CN1801589A - Direct-current power supply device and method for adjusting output power thereof - Google Patents
Direct-current power supply device and method for adjusting output power thereof Download PDFInfo
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Abstract
The invention relates to the field of direct-current power supply devices, in particular to a direct-current power supply device with power factor correction capability and a method for adjusting output power of the direct-current power supply device. A direct current power supply device comprises an alternating current power supply, a rectification circuit, a filter capacitor connected to a direct current output end of the rectification circuit, a reactor connected between the alternating current power supply and an alternating current input end of the rectification circuit, a short circuit for forcibly electrifying the reactor, a zero-crossing detection link, a grid driving link, a Vdc detection link for detecting a voltage value of a direct current output end of the rectification circuit, a voltage division network of the Vdc detection link, a sine wave reference signal generator for generating a sine wave reference signal, a triangular wave oscillator for generating a triangular wave signal, a comparison link and a control chip. The invention relates to a direct current power supply device, which forcibly causes a reactor and an alternating current power supply to be short-circuited and electrified within a specified time, thereby improving the power factor of a circuit and reducing higher harmonics of the power supply.
Description
[technical field]
The present invention relates to the continuous-current plant field, relate in particular to a kind of method that possesses the continuous-current plant of power factor correction ability and regulate power output.
[background technology]
Be applied in the continuous-current plant on the air conditioner at present, most modes that adopt bridge rectifier to add filter capacitor.The ac signal that AC power is produced converts dc signal to, and then by subsequent conditioning circuit this dc signal is converted to pulse-width modulation (PWM) signal of telecommunication, and the PWM signal of telecommunication is offered the frequency converter major loop that drives cooler compressor.See also illustrated in figures 1 and 2ly, under the situation that does not have filter capacitor C, obtain waveform behind the alternating current Va input bridge rectifier as Vb.After the energy storage effect through the filtering capacitor C, obtain approximate galvanic current and press Vc, observe period A (dash area) Vc=Vb on the Vc waveform, this represents that promptly Vb has current direction Vc, simultaneously capacitor C is charged to maintain voltage, so Vb has electric current j to flow to electric capacity and load, Va also has electric current ι simultaneously.And enter period B, and Vc voltage is owing to there is electric capacity to keep, and beginning is near crest voltage, and the consumed power because of load has slow downward trend subsequently, but the Vc voltage of this moment still is higher than Vb, so the electric current j=0 of period Vb, electric current ι=0 of relative Va.Hence one can see that, the power supply that Va is ordered only just has electric current at period A, so current waveform is narrow pulse type, causes increasing, and can bring other harm to the high order harmonic component of mains side electric leakage: the one, load increases the weight of, because the essential power that improves of input, and when period B electric current j=0, therefore at period A, the peak value of electric current ι must increase, this just requires the anti-flow valuve of rectifier cell also to want corresponding increase, makes circuit cost also increase thereupon; The 2nd, capacitor C strengthens, and capacitance discharges speed slows down, and period A shortens period B thereupon increasing, and the peak value of obvious electric current must increase could satisfy the constant requirement of power.
In order to prevent this situation, normally on input circuit, connect reactor, can improve the power factor of power supply with this, reduce the high order harmonic component of power supply simultaneously.But the effect that adopts this method to improve power factor is limited, if further improve power factor, reduces the high order harmonic component of power supply, just needs the more reactor of big inductance quantity, and this has just brought huge, the costly problem of whole device volume.And, therefore can only in some power interval, obtain power factor correction effect preferably because the inductance value of reactor just can not change after determining, the power factor in other power interval just can't be guaranteed.Even more serious is adopt reactor than big inductance quantity after, fall behind much from the current phase of power supply input, the voltage drop of direct current output becomes big, the peak power output of whole device will be restricted.
[summary of the invention]
The object of the present invention is to provide a kind of continuous-current plant that can either improve electrical source power factor.
Another object of the present invention is to provide a kind of continuous-current plant that can regulate power output.
A further object of the present invention is to provide a kind of above-mentioned continuous-current plant to regulate the method for power output.
