CN102315776B - Inverter power supply device - Google Patents
Inverter power supply device Download PDFInfo
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- CN102315776B CN102315776B CN201110170387.1A CN201110170387A CN102315776B CN 102315776 B CN102315776 B CN 102315776B CN 201110170387 A CN201110170387 A CN 201110170387A CN 102315776 B CN102315776 B CN 102315776B
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Abstract
The invention aims to provide an inverter power supply device, which can perform bias discrimination with excellent precision by casting no impact on the primary input current value of a transformer. The inverter power supply device comprises an inverter circuit; a transformer for transformation into voltages suitable for loading; an input current detecting circuit detecting the input current value of the transformer; an output current detecting circuit for detecting output current value; an output modulation control circuit for controlling the inverter circuit; a bias discriminating circuit for discriminating a bias when the input current value is more than the bias current standard value; and a prohibition circuit for prohibiting output modulation controls from the bias discriminating time point to the half-period end of the inverter frequency. The inverter power supply device is characterized in that every half-period bias current standard value is generated by adding a preset bias current value on a value generated after a bias current reference generating circuit performs sample retention on the input current value of the transformer in each half period according to the inverting frequency. The bias discriminating circuit makes a comparison between the input current value and the bias current reference value before a half period.
Description
Technical field
The present invention relates to a kind of inverter power supply device having carried the function of magnetic bias for eliminating transformer.
Background technology
For inverter power supply device, the magnetic bias of transformer is a large problem.Due to once reach capacity from magnetic bias, transformer will lose its function becomes short circuit load state, overcurrent flow to inverter circuit switch element, damage switch element.Magnetic bias is produced due to a variety of causes such as the deviation of characteristic, the instability of feedback control system of the sudden turn of events, switch element etc. of load.Especially, nearest inverter power supply device, also there is operating frequency (carrier frequency: carrier frequency) more than the situation of 100kHz, in the iron core of transformer, mostly use the FERRITE CORE (ferritecore) that loss is in high frequency few.But, FERRITE CORE due to the value of saturation flux density low, so magnetic bias just reaches capacity immediately a little.For this reason, in the inverter power supply device of high frequency, magnetic bias countermeasure is more important.What the following describes prior art prevents magnetic bias technology.
Fig. 8 is the circuit connection diagram preventing the inverter power supply device of magnetic bias function having carried prior art.3 phase bridge rectifier D R1 carry out rectification to 3 phase source power supply AC.Smmothing capacitor C is smoothing to rectified voltage, output dc voltage.DC power supply is formed by both DR1, C.Inverter circuit is formed to the 4th switch element TR4 by the first switch element TR1.At this, although inverter circuit mode is full-bridge mode, also can be push pull mode.ON/OFF control is carried out to the first switch element TR1 and the 4th switch element TR4 simultaneously, ON/OFF control is carried out to second switch elements T R2 and the 3rd switch element TR3 simultaneously.Then, direct voltage is converted to high-frequency ac by inverter circuit.
The voltage transformation of high-frequency ac is the voltage being suitable for load by the transformer INT shown in Fig. 8.When the first switch element TR1, the 4th switch element TR4 of an opposite side are conducting state, 1 secondary coil of transformer INT applies positive voltage, and input electric cur-rent measure signal Id becomes positive value.On the contrary, when second switch elements T R2, the 3rd switch element TR3 of opposite the opposing party are conducting state, 1 secondary coil of transformer INT applies the voltage born, and input electric cur-rent measure signal Id becomes negative value.If these just and the application time (voltage integrating meter value) of negative voltage become imbalance and will produce magnetic bias.Namely, if there is large difference due to the load sudden turn of events in the ON time of the second switch elements T R2 of the first switch element TR1 of an opposite side, the ON time of the 4th switch element TR4 and opposite the opposing party, the 3rd switch element TR3, magnetic bias will be produced.No. 2 times rectifier DR2 carries out rectification to the high-frequency ac that transformation is crossed.Direct current reactor DCL is smoothing and be supplied to load to rectified direct current.
Input electric cur-rent measure circuit I D, detects 1 primary current of transformer INT and exports as input electric cur-rent measure signal Id.Output current detection circuit OD detects output current and exports as output electric current measure signal Od.Output current initialization circuit IR exports the output current setting signal Ir of desired value.
Output modulation control circuit SC shown in Fig. 9, is formed by error amplifying circuit EI, pulse width modulation control circuit PWM, triangular wave oscillating circuit OSC, the first "AND" circuit AND1 and the second "AND" circuit AND2; The error of error amplifying circuit EI to output current setting signal Ir and output electric current measure signal Od is amplified, and output error amplifying signal Ei.Triangular wave oscillating circuit OSC exports the triangular signal Osc with the frequency of 2 times of the high-frequency ac frequency of inverter circuit, by the frequency of setting triangular signal Osc, decides the frequency (carrier frequency) of high-frequency ac.Pulse width modulation control circuit PWM for input, carries out pulse width modulation, output pulse width modulation signal Pw1, Pw2 with error amplification signal Ei and triangular signal Osc.
