CN1024616C - Procedure for selection of bridge or bridge section in rectifier bridge unit, and bridge selector unit designed for implementing procedure - Google Patents
Procedure for selection of bridge or bridge section in rectifier bridge unit, and bridge selector unit designed for implementing procedure Download PDFInfo
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- CN1024616C CN1024616C CN89106250A CN89106250A CN1024616C CN 1024616 C CN1024616 C CN 1024616C CN 89106250 A CN89106250 A CN 89106250A CN 89106250 A CN89106250 A CN 89106250A CN 1024616 C CN1024616 C CN 1024616C
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Abstract
The selection process of a bridge or a part of the bridge in a rectifier bridge device and the bridge selection device for realizing the process. The selection of the bridge or the part of the bridge is based on the direction of the actual current value (Ia) when the actual current elementally is a non-zone value, and based on the reference value when the actual current elementally is zone and the reference current is not zone, or based on the selected signal for controlling the bridge or the part of the bridge during the zone-current period when the actual value and the reference value of the current are all zero; and the signal leads the bridge control signal to be alternately connected on the bridge or the part of the bridge.
Description
The present invention relates to the system of selection of bridge circuit in the rectifier bridge unit or bridge circuit part and design in order to realize the bridge path selecting device of this method, wherein rectifier bridge unit comprises that described bridge circuit or bridge circuit part are made up of some solid-state switches at least to the bridge circuit of a direction conducting or bridge circuit part and another bridge circuit or bridge circuit part to the other direction conducting.
At present, it is all too complicated to be used for the logical circuit that the thyratron rectifier bridge circuit selects.And they have long time-out unavoidably around bridge circuit changes point.
The purpose of this invention is to provide the system of selection of bridge circuit in a kind of rectifier bridge unit or bridge circuit part and design in order to realize the bridge path selecting device of this method.
The system of selection of bridge circuit and bridge circuit part in the rectifier bridge unit of the present invention, rectifier bridge unit comprises to the bridge circuit of a direction conducting or bridge circuit part and bridge circuit or bridge circuit part to the other direction conducting, described bridge circuit or bridge circuit part are made up of some solid-state switches at least, system of selection is characterised in that: the direction of the actual current value (Ia) when selection is essentially nonzero value based on actual current, based on actual current is zero and the reference current value (Ir) of reference current value when non-vanishing substantially substantially, or when actual current value and reference current value are zero basically, then based on controlling the control signal that bridge circuit or bridge circuit are partly selected during the zero current, this signal guidance bridge circuit control signal is alternately received bridge circuit or bridge circuit part.
The bridge path selecting device that confession of the present invention selects bridge circuit to use in rectifier bridge unit, described bridge circuit has some solid-state switches, described rectifier bridge unit comprises load, DC load circuit, make the DC load electric current along first electric bridge of a direction conducting and make this load current second electric bridge of conducting in opposite direction, and described bridge path selecting device comprises:
In order to direction and the big or small comparison means that detects actual current and reference current,
In order to producing the logic device of the signal that the control bridge circuit selects,
In order to regulating the deferred mount and the control device of the signal that described control bridge circuit selects according to described solid-state switch, and
In order to during zero current condition, to produce the device of the signal of controlling the bridge circuit selection.
Selection logic of the present invention makes the operating delay of relevant bridge circuit change significantly to reduce.
Below with reference to accompanying drawing, more say by example and carefully to describe the present invention.
Fig. 1 represents four-quadrant rectifier bridge circuit device.
Fig. 2 represents that the direct current machine in the matrix current adjustment circuit drives.
Fig. 3 illustrates bridge circuit selection principle.
Fig. 4 illustrates the modulator circuit principle.
Figure 5 shows that bridge path selecting device.
Fig. 1 represents the main circuit of four-quadrant rectifier device, and it uses the switch element (GTO, transistor, field effect transistor, IGBT, SIT or the like) of air cock control.Phase voltage is UR, and the three-phase main supply of US and UT is received two the bridge circuit S1 and the S2 of rectifier.Coil L1-L3 and L and capacitor C1 '-C3 ' and C are filter element.From main line to DC circuit V+ with V-and to the first bridge circuit S1 of the direction conducting of load, by transistor T 1-T6, diode D1 '-D6 ' of being connected with the transistor reverse parallel connection, and form with booster diode D1 " D6 " that transistor-diode (led) module is connected in series.These booster diodes guarantee that the bridge circuit operation is not subjected to the influence of inside modules diode.Similarly, second bridge circuit is made up of transistor T 7-T12, diode D7 '-D12 ' and booster diode D7 " D12 ", and with the direction conducting to main line from DC circuit.Four-quadrant construction here context means the both direction that is suitable for direct current, and the voltage of DC circuit can be plus or minus, that is, power supply can flow to load or flow to main line from load from main line.
