CN1956310A - Wave method of silicon controlled crystal brake pipe rectifier and its device - Google Patents

Abstract

This invention discloses a waving method and a device for the rectifier of silicon controlled thyristor including: obtaining waving time scale of thyristors in a rectifier based on the phase and amplitude character of input voltage and trigger angles of the thyristors, presetting said waving time in a comparing unit of the timer, if the time is matched to the timer, then the timer comparison is stopped to change the phase of the thyristor. Said device includes a signal transmitting module sending phase-change operation signals to silicon controlled thyristors of a rectifier, an obtaining module getting waving time of the thyristors based on the phase and amplitude character of input voltage and trigger angle of the thyristor and a timer module locating said signal sending module to send the time scale of the phase-change operation signal based on said waving time scale.

Description

The Wave method of silicon controlled crystal brake pipe rectifier and device thereof

[technical field]

The present invention relates to the commutation technique field, particularly the Wave method of silicon controlled crystal brake pipe rectifier and device thereof.

[background technology]

Current high power UPS great majority adopt analog control technique, and in order to improve reliability, changing into digital control is an inevitable trend.Limited by power device electric current and voltage stress, the high power UPS rectifier adopts silicon controlled crystal brake pipe (SCR) commutation technique usually.And behind the high-power SCR rectifier employing digital control technology, because digital control distinctive sampling own and control time-delay, make rectifier send out the ripple precision and reduce, cause SCR rectifier input current asymmetric easily, the problems such as control stability reduction of increase of bus ripple and system.

Digital control SCR rectifier adopts main program to add the software frame that regularly interrupts usually.Main program adopts the endless loop mode, mainly realizes the various logic control of rectifier, such as: input voltage and the current effective value to rectifier calculates, battery all fills floating charge conversion and control and various Fault Diagnosis etc.; And regularly interrupt main timing sampling, dc bus voltage stabilizing control, rectifier Current limited Control, the charging current limiter control that realizes analog quantity and digital I signal, and rectifier SCR sends out ripple or the like.In all control, SCR sends out the basis that ripple is digital control SCR rectifier, and SCR sends out the ripple precision directly influences the symmetry of rectifier input current and the size of bus ripple.

Traditional digital control SCR rectifier is sent out the ripple mode, adopts the mode of operation IO switch in regularly interrupting usually.Conventional digital control SCR rectifier Wave method is described below:

Three-phase input line voltage u _Ab, u _Bc, u _CaObtain input voltage at Alpha, the value u of Beta coordinate system through park conversion (3 phase coordinates are to 2 phase coordinates conversion) _Alpha, u _Beta:

$\left\{\begin{array}{c}{u}_{\mathrm{alpha}}=\frac{2}{3}(u_{\mathrm{ab}}-{0.5u}_{\mathrm{bc}}-{0.5u}_{\mathrm{ca}})\\ u_{\mathrm{beta}}=\frac{2}{3}(\frac{\sqrt{3}}{2}{u}_{\mathrm{bc}}-\frac{\sqrt{3}}{2}{u}_{\mathrm{ca}})\end{array}---\left(1\right)\right.$

Pass through u _Alpha, u _BeltaCan calculate input voltage vector mould and input voltage vector angle θ:

$u_{\mathrm{mode}}=\sqrt{{\mathrm{<figure-callout\; id="2"\; label="u\; alpha"\; filenames="A20061006291100181.png"\; state="\{\{state\}\}">u</figure-callout>}}_{\mathrm{alpha}}^{}+u_{\mathrm{beta}}^2}---\left(2\right)$

$\left\{\begin{array}{c}\sin \left(\mathrm{\&theta;}\right)=\frac{u_{\mathrm{alpha}}}{u_{\mathrm{mode}}}\\ \cos \left(\mathrm{\&theta;}\right)=-\frac{u_{\mathrm{beta}}}{u_{\mathrm{mode}}}\end{array}---\left(3\right)\right.$

Can obtain input voltage vector angle θ, this θ angle and input line voltage u to cos (θ) cosine of negating _AbThe phase angle unanimity.Consider line voltage u _Ab→ u _Ac→ u _Bc→ u _Ba→ u _Ca→ u _Cb→ u _AbZero crossing differs 60 degree, if the SCR trigger angle is α and deducts the 60 natural angle of overlaps of spending that then the triggering of SCR and commutation condition are:

According to top commutation condition, register ScrEnable of software definition, 6 of low 6 the corresponding three-phase SCR rectifiers of register ScrEnable drive IO, just can realize that according to input voltage vector angle θ and SCR trigger angle α the ripple of sending out of SCR operates.

