WO2007046363A1 - Pwm信号生成回路 - Google Patents
Pwm信号生成回路 Download PDFInfo
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- WO2007046363A1 WO2007046363A1 PCT/JP2006/320626 JP2006320626W WO2007046363A1 WO 2007046363 A1 WO2007046363 A1 WO 2007046363A1 JP 2006320626 W JP2006320626 W JP 2006320626W WO 2007046363 A1 WO2007046363 A1 WO 2007046363A1
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- WIPO (PCT)
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- level
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- signal
- oscillation
- current
- Prior art date
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- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 title claims description 22
- 230000010355 oscillation Effects 0.000 claims description 74
- 239000003990 capacitor Substances 0.000 claims description 20
- 230000007423 decrease Effects 0.000 claims description 18
- 238000001514 detection method Methods 0.000 claims description 6
- 244000145845 chattering Species 0.000 abstract description 6
- 230000001133 acceleration Effects 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 230000005764 inhibitory process Effects 0.000 abstract 1
- 230000002459 sustained effect Effects 0.000 abstract 1
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K7/00—Modulating pulses with a continuously-variable modulating signal
- H03K7/08—Duration or width modulation ; Duty cycle modulation
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/16—Modifications for eliminating interference voltages or currents
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/28—Modifications for introducing a time delay before switching
Definitions
- the present invention relates to a PWM signal generation circuit.
- the hysteresis comparator compares the two threshold voltages set to the triangular wave signal level and outputs an output signal corresponding to the level inversion of the magnitude relationship as a PWM signal.
- FIG. 3 shows a typical circuit configuration using a hysteresis comparator.
- comparator 1 has its output terminal fed back to the positive input terminal via feedback resistor 2, and its output terminal is connected to power supply line 4 (+ B) via resistor 3. Yes.
- the comparator 1 is provided with a triangular wave signal at its negative input terminal, and a divided voltage obtained by dividing the power supply voltage by resistors 5 and 6 is provided as a threshold voltage at the positive input terminal.
- the resistance value of each resistance component (resistors 2 and 3) provided in this hysteresis comparator is used in the manufacturing process. It fluctuates. For this reason, even if the resistors 5 and 6 are externally attached and manufacturing variations of the resistors 5 and 6 are suppressed, the respective threshold values affected by the variations of the resistors 2 and 3 in the hysteresis comparator are changed. As a result, the duty ratio of the output signal (PWM signal) from the hysteresis comparator varies from product to product, and the headlights have a stable brightness as expected in advance. There was a risk that it could not light up.
- the present invention has been completed based on the above-described circumstances, and has a PWM with a stable duty ratio without being affected by power supply noise of a vehicle or variations due to manufacturing factors of circuit constants.
- An object of the present invention is to provide a PWM signal generation circuit capable of generating a signal.
- a PWM signal generation circuit includes an oscillation circuit that outputs an oscillation signal, the oscillation signal from the oscillation circuit and a reference signal, and an oscillation signal level and a reference signal level.
- a comparison circuit that outputs a pulse train output signal whose level is inverted according to the magnitude relationship as a PWM signal for pulse width modulation control, and a desired duty ratio of the PWM signal from the point when the output signal is level inverted. Regardless of the signal level of either one of the oscillation signal and the reference signal, the time before the next level inversion at the regular timing corresponding to A level inversion prohibiting circuit that prohibits level inversion of the output signal by changing a level to be compared to a level at which the output signal cannot be level inverted. It is a configuration that.
- the level inversion prohibiting circuit forcibly maintains the inverted state from the time when the level of the output signal is inverted, and the level inversion is prohibited. Specifically, for example, when the oscillation signal level exceeds the reference signal level, the level that should be compared with the reference signal level in the comparison circuit is surely higher than the reference signal level regardless of the oscillation signal level. Force change to Also, for example, when the oscillation signal level falls below the reference signal level, the ratio is set regardless of the reference signal level. The comparison circuit forcibly changes the level that should be compared with the oscillation signal level to a level that is definitely higher than the oscillation signal level.