Supposing in the affiliated driving stage of bridge circuit has a conventional current Adjustment System, for example, and similar system as shown in Figure 2.This system's penetralia control loop comprises the control that motor current is reached the torque that is directly proportional with this electric current.Measure motor current Id with two-way Hall element H.With 1 pair of difference channel the electric current I a that surveys with compare by the given current value I r that is provided with of speed control, so differential signal passes to PI type current regulator 2.The output of current regulator is by current-limiting circuit 3 restrictions, and the modulation index Ur of definite modulation circuit 4 promptly, the VD of bridge circuit.
Considering that speed control does the time spent, suppose current regulator correctly tuning and motor M one big inertia mass is arranged.Under this class situation, electric current is adjusted loop and motor M and is considered to that available single integrating device replaces.Like this, so long be used as one to it and have single time constant and can be easier by the device of controlling by first feedback speed signal and the P controller 6 of difference channel 9.
PI type speed control 7 is so tuning, i.e. the above-mentioned time constant of its cancellation, and the voltage of the critical tuning tachymeter Tm of all the other closed installation eliminations that are made of (in the device 8) time constant T.This installs remaining two time constants can be with increasing the weight of fiducial value n
rCircuit (D
2) 10 eliminated.Produce actual value n by difference channel 11
aWith fiducial value n
rPoor.
The reference value I r that bridge path selecting device 12 utilizes actual current value Ia and obtains from this device.Fig. 3 represents to select the principle of logic.Size according to direct current Id actual value and fiducial value, this logic is the switch element control impuls R+, R-, S+, the S-that obtain from pulse-width modulator 15, T+ and T-(structure are as shown in Figure 4), perhaps be directed to the transistor T 1-T6 of bridge circuit S1, perhaps be directed to the transistor T 7-T12 of bridge circuit S2.
When being lower than certain determined value, its size of direct current by load just becomes pulsation.This has just reduced the gain of device, and reference voltage is dropped under the load balance required voltage.This unbalance condition can change moment at bridge circuit and cause big current impulse.For this reason, when bridge circuit changed, difference channel 13 was by applying an other reference voltage Ut who obtains via switch 14, changed reference voltage with the direction and the progressive mode of safety.
Bridge path selecting device comprises comparison circuit 16 that actual and reference value I a and Ir are compared and 17 and oscillating circuit 18.In addition, this device has AND gate 19 and 20, OR-gate 21 and the selector switch 22 that is used for the amplifying device 23 and 24 that amplifies control impuls is selected.
Modulator circuit as shown in Figure 4 by two contain that sinusoidal wave rise and fall limit forms 120.Interval EPROM28a and 28b.With 60.These EPROM contents are read in phase shift.Determine to read the frequency of modulation benchmark with voltage-controlled oscillator (VCO) 25, so also can determine the phase current frequency.To modulate transformation of criterion for the analog quantity form of amplitude adjusted A can be provided with D/ A converter 29a and 29b, and be used for the comparator 31 that the corresponding carriers that fiducial value and device 30 obtain is made comparisons is produced the preceding modulating pulse of sending out.6 dividers 27 provide and show 6 60.The information which is being handled in the modulating range.These three information are with relatively 31 output is as the address date of EPROM32, and it comprises the corresponding control data of all assembled state with the control of bridge circuit switch element.
In Fig. 3, the transistor with bridge circuit S1 correspondence is arrived in the control modulating pulse, if
A) survey the direct current direction for just (Ia=+) if or:
B) actual current value be zero but fiducial value for just, (Ia=0andIr=+); If perhaps
C) reality of electric current and fiducial value are zero, but the output of pierce circuit 18 effective (Ia=0andIr=0 and Osc=1).
Under other all situations, the transistor of modulating pulse guiding and bridge circuit S2 correspondence.Bridge circuit is selected based on following condition.
A) in bridge circuit S1, electric current can only flow with forward (switch forward), promptly also returns by bridge circuit S2 in the opposite direction from positive main line V+ to load.In other words, selected bridge circuit must be that an immediate current flow direction is positive bridge circuit.
B) if actual current value is zero, bridge circuit changes in the time of can not producing any principal voltage transition, and two bridge circuits can be chosen one wantonly.So under the zero current situation, logic is always at those and current reference value instantaneous direction, promptly current regulator is right after guiding in those bridge circuits of sense of current unanimity and selects one.