Inhibit circuit the first "AND" circuit AND1 as shown in Figure 9 and the second "AND" circuit AND2 is formed, first "AND" circuit AND1 perform magnetic bias judgment signal Ep described later and the first pulse width modulating signal Pw1's and logic, and export modulator control signal Sc1 as first and export; Second "AND" circuit AND2 perform magnetic bias judgment signal Ep and pulse width modulating signal Pw2's and logic, and export modulator control signal Sc2 as second and export.And first to export modulator control signal Sc1 be the signal that the first switch element TR1, the 4th switch element TR4 to an opposite side carries out conducting control; Second to export modulator control signal Sc2 be the signal that second switch elements T R2, the 3rd switch element TR3 to an opposite side carries out conducting control.And it is as described later in Figure 10 institute that the first output modulator control signal Sc1 and second exports modulator control signal Sc2, is half period shifted signal, formed 1 cycle of high-frequency ac by two signals.
Magnetic bias judging circuit EP shown in Fig. 9 by absolute value circuit FW, comparison circuit CP, current reference circuit IREF, prevent biasing circuit HD and circuit for reversing IN from being formed; Absolute value circuit FW carries out full-wave rectification to the input electric cur-rent measure signal Id exchanged, and is exported as absolute value signal Fw; Comparison circuit CP compares the value of absolute value signal Fw and predetermined current reference value Iref, when the value of absolute value signal Fw is larger than the value of current reference value Iref, makes comparison signal Cp become high level (High level) line output of going forward side by side.Prevent biasing circuit HD, when comparison signal Cp becomes high level, make to prevent bias magnetic signal Hd from becoming high level and exporting, until the half period of diagram abridged reverse frequency terminates all to prevent bias magnetic signal Hd from maintaining high level.Then, circuit for reversing IN reversion prevents bias magnetic signal Hd, and exports as magnetic bias judgment signal Ep.
Figure 10 is the sequential chart of the work of the magnetic bias method of discrimination that prior art is described, triangular signal Osc is represented with figure (A), the first pulse width modulating signal Pw1 is represented with figure (B), the second pulse width modulating signal Pw2 is represented with figure (C), input electric cur-rent measure signal Id is represented with figure (D), absolute value signal Fw is represented with figure (E), magnetic bias judgment signal Ep is represented with figure (F), represent the first output modulator control signal Sc1 with figure (G), represent the second output modulator control signal Sc2 with figure (H).
Then, use Figure 10 that the work preventing magnetic bias of prior art is described.
Such as, if set the maximum output current value of inverter power supply device as 300A, then input current value is 75A.And, set current reference value as 105A in order to ensure maximum output current value 300A.
During the moment t=t1 ~ t2 shown in Figure 10, as shown in Figure 10 (B), export and be used for the opposite first switch element TR1 of a side, the first pulse width modulating signal Pw1 of the 4th switch element TR4, shown in figure (D), input electric cur-rent measure signal Id is positive value.During this, positive voltage is applied to transformer INT.During moment t=t2 ~ t3, shown in figure (C), export and be used for opposite the second switch elements T R2 of the opposing party, the second pulse width modulating signal Pw2 of the 3rd switch element TR3, shown in figure (D), input electric cur-rent measure signal Id is negative value.During this small area analysis, (such as, input current 25A) is once because of load change generation magnetic bias, and just as shown in figure (D), the value of input electric cur-rent measure signal Id just rises, such as, become 40A.But owing to higher current reference value Iref being set as 105A, so just become not enough current reference value Iref with the value of the absolute value signal Fw of figure shown in (E), therefore, magnetic bias judging circuit EP can not differentiate generation magnetic bias.
In moment t4 ~ t5 during electric current in (such as, input current 50A) once because of load change produce magnetic bias, shown in Figure 10 (D), the value of input electric cur-rent measure signal Id will rise, such as, become 80A.But, owing to becoming not enough current reference value Iref, so magnetic bias judging circuit EP can not differentiate generation magnetic bias with the value of the absolute value signal Fw shown in figure (E).
During the big current of moment t6 ~ t7, (such as 75A) is once because of load change generation magnetic bias, and shown in Figure 10 (D), the value of input electric cur-rent measure signal Id just sharply rises, and arrives 120A.Now, in moment t=t61, once become more than current reference value Iref (105A) with the value of the absolute value signal Fw of figure shown in (E), then comparison circuit CP creates magnetic bias with regard to differentiating, makes comparison signal Cp become high level.Then, prevent biasing circuit HD, according to the high level of comparison signal CP, until moment t=t7 will prevent bias magnetic signal Hd from maintaining high level, utilize circuit for reversing IN to reverse and prevent bias magnetic signal Hd, and export as with the magnetic bias judgment signal Ep shown in figure (F).