Fig. 1 carries out the flow chart that SCR sends out ripple in the prior art, flow process roughly is: after SCR sends out ripple and begins, make θ ab=θ-60; θ ac=θ-120; θ bc=θ-180; θ ba=θ-240; θ ca=θ-300; θ cb=θ; Then, remove all and trigger enable flag: Eab, Eac, Ebc, Eba, Eca, Ecb; And then, determine these enabler flags in order successively; The corresponding SCR that carries out of value according to enable flag drives the IO processing, sends out wave process thereby finish whole SCR.

Fig. 2 is a flow chart of determining the Eab enabler flags among Fig. 1, and definite process of other enabler flags is similar with it, judges the magnitude relationship of θ ab and SCR trigger angle α:

If θ ab is positioned at the interval (δ determines the width of burst pulse) of [α, α+δ], then Eab=1 A+ among the ScrEnable and beta-position set, removes other all enabler flags simultaneously, promptly all is changed to 0, the set situation that sees table:

ScrEnable：

C -

B -

A -

C +

B +

A +

0

1

0

0

0

1

Otherwise Eab is changed to 0, thereby finishes the definite process to Eab.

By said process as can be known, in numerical control system, the commutation operation realizes in regularly interrupting usually, and the position of program in interruption of execution commutation operation part is relatively-stationary, and only carries out once in an interruption; In the timing interrupt service routine, operate that part of program except carrying out commutation, also have a lot of other programs to need to carry out, interrupt from entering regularly for this reason, operate that part of program and need the time to beginning to carry out commutation, in general this time is relatively-stationary; In addition, the commutation of expectation is to be calculated by control system constantly, and to be engraved on the time shaft be at random during the commutation of expectation for this reason, may be positioned at the front of commutation operation, also might be in the back of commutation operation.For this reason, constantly just might there be deviation in the actual SCR commutation moment and the commutation of expectation, and Fig. 3 is the expectation commutation moment and an actual commutation moment graph of a relation in the conventional Wave method, and employed mark is represented following meanings respectively among the figure:

Original position is regularly interrupted in zero expression ● expression expectation commutation constantly

Commutation operation during expression is regularly interrupted

When if expectation is engraved in actual commutation operation front during commutation, shown in Fig. 3 (a),, carry out SCR commutation operation when program running during to the commutation operation, in this case, the expectation commutation constantly and the error in the actual commutation moment be T _{Err_A}

If when being engraved in actual commutation operation back during the expectation commutation, shown in Fig. 3 (b), owing to missed the commutation operation of this interruption, need program running just can carry out the SCR commutation when the next commutation of interrupting is operated, in this case the expectation commutation moment and actual commutation error constantly are T for this reason _{Err_B}

Obviously, T _{Err_B}Maximum be one interrupt cycle T _sWhen adopting this method, rectifier to send out a ripple precision be a T _s, work as T _sWhen big (such as 200uS), will make the rectifier bus bigger ripple voltage occur, thereby reduce the quality of rectifier output voltage.

[summary of the invention]

The technical problem to be solved in the present invention provides the Wave method and the device thereof of silicon controlled crystal brake pipe rectifier, realizes accurate SCR commutation operation, improves the quality of rectifier output voltage.

Technical scheme of the present invention is:

The Wave method of silicon controlled crystal brake pipe rectifier may further comprise the steps:

101, according to the phase place and/or the amplitude characteristic of input voltage, and the trigger angle of silicon controlled crystal brake pipe, that obtains each silicon controlled crystal brake pipe in the rectifier sends out ripple constantly;

102, in the comparing unit of timer, preset described ripple constantly,, timer then takes place relatively interrupt, thereby corresponding silicon controlled crystal brake pipe is carried out the commutation operation if described ripple mates with timer constantly.

Step 101 further comprises:

Sampling instant T when 201, adjacent twice AD of record samples _T-1, T _t, and (θ-60 °-α) angle value θ of the corresponding 6* of two sampling instants _T-1And θ _t, obtain by linear interpolation method $T_F=T_t-\frac{{\mathrm{\&theta;}}_t}{\mathrm{\&Delta;\&theta;}}*T_s,$ Wherein, α is the trigger angle of described silicon controlled crystal brake pipe, T _s=T _t-T _T-1, Δ θ=θ _t+ 360 °-θ _T-1

202, T _F+ Δ T sends out ripple constantly as described rectifier, and wherein, Δ T is the droop that an assurance timer can take place relatively to interrupt.