For achieving the above object, the present invention adopts following technical scheme:
A kind of continuous-current plant, comprise AC power, the rectification circuit that the alternating current that AC power is exported carries out rectification, be connected the filter capacitor of rectification circuit dc output end, be connected the reactor between AC power and the rectification circuit ac input end, with the AC power short circuit, force the short circuit current that reactor is switched on, detect the zero passage detection link of ac power frequency and AC supply voltage zero crossing, the gate driving link, the Vdc that detects described rectification circuit dc output end magnitude of voltage detects link, above-mentioned Vdc detects the potential-divider network of link, produce the triangular wave oscillator of amplitude-controlled triangular signal, produce the sinusoidal reference signal generator of sinusoidal reference signal, the comparing element that the sine wave signal that the sinusoidal reference signal generator is produced and the triangular signal that triangular wave oscillator produces compare be connected the zero passage detection link, gate driving link and Vdc detect the control chip of link.
Described short circuit current comprises a power switch component and two diodes, and the collector electrode of power switch component is connected with the negative electrode of two diodes.
Described rectification circuit is a bridge rectifier, and the common anode of bridge rectifier connects the emitter of device for power switching, and the negative electrode of diode connects the collector electrode of device for power switching, and filter capacitor E1 is connected on the common cathode of bridge rectifier together between the anode.
Described control chip can be digital signal processor or single-chip microcomputer.
Described power switch component can be igbt, gate level turn-off thyristor or field-effect transistor.
The total inductance amount of described reactor is chosen between 10mH～20mH, and with two or three reactor series connection, the inductance value of described reactor equates.
Described continuous-current plant comprises that also an over-current detection link is connected with control chip.
The described continuous-current plant that comprises comprises that also a buffer protection circuit is in parallel with the power switch component two ends.
Described buffer protection circuit comprises an electric capacity.
Described buffer protection circuit also comprises the resistance with above-mentioned capacitances in series.
Described buffer protection circuit also comprises one and above-mentioned resistance diode connected in parallel.
Described continuous-current plant comprises that also an over-current detection link is connected with control chip.
The mode that described over-current detection link can take on device for power switching series resistance or current transformer to come the detected set electrode current also can take to detect the mode of collector emitter saturation voltage VCE (sat).
A kind of method of regulating the continuous-current plant power output comprises:
The first step: control chip is regulated, set limits value of duty ratio of PWM;
Second step: when motor rotation, the duty ratio of actual pwm signal is less than limits value, this moment can power supply mode of operation be set to the power factor mode of priority, to obtain the power factor correction effect is that preferential purpose is set pulse-triggered Δ t (or Δ t1 constantly, Δ t2, Δ t3 ...) and pulse duration Δ T (or Δ T1, Δ T2, Δ T3 ...);
The 3rd step: when actual PWM duty ratio exceeds default limits value, the mode of operation of power supply is set to the peak power output mode of priority, is that preferential purpose is provided with pulse-triggered constantly and pulse duration with the magnitude of voltage Vdc that improves dc output end.
Described dc voltage value detects link by Vdc and detects, and can cooperate control chip to carry out closed-loop adjustment, by the value of regulating Vdc the duty ratio of pwm signal is reduced to below the default limits value.
Compared with prior art, continuous-current plant of the present invention makes reactor and AC power short circuit energising by enforceable in official hour, thereby improves the current waveform that exchanges input, improves the power factor of circuit, reduce the high order harmonic component of power supply, obtain power factor correction effect preferably.By adopting the circuit structure of boost type (Boost), therefore possesses the ability of regulating output dc voltage value and power in addition.
[description of drawings]
Fig. 1 is a prior art bridge rectifier schematic diagram;
Fig. 2 is the voltage and the current waveform figure of each node in Fig. 1 circuit;
Fig. 3 is the electrical block diagram of continuous-current plant pulse execution mode of the present invention;
Fig. 4 is the circuit diagram of three kinds of over-current detection link execution modes;
Fig. 5 is the surge voltage oscillogram of device for power switching;
Fig. 6 is the schematic diagram of three kinds of device for power switching buffer protection circuit;
Fig. 7 is the function analysis curve chart of RCD buffer circuit;
Fig. 8 is after adopting the RCD buffer circuit, the load curve figure when device for power switching turn-offs;
Fig. 9 is the schematic diagram of the partial circuit course of work of continuous-current plant of the present invention;
Figure 10 is the electrical block diagram of continuous-current plant multiple-pulse execution mode of the present invention;
Figure 11 is under the continuous-current plant multiple-pulse execution mode of the present invention, the schematic diagram of triangular signal and sinusoidal reference signal and AC-input voltage signal phase relation;
Figure 12 is the schematic diagram of the pulse signal that compensated under the continuous-current plant multiple-pulse execution mode of the present invention;
Figure 13 is the source current waveform schematic diagram under the continuous-current plant multiple-pulse execution mode of the present invention.