Second "AND" circuit AND2 of the formation inhibit circuit shown in Fig. 9, carry out magnetic bias judgment signal Ep and the second pulse width modulating signal Pw2's and logic, export second shown in Figure 10 (H) and export modulator control signal Sc2, low level (Low level) is become at moment t=t61, thus, suppress current value to rise, prevent second switch elements T R2, the 3rd switch element TR3 damages.But, prevent from, in magnetic bias countermeasure, in order to ensure maximum output current value 300A, the value of current reference value Iref being uprised at this, due to inhibit pulse width under the state of carrying out fully in magnetic bias, so the time will be had in elimination magnetic bias.As a result, after moment t=t8, also can be absorbed in during input current value sharply rises, recurs state that pulse duration forbids.Therefore, if the elimination magnetic bias time is elongated, the protection of switch element just can not play one's part to the full, and becomes the reason of damage or deterioration.And, also can cause the labile state exported.
As mentioned above, in the prior art, in order to differentiate the magnetic bias of the transformer INT shown in Fig. 8, and detect the input current value of transformer INT, magnetic bias is determined as time more than the current reference value that this input current value is predetermined, half period from the time point of differentiation to reverse frequency terminates, and all makes the switch element of inverter circuit become cut-off state, carries out the elimination of magnetic bias.But; because higher setting differentiates the current reference value of magnetic bias; so differentiate under the state of carrying out fully in order to the magnetic bias at transformer INT, and the time that magnetic bias is eliminated is elongated, and the protection becoming switch element can not fully be worked, be damaged or the reason of deterioration.And, also can cause the labile state exported.
In the inverter power supply device of patent documentation 1, record a kind of technology eliminating above-mentioned magnetic bias.
Patent documentation 1 TOHKEMY 2007-20243
Summary of the invention
If become more than the current reference value of regulation be just determined as magnetic bias in the input current value of the primary side of above-mentioned transformer and forbid in the prior art export output modulator control signal, when the maximum output current value of inverter power supply device is such as 300A, require that the current reference value of the input current by being determined as magnetic bias is set in more than 300A higher in order to ensure maximum output current value.But if differentiate magnetic bias based on the current reference value of this higher setting, differentiate under just becoming the state of carrying out fully in magnetic bias, eliminating magnetic bias needs the time, the state that the output illegal state being absorbed in output modulator control signal produces continuously.Thus, overcurrent flows to the switch element forming inverter circuit, causes it to damage or deterioration.
In addition, because higher setting differentiates the current reference value of magnetic bias, so the initial magnetic bias produced at output current value hour can not be differentiated.
And, in the patent documentation 1 of prior art, although record and a kind ofly carry out differential in order to differentiate the magnetic bias that produces at output current value hour to the input current of the primary side of transformer, the method of magnetic bias is differentiated when the climbing of this differential value exceedes benchmark differential value, but in this method, the operating frequency (carrier frequency) of inverter power supply device is in the high speed more than 100kHz in recent years, due to this high speed, in differential method of discrimination, easily be subject to the impact of noise, at the reliability problems that magnetic bias differentiates.
Therefore, the object of the invention is, provide a kind of magnetic bias at transformer fully carry out before carry out the inverter power supply device of magnetic bias process.
In order to solve above-mentioned problem, the invention of claim 1 provides a kind of inverter power supply device, and this inverter power supply device comprises: inverter circuit, and it converts DC power supply to high-frequency ac by multiple switch element; Transformer, above-mentioned high-frequency ac transformation is the voltage being suitable for load by it; Input electric cur-rent measure circuit, it detects the input current value of above-mentioned transformer; Rectification circuit, it carries out rectification to the high-frequency ac after above-mentioned transformation and is supplied to load; Output current detection circuit, it detects the output current value after above-mentioned rectification; Export modulation control circuit, it carries out output modulation control according to above-mentioned output current value to above-mentioned inverter circuit; Magnetic bias judging circuit, is determined as the magnetic bias of above-mentioned transformer, and exports magnetic bias judgment signal when it is more than the bias current fiducial value that the input current value of above-mentioned transformer becomes predetermined; And inhibit circuit, it forbids above-mentioned output modulation control terminating from the half period of the time point to predetermined reverse frequency that input above-mentioned magnetic bias judgment signal, makes the switch element of above-mentioned inverter circuit be changed to cut-off state; The feature of this inverter power supply device is, arranges the bias current reference generating circuit for generation of above-mentioned bias current fiducial value; Above-mentioned bias current reference generating circuit carries out sampling by each half period of above-mentioned reverse frequency to the input current value of above-mentioned transformer and keeps, and the value after above-mentioned sampling keeps adds predetermined bias current value, produces the bias current fiducial value of each above-mentioned half period; Above-mentioned magnetic bias judging circuit compares above-mentioned input current value and the bias current fiducial value before the above-mentioned half period.
The invention of claim 2 is inverter power supply devices according to claim 1, it is characterized in that, based on the input current value before the above-mentioned half period, above-mentioned bias current value is changed.
Invention effect
According to claim 1 of the present invention, input current value due to each half period according to reverse frequency sets suitable bias current fiducial value, so magnetic bias differentiation can be carried out immediately after the magnetic bias producing transformer, differentiated the overcurrent that can suppress to flow to the switch element of inverter circuit after magnetic bias produces immediately by this magnetic bias, damage or the deterioration of switch element can be prevented.
