WO2005067136A1 - 電流制限回路およびモータドライブ回路 - Google Patents
電流制限回路およびモータドライブ回路 Download PDFInfo
- Publication number
- WO2005067136A1 WO2005067136A1 PCT/JP2005/000117 JP2005000117W WO2005067136A1 WO 2005067136 A1 WO2005067136 A1 WO 2005067136A1 JP 2005000117 W JP2005000117 W JP 2005000117W WO 2005067136 A1 WO2005067136 A1 WO 2005067136A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- circuit
- reference voltage
- current
- power transistor
- output
- Prior art date
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- 230000005284 excitation Effects 0.000 description 17
- 238000010586 diagram Methods 0.000 description 6
- 230000003111 delayed effect Effects 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0822—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in field-effect transistor switches
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P8/00—Arrangements for controlling dynamo-electric motors rotating step by step
- H02P8/12—Control or stabilisation of current
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
Definitions
- the present invention relates to a current limiting circuit and a motor drive circuit, and more particularly, to a current limiting circuit and a motor drive circuit.
- the present invention relates to a current limiting circuit that can protect the current and can continue to be used as a driver IC.
- a bipolar drive stepping motor driver (pulse motor driver) is a one-phase drive
- the protruding rotor is rotated by a predetermined rotation angle.
- the driver that supplies the drive current for exciting each stator has a power transistor (output transistor) corresponding to each phase in series with the coil (excitation coil) connected to the power supply line and wound on the stator. Is provided in each. When the power transistor provided for each phase is turned ON / OFF at a predetermined timing, the stator is sequentially excited and the stepping motor is driven.
- the drive current sequentially increases during the ON period due to a transient phenomenon of a predetermined time constant determined by the inductance of the exciting coil of the phase and the impedance of the power transistor and the like!].
- the power transistor is turned on and turned off after a predetermined period, so that the power transistor is controlled so that no overcurrent flows. Therefore, each phase of the power transistor is normally driven by shobbing with a logic value pulse of "H" (HIGH level) and "L" (LOW level) to be ONZOFF.
- an overcurrent protection circuit of this type of driver includes a current detection circuit that detects an output current and an overcurrent detection circuit that stops driving a power transistor. And a circuit.
- the current detection circuit is usually provided in series with the power transistor.
- the overcurrent detection circuit operates according to a detection signal from the current detection circuit obtained when the output current value of the output stage power transistor becomes an overcurrent equal to or more than a predetermined value, and limits the output current value.
- Patent Document 1 JP-A-11-112313
- the current limiting circuit normally compares the detection voltage signal of the current detection circuit with a reference voltage by a comparator and stops driving the power transistor when the reference voltage is exceeded. If the circuit that generates the reference voltage fails, the current limiting circuit does not work, and there is a problem that the power transistor is destroyed. Therefore, an overcurrent protection circuit is separately required.
- the reference voltage generating circuit for detecting the specified current value (limited current value) by the current limiting circuit is externally provided to the driver IC. This is because the specified current value detection voltage varies according to the variation in the characteristics of the power transistor.By adjusting this voltage externally, the current value to be limited is adjusted to a value that meets the design specifications. It is necessary to adjust.
- connection failure and disconnection of this external circuit are more likely to occur than the circuit inside the IC.
- the current limiting circuit does not work and the power transistor is turned on. .
- the overcurrent protection circuit that is provided separately detects the overcurrent of the output current that flows when this switch is ON. Normally, the overcurrent protection circuit is used continuously to stop the operation as a driver IC. Cannot be used as a driver. Particularly, in the case of a driver such as a motor drive circuit, the driver does not operate simply due to a failure of the circuit that generates the reference voltage, and the motor also does not operate. Therefore, there is a problem that the mechanism or the entire device is sometimes wasted.
- An object of the present invention is to solve such a problem of the prior art, and to prevent occurrence of overcurrent when an external reference voltage generation circuit for detecting a specified current value fails.
- the purpose of the present invention is to provide a current limiting circuit or a motor drive circuit that can protect a power transistor and continuously use it as a driver IC.
- a current limiting circuit or a motor drive circuit has a configuration in which an output current detection circuit is provided in series with a power transistor, and a comparator and a first reference voltage generation circuit are provided. And a second reference voltage generating circuit, the detection signal obtained by the output current detecting circuit when the output current of the power transistor reaches a predetermined specified value, and the detection signal obtained from the first reference voltage generating circuit.