[embodiment]
Introduce content of the present invention for convenience of explanation, below the applicant by introducing the method that the application of continuous-current plant in air-conditioning system illustrates continuous-current plant and regulate power output.
See also shown in Figure 3, continuous-current plant of the present invention comprises AC power Vin, the rectification circuit that the alternating current that AC power is exported carries out rectification, be connected the filter capacitor E1 of rectification circuit dc output end, be connected the reactor L between AC power Vin and the rectification circuit ac input end, with the AC power short circuit, force the short circuit current that reactor is switched on, detect the zero passage detection link of ac power frequency and AC supply voltage zero crossing, the gate driving link, the Vdc that detects rectification circuit dc output end magnitude of voltage detects link, the potential-divider network A ' that above-mentioned Vdc detects link and filter capacitor E1 parallel connection be connected the zero passage detection link, gate driving link and Vdc detect the control chip of link.In the present embodiment, rectification circuit is to utilize bridge rectifier.Short circuit current comprises a power switch component G1 and two diode D5, D6.
Reactor L, diode D5, D6, filter capacitor E1 and device for power switching G1 have constituted the boost type translation circuit.In the present embodiment, device for power switching G1 is an insulated gate bipolar transistor IGBT, and device for power switching G1 also can be gate level turn-off thyristor GTO or power field effect transistor MOSFET certainly.
The common anode of bridge rectifier connects the emitter of device for power switching G1, and the common cathode of diode D5, D6 connects the collector electrode of device for power switching G1, and filter capacitor E1 is connected on the common cathode of bridge rectifier together between the anode.Vdc detects the potential-divider network A ' of link and the two ends that power driving circuit is connected in parallel on output filter capacitor E1.
For the situation of avoiding causing circuit devcie to damage owing to the pulse duration of compensation is wide takes place; can be by the abnormal current signal of the real-time detection power switching device of over-current detection link collector electrode; when the abnormal current signal occurring; by the shutoff operation of control chip execution, to reach the purpose of protection device for power switching to device for power switching G1.Fig. 4 has provided the specific implementation of three kinds of over-current detection links, wherein (a) mode is that series connection detects the mode that resistance comes the detected set electrode current on device for power switching, detected current signal compares by comparator and the limits value of presetting, when exceeding default limits value, comparator is to control chip input abnormal current signal, and above-mentioned comparator is integrated in the control chip; (b) mode is a current transformer to be replaced detection resistance come collector current is detected, detected current signal compares by comparator and the limits value of presetting, when exceeding default limits value, comparator is to control chip input abnormal current signal, and above-mentioned comparator is integrated in the control chip; (c) mode is to come indirect detection abnormal current signal by the mode that detects collector emitter saturation voltage VCE (sat): because VCE (sat)=Ic * RCE (sat), when Ic increases, VCE (sat) also increases thereupon, if grid voltage is a high level, and VCE is high, just have overcurrent condition to take place in this case, this moment and door output high level are to control chip input abnormal current signal.
See also shown in Figure 5, because the existence of distributed inductance in the circuit, when the switching speed of device for power switching reaches KHz when above, when device for power switching turn-offs and with it and during the reverse recovery diodes backward recovery that connects, will produce surge voltage Ldi/dt, threaten the safety of device for power switching.Vce is the voltage waveform between device for power switching collector electrode-emitter among the figure; Ic is the collector current of device for power switching; Ud is the direct voltage of input power switch device; VCESP=UCE+Ldic/dt is the surge voltage peak value.If VCESP exceeds withstand voltage VCES between the collector electrode-emitter of device for power switching, will damage device for power switching.Therefore can the reload buffer protective circuit, suppress voltage build-up rate du/dt and current-rising-rate di/dt.
See also shown in Figure 6ly, wherein (a) is the C buffer circuit, adopts thin-film capacitor Cs; (b) be the RC buffer circuit, on the basis of C buffer circuit, increase a resistance R s who connects with thin-film capacitor Cs; (c) be the RCD buffer circuit, on the basis of RC buffer circuit, increase by one and resistance R s diode connected in parallel Ds.