And, relative to carrying out differential to the input current of transformer and differentiating the prior art of magnetic bias based on the climbing of the differential value of this input current, in magnetic bias of the present invention differentiates, because the climbing not based on differential value carries out the differentiation of magnetic bias, so be difficult to the impact being subject to high-frequency noise, improve the reliability that magnetic bias differentiates.
According to claim 2 of the present invention; because the input current value based on transformer produces bias current value; so differentiation when can carry out the small area analysis of magnetic bias generation differentiation difficulty, due to the process eliminating magnetic bias can be carried out, so protection coordination is further improved at the magnetic bias initial stage of producing.
Accompanying drawing explanation
Fig. 1 is the electrical connection graph of the inverter power supply device of execution mode 1.
Fig. 2 is the details figure of the magnetic bias judging circuit shown in Fig. 1.
Fig. 3 is the sequential chart of the work that execution mode 1 is described.
Fig. 4 is the input current value of the transformer of execution mode 1 and the graph of a relation of bias current fiducial value.
Fig. 5 is the details figure of the magnetic bias judging circuit of execution mode 2.
Fig. 6 is the sequential chart of the work that execution mode 2 is described.
Fig. 7 is the input current value of the transformer of execution mode 2 and the graph of a relation of bias current fiducial value.
Fig. 8 is the electrical connection graph of the inverter power supply device of prior art.
Fig. 9 is the details figure of the magnetic bias judging circuit of the prior art shown in Fig. 7.
Figure 10 is the sequential chart of the work that prior art is described.
Symbol description
In figure: 1-load, AD-add circuit, AND1-first "AND" circuit, AND2-second "AND" circuit, C1-smmothing capacitor, CP-comparison circuit, Cp-comparison signal, DK-inverse changing driving circuit, Dk1-first inversion drive singal, Dk2-second inversion drive singal, Dk3-the 3rd inversion drive singal, Dk4-the 4th inversion drive singal, DCL-direct current reactor, DR1-1 rectification circuit, DR2-2 rectification circuit, EH-bias current reference generating circuit, EI-corresponding input current bias current initialization circuit, EHI-corresponding input current bias current reference generating circuit, EP-magnetic bias judging circuit, Ep-magnetic bias judgment signal, EPI-magnetic bias judging circuit, Epi-magnetic bias judgment signal, EI-error amplifying circuit, Ei-error amplification signal, ES-bias current initialization circuit, FW-absolute value circuit, Fw-absolute value signal, FS-phase-shift circuit, HD-prevents biasing circuit, Hd-prevents bias magnetic signal, ID-input electric cur-rent measure circuit, Id-input electric cur-rent measure signal, IN-circuit for reversing, INT-main transformer, IR-output current initialization circuit, Ir-output current setting signal (output current set point), IREF-current reference circuit, Iref-current reference signal, OD-output current detection circuit, Od-output electric current measure signal, OSC-circuit for generating triangular wave, Osc-triangular wave produces signal, PWM-pulse width modulation circuit, Pw1-first pulse width modulating signal, Pw2-second pulse width modulating signal, SC-exports modulation control circuit, Sc1-first exports modulation control, Sc2-second exports modulation control, TR1-first switch element, TR2-second switch element, TR3-the 3rd switch element, TR4-the 4th switch element
Embodiment
In the transformer shown in Fig. 1, if produce uneven in positive and negative each half-wave of high-frequency ac, bias current and direct current will be produced in the half-wave of a side of transformer.Now, cause magnetic saturation, transformer becomes short circuit load state, and the input current of transformer becomes excessive, produces the danger that the switch element of formation inverter circuit is destroyed.
Embodiments of the present invention add predetermined bias current value in the input current value of the transformer of each half period of reverse frequency, produce bias current fiducial value, input current value and the bias current fiducial value before the half period are compared, when input current value is more than bias current fiducial value, differentiates and create magnetic bias.
Fig. 1 is the electrical connection graph of the inverter power supply device of the execution mode 1 with above-mentioned magnetic bias discrimination function.In same figure, the construct identical with the electrical connection graph symbol of the inverter power supply device of the prior art shown in Fig. 8, owing to carrying out identical work, so omit the description, only illustrates the construct that symbol is different.
Input electric cur-rent measure circuit I D detects 1 primary current of the high-frequency ac of the primary side of transformer INT, and exports as input electric cur-rent measure signal Id.
Fig. 2 is the magnetic bias judging circuit EPI of execution mode 1 and the details figure of bias current reference generating circuit EH, magnetic bias judging circuit EPI, by absolute value circuit FW, comparison circuit CP, prevents biasing circuit HD and circuit for reversing IN from being formed.And bias current reference generating circuit EH, is formed by sample-and-hold circuit SH, bias current initialization circuit ES, add circuit AD and phase-shift circuit FS.
Sample-and-hold circuit SH, is synchronized with the first output modulator control signal Sc1 and second and exports modulator control signal Sc2, carries out sampling keep the value of absolute value signal Fw, it can be used as sampling inhibit signal Sh to export.
Bias current initialization circuit ES, sets predetermined bias current value α.Add circuit AD adds the predetermined bias current value α set by bias current initialization circuit ES in the value of sampling inhibit signal Sh, and exports additive signal Ad.Once input additive signal Ad, phase-shift circuit FS is synchronized with reverse frequency makes the additive signal Ad phase delay half period, and exports as bias current reference signal Eh.