Step 102 further comprises:

Described ripple is preset at constantly in the same comparing unit of timer.

Step 101 further comprises:

Obtain adjacent twice zero crossing of each line voltage constantly, correspondence obtains a ripple moment of each silicon controlled crystal brake pipe in the rectifier

Wherein, T _Zero, T _Zero' representing this zero crossing moment of corresponding line voltage and zero crossing moment last time respectively, α is the trigger angle of described silicon controlled crystal brake pipe, T _Period=T _Zero-T _Zero'.

In the step 101, obtain adjacent twice zero crossing of each line voltage and constantly further comprise:

Sampling instant T when writing down adjacent twice AD sampling _T-1, T _t, and the instantaneous voltage u (t-1) of corresponding input line voltage, u (t), this zero crossing that draws input line voltage by linear interpolation method is constantly

$T_{\mathrm{zero}}=T_t-\frac{u\left(t\right)}{u\left(t\right)-u(t-1)}{T}_s,$ Wherein, T _s=T _t-T _T-1In like manner, get the zero crossing moment last time T of outlet voltage _Zero'.

In the step 101, obtain adjacent twice zero crossing of each line voltage and constantly further comprise:

By capture unit, catch adjacent twice zero crossing of each line voltage constantly, the number of described capture unit is identical with the rectification pulse number of rectifier.

Further comprise in the step 102:

Described ripple is preset at respectively in three comparing units of same timer constantly, and presets in the same comparing unit pairing ripple moment of two phase line voltages of phase phasic difference 180 degree.

A wave apparatus of silicon controlled crystal brake pipe rectifier comprises the signal transmitting module that is used for sending to the silicon controlled crystal brake pipe of rectifier the commutation operation signal; Also comprise:

According to the phase place and/or the amplitude characteristic of input voltage, and the trigger angle of silicon controlled crystal brake pipe, obtain in the rectifier each silicon controlled crystal brake pipe and send out ripple acquisition module constantly;

With constantly, locate described signal transmitting module and send commutation operation signal timer module constantly according to described ripple.

Comprise one or three comparing units in the described timer module, described ripple is preset in the described comparing unit constantly.

The invention has the beneficial effects as follows: method of the present invention adopts the mode that increases a high-priority interrupt in regularly interrupting, obtain the accurate moment of SCR commutation operation by approach based on linear interpolation, this commutation is preset at constantly in the comparing unit of timer, when the commutation moment and timer coupling timer taking place relatively interrupts, in timer comparison interrupt service subroutine, carry out SCR commutation operation, thereby realize accurate SCR commutation operation, improve the quality of rectifier output voltage; Owing to adopt the method real-time response of interrupting very fast, method of the present invention can be the expectation commutation moment and actual commutation error T constantly _{Err_C}Be controlled in the 5uS, greatly improve the ripple precision of SCR.

[description of drawings]

Fig. 1 carries out the flow chart that SCR sends out ripple in the prior art.

Fig. 2 is a flow chart of determining the Eab enabler flags among Fig. 1.

Fig. 3 is the expectation commutation moment and an actual commutation moment graph of a relation in the conventional Wave method.

Fig. 4 is input line voltage and SCR trigger sequence figure.

Fig. 5 is input vector angle and SCR commutation moment graph of a relation.

Fig. 6 is that linear interpolation method calculates accurate SCR triggering schematic diagram constantly.

Fig. 7 samples to expect the SCR commutation moment and the actual SCR commutation moment graph of a relation when high-priority interrupt is sent out ripple.

Fig. 8 be in the inventive method two each constantly concern schematic diagram.

Fig. 9 is that the wave apparatus of sending out of silicon controlled crystal brake pipe rectifier of the present invention is used schematic diagram.

[embodiment]

Below in conjunction with drawings and Examples the present invention is further set forth:

Send out the commutation error that ripple causes for solving conventional scr, realize accurate SCR commutation operation, the present invention adopts three kinds of methods, in regularly interrupting, increase a high-priority interrupt mode again, phase place and/or amplitude characteristic according to input voltage, and the trigger angle of silicon controlled crystal brake pipe, obtain the accurate moment of each silicon controlled crystal brake pipe commutation in the rectifier, this accurate commutation is preset in the comparing unit of timer constantly, when the commutation moment and timer coupling timer taking place relatively interrupts, in timer comparison interrupt service subroutine, carry out SCR commutation operation, realize accurate SCR commutation operation.