In the present embodiment, continuous-current plant of the present invention is to adopt the RCD buffer circuit.See also shown in Figure 7ly, when not adding buffer circuit, electric current rises rapidly when device for power switching G1 conducting, and di/dt is very big; Du/dt is very big when G1 turn-offs, and very high surge voltage occurs.After having increased buffer circuit, during the G1 conducting: Cs discharges to G1 by Rs, and ic is stepped to a new level earlier, and owing to the influence of front end inductance, the ic rate of climb slows down afterwards; When G1 turn-offed, load current was shunted to Cs by Ds, had alleviated the burden of G1, had suppressed du/dt and too high surge voltage.See also shown in Figure 8ly, during no buffer circuit, Uce rises rapidly, and the L induced voltage makes the Ds conducting, and load curve moves to the B section from the A section, and ic just drops to the size of leakage current afterwards, and load curve moves to the C section thereupon; When buffer circuit was arranged, Cs shunting just descended ic when UCE begins to rise, and load curve arrives the C section through the D section, and load curve ADC is safer reliable, and process all is the zone of little electric current or small voltage, and its turn-off power loss also reduces greatly.
Control chip can be digital signal processor (DSP), also can be single-chip microcomputer.Control chip detects the frequency of alternating current input power supplying and the phase place of AC-input voltage by the zero passage detection link, detect the magnitude of voltage that link detects dc output end by Vdc, whether the collector electrode by over-current detection link detection power switching device exists unusual over-current signal, and according to above detection information, by gate driving link output pulse signal, by the motor driven link to the power driving circuit output pwm signal, this power driving circuit is by means of the break-make control to group of switching elements, with the dc voltage conversion of this continuous-current plant output is pulse width modulation (PulseWidth Modulation) voltage, drives the cooler compressor motor and carries out work.
Continuous-current plant of the present invention is worked as follows, at first detect the zero crossing of AC supply voltage by the zero passage detection link, after obtaining the moment of a plurality of zero crossings, calculate the difference of adjacent two zero crossings between the moment by control chip, judge the output frequency (for example: 50Hz or 60Hz) of AC power with this, and this supply frequency value is stored in the control chip as known quantity, as after pulse controlled basis.
By the zero passage detection link AC-input voltage is carried out zero passage detection afterwards, after detecting alternating voltage zero-crossing point, after control chip postpones 1ms, by gate driving link output pulse signal, triggering is to the conducting operation of device for power switching G1, make AC power carry out the short circuit operation, force to give reactor L charging by reactor L.After postponing 1ms, switch-off power switching device G1, and by reactor L afterflow.So move in circles,,, suppress the purpose of power high-order harmonic generation to reach the power factor that increases power supply with the angle of flow of this input source current of increasing exchanges.In the present embodiment, be 1ms time of delay, and need adjust above-mentioned time of delay according to the situation of supply frequency and power output, and power output is high more, and the charging interval that needs is long more.For example supply frequency is 50Hz, and according to the difference of power output, can select between 0.7ms～2.5ms time of delay.
See also shown in Figure 9, provided the compensation a certain power-factor improvement pulse process in, the course of work of partial circuit: the positive half cycle with input supply voltage is an example.A represents the device for power switching G1 conducting of boost type translation circuit, and this moment, power supply charged to reactor L, and the electric current among the reactor L increases gradually, and electric current is by diode D5, device for power switching G1 and diode D3 circulation; B represents that the device for power switching G1 of boost type translation circuit turn-offs, and this moment, reactor L was a circuit supply, and the electric current among this stage reactor L reduces gradually, and electric current is by diode D2 and diode D3 circulation; C represents that the device for power switching G1 of boost type translation circuit still turn-offs, and reduces to after zero when the electric current among the reactor L, is continued to power to the load by electric capacity E1.
In the present embodiment, employing is the air conditioner continuous-current plant of pulse.The total inductance amount of reactor is chosen between 10mH～20mH is advisable.In order to reduce noise, the reactor that can choose a plurality of small electric sensibility reciprocals is connected and is replaced one than the big inductance quantity reactor.For example, can select the reactor series connection of two 8mH small inductor amounts, perhaps select the reactor series connection of three 5.5mH small inductor amounts, substitute the reactor of the big inductance quantity of a 16mH.Preferably select the identical reactor of inductance value, the number of reactor is advisable with two or three.