C) when actual and reference current value all are zero, one of oscillating circuit 18 alternate selection bridge circuit S1 and S2.For the output of the integrator of avoiding current regulator has the drift of any direction, under the zero current situation, change bridge circuit repeatedly.Occur if any drift, current adjusting device sends back to bridge circuit with integrator output and changes the required value of moment zero current.Constantly change bridge circuit and guaranteed that also little electric current flows, and might guarantee that current path is closed in the main circuit in DC circuit.Required oscillator frequency is taken at the adjusting of adjuster and drift speed thereof.
Bridge circuit selects logic to be achieved with similar circuit as shown in Figure 5.In this circuit and the voltage U Ia that is directly proportional of actual current value compare with voltage corresponding to positive and negative zero current level, the voltage of back is produced by comparator A1 and A2 and resistor R 1-R4.Between these reference levels (Ia=0), NOR gate N1 is output as height as actual current value.Be just (Ia=+) as actual current value, promptly be higher than positive reference voltage, the output of comparator A1 also is in high state so.Use voltage U Ir that identical method and current reference value be directly proportional and the zero current level that produces by comparator A3 and A4 and resistor R 7-R10 to compare.If the value of setting is between zero current level (Ir=0), NOR gate N2 is output as height so, if the value of setting of electric current is just (Ir=+), comparator A3 is output as height so.The required oscillator of this logic is by amplifier A5, and resistor R 13-R15 and capacitor C1 form.Resistor-diode pair R5-D1, R6-D2, R11-D3, R12-D4 and R16-D5 are used to make voltage to be suitable for the acceptable level of gate circuit.That is, stop the negative voltage passage.
As actual current value be zero and fiducial value for just, then NOT-AND gate N3 is output as height.If current actual value and the value of setting both are zero and oscillator electrical equipment is output as height, then a N4 is output as height.NOR gate N5 combination, the condition that bridge circuit activates: if current value is set for just, (A1 is output as height) or door N3 or a door N4 are output as height, and a N5 is output as low so.In other cases, door N5 is output as height.
If the output step-down of door N5, after the delay of being determined by RC circuit R17-C2 and Si Mite (Schmit) trigger N6, the corresponding input of NOT-AND gate N9 uprises so.Under the reverse situation, because diode and resistor R 17 are connected in parallel, signal does not postpone to pass through almost to have.If external control line ON/OFF is high, the output step-down of NOT-AND gate N9, so just modulating pulse is led the switch element of bridge circuit S1.
When the output of door N5 uprises, inverter N7 is output as low, as previously mentioned, be connected the output of resistor R 18, diode D7, capacitor C3 and this schmitt trigger N8 door 10 afterwards, only seldom postponing step-down afterwards, if the external control line is high, just the modulating pulse switch element corresponding that lead then with bridge circuit S2.
In other words, when door N5 is output as when low, modulating pulse is directed to bridge circuit S1; And be output as when high as a door N5, allow then modulating pulse to be directed to bridge circuit S2 as the external control line.When bridge circuit changes, prevent modulating pulse arbitrary bridge circuit that leads in during determining by delay circuit, guaranteeing before other bridge circuit activates, this bridge circuit is closed and is changed preceding its switch element and be in conducting state.
It is evident that to being familiar with this professional people different embodiments of the present invention is not limited to each example discussed above, changed but replace in the claim scope below.
Claims (11)
1, the system of selection of bridge circuit and bridge circuit part in the rectifier bridge unit, rectifier bridge unit comprises to the bridge circuit of a direction conducting or bridge circuit part and bridge circuit or bridge circuit part to the other direction conducting, described bridge circuit or bridge circuit part are made up of some solid-state switches at least, system of selection is characterised in that: actual current value (I direction a) when selecting to be based on actual current and being essentially nonzero value, based on actual current is zero and the reference current value (I r) of reference current value when non-vanishing substantially substantially, or when actual current value and reference current value are zero basically, then based on controlling the control signal that bridge circuit or bridge circuit are partly selected during the zero current, this signal guidance bridge circuit control signal is alternately received bridge circuit or bridge circuit part.
2, according to the method for claim 1, it is characterized in that: during zero current, the signal of control bridge circuit or the conversion of bridge circuit part is the pulse form signal of constant frequency, a level guiding control impuls of this signal is to first bridge circuit (S1) or bridge circuit part, and another level then guides control impuls to arrive another bridge circuit (S2) or bridge circuit part.
3, according to the method for claim 1, it is characterized in that: when the direction of reality or reference current value for just selecting first bridge circuit (S1) or bridge circuit part during to load (M) from the anode (V+) of DC circuit, just selecting second bridge circuit (S2) or bridge circuit part under the situation on the contrary.