Being implemented as follows of method one:

Front SCR commutation condition (formula 4) is rewritten as:

Definition: [] for rounding operation, obviously the pass of Sector and SCR triggering is:

The relation that can draw input line voltage and Sector according to formula (6) as shown in Figure 4, wherein,

1 each line voltage zero-cross point of expression ● the expression trigger angle equals 30 SCR trigger points when spending

Can know that when the moment that Sector changes, the commutation operation need take place the SCR rectifier.Judge the variation of Sector for convenience, (θ-60 °-α) amplify 6 times, and the angle 6* (θ-60 °-α) normalize to [0～360 °] after amplifying, when 6* (θ-60 °-variation has taken place α) to be turned back to 0 Sector when spending by 360 degree, as shown in Figure 5, be input vector angle and SCR commutation moment graph of a relation, wherein

● input voltage phase angle when the SCR commutation moment zero expression of expression expectation is interrupted

(θ-60 °-α) be abscissa, (θ-60 °-α) and 6* (θ-60 °-α) all be ordinate, pairing figure illustrates respectively with bent arrow in the drawings.

For realizing that accurate SCR sends out ripple, this method increases a high-resolution timer, and software records enters the timer currency T of correspondence when regularly interrupting carrying out the AD sampling adjacent twice _T-1, T _t, obtain SCR expectation commutation timer value T constantly by linear interpolation _F, its position as shown in Figure 6, computational methods are: $T_F=T_t-\frac{{\mathrm{\&theta;}}_t}{\mathrm{\&Delta;\&theta;}}*T_s.$

Corresponding sinusoidal wave, 360 ° is one-period, when angle during greater than 360 °, need deduct 360 ° to angle, normalizes in 0 ~ 360 again.Δ θ=θ for this reason _t-θ _T-1'=θ _t'-θ _T-1, wherein, θ _T-1, θ _tAll be meant ordinate, θ _T-1'=θ _T-1-360 °, θ _t=θ t '-360 °, thereby as can be known: Δ θ=θ _t+ 360 °-θ _T-1

Owing to calculate and accurately trigger T constantly _FNeed use T _T-1, T _t, and result of calculation must be T _F≤ T _t, and this moment timer value greater than T _F, this moment is T _FBe preset in the timer comparing unit, comparison match can not take place, also just can not realize accurate SCR commutation.During specific implementation T _F+ Δ T is preset in the timer comparing unit, and the value of Δ T need guarantee that timer can take place relatively to interrupt.Because Δ T is a droop, this droop can not influence a ripple precision of rectifier, and the droop of Δ T can be compensated by the adjusting to trigger angle α in the rectifier control loop.

T _F+ Δ T is preset in the timer comparing unit, works as T _FWhen coupling takes place for+Δ T and timer, timer taking place relatively interrupt, carry out SCR commutation operation in timer comparison interrupt service subroutine, just can realize the SCR commutation accurately.Owing to adopt the method real-time response of interrupting very fast, this method can be the expectation commutation moment and actual commutation error T constantly _{Err_C}Be controlled in the 5uS, greatly improve the ripple precision of SCR, as shown in Figure 7, wherein,

Original position is regularly interrupted in zero expression ● expression expectation commutation constantly Commutation operation in the expression high-priority interrupt

The outstanding advantage of this method is: by the method for sectorization Sector, that utilizes that a timer and comparing unit just can realize three-phase SCR rectifier accurately sends out ripple.

Being implemented as follows of method two is with line voltage u _AbFor example describes:

At first write down adjacent twice and enter the timer moment T that regularly interrupts carrying out the AD sampling _T-1, T _tInput voltage u with correspondence _Ab(t-1), u _Ab(t), referring to Fig. 8;

Wherein, T _{Zero_ab}'--the timer value during uab of last cycle voltage zero-cross, T _Fire--a ripple moment of expectation, T _t--this interrupts the timer value of AD sampling, T _{Zero_ab}--the timer value T during the uab voltage zero-cross _T-1--last time interrupted the timer value of AD sampling;

When finding u _AbAnd u (t-1)＜0 _AbO'clock (t) 〉=0, the input voltage zero passage is described, utilizes accurate zero passage that the linear interpolation principle calculates input voltage T constantly _{Zero_ab}:

$T_{\mathrm{zero}\_\mathrm{ab}}=T_t-\frac{u_{\mathrm{ab}}\left(t\right)}{u_{\mathrm{ab}}\left(t\right)-u_{\mathrm{ab}}(t-1)}{T}_s---\left(7\right)$

According to adjacent twice zero passage moment T _{Zero_ab}, T _{Zero_ab}' can calculate the period T of input voltage _Period:

T _period＝T _{zero_ab}-T _{zero_ab}’………………………………………(8)

By accurate input voltage zero passage moment T _{Zero_ab}, the input voltage period T _PeriodAnd SCR trigger angle α, can calculate accurate SCR and trigger T constantly _Fire:

T _FireBe preset in the comparing unit of timer, when timer generation comparison match, enter timer and relatively interrupt, in timer comparison interrupt service subroutine, carry out SCR commutation operation, realized the accurately ripple of SCR.

Consider other phase line voltage V _Ac, V _Bc, V _Ba, V _Ca, V _Cb, V is arranged _Ab, V _Ac, V _Bc, V _Ba, V _Ca, V _Cb, totally 6 phase line voltages need same operation, and present single-chip microcomputer or DSP seldom have a timer to possess 6 comparing units.For this reason, can adopt following method during concrete operations:

Because the excursion of SCR trigger angle α is 0～120 degree, consider the natural angle of overlap of 60 degree, can know the accurate triggering moment T of any phase line voltage _FireAccurate zero crossing T with this phase line voltage _ZeroBetween can not surpass 180 degree.And V in the line voltage _Ab=-V _Ba(V _Bc=-V _Cb, V _Ca=-V _Ac), phase phasic difference 180 degree of two line voltages, two phase line voltage V of phase phasic difference 180 degree for this reason _Ab, V _Ba(V _Bc, V _Cb, V _Ca, V _Ac) can a shared comparing unit.For this reason, only need a timer to possess 3 comparing units simultaneously and just can realize that accurate SCR sends out ripple.Three comparing units by a timer are respectively to V _Ab, V _BaAnd V _Bc, V _CbAnd V _Ca, V _AcSend out ripple accurately, thereby realize an accurately ripple of three-phase SCR rectifier.When adopting the TMS320LF24xx series DSP of TI company, can be with 3 among the task manager EVA full comparing units realize rectifiers accurately send out ripple:

If need develop 12 arteries and veins SCR rectifiers, then can use an accurately ripple of 3 full comparing units realization another one 6 arteries and veins rectifiers among the another one task manager EVB:

Being implemented as follows of method three:

Adopt the capture function (CAPTURE function) of single-chip microcomputer or DSP, the input line voltage zero passage is caught constantly, the accurate zero passage of record input voltage is T constantly _ZeroRemaining ripple operation said method two is just the same, and the benefit of this method is to reduce the software work amount, and only needing increases by 3 capture units (CAPTURE unit), just can realize the accurate ripple of sending out of rectifier.

Utilize the capture function of capture unit, capture line voltage over zero T _{Zero_ab}, utilize twice adjacent voltage zero-cross T constantly _{Zero_ab}, T _{Zero_ab}' ask for the period T of input voltage _PeriodBy accurate input voltage zero passage moment T _{Zero_ab}, the input voltage period T _PeriodAnd SCR trigger angle α, calculate accurate SCR and trigger T constantly _Fire, computational methods are:

In this method, 6 arteries and veins rectifiers then adopt 6 capture units with 3 capture units, 12 arteries and veins rectifiers.Present single-chip microcomputer capture unit generally can be caught rising edge and trailing edge, also just can catch two opposite each other line voltages.

In addition, a wave apparatus of silicon controlled crystal brake pipe rectifier of the present invention, shown in the frame of broken lines among Fig. 9, this wave apparatus comprises the signal transmitting module that is used for sending to the silicon controlled crystal brake pipe of rectifier the commutation operation signal; According to the phase place and/or the amplitude characteristic of input voltage, and the trigger angle of silicon controlled crystal brake pipe, obtain in the rectifier each silicon controlled crystal brake pipe and send out ripple acquisition module constantly; With constantly, locate described signal transmitting module and send commutation operation signal timer module constantly according to described ripple; Wherein, the input of acquisition module connects the voltage input end of rectifier, its output connects the input of timer module, and the output of timer module connects the input of signal transmitting module, and the output of signal transmitting module connects the commutation operation control end of rectifier.