Shown in Figure 10 is another execution mode of continuous-current plant of the present invention, promptly adopts multipulse execution mode to carry out power factor correction.In the present embodiment, the comparing element that the sine wave signal that continuous-current plant comprises triangular wave oscillator, sinusoidal reference signal generator and triangular signal that triangular wave oscillator is produced and sinusoidal reference signal generator produce compares, other elements are identical with first execution mode, so do not give unnecessary details.
According to the AC supply voltage phase place that the zero passage detection link records, the sinusoidal reference signal generator produces a series of and AC power same-phase, and frequency is 2 times of ac power frequencies, for example the positive axis sine wave signal of 100Hz or 120Hz.Triangular wave oscillator adjustable triangular signal of a series of amplitudes of generation in the 0～pi/2 phase in each AC power cycle and π～3 pi/2 phases interval simultaneously, the frequency of triangular signal can be come concrete the setting as required, for example may be selected to be and produce 10 triangular signals in every pi/2 phase interval.Afterwards the triangular signal that produces and sinusoidal reference signal are sent in the comparator and compared,, produce a series of pwm signals by gate driving link driving power switching device G1, power supply is carried out the short circuit operation by control chip according to comparative result.
See also shown in Figure 11, sinusoidal reference signal and ac voltage signal same-phase.The situation that figure (a)～(d) expression load current increases successively.Triangular wave oscillator only produces the adjustable triangular signal of a series of amplitudes in the 0～pi/2 phase in each cycle of alternating voltage and π～3 pi/2 phases interval, as can be seen, when load current increased, the amplitude of triangular signal is increase thereupon also.Sinusoidal reference signal is designated as VSine, and triangular signal is designated as VTria, and two signals are sent in the comparator compares, and when VTria＞VSine, the signal of output is set at conducting state " 1 " with device for power switching G1; When VSine＞VTria, the signal of output is set at off state " 0 " with device for power switching G1.See also shown in Figure 12ly, in the interval of each pi/2 phase, along with the increase gradually at phase angle, the pulse duration of compensation reduces gradually; And along with the increase gradually of load current, the overall width of institute's compensated pulse also increases gradually.
Under the equal conditions, in the multiple-pulse execution mode, if the inductance value of selecting reactor is selected the inductance value of reactor less than the pulse execution mode, adopt the power factor of the continuous-current plant of multiple-pulse execution mode can be so greater than the power factor of the continuous-current plant of the execution mode of pulse.For example in the execution mode of pulse, when selecting the reactor series connection of two 8mH, in the multipulse execution mode, can select the reactor of a 6mH.
See also shown in Figure 13, AC power for 220Vac/50Hz, adopt the 8mH reactor, the circuit of 1000 μ F filter capacitors, adopt above-mentioned multipulse execution mode, the compare current waveform of pulse execution mode, the angle of flow of the electric current of multiple-pulse execution mode further increases, and current waveform more approaches sine wave.In the application of reality, adopt the power factor of the air conditioner continuous-current plant of above-mentioned multiple-pulse execution mode can be greater than 0.98, total harmonic distortion (THD) is less than 20%, and the each harmonic current value all can satisfy the restriction of 3C/IEC standard.
No matter be the execution mode or the multipulse execution mode of pulse,, therefore all possess the ability of regulating the output dc voltage value owing to adopted the circuit structure of boost type (Boost).The method that a kind of VD value by the increase continuous-current plant improves the peak power output of air conditioner comprises the first step: control chip is regulated, set limits value of duty ratio of PWM; Second step: when motor rotation, the duty ratio of actual pwm signal is less than limits value, this moment can power supply mode of operation be set to the power factor mode of priority, to obtain the power factor correction effect is that preferential purpose is set pulse-triggered Δ t (or Δ t1 constantly, Δ t2, Δ t3 ...) and pulse duration Δ T (or Δ T1, Δ T2, Δ T3 ...); The 3rd step: when actual PWM duty ratio exceeds default limits value, the mode of operation of power supply is set to the peak power output mode of priority, is that preferential purpose is provided with pulse-triggered constantly and pulse duration with the magnitude of voltage Vdc that improves dc output end.Dc voltage value detects link by Vdc and detects, and can cooperate control chip to carry out closed-loop adjustment, by the value of regulating Vdc the duty ratio of pwm signal is reduced to below the default limits value.