- the comparator generates a control signal for stopping the driving of the power transistor for a predetermined period according to the first reference voltage, and outputs the signal when the output current of the power transistor reaches a predetermined value exceeding a specified value.
- the comparator generates a control signal in accordance with the detection signal obtained by the current detection circuit and the second reference voltage obtained by the second reference voltage generation circuit.
- Reference voltage onset production circuit is external to the IC, Ru der which the second reference voltage generating circuit is incorporated in IC.
- the second reference voltage generation circuit since the second reference voltage generation circuit is built in the IC, the second reference voltage generation circuit for detecting the specified current value fails when the second reference voltage generation circuit fails.
- the current is limited by the voltage generation circuit, and overcurrent can be prevented to protect the power transistor.
- the second reference voltage generation circuit built into the IC is not an external component, connection failures and disconnections hardly occur. Therefore, if this IC is surely protected and the power is set to a value slightly higher than the first reference voltage so that there is no problem in continuously operating the predetermined value as a driver IC, the driver IC can be used. There is no problem in operation as. Therefore, this IC can be continuously used as a driver without replacing the first reference voltage generation circuit of the externally mounted component.
- the voltage to be generated by the first reference voltage generating circuit can be easily determined if the voltage to be generated can be checked through the connection terminal. It is easy to replace and return to a normal operating state. In this case, the voltage to be generated by the first reference voltage generation circuit can easily be obtained from the voltage of the second reference voltage generation circuit.
- the specified current value here corresponds not to overcurrent protection but to a limit current value (design value) that limits the current value to a certain current value or less when the motor drive circuit is driven by shoving. .
- the voltage of the second reference voltage generation circuit has both overcurrent protection and current limitation.
- the overcurrent protection circuit is originally designed to prevent destruction as an IC.
- the voltage of the second reference voltage generation circuit is reduced to the current limit by the voltage of the first reference voltage generation circuit.
- the value close to the limiting current value is higher than the upper limit value of the product variation of the voltage of the externally attached first reference voltage generating circuit and is equal to or lower than the maximum rated current value of the power transistor. I just need.
- the current limit value due to the voltage of the second reference voltage generating circuit is a current value exceeding the specified current value at this time, but the range in which no problem occurs even if the power transistor continues to drive the motor. It is in. For example, this is preferably in the range of approximately 3% to 10% higher than the current value at which the current is limited.
- FIG. 1 is a block diagram mainly showing a single-phase driving circuit of a bipolar driving stepping motor driver according to an embodiment to which the current limiting circuit of the present invention is applied
- FIG. 2 is a diagram showing the current limiting circuit
- 3 is a circuit diagram of a comparator in FIG.
- reference numeral 10 denotes a bipolar driving stepping motor driver IC having four excitation coils.
- current output circuits la, lb, lc, Id are provided, each of which is connected to the excitation coil 11a, llb, 11c, lid of the stepping motor 11, respectively, and each excitation coil 11a, lib, Flywheel diodes D are connected in parallel to 11c and lid, respectively. Since the current output circuits la, lb, lc, Id are each composed of the same circuit, the details are shown only in the current output circuit la. Hereinafter, the current output circuit la will be described, and the current output circuits lb, lc, and Id are the same, and a description thereof will be omitted.
- Reference numeral 12 denotes a power supply.
- the current output circuit la has an N-channel MOSFET power transistor Tr.
- the drain of the lower transistor Tr is connected to the output terminal 2a, and the excitation current is output to the output terminal 2a.
- the source of the power transistor Tr is connected to the output current detection resistor Rs attached outside the IC via the terminal 2e, and is grounded via this.
- the output current of the output terminal 2a is a current that sinks from the exciting coil 11a to the output terminal 2a.
- the current limiting circuit 3 includes an amplifier 4 for multiplying X2, a comparator 5, a first reference voltage generating circuit 6a, and a second reference current generating circuit 6b.
- the amplifier 4 is connected between the terminal 2e and the (1) input terminal of the comparator 5.
- the reference voltage generation circuit 6a is connected to the (+) input terminal of the comparator 5 via the terminal 2c, and is provided outside the IC. As a result, the reference voltage generating circuit 6a applies the reference voltage VREF to the (+) input terminal of the comparator 5.