Now, such as, as 1 secondary coil N1, the 2 secondary coil N2 of transformer INT, if the coefficient of coil ratio (N2/N1) is such as 1/4, the maximum output current value of inverter power supply device is 300A, then input current value is 75A.And if such as set bias current value α as 40A, and differentiate magnetic bias by bias current fiducial value 115A, then the 40A due to bias current value α is comparatively large, so differentiate under the state just fully can carried out in magnetic bias.
On the contrary, if reduce bias current value α to be set to 20A, bias current fiducial value is set to 95A to differentiate magnetic bias, although then no problem in magnetic bias differentiates, but when the load short circuits shown in Fig. 1, can produce suppress to carry out short circuit releasing electrical current, short circuit can not be carried out well and remove such problem.
By above-mentioned, if differentiated under the state of setting bias current value α just fully can not carry out in magnetic bias as 30A, and short circuit releasing can also be carried out well.
The input current value that Fig. 4 is bias current value α when being 30A and the graph of a relation of bias current fiducial value, show the corresponding input current value of bias current fiducial value and situation about changing.
The value of comparison circuit CP shown in Fig. 2 to the value of absolute value signal Fw and bias current fiducial value Eh compares, and when the value of absolute value signal Fw is larger than bias current fiducial value Eh, makes comparison signal Cp become high level and exports.When comparison signal Cp becomes high level, prevent biasing circuit HD from just making to prevent bias magnetic signal Hd from becoming high level and export, until the half period of diagram abridged reverse frequency terminates all to maintain output.Then, circuit for reversing IN reversion prevents bias magnetic signal Hd, and exports as magnetic bias judgment signal Epi.
Fig. 3 is the sequential chart of the work of the magnetic bias method of discrimination that execution mode 1 is described, triangular signal Osc is represented with figure (A), the first pulse width modulating signal Pw1 is represented with figure (B), the second pulse width modulating signal Pw2 is represented with figure (C), input electric cur-rent measure signal Id is represented with figure (D), absolute value signal Fw is represented with figure (E), sampling inhibit signal Sh is represented with figure (F), bias current reference signal Eh is represented with figure (G), magnetic bias judgment signal Epi is represented with figure (H), the first output modulator control signal Sc1 is represented with figure (i), the second output modulator control signal Sc2 is represented with figure (J).
Then, use Fig. 3 and Fig. 4 that the work that the magnetic bias of execution mode 1 differentiates is described.
During the small area analysis of the moment t=t1 ~ t2 shown in Fig. 3, when input current value (25A) of the C point shown in Fig. 4, sample-and-hold circuit SH shown in Fig. 2, be synchronized with the first output modulator control signal Sc1 and carry out sampling maintenance, when the first output modulator control signal Sc1 becomes the moment t=t11 of low level (low level), sampling keeps input current value (25A), and exports as the sampling inhibit signal Sh shown in Fig. 3 (F).
Add circuit AD shown in Fig. 2, the value (25A) of the sampling inhibit signal Sh illustrated at Fig. 3 (F) adds predetermined bias current value (30A), and exports as additive signal Ad.Once input additive signal Ad, phase-shift circuit FS with regard to carrying out phase shift until the moment t=t2 that terminates of the half period of reverse frequency, and to export as bias current fiducial value Eh.
If produce magnetic bias because of load change in during the small area analysis of moment t=t2 ~ t3, shown in Fig. 3 (D), the value of input electric cur-rent measure signal Id sharply rises, such as, become 40A.Then, comparison circuit CP is in moment t=t21, value (55A) with the value (40A) of absolute value signal Fw shown in figure (E) and the bias current fiducial value Eh before the half period of reverse frequency is compared, because the value of absolute value signal Fw is less than the value of bias current fiducial value Ec, so magnetic bias judging circuit EPI can not differentiate generation magnetic bias, so magnetic bias judgment signal Epi becomes high level.
In moment t=t3 ~ t4 during electric current in, when input current value (50A) of B point as shown in Figure 4, sample-and-hold circuit SH shown in Fig. 2, be synchronized with the first output modulator control signal Sc1 and carry out sampling maintenance, when the first output modulator control signal Sc1 becomes low level moment t=t31, sampling keeps input current value (50A), and exports as the sampling inhibit signal Sh shown in Fig. 3 (F).
Add circuit AD, the value (50A) of the sampling inhibit signal Sh illustrated at Fig. 3 (F) adds bias current value (30A), and exports as additive signal Ad.Once input additive signal Ad, phase-shift circuit FS just carries out phase shift, until the moment t=t4 that the half period of reverse frequency terminates, and exports as bias current fiducial value Eh.
