KR101807400B1 - Method for driving a current sink which discharges a capacitive load - Google Patents
Method for driving a current sink which discharges a capacitive load Download PDFInfo
- Publication number
- KR101807400B1 KR101807400B1 KR1020160051162A KR20160051162A KR101807400B1 KR 101807400 B1 KR101807400 B1 KR 101807400B1 KR 1020160051162 A KR1020160051162 A KR 1020160051162A KR 20160051162 A KR20160051162 A KR 20160051162A KR 101807400 B1 KR101807400 B1 KR 101807400B1
- Authority
- KR
- South Korea
- Prior art keywords
- field effect
- effect transistor
- current sink
- time
- capacitive load
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 230000005669 field effect Effects 0.000 claims abstract description 28
- 230000001105 regulatory effect Effects 0.000 claims abstract description 24
- 230000004913 activation Effects 0.000 claims abstract description 14
- 238000007599 discharging Methods 0.000 claims abstract description 10
- 230000001276 controlling effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 description 4
- 239000003990 capacitor Substances 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/613—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in parallel with the load as final control devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D41/2096—Output circuits, e.g. for controlling currents in command coils for controlling piezoelectric injectors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/02—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing linear motion, e.g. actuators; Linear positioners ; Linear motors
- H02N2/06—Drive circuits; Control arrangements or methods
- H02N2/065—Large signal circuits, e.g. final stages
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/202—Output circuits, e.g. for controlling currents in command coils characterised by the control of the circuit
- F02D2041/2034—Control of the current gradient
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/20—Output circuits, e.g. for controlling currents in command coils
- F02D2041/2068—Output circuits, e.g. for controlling currents in command coils characterised by the circuit design or special circuit elements
- F02D2041/2075—Type of transistors or particular use thereof
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The present invention relates to a method for driving control of a regulated current sink having a load path formed by a field effect transistor (T1) and discharging a capacitive load (CL) from an activation point of time (t0) The sink is driven and controlled by the control signal Isoll for a predetermined period before the activation point t0 and the amplitude of the control signal is controlled by the control circuit OP, R1, C1, R2, R3 to the threshold voltage In which case the predetermined period of time is sufficient to apply the regulating characteristics of the regulating circuits OP, R1, C1, R2, R3 and the gate voltage UG, Source-capacitance of the field effect transistor T1 and the gate voltage UG is selected to have at least the value of the threshold voltage Uth of the field effect transistor T1 at the activation point in time t0.
Description
The present invention relates to a method for driving and controlling a regulated current sink having a load path formed by a field effect transistor and discharging a capacitive load from an activation point of time.
Such a current sink is known from WO 2007/009862 A1. The regulated current sinks known in this publication are used to cause residual discharge of the piezo actuator within the fuel injection valve for an automotive combustion engine.
Such a piezo actuator is typically charged to a predetermined voltage through a switching regulator at a precisely predetermined time to open the fuel valve so that the fuel quantity as accurately as possible is accurately set at a precisely predetermined time for a particular crankshaft angle, It can be injected into the combustion chamber of the engine. In order to close the fuel valve again, the piezo actuator must be discharged again, in which case it is important that the discharge is made as completely as possible so that the subsequent accurate filling can be effected subsequently.
Discharging is likewise accomplished first through the switching regulator, so that the electrical energy stored in the piezo actuator can at least partially be reversely charged back into the accumulation capacitor again. However, such a switching regulator may have drawbacks in discharging the piezo actuator due to structural conditions, so that the discharge current falls to an excessively small value at the end of the discharge process. Thus, as described in WO 2007/009862 A1, by the end of the discharge, the discharge process is transferred to the dissipative path by the switching regulator.
This path is a regulated current sink having a substantially field effect transistor whose load current is measured through a shunt resistor connected in series with the field effect transistor and through a regulating circuit , The gate voltage of the field effect transistor is set so that the discharge current corresponds to a predetermined value.
In WO 2007/009862 A1, the control circuit is formed so as to be switchable so that the piezo actuator can be the first to have a relatively high residual current, and at a later point in time, .
The problem with such regulated current sinks with field effect transistors, however, is that all transistors individually require different gate voltage / gate charge due to component tolerances and at the correct temperature. Thus, and due to the tolerances of the remaining parts of the regulator, the duration between activation and preparation of the current sink varies with the device and temperature, even though the drive control is always done in the same type and manner.
The problem is solved by a method for driving control a regulated current sink having a load path formed by a field effect transistor and discharging a capacitive load from an activation point of time, wherein the current sink is pre- And the amplitude of the control signal is sufficient to apply a gate voltage to the field effect transistor that is slightly higher than the threshold voltage by the adjustment circuit, in which case the pre- The control characteristics of the circuit and the gate-source-capacitance of the field effect transistor, and at the time of activation the gate voltage is selected to have at least the value of the threshold voltage of the field effect transistor.
More specifically, the current sink is switched on in a manner consistent with the present invention, at a point in time that the regulator can oscillate before the original activation point. At this time, the setting value was selected to be the earliest, and all the tolerances were selected to be large enough to cause the regulator to vibrate to its small target value at the activation point. Then, if the actual discharge current has to be transferred to the current sink, the field effect transistor is already in its active area, that is, it is already fully reaching the threshold voltage of the field effect transistor. Hence, until the threshold voltage of the field effect transistor is reached, an unknown gate charge is no longer needed, but only additional charge is needed to be able to sustain the discharge current. Therefore, the desired current flow is set almost directly.
Particularly preferably, the method according to the invention is used when the regulating circuit has the regulating characteristic of the integrating method, because this way always gives the time between the application of the specific set value and the transient oscillation of the output value There is a delay.