- the reference voltage generating circuit 6b is provided inside the IC, is connected to the (+) input terminal of the comparator 5, and connects the reference voltage VR (VR> V REF) to the (+) input terminal of the comparator 5.
- the reference voltage VR is slightly higher than the reference voltage VREF without any problem when the stepping motor driver IC 10 operates using the reference voltage VR as the reference voltage.
- This reference voltage VR is close to the current limit value due to the reference voltage VREF as described above.
- the voltage is such that the limit current is applied in a range of 3% to 10% higher than the current value that limits the current in the design. It is sufficient if the value is above the upper limit value of the product variation in the reference voltage VREF of the external reference voltage generation circuit 6a and lower than the maximum rated current value of the power transistor.
- the phase excitation signal G (“H”) is applied to the AND gate 9 from a phase excitation signal generation circuit (not shown).
- a phase excitation signal generation circuit not shown.
- the gate thereof is turned on. Is closed.
- the phase excitation signal G (“H") applied to the gate of the power transistor Tr is blocked, and the power transistor Tr is turned off at this time.
- the voltage Vs becomes the ground potential
- the output of the comparator 5 detection pulse S
- the detection pulse S is a control signal for turning off the power transistor Tr.
- the detection pulse S ("L") is also applied to the timer circuit 7a, and generates a shoving pulse on the RS flip-flop 8 after a predetermined time. That is, a pulse P ("H") is applied to the internal delay circuit 7 via the timer circuit 7a and the internal delay circuit 7 via the inverter 7b after a fixed time after the power transistor Tr becomes OFF. In addition, pulse P ("H") is applied to the D terminal of RS-flip-flop 8 without delay.
- the internal delay circuit 7 generates a falling trigger pulse in response to the rising of the pulse P.
- "H" that is, "1” is latched in the RS-flip-flop 8
- the RS-flip-flop 8 counts the time of the timer circuit 7a.
- the gate of Andgate 9 opens. Then, the AND condition with the phase excitation signal G ("H") is satisfied, and the drive current is supplied to the excitation coil 1 la by the power transistor Tr, and the current increases!
- the timer circuit 7a drops the "H” tibbing pulse P to "L” for a certain period of time.
- the timer circuit 7a generates the "H” tibbing pulse P to generate an RS flip-flop. Set “1” to 8 and hold gate 9 open. Therefore, when the phase excitation signal G ("H") is generated, the AND condition is satisfied, and the drive current is supplied to the excitation coil 11a by the power transistor Tr, and the above operation is performed according to the generation of the phase excitation signal G. Started.
- the current limiting circuit 3 stops the drive current when the voltage Vs of the terminal 2c due to the resistance Rs exceeds the reference voltage VREF, that is, when the output current of the power transistor Tr reaches the specified current value. Limits the output current of the power transistor Tr.
- the current limiting circuit 3 is provided to also serve as an overcurrent protection circuit.
- the reference voltage generation circuit 6a fails or the reference voltage VREF is no longer generated at the terminal 2f due to a poor connection with the terminal 2f.
- the operation described above is continuously performed with the reference voltage VREF of the reference voltage generator 6b being replaced by the reference voltage VREF of the reference voltage generator 6b.
- the stepping motor driver IC10 as a driver can continue the operation.
- FIG. 2 is a specific circuit diagram of the comparator 5, and the comparator 5 has a differential amplifier 50 including PNP transistors Ql and Q2.
- PNP transistors Q3 and Q4 connected to the base of the transistor Q1 are provided in parallel with the base of the transistor Q1.
- the emitter of the PNP transistors Q3 and Q4 is the base of the transistor Q1.
- the collector side is grounded.
- a PNP transistor Q5 connected to it is provided in parallel.
- the emitter of the transistor Q5 is connected to the base of the transistor Q2, the collector side is grounded, and the base of the transistor Q5 receives the current detection signal of the X 2 times amplification.
- a reference voltage generation circuit 6a is provided, and a reference voltage generation circuit 6b is provided between the base of the transistor Q4 and the ground GND.
- the NPN transistors Q6 and Q7 are current mirror circuits provided as active load circuits of the differential amplifier 50 downstream of the transistors Q1 and Q2, and the emitter side is grounded.
- NPN transistors Q8 and Q9 are output stage transistors, each emitter side is connected to ground GND, the collector of transistor Q8 is connected to power supply line + VDD via current source 54, and the collector of transistor Q6 From the base to receive the output.