The present invention has introduced continuous-current plant of using and the method for regulating power output thereof in air-conditioning system, this can not be considered to the restriction to claim of the present invention.If those skilled in the art has made change unsubstantiality, conspicuous or improvement according to the present invention, all should belong to the scope of claim protection of the present invention.
Claims (20)
1, a kind of continuous-current plant, comprise AC power, the rectification circuit that the alternating current that AC power is exported carries out rectification, be connected the filter capacitor of rectification circuit dc output end, be connected the reactor between AC power and the rectification circuit ac input end, it is characterized in that: described continuous-current plant also comprises the AC power short circuit, forces the short circuit current that reactor is switched on, detect the zero passage detection link of ac power frequency and AC supply voltage zero crossing, the gate driving link, the Vdc that detects described rectification circuit dc output end magnitude of voltage detects link, the potential-divider network that detects link with the Vdc of filter capacitor E1 parallel connection be connected the zero passage detection link, gate driving link and Vdc detect the control chip of link.
2, continuous-current plant according to claim 1 is characterized in that: described short circuit current comprises a power switch component and two diodes, and the collector electrode of power switch component is connected with the negative electrode of two diodes.
3, continuous-current plant according to claim 2, it is characterized in that: described rectification circuit is a bridge rectifier, the common anode of bridge rectifier connects the emitter of device for power switching, the negative electrode of diode connects the collector electrode of device for power switching, and filter capacitor E1 is connected on the common cathode of bridge rectifier together between the anode.
4, continuous-current plant according to claim 1 is characterized in that: described control chip can be digital signal processor or single-chip microcomputer.
5, continuous-current plant according to claim 2 is characterized in that: described power switch component can be igbt, gate level turn-off thyristor or field-effect transistor.
6, continuous-current plant according to claim 1 is characterized in that: the total inductance amount of described reactor is chosen between 10mH～20mH, with two or three reactor series connection.
7, continuous-current plant according to claim 6 is characterized in that: the inductance value of described reactor equates.
8, continuous-current plant according to claim 1 is characterized in that: described continuous-current plant comprises that also an over-current detection link is connected with control chip.
9, continuous-current plant according to claim 8, it is characterized in that: the mode that described over-current detection link adopts on device for power switching series resistance or current transformer to come the detected set electrode current, also can take to detect the mode of collector emitter saturation voltage VCE (sat).
10, continuous-current plant according to claim 2 is characterized in that: the described continuous-current plant that comprises comprises that also a buffer protection circuit is in parallel with the power switch component two ends.
11, continuous-current plant according to claim 10 is characterized in that: described buffer protection circuit comprises an electric capacity.
12, continuous-current plant according to claim 11 is characterized in that: described buffer protection circuit comprises the resistance with above-mentioned capacitances in series.
13, continuous-current plant according to claim 12 is characterized in that: described buffer protection circuit comprises one and above-mentioned resistance diode connected in parallel.
14, a kind of continuous-current plant, comprise AC power, the rectification circuit that the alternating current that AC power is exported carries out rectification, be connected the filter capacitor of rectification circuit dc output end, be connected the reactor between AC power and the rectification circuit ac input end, it is characterized in that: described continuous-current plant also comprises the AC power short circuit, forces the short circuit current that reactor is switched on, detect the zero passage detection link of ac power frequency and AC supply voltage zero crossing, the gate driving link, the Vdc that detects described rectification circuit dc output end magnitude of voltage detects link, supply voltage phase place according to described zero passage detection link detection, the potential-divider network in parallel with filter capacitor, produce the sinusoidal reference signal generator of sinusoidal reference signal, produce the triangular wave oscillator of triangular signal, the comparing element that the sine wave signal that the sinusoidal reference signal generator is produced and the triangular signal that triangular wave oscillator produces compare be connected the zero passage detection link, gate driving link and Vdc detect the control chip of link.
15, continuous-current plant according to claim 14 is characterized in that: described continuous-current plant comprises that also an over-current detection link is connected with control chip.
16, continuous-current plant according to claim 14 is characterized in that: described short circuit current comprises a power switch component and two diodes, and the collector electrode of power switch component is connected with the negative electrode of two diodes.