The current sink is used to discharge any capacitive load through the method according to the present invention, but is also particularly preferred for use in discharging piezo actuators.
The present invention will be described in detail below with reference to embodiments associated with the drawings. In the drawing:
Figure 1 shows a prior art controlled current sink;
Figure 2 shows the switching characteristics of the regulated current sink shown in Figure 1; And
FIG. 3 is a diagram showing a drive control method according to the present invention of the above-described regulated current sink. FIG.
According to Figure 1, the regulated current sink is formed by a field effect transistor T1 in a known manner, the drain terminal of which is connected to the capacitive load CL to be discharged, Is connected to the reference potential through the shunt resistor R3. The gate terminal of the field effect transistor T1 is driven and controlled by the output of the operational amplifier OP and the noninverting input of the operational amplifier OP is supplied with a reference voltage Uref representing the set value for the discharging current Is provided. The inverting input of the operational amplifier OP is connected to the output of the operational amplifier OP through the series circuit of the first resistor R1 and the capacitor C1 and the output of the operational amplifier OP is connected to the output of the operational amplifier OP through the second resistor R2. Is connected to the source terminal of the transistor T1. As a result, the control circuit of the current sink is formed as a PI-regulator. However, basically a regulating circuit with other regulating characteristics is also used in the manner according to the invention.
As shown in Fig. 2, when the setting value for the sudden discharge current Isoll is provided to such an adjusting circuit according to Fig. 1 at one time point t0, the output voltage of the operational amplifier OP increases, As a result, the gate voltage at the field effect transistor T1 reaches the threshold voltage Uth of the field effect transistor T1 at one time point t1 due to the characteristic of the integration method of the control circuit, Passes through the field effect transistor T1 and thereby increases approximately linearly until the discharge current for the capacitive load CL increases to a set value.
However, due to the tolerances of the components of the regulating circuit and due to the variation of the residual charge in the capacitor C1 and the variation of the gate source capacitance of the field effect transistor T1, The period applied to the regulated current sink can not be predicted sufficiently accurately.
Therefore, in the method according to the present invention, the voltage Uref corresponding to the previously set small set current Isoll at the time point t2, which is sufficiently long before the original drive control time point t0, Is supplied to the regulated current sink, after which the gate voltage of the field effect transistor T1 is gradually increased to the threshold voltage Uth, and then a predetermined small discharge current Isoll begins to flow.
This current does not have a significant effect on the discharge process of the capacitive load in the form of a piezo actuator, but is small enough to bring the field effect transistor T1 into a prescribed state. Then, when the desired high discharge current at the original activation time t0 is set as a new set value Isoll, the desired discharge current having a known and defined profile can be set very quickly.
The time interval between the application of the small set current at the time t2 and the original activation time t0 is substantially equal to the charge state of the gate source capacitance of the field effect transistor T1, Depends on the state of charge and the tolerances of the parts used. These can be determined experimentally and a sufficiently large time interval can be chosen for the worst-case-situation.
Claims (3)
Wherein the current sink is driven and controlled by a control signal Isoll for a predetermined period before the activation time t0 and the amplitude of the control signal is controlled by the control circuit OP, R1, C1, R2, Is sufficient to apply a gate voltage UG above the voltage Uth to the field effect transistor T1 where the predetermined period of time is less than the regulating characteristic of the regulating circuit OP, R1, C1, R2, R3 And the gate-source-capacitance of the field effect transistor T1 and the gate voltage UG at the activation time t0 is selected to have at least the value of the threshold voltage Uth of the field effect transistor T1 , And a controlled current sink for discharging the capacitive load.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102015211400.7A DE102015211400B3 (en) | 2015-06-22 | 2015-06-22 | A method of driving a current sink discharging a capacitive load |
| DE102015211400.7 | 2015-06-22 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR20160150578A KR20160150578A (en) | 2016-12-30 |
| KR101807400B1 true KR101807400B1 (en) | 2017-12-08 |
Family
ID=56410540
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR1020160051162A KR101807400B1 (en) | 2015-06-22 | 2016-04-26 | Method for driving a current sink which discharges a capacitive load |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR101807400B1 (en) |
| DE (1) | DE102015211400B3 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102018125272A1 (en) * | 2018-10-12 | 2020-04-16 | Valeo Siemens Eautomotive Germany Gmbh | Device and method for discharging an intermediate circuit capacitor, converter and vehicle |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013060630A1 (en) | 2011-10-24 | 2013-05-02 | Continental Automotive Gmbh | Method and device for ascertaining the temperature of a fuel injection valve, and method for regulating the temperature of a fuel injection valve |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5706183A (en) * | 1994-06-27 | 1998-01-06 | Matsushita Electric Works, Ltd. | Inverter power supply with single discharge path |
| US5589794A (en) * | 1994-12-20 | 1996-12-31 | Sgs-Thomson Microelectronics, Inc. | Dynamically controlled voltage reference circuit |
| DE102005033708B3 (en) * | 2005-07-19 | 2007-02-08 | Siemens Ag | Device for charging and discharging at least one piezoelectric actuator for an injection valve of an internal combustion engine |
-
2015
- 2015-06-22 DE DE102015211400.7A patent/DE102015211400B3/en active Active
-
2016
- 2016-04-26 KR KR1020160051162A patent/KR101807400B1/en active IP Right Grant
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013060630A1 (en) | 2011-10-24 | 2013-05-02 | Continental Automotive Gmbh | Method and device for ascertaining the temperature of a fuel injection valve, and method for regulating the temperature of a fuel injection valve |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20160150578A (en) | 2016-12-30 |
| DE102015211400B3 (en) | 2016-08-04 |
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