- the collector of the transistor Q9 is connected to the power supply line + VDD via the load resistor R, receives an output from the collector of the transistor Q8 to its base, and generates a detection pulse P at its collector.
- the voltage to be generated by the first reference voltage generating circuit 6a can be easily determined if the voltage to be generated can be checked via the terminal 2f, so that the first reference voltage generating circuit 6a Can be easily replaced to return to a normal operation state.
- the voltage to be generated by the first reference voltage generation circuit 6a can be generated as the voltage of the second reference voltage generation circuit 6b or a voltage lower than this by a predetermined value. Therefore, it is preferable that the circuit configuration is such that the voltage of the second reference voltage generation circuit 6b is output to the connection terminal (terminal 2f) of the first reference voltage generation circuit 6a.
- the terminal 2f in FIG. 2 is such an example. If the voltage of the second reference voltage generation circuit 6b is higher than the reference voltage VREF of the second reference voltage generation circuit 6b by at least lVf (forward drop voltage between base and emitter), the first reference voltage generation circuit 6a Is connected to terminal 2f, transistor Q4 Is OFF.
- the reference voltage VREF is set to a slightly higher value VR than the reference voltage VREF, which hinders the operation as a dryino IC. It can be used as a driver continuously.
- the comparator 5 is configured to be provided in each of the current output circuits la, lb, lc, and Id.
- the comparator 5 is provided commonly to a plurality of power output circuits. May be.
- the detection resistor Rs of the output current value is shared by the comparator 5 of each of the current output circuits la and lb and the comparator 5b of each of the current output circuits lc and Id, and a total of 2 It can be individual.
- the power transistor Tr of the embodiment is a MOSFET transistor. Of course, this may be a bipolar transistor.
- the motor drive circuit of the stepper motor driver IC of the bipolar drive is described.
- the output circuit of the power transistor is used as the drive circuit of the push-pull operation, and the bipolar drive (positive phase)
- the present invention may be applied to a stepping motor driver IC having a phase amount opposite to that of the driving.
- the ONZOFF control of the power transistor Tr is performed via the internal delay circuit 7, the RS flip-flop (data latch circuit) 8, the AND gate 9, and the OFF timer circuit 7a.
- These circuits are not necessarily required for the present invention if the power transistor is turned off.
- the comparator 5 is one having two (+) input terminals. This is because the internal circuit of the comparator 5 is configured by two comparators in parallel. May be. This may also use a comparator with two (+) input terminals and two (1) input terminals.
- the drive circuit has a current limiting circuit or an overcurrent protection circuit that limits the drive current by turning off the power transistor at a specified current value of the force described in the stepping motor driver IC
- the present invention is applicable to any circuit.
- FIG. 1 is a block diagram centered on a single-phase drive circuit of a stepping motor driver of a bipolar drive according to an embodiment to which the current limiting circuit of the present invention is applied.
- FIG. 2 is a circuit diagram of a comparator in the current limiting circuit.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Stepping Motors (AREA)
- Electronic Switches (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005516893A JPWO2005067136A1 (ja) | 2004-01-09 | 2005-01-07 | 電流制限回路およびモータドライブ回路 |
US10/585,340 US20090190280A1 (en) | 2004-01-09 | 2005-01-07 | Current limiter circuit and motor drive circuit |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-003841 | 2004-01-09 | ||
