage is first threshold voltage, if and judge that the described input voltage of Real-time Collection is less than described first threshold voltage, notify that described first control unit carries out operating state by described Buck conversion circuit to described bypass circuit and changes and set described target output voltage into Second Threshold voltage; And,
If described bypass circuit is in running order, setting described target output voltage is described Second Threshold voltage, if and judge that the described input voltage of Real-time Collection is greater than described Second Threshold voltage, notify that described second control unit carries out operating state by described bypass circuit to described Buck conversion circuit and changes and set described target output voltage into described first threshold voltage;
Wherein, described first threshold voltage is less than described Second Threshold voltage.
Preferably, the device of the present embodiment can also comprise:
Second judging unit, for when described Buck conversion circuit is in power-up state, gathers the input voltage of described Buck conversion circuit, the input voltage of described Buck conversion circuit and expection output voltage is compared;
If the input voltage of described Buck conversion circuit is less than described expection output voltage, target setting output voltage is the input voltage of described Buck conversion circuit, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals the input voltage of described Buck conversion circuit, the switching tube now controlling described Buck conversion circuit is converted to off state from PWM operating state, and the switching tube controlling described bypass circuit is converted to conducting state from off state; And,
If the input voltage of described Buck conversion circuit is greater than described expection output voltage, target setting output voltage is described expection output voltage, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals described expection output voltage, the switching tube now controlling described Buck conversion circuit keeps PWM operating state.
Device embodiment provided by the invention is corresponding with embodiment of the method, and therefore describe comparatively simple, relevant part refers to embodiment of the method.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. a control method for reduction voltage circuit, is characterized in that, described reduction voltage circuit comprises Buck conversion circuit in parallel and bypass circuit; Described method comprises:
When carrying out operating state conversion by described Buck conversion circuit to described bypass circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from PWM operating state, and be converted to off state after keeping normal open state first Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state;
When carrying out operating state conversion by described bypass circuit to described Buck conversion circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from off state, and be converted to PWM operating state after keeping normal open state second Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
2. method according to claim 1, is characterized in that, when described switching tube in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state, comprising:
After switching tube in described Buck conversion circuit is converted to normal open state, and any instant before being converted to off state, the switching tube controlled in described bypass circuit is converted to normal open state from off state;
When described switching tube in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state, comprising:
After switching tube in described Buck conversion circuit is converted to normal open state, and be converted to any instant before PWM operating state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
3. method according to claim 1, it is characterized in that, described method also comprises: when described reduction voltage circuit is in running status, the input voltage of Buck conversion circuit described in Real-time Collection, judge described Buck conversion circuit and described bypass circuit whether in running order;
If described Buck conversion circuit is in running order, target setting output voltage is first threshold voltage, if and judge that the described input voltage of Real-time Collection is less than described first threshold voltage, carry out operating state by described Buck conversion circuit to described bypass circuit and change and set described target output voltage into Second Threshold voltage;
If described bypass circuit is in running order, setting described target output voltage is described Second Threshold voltage, if and judge that the described input voltage of Real-time Collection is greater than described Second Threshold voltage, carry out operating state by described bypass circuit to described Buck conversion circuit and change and set described target output voltage into described first threshold voltage;
Wherein, described first threshold voltage is less than described Second Threshold voltage.
4. method according to claim 1, it is characterized in that, described method also comprises: when described Buck conversion circuit is in power-up state, gather the input voltage of described Buck conversion circuit, the input voltage of described Buck conversion circuit and expection output voltage is compared;
If the input voltage of described Buck conversion circuit is less than described expection output voltage, target setting output voltage is the input voltage of described Buck conversion circuit, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals the input voltage of described Buck conversion circuit, the switching tube now controlling described Buck conversion circuit is converted to off state from PWM operating state, and the switching tube controlling described bypass circuit is converted to conducting state from off state;
If the input voltage of described Buck conversion circuit is greater than described expection output voltage, target setting output voltage is described expection output voltage, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals described expection output voltage, the switching tube now controlling described Buck conversion circuit keeps PWM operating state.
5. method according to claim 1, is characterized in that, described bypass circuit comprises the switching tube with anti-paralleled diode.
6. a control device for reduction voltage circuit, is characterized in that, described reduction voltage circuit comprises Buck conversion circuit in parallel and bypass circuit; Described control device comprises:
First control unit, during for carrying out operating state conversion by described Buck conversion circuit to described bypass circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from PWM operating state, and be converted to off state after keeping normal open state first Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state;
Second control unit, during for carrying out operating state conversion by described bypass circuit to described Buck conversion circuit, the switching tube controlled in described Buck conversion circuit is converted to normal open state from off state, and be converted to PWM operating state after keeping normal open state second Preset Time, and the switching tube in described Buck conversion circuit is when remaining normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
7. device according to claim 6, it is characterized in that, when the described first control unit switching tube be used in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to normal open state from off state, comprising:
After the described first control unit switching tube be used in described Buck conversion circuit is converted to normal open state, and any instant before being converted to off state, the switching tube controlled in described bypass circuit is converted to normal open state from off state;
When the described second control unit switching tube be used in described Buck conversion circuit remains normal open state, the switching tube controlled in described bypass circuit is converted to off state from normal open state, comprising:
After the described second control unit switching tube be used in described Buck conversion circuit is converted to normal open state, and be converted to any instant before PWM operating state, the switching tube controlled in described bypass circuit is converted to off state from normal open state.
8. device according to claim 6, is characterized in that, described device also comprises:
First judging unit, for when described reduction voltage circuit is in running status, the input voltage of Buck conversion circuit described in Real-time Collection, judge described Buck conversion circuit and described bypass circuit whether in running order;
If described Buck conversion circuit is in running order, target setting output voltage is first threshold voltage, if and judge that the described input voltage of Real-time Collection is less than described first threshold voltage, notify that described first control unit carries out operating state by described Buck conversion circuit to described bypass circuit and changes and set described target output voltage into Second Threshold voltage; And,
If described bypass circuit is in running order, setting described target output voltage is described Second Threshold voltage, if and judge that the described input voltage of Real-time Collection is greater than described Second Threshold voltage, notify that described second control unit carries out operating state by described bypass circuit to described Buck conversion circuit and changes and set described target output voltage into described first threshold voltage;
Wherein, described first threshold voltage is less than described Second Threshold voltage.
9. device according to claim 6, is characterized in that, described device also comprises:
Second judging unit, for when described Buck conversion circuit is in power-up state, gathers the input voltage of described Buck conversion circuit, the input voltage of described Buck conversion circuit and expection output voltage is compared;
If the input voltage of described Buck conversion circuit is less than described expection output voltage, target setting output voltage is the input voltage of described Buck conversion circuit, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals the input voltage of described Buck conversion circuit, the switching tube now controlling described Buck conversion circuit is converted to off state from PWM operating state, and the switching tube controlling described bypass circuit is converted to conducting state from off state; And,
If the input voltage of described Buck conversion circuit is greater than described expection output voltage, target setting output voltage is described expection output voltage, control that described Buck conversion circuit is in running order until the output voltage of described Buck conversion circuit equals described expection output voltage, the switching tube now controlling described Buck conversion circuit keeps PWM operating state.
10. device according to claim 6, is characterized in that, described bypass circuit comprises the switching tube with anti-paralleled diode.
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