4, according to each method among the claim 1-3, it is characterized in that: form by the difference of the actual value of electric current and fiducial value and for producing the needed reference voltage of solid-state switch control signal, be by when bridge circuit changes, apply one with progressive mode and add that reference signal (Ut) changes.
5, a kind of confession bridge path selecting device of selecting bridge circuit to use in rectifier bridge unit, described bridge circuit have some solid-state switch (T by modulation signal control
1-T
12), described rectifier bridge unit comprises load, DC load circuit, make the DC load electric current along first bridge circuit (S1) of a direction conducting and make this load current second bridge circuit (S2) of conducting in opposite direction, it is characterized in that described bridge path selecting device comprises:
In order to direction and the big or small comparison means (16 that detects actual current (Ia) and reference current (Ir), 17), connect described comparison means in order to produce the logic device (19-21) of the signal of controlling the bridge circuit selection, and oscillator (18), at described actual current (Ia) is timing, perhaps the value of described actual current is zero but the value of described reference current (Ir) is timing, perhaps described actual current and reference current are zero but the output of this oscillator when effective, modulating pulse is directed into described first bridge circuit (S1), and then modulating pulse is directed into described second bridge circuit (S2) in other cases.
According to the bridge path selecting device of claim 5, it is characterized in that 6, described bridge path selecting device also has a bridge circuit to select logical circuit, described bridge circuit selects logical circuit to comprise:
In order to during zero current condition, to produce first logic device (NI-N4) of the signal of controlling the bridge circuit selection; And
Be connected with described first logic device, in order to regulate second logic device as deferred mount and control device (N9, N10) of the signal that described control bridge circuit selects according to the virtual condition of described solid-state switch.
7, according to the bridge path selecting device of claim 5, it is characterized in that: the described device that produces the signal of control bridge circuit selection during zero current condition has an oscillator (18) that produces the pulse form signal of constant frequency, variation in order to control bridge circuit or bridge circuit part during zero current condition, a kind of level of described signal is directed to first bridge circuit (S1) or bridge circuit part with control impuls, and another kind of level then is directed to control impuls another bridge circuit (S2) or bridge circuit part.
8, according to the bridge path selecting device of claim 5, it is characterized in that: described comparison means has comparator circuit (A1-A4), is used for amount (UIa-UIr) that actual value and fiducial value with electric current are directly proportional and compares with amount corresponding to positive and negative zero current level.
9,, it is characterized in that describedly containing in order to the device that produces the described signal that the control bridge circuit selects according to the bridge path selecting device of claim 6:
First gate circuit that is used to produce the logical signal of indicating the establishment of zero current condition is to (N1, N2), another gate circuit is to (N3, N4), the former produces logical signal according to the actual value of electric current and fiducial value and the latter produces logical signal according to the actual value of electric current and fiducial value and oscillator signal, and
Be used to produce the 3rd gate circuit (N5) that bridge circuit is selected signal.
10, according to the bridge path selecting device of claim 6, it is characterized in that: described deferred mount contains delay element (R17, C2, N6, R18, C3 N8) is used to produce with bridge circuit or bridge circuit and partly changes relevant delay to postpone the connection of described switch, and element (D6 D7) is used for forbidding turn-offing with described switch the effect of relevant described delay element.
11, according to the bridge path selecting device of claim 6, it is characterized in that: described control device comprise gate circuit (N9, N10), allow to control signal to bridge circuit (S1, S2) or the transmission of bridge circuit part adopt outside control.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI891058 | 1989-03-06 | ||
| FI891058A FI891058A (en) | 1989-03-06 | 1989-03-06 | FOERFARANDE FOER VAL AV EN BRYGGA ELLER DEL DAERAV I EN LIKRIKTARBRYGGENHET SAMT EN BRYGGVAELJARENHET FOER TILLAEMPANDE AV FOERFARANDET. |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1045492A CN1045492A (en) | 1990-09-19 |
| CN1024616C true CN1024616C (en) | 1994-05-18 |
Family
ID=8528001
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN89106250A Expired - Fee Related CN1024616C (en) | 1989-03-06 | 1989-07-28 | Procedure for selection of bridge or bridge section in rectifier bridge unit, and bridge selector unit designed for implementing procedure |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN1024616C (en) |
| FI (1) | FI891058A (en) |
-
1989
- 1989-03-06 FI FI891058A patent/FI891058A/en not_active Application Discontinuation
- 1989-07-28 CN CN89106250A patent/CN1024616C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1045492A (en) | 1990-09-19 |
| FI891058A (en) | 1990-09-07 |
| FI891058A0 (en) | 1989-03-06 |
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