If in moment t=t4 ~ t5 during electric current in produce magnetic bias because of load change, shown in Fig. 3 (D), the value of input electric cur-rent measure signal Id sharply rises, such as, become 80A.Then, comparison circuit CP is in moment t=t41, compare with the value (80A) of absolute value signal Fw shown in figure (E) and the bias current fiducial value Eh (80A) before the half period of reverse frequency, value due to absolute value signal Fw becomes more than bias current fiducial value Eh, so comparison circuit CP makes comparison signal Cp become high level, prevent the high level of the corresponding comparison signal Cp of biasing circuit HD from making to prevent bias magnetic signal Hd from becoming high level, until moment t=t5 maintains high level.Then, prevent bias magnetic signal Hd by circuit for reversing IN reversion, make to become low level with the magnetic bias judgment signal Epi of figure shown in (H).
Form the second "AND" circuit AND2 of the inhibit circuit shown in Fig. 2, carry out magnetic bias judgment signal Epi and the second pulse width modulating signal Pw2's and logic, and export the second output modulator control signal Sc2, low level is become at moment t=t41, thus, the moment t=t5 that half period from the time point of input magnetic bias judgment signal to high-frequency ac terminates forbids the second output modulator control signal Sc2, suppresses the rising of bias current, carries out the elimination of magnetic bias.
During moment t=t5 ~ t6, sample-and-hold circuit SH shown in Fig. 2, be synchronized with the first output modulator control signal Sc1 and carry out sampling maintenance, sampling maintenance is carried out to the first input current value (75A) exported when modulator control signal Sc1 becomes low level moment t=t51, and exports as the sampling inhibit signal Sh shown in Fig. 3 (F).
Add circuit AD, the value (75A) of sampling inhibit signal Sh adds bias current value (30A), and exports as additive signal Ad.Once input additive signal Ad, phase-shift circuit FS just carries out phase shift, until the moment t=t6 that the half period of reverse frequency terminates, and exports as bias current fiducial value Eh.
If again produce magnetic bias because of the sudden turn of events of load in during the big current of the moment t=t6 ~ t7 shown in Fig. 3, shown in Fig. 3 (D), the value of input electric cur-rent measure signal Id sharply rises, such as, become 120A.Then, comparison circuit CP is in moment t=t61, value (105A) with the value (120A) of absolute value signal Fw shown in figure (E) and the bias current fiducial value Eh before the half period of reverse frequency is compared, because the value (120A) of absolute value signal Fw is at more than bias current fiducial value Eh (105A), so comparison circuit CP makes comparison signal Cp become high level, prevent the high level of the corresponding comparison signal Cp of biasing circuit HD from making to prevent bias magnetic signal Hd from becoming high level, until moment t=t7 maintains high level.Then, prevent bias magnetic signal Hd by circuit for reversing IN reversion, make to become low level with the magnetic bias judgment signal Epi of figure shown in (H).
Form the second "AND" circuit AND2 of the inhibit circuit shown in Fig. 2, carry out magnetic bias judgment signal Epi and the second pulse width modulating signal Pw2's and logic, and export the second output modulator control signal Sc2, low level is become at moment t=t61, thus, the moment t=t7 that half period from the time point of input magnetic bias judgment signal to high-frequency ac terminates forbids the second output modulator control signal Sc2, suppress the rising of bias current, carry out the elimination of magnetic bias, prevent second switch elements T R2, the 3rd switch element TR3 damages.
In addition, sample as carrying out input current value the timing kept, although such as carry out when first to export modulator control signal Sc1 be low level, the interlude point between the period of output that also can export modulator control signal Sc1 first carries out sampling maintenance.
As mentioned above; input current value adding, predetermined bias current value is to calculate bias current fiducial value; if differentiate magnetic bias based on this bias current fiducial value calculated; just can differentiate magnetic bias before magnetic bias is carried out fully; owing to carrying out preventing magnetic bias process in the starting stage of magnetic bias; so just magnetic bias can be eliminated early, switch element not deterioration or the damage because of overcurrent of protection inverter circuit.
The explanation of one embodiment 2.
In inverter power supply device, in direct current reactor, usually use the direct current reactor with closed loop characteristic.And in the direct current reactor with closed loop characteristic, when output current value is large, inductance value diminishes, on the contrary, when output current value hour, inductance value becomes large.
Therefore, because when output current value is large, the inductance value of direct current reactor is little, so the rate of change of the input current of transformer (di/dt) becomes large, when producing magnetic bias, the input current of transformer changes widely.On the contrary, because the inductance value at output current value hour direct current reactor is large, so the rate of change of the input current of transformer (di/dt) diminishes, when producing magnetic bias, the change of the input current of transformer diminishes.
As mentioned above, by increasing the bias current value differentiating magnetic bias when output current value is large, on the contrary, reduce at output current value hour the bias current value differentiating magnetic bias, just greatly increase the discrimination precision of magnetic bias.
Fig. 7 is the graph of a relation of input current value and bias current fiducial value, shows the corresponding input current value of bias current value α and situation about changing.
Fig. 5 is the details figure of the magnetic bias judging circuit of execution mode 2.In same figure, the construct identical with the details schematic symbol of the magnetic bias judging circuit of the Fig. 2 shown in execution mode 1, owing to carrying out identical work, so omit the description, only illustrates the construct that symbol is different.
Corresponding input current bias current reference generating circuit EHI shown in Fig. 5 is formed by sample-and-hold circuit SH, corresponding input current bias current initialization circuit EI, add circuit AD and phase-shift circuit FS.