17, continuous-current plant according to claim 15, it is characterized in that: the mode that described over-current detection link can take on device for power switching series resistance or current transformer to come the detected set electrode current, also can take to detect the mode of collector emitter saturation voltage VCE (sat).
18, continuous-current plant according to claim 16 is characterized in that: the described continuous-current plant that comprises comprises that also a buffer protection circuit is connected with power switch component.
19, a kind of method according to each described continuous-current plant adjusting power output of claim 1-18 item comprises:
The first step: control chip is regulated, set limits value of duty ratio of PWM;
Second step: when motor rotation, the duty ratio of actual pwm signal is less than limits value, this moment can power supply mode of operation be set to the power factor mode of priority, to obtain the power factor correction effect is that preferential purpose is set pulse-triggered Δ t (or Δ t 1 constantly, Δ t2, Δ t3 ...) and pulse duration Δ T (or Δ T1, Δ T2, Δ T3 ...);
The 3rd step: when actual PWM duty ratio exceeds default limits value, the mode of operation of power supply is set to the peak power output mode of priority, is that preferential purpose is provided with pulse-triggered constantly and pulse duration with the magnitude of voltage Vdc that improves dc output end.
20, continuous-current plant according to claim 19 is regulated the method for power output, it is characterized in that: described dc voltage value detects link by Vdc and detects, can cooperate control chip to carry out closed-loop adjustment, the duty ratio of pwm signal be reduced to below the default limits value by the value of regulating Vdc.
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| CN101277059B (en) * | 2007-03-28 | 2010-11-10 | 松下电器产业株式会社 | Electric power transformation device |
| CN102201775A (en) * | 2010-03-26 | 2011-09-28 | 法雷奥电机设备公司 | Device for regulating rotary electrical machine of automobile and motor including the regulation device |
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| CN102820695A (en) * | 2012-09-07 | 2012-12-12 | 成都富强电子电器科技有限公司 | Emergency power supply system special for intelligent energy-saving fire control emergency lamp |
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| CN102549899A (en) * | 2009-08-10 | 2012-07-04 | 艾默生环境优化技术有限公司 | System and method for reducing line current distortion |
| CN102549899B (en) * | 2009-08-10 | 2014-11-26 | 艾默生环境优化技术有限公司 | System and method for reducing line current distortion |
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| CN102820695B (en) * | 2012-09-07 | 2015-03-11 | 成都富强电子电器科技有限公司 | Emergency power supply system special for intelligent energy-saving fire control emergency lamp |
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| CN103973134B (en) * | 2013-01-30 | 2016-09-07 | 广东美的制冷设备有限公司 | Continuous-current plant and improve the pwm pulse control method of its power factor |
| CN104506038A (en) * | 2015-01-21 | 2015-04-08 | 哈尔滨工业大学 | Optical coupling detection based Buck convertor soft-switching control method |
| CN104506038B (en) * | 2015-01-21 | 2017-02-22 | 哈尔滨工业大学 | Optical coupling detection based Buck convertor soft-switching control method |
| WO2016192160A1 (en) * | 2015-05-29 | 2016-12-08 | 广东美的制冷设备有限公司 | Device and method for protecting voltage surge of pec circuit in variable-frequency household electric apparatus |
| CN105006956A (en) * | 2015-06-24 | 2015-10-28 | 珠海格力电器股份有限公司 | Rectifying and filtering circuit and electric appliance |
| CN105006956B (en) * | 2015-06-24 | 2018-06-19 | 珠海格力电器股份有限公司 | Rectifying and filtering circuit and electric appliance |
| CN109936202A (en) * | 2017-12-18 | 2019-06-25 | 奥克斯空调股份有限公司 | A kind of air-conditioning charging circuit, charge control method and air-conditioning with the circuit |
| CN111725951A (en) * | 2019-03-20 | 2020-09-29 | 丰田自动车株式会社 | Motor system |
| CN111725951B (en) * | 2019-03-20 | 2022-10-18 | 株式会社电装 | Motor system |
| CN110417251A (en) * | 2019-07-09 | 2019-11-05 | 广东美的制冷设备有限公司 | Pfc circuit and air conditioner |
| CN112540219A (en) * | 2020-11-13 | 2021-03-23 | 珠海格力电器股份有限公司 | Zero-crossing detection circuit and control circuit |
| CN113691173A (en) * | 2021-07-23 | 2021-11-23 | 江苏东成工具科技有限公司 | Current control method |
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