JP2004003841 | 2004-01-09 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005067136A1 true WO2005067136A1 (ja) | 2005-07-21 |
Family
ID=34747090
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/000117 WO2005067136A1 (ja) | 2004-01-09 | 2005-01-07 | 電流制限回路およびモータドライブ回路 |
Country Status (6)
Country | Link |
---|---|
US (1) | US20090190280A1 (ja) |
JP (1) | JPWO2005067136A1 (ja) |
KR (1) | KR100830028B1 (ja) |
CN (1) | CN1910813A (ja) |
TW (1) | TW200531436A (ja) |
WO (1) | WO2005067136A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014033290A (ja) * | 2012-08-02 | 2014-02-20 | Fuji Electric Co Ltd | 半導体装置 |
Families Citing this family (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101309061B (zh) * | 2007-05-18 | 2011-08-31 | 普诚科技股份有限公司 | 马达驱动电路 |
CN106684807B (zh) * | 2010-06-01 | 2019-10-15 | 威巴斯托充电系统公司 | 公用设施接地侦测 |
TWI492534B (zh) * | 2010-09-07 | 2015-07-11 | Green Solution Tech Co Ltd | 電晶體模組及電晶體驅動模組 |
JP5492728B2 (ja) * | 2010-09-28 | 2014-05-14 | 株式会社ジャパンディスプレイ | 表示装置 |
DE102011088314A1 (de) * | 2011-12-12 | 2013-06-13 | Bayerische Motoren Werke Aktiengesellschaft | Hochfahren des Erregerstroms eines an ein Bordnetz eines Kraftfahrzeugs angeschlossenen Mehrphasenwechselstrom-Generators beim Aktivieren des Generators |
CN103607151B (zh) * | 2013-12-03 | 2016-03-30 | 嘉兴中润微电子有限公司 | 一种电机驱动芯片中的混合衰减控制电路 |
CN104242230B (zh) * | 2014-04-29 | 2017-11-24 | 西安电子科技大学 | 一种用于电力保护的直流断路器结构 |
JP2019186623A (ja) | 2018-04-03 | 2019-10-24 | ソニー株式会社 | 過電流判定回路及び発光制御装置 |
CN115864343B (zh) * | 2023-03-03 | 2023-05-23 | 珠海智融科技股份有限公司 | 一种限流电路 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06120787A (ja) * | 1992-10-09 | 1994-04-28 | Mitsubishi Electric Corp | パワーデバイスの過電流保護回路及び半導体集積回路装置 |
JPH1080186A (ja) * | 1996-09-03 | 1998-03-24 | Sanyo Electric Co Ltd | モータ駆動装置 |
JPH1080194A (ja) * | 1996-09-03 | 1998-03-24 | Shindengen Electric Mfg Co Ltd | 誘導性負荷の同期駆動方法、及びhブリッジ回路の同期制御装置 |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
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FR2685817B1 (fr) * | 1991-12-31 | 1994-03-11 | Sgs Thomson Microelectronics Sa | Protection generale d'un circuit integre contre les surcharges permanentes et decharges electrostatiques. |
US5694090A (en) * | 1996-04-18 | 1997-12-02 | Micron Technology, Inc. | Voltage and temperature compensated oscillator frequency stabilizer |
US6127882A (en) * | 1999-02-23 | 2000-10-03 | Maxim Integrated Products, Inc. | Current monitors with independently adjustable dual level current thresholds |
US7282886B1 (en) * | 2006-08-04 | 2007-10-16 | Gm Global Technology Operations, Inc. | Method and system for controlling permanent magnet motor drive systems |
-
2005
- 2005-01-07 CN CNA2005800022067A patent/CN1910813A/zh active Pending
- 2005-01-07 JP JP2005516893A patent/JPWO2005067136A1/ja active Pending
- 2005-01-07 US US10/585,340 patent/US20090190280A1/en not_active Abandoned
- 2005-01-07 KR KR1020067013333A patent/KR100830028B1/ko not_active IP Right Cessation
- 2005-01-07 WO PCT/JP2005/000117 patent/WO2005067136A1/ja active Application Filing
- 2005-01-10 TW TW094100592A patent/TW200531436A/zh unknown
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06120787A (ja) * | 1992-10-09 | 1994-04-28 | Mitsubishi Electric Corp | パワーデバイスの過電流保護回路及び半導体集積回路装置 |
JPH1080186A (ja) * | 1996-09-03 | 1998-03-24 | Sanyo Electric Co Ltd | モータ駆動装置 |
JPH1080194A (ja) * | 1996-09-03 | 1998-03-24 | Shindengen Electric Mfg Co Ltd | 誘導性負荷の同期駆動方法、及びhブリッジ回路の同期制御装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2014033290A (ja) * | 2012-08-02 | 2014-02-20 | Fuji Electric Co Ltd | 半導体装置 |
Also Published As
Publication number | Publication date |
---|---|
JPWO2005067136A1 (ja) | 2007-12-20 |
KR20060103280A (ko) | 2006-09-28 |
KR100830028B1 (ko) | 2008-05-15 |
US20090190280A1 (en) | 2009-07-30 |
CN1910813A (zh) | 2007-02-07 |
TW200531436A (en) | 2005-09-16 |
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