Sample-and-hold circuit SH and first exports modulator control signal Sc1 and second, and to export modulator control signal Sc2 synchronous, carries out sampling keep the value of absolute value signal Fw, and export as sampling inhibit signal Sh.
Corresponding input current bias current initialization circuit EI, as shown in Figure 7, makes bias current value α change according to input current value.Add circuit AD adds the bias current value α set by corresponding input current bias current initialization circuit EI in the value of sampling inhibit signal Sh, and exports as additive signal Ad.
Fig. 6 is the sequential chart of the work of the magnetic bias method of discrimination that execution mode 2 is described, triangular signal Osc is represented with figure (A), the first pulse width modulating signal Pw1 is represented with figure (B), the second pulse width modulating signal Pw2 is represented with figure (C), input electric cur-rent measure signal Id is represented with figure (D), absolute value signal Fw is represented with figure (E), sampling inhibit signal Sh is represented with figure (F), bias current reference signal Eh is represented with figure (G), magnetic bias judgment signal Epi is represented with figure (H), the first output modulator control signal Sc1 is represented with figure (i), the second output modulator control signal Sc2 is represented with figure (J).
Then, use Fig. 5 to Fig. 7 that the work that the magnetic bias of execution mode 2 differentiates is described.
During the small area analysis of the moment t=t1 ~ t2 shown in Fig. 6, when input current value (25A) of the C point shown in Fig. 7, sample-and-hold circuit SH shown in Fig. 5, be synchronized with the first output modulator control signal Sc1 and carry out sampling maintenance, carry out sampling to the input current value (25A) when the first output modulator control signal Sc1 becomes low level moment t=t11 to keep, and export as the sampling inhibit signal Sh shown in Fig. 3 (F).Then, add circuit AD shown in Fig. 5, the value (25A) of the sampling inhibit signal Sh illustrated at Fig. 6 (F) adds the input current value before by the half period of the corresponding reverse frequency of corresponding input current bias current initialization circuit EI and the bias current value (such as 4A) that produces, and export as additive signal Ad, once input additive signal Ad, then phase-shift circuit FS just carries out phase shift, until the moment t=t2 that the half period of reverse frequency terminates, and export as bias current fiducial value Eh (29A).
If produce magnetic bias because of load change in during the small area analysis of moment t=t2 ~ t3, shown in Fig. 6 (D), the value of input electric cur-rent measure signal Id sharply rises, such as, become 40A.Then, comparison circuit CP is in moment t=t21, value (29A) with the value (40A) of absolute value signal Fw shown in figure (E) and the bias current fiducial value Eh before the half period of reverse frequency is compared, because the value of absolute value signal Fw is larger than the value of bias current fiducial value Eh, so comparison circuit CP makes comparison signal Cp become high level, prevent biasing circuit HD, the high level of corresponding comparison signal Cp makes to prevent bias magnetic signal Hd from becoming high level, until t=t3 maintains high level.Then, prevent bias magnetic signal Hd by circuit for reversing IN reversion, make the magnetic bias judgment signal Epi illustrated with figure (H) become low level.
Form the second "AND" circuit AND2 of inhibit circuit, carry out magnetic bias judgment signal Epi and the second pulse width modulating signal Pw2's and logic, and export the second output modulator control signal Sc2, low level is become at moment t=t21, thus, the moment t=t3 that half period from the time point of input magnetic bias judgment signal to high-frequency ac terminates forbids the output of the second output modulator control signal Sc2, suppresses the rising of bias current, carries out the elimination of magnetic bias.
In moment t=t3 ~ t4 during electric current, when input current value (50A) of the B point shown in Fig. 7, sample-and-hold circuit SH shown in Fig. 5, be synchronized with the first output modulator control signal Sc1 and carry out sampling maintenance, sampling maintenance is carried out to the first input current value (50A) exported when modulator control signal Sc1 becomes low level moment t=t31, and exports as the sampling inhibit signal Sh shown in Fig. 6 (F).Then, add circuit AD shown in Fig. 5, the value (50A) of the sampling inhibit signal Sh illustrated at Fig. 6 (F) adds the bias current value (10A) produced by the corresponding input current value of corresponding input current bias current initialization circuit EI, and export as additive signal Ad, once input additive signal Ad, then phase-shift circuit FS just carries out phase shift, until the moment t=t4 that the half period of reverse frequency terminates, and export as bias current fiducial value Eh (60A).
If in the moment t=t4 ~ t5 shown in Fig. 6 during electric current in produce magnetic bias because of load change, shown in Fig. 6 (D), the value of input electric cur-rent measure signal Id sharply rises, such as, become 80A.Then, in moment t=t41, the value (60A) of the bias current fiducial value Eh before the value (80A) with the absolute value signal Fw shown in figure (E) and the half period by the reverse frequency of bias current reference generating circuit EH generation is compared, because the value (80A) with the absolute value signal Fw shown in figure (E) is at more than bias current fiducial value Eh (60A), so comparison circuit CP makes comparison signal Cp become high level, prevent the high level of the corresponding comparison signal Cp of biasing circuit HD and make to prevent bias magnetic signal Hd from becoming high level, until moment t=t5 maintains high level.Then, prevent bias magnetic signal Hd by circuit for reversing IN reversion, make to become low level with the magnetic bias judgment signal Epi of figure shown in (H).