Wherein, comprise one or three comparing units in the timer module, send out ripple and be preset in the comparing unit constantly.

In sum,, can realize accurate SCR commutation operation, make SCR rectifier input current symmetry, reduce the bus ripple, improve the quality of rectifier output voltage, also improve the control stability of system simultaneously by method of the present invention and device.

Claims (9)

1, the Wave method of silicon controlled crystal brake pipe rectifier is characterized in that, may further comprise the steps:

101, according to the phase place and/or the amplitude characteristic of input voltage, and the trigger angle of silicon controlled crystal brake pipe, that obtains each silicon controlled crystal brake pipe in the rectifier sends out ripple constantly;

102, in the comparing unit of timer, preset described ripple constantly,, timer then takes place relatively interrupt, thereby corresponding silicon controlled crystal brake pipe is carried out the commutation operation if described ripple mates with timer constantly.

2, the Wave method of silicon controlled crystal brake pipe rectifier according to claim 1 is characterized in that, step 101 further comprises:

Sampling instant T when 201, adjacent twice AD of record samples _T-1, T _t, and (θ-60 °-α) angle value θ of the corresponding 6* of two sampling instants _T-1And θ _t, obtain by linear interpolation method $T_F=T_t-\frac{{\mathrm{\&theta;}}_t}{\mathrm{\&Delta;\&theta;}}*T_s,$ Wherein, α is the trigger angle of described silicon controlled crystal brake pipe, T _s=T _t-T _T-1, Δ θ=θ _t+ 360 °-θ _T-1

202, T _F+ Δ T sends out ripple constantly as described rectifier, and wherein, Δ T is the droop that an assurance timer can take place relatively to interrupt.

3, the Wave method of silicon controlled crystal brake pipe rectifier according to claim 2 is characterized in that, step 102 further comprises:

Described ripple is preset at constantly in the same comparing unit of timer.

4, the Wave method of silicon controlled crystal brake pipe rectifier according to claim 1 is characterized in that, step 101 further comprises:

Obtain adjacent twice zero crossing of each line voltage constantly, correspondence obtains a ripple moment of each silicon controlled crystal brake pipe in the rectifier

Wherein, T _Zero, T _Zero' representing this zero crossing moment of corresponding line voltage and zero crossing moment last time respectively, α is the trigger angle of described silicon controlled crystal brake pipe, T _Period=T _Zero-T _Zero'.

5, the Wave method of silicon controlled crystal brake pipe rectifier according to claim 4 is characterized in that, in the step 101, obtains adjacent twice zero crossing of each line voltage and constantly further comprises:

Sampling instant T when writing down adjacent twice AD sampling _T-1, T _t, and the instantaneous voltage u (t-1) of corresponding input line voltage, u (t), this zero crossing that draws input line voltage by linear interpolation method is constantly $T_{\mathrm{zero}}=T_t-\frac{u\left(t\right)}{u\left(t\right)-u(t-1)}{T}_s,$ Wherein, T _s=T _t-T _T-1In like manner, get the zero crossing moment last time T of outlet voltage _Zero'.

6, the Wave method of silicon controlled crystal brake pipe rectifier according to claim 4 is characterized in that, in the step 101, obtains adjacent twice zero crossing of each line voltage and constantly further comprises:

By capture unit, catch adjacent twice zero crossing of each line voltage constantly, the number of described capture unit is identical with the rectification pulse number of rectifier.

7, according to the Wave method of claim 4,5 or 6 described silicon controlled crystal brake pipe rectifiers, it is characterized in that, further comprise in the step 102:

Described ripple is preset at respectively in three comparing units of same timer constantly, and presets in the same comparing unit pairing ripple moment of two phase line voltages of phase phasic difference 180 degree.

8, a wave apparatus of silicon controlled crystal brake pipe rectifier comprises the signal transmitting module that is used for sending to the silicon controlled crystal brake pipe of rectifier the commutation operation signal; It is characterized in that, also comprise:

According to the phase place and/or the amplitude characteristic of input voltage, and the trigger angle of silicon controlled crystal brake pipe, obtain in the rectifier each silicon controlled crystal brake pipe and send out ripple acquisition module constantly;

With constantly, locate described signal transmitting module and send commutation operation signal timer module constantly according to described ripple.

9, a wave apparatus of silicon controlled crystal brake pipe rectifier according to claim 8, it is characterized in that: comprise one or three comparing units in the described timer module, described ripple is preset in the described comparing unit constantly.

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