Form the second "AND" circuit AND2 of inhibit circuit, carry out magnetic bias judgment signal Epi and the second pulse width modulating signal Pw2's and logic, and export the second output modulator control signal Sc2, low level is become at moment t=t41, thus, the moment t=t5 that half period from the time point of input magnetic bias judgment signal to high-frequency ac terminates forbids the second output modulator control signal Sc2, suppresses the rising of bias current, carries out the elimination of magnetic bias.
During moment t=t5 ~ t6, sample-and-hold circuit SH shown in Fig. 5, be synchronized with the first output modulator control signal Sc1 and carry out sampling maintenance, sampling maintenance is carried out to the first input current value (75A) exported when modulator control signal Sc1 becomes low level moment t=t51, and exports as the sampling inhibit signal Sh shown in Fig. 6 (F).
Add circuit AD, the value (75A) of sampling inhibit signal Sh adds bias current value (20A), and exports as additive signal Ad.Once input additive signal Ad, then phase-shift circuit FS just carries out phase shift, until the moment t=t6 that the half period of reverse frequency terminates, and exports as bias current fiducial value Eh (95A).
If again produce magnetic bias because of the sudden turn of events of load in during the big current of the moment t=t6 ~ t7 shown in Fig. 6, shown in Fig. 6 (D), the value of input electric cur-rent measure signal Id sharply rises, such as, become 120A.Then, in moment t=t61, the value (95A) of the bias current fiducial value Eh before the value (120A) with the absolute value signal Fw shown in figure (E) and the half period by the reverse frequency of bias current reference generating circuit EH generation is compared.Because the value (120A) with the absolute value signal Fw shown in figure (E) is at more than bias current fiducial value Eh (95A), so comparison circuit CP makes comparison signal Cp become high level, prevent the high level of the corresponding comparison signal Cp of biasing circuit HD and make to prevent bias magnetic signal Hd from becoming high level, until moment t=t7 maintains high level.Then, prevent bias magnetic signal Hd by circuit for reversing IN reversion, make to become low level with the magnetic bias judgment signal Epi of figure shown in (F).
Then, carry out work same as described above later.
As mentioned above; owing to producing bias current value based on the input current value before the half period of reverse frequency; so the differentiation of magnetic bias generation can be carried out for the magnetic bias produced at output current value hour; the elimination time of magnetic bias shortens; the overcurrent flowing to the switch element forming inverter circuit can be suppressed early, greatly improve the precision of protection coordination.
Claims (2)
1. an inverter power supply device, comprising:
Inverter circuit, it converts DC power supply to high-frequency ac by multiple switch element;
Transformer, above-mentioned high-frequency ac transformation is the voltage being suitable for load by it;
Input electric cur-rent measure circuit, it detects the input current value of above-mentioned transformer;
Rectification circuit, it carries out rectification to the high-frequency ac after above-mentioned transformation, and is supplied to load;
Output current detection circuit, it detects the output current value after above-mentioned rectification;
Export modulation control circuit, it carries out output modulation control according to above-mentioned output current value to above-mentioned inverter circuit;
Magnetic bias judging circuit, it is determined as the magnetic bias of above-mentioned transformer when the input current value of above-mentioned transformer becomes more than bias current fiducial value, and exports magnetic bias judgment signal; And
Inhibit circuit, it forbids above-mentioned output modulation control terminating from the half period of the time point to predetermined reverse frequency that input above-mentioned magnetic bias judgment signal, makes the switch element of above-mentioned inverter circuit be changed to cut-off state,
The feature of this inverter power supply device is,
Bias current reference generating circuit for generation of above-mentioned bias current fiducial value is set,
Above-mentioned bias current reference generating circuit carries out sampling by each half period of above-mentioned reverse frequency to the input current value of above-mentioned transformer and keeps, and the value after above-mentioned sampling keeps adds predetermined bias current value, produce the bias current fiducial value of each above-mentioned half period
Above-mentioned magnetic bias judging circuit compares the bias current fiducial value before the above-mentioned half period in the moment of the above-mentioned input current value that detects and this detection.
2. inverter power supply device according to claim 1, is characterized in that,
Based on the input current value before the above-mentioned half period, above-mentioned bias current value is changed.
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| JP6155168B2 (en) * | 2013-10-30 | 2017-06-28 | 東芝三菱電機産業システム株式会社 | Power converter |
| JP6246114B2 (en) * | 2014-12-16 | 2017-12-13 | 三菱電機株式会社 | Inverter control device linked to AC system via transformer |
| CN107947122B (en) * | 2017-11-03 | 2019-03-01 | 漳州科华技术有限责任公司 | The fault tolerant control method of UPS load current acquisition failure and the device of application this method |
| KR102181652B1 (en) * | 2019-10-10 | 2020-11-23 | 엘지전자 주식회사 | Apparatus for controlling motor and motor control method thereof |
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