- the above level inversion is performed before the next level inversion at the normal timing corresponding to the desired duty ratio of the PWM signal (the level in which noise is not generated, the normal level inversion timing).
- the prohibited state is released and level inversion is allowed.
- the inverted state is forcibly maintained again, and then the prohibition state of the level no-reversal is canceled before the next level inversion.
- chattering can be prevented even when the reference signal level or the oscillation signal level fluctuates due to, for example, power supply noise of the vehicle.
- a PWM signal with a stable duty ratio can be generated even when there are variations in circuit constants due to manufacturing factors.
- the comparison circuit has a first current control element that flows a current according to the oscillation signal level and a second current control element that flows a current according to the reference signal level, and a current flowing through the first current control element
- the level of the output signal is inverted according to the magnitude relationship between the current flowing in the second current control element and the level of the output signal.
- the oscillation circuit further includes a capacitor as a frequency determining element that determines the oscillation frequency, a resistance element connected to the power supply, and a current mirror circuit that receives a current from the power supply via the resistance element. It is desirable to have a configuration in which charging and discharging is performed by a mirror current generated by a circuit. According to this configuration, a PWM signal having a constant duty ratio can be generated regardless of fluctuations in the power supply voltage.
- FIG. 1 is a configuration diagram of a PWM signal generation circuit according to an embodiment of the present invention.
- a PWM signal generation circuit 10 generates a PWM signal S1 having a desired duty ratio and connects it to a switch element (for example, a power MOSFET, Power supply to the load is controlled by P WM (Pulse Width Modulation Pulse Width Modulation) by applying it to a semiconductor switch element (eg IPD: Intelligence Power Device) with built-in protection function and turning it on / off.
- P WM Pulse Width Modulation Pulse Width Modulation
- the PWM signal generation circuit 10 is mounted on a vehicle (not shown), and is used as a load to control driving of, for example, a vehicle lamp, a cooling fan motor, and a wiper driving motor.
- FIG. 1 is a configuration diagram of a PWM signal generation circuit 10 according to the present embodiment. Shown in the same figure As described above, the PWM signal generation circuit 10 mainly includes a frequency control circuit 11 that outputs an oscillation signal S2, a switching circuit 12 for switching between daytime lighting and nighttime lighting, which will be described later, and a leakage current cut circuit 13; , And a duty ratio control circuit 14.
- the frequency control circuit 11 (an example of the “oscillation circuit” of the present invention) includes a comparator 20 (which may be an operational amplifier).
- the negative input terminal force of the comparator 20 is a capacitor 21 and a resistor as a frequency determining element. It is connected to the high potential (Vcc) terminal of the power supply (for example, battery) through the parallel circuit 27 of R1. That is, a voltage signal having a level corresponding to the voltage across the capacitor 21 is given to the negative input terminal of the comparator 20.
- Vcc high potential
- the power supply for example, battery
- the voltage level at point A connected to the negative input terminal of comparator 20 is Va.
- a signal corresponding to the voltage Va level at this point A is given to the duty ratio control circuit 14 as the oscillation signal S2.
- the positive input terminal of the comparator 20 is supplied with the divided potential of the voltage dividing circuit composed of the voltage dividing resistors R2 and R3 connected in series between the high potential terminal and the low potential (GND) terminal of the power supply.
- the output B of the comparator 20 is positively fed back via the feedback resistor R4.
- a voltage signal of a level corresponding to each resistance value of the voltage dividing resistors R2 and R3 and the feedback resistor R4 is given to the positive input terminal of the comparator 20.
- the voltage level at point C connected to the positive input terminal of comparator 20 is Vc.
- the output of the comparator 20 is supplied to the NOT circuit 22.
- the low potential side of the parallel circuit 27 is connected to the low potential terminal side of the power supply through three n-channel FETs 23, 24, 25 and a resistor R5 connected in series. Among these, the voltage signal of output D of NOT circuit 22 is given to the gate of FET23 on the high potential side.
- the FET 24 forms a current mirror circuit 28 together with an n-channel FET 26 whose gate and drain are short-circuited, and the drain of the FET 26 is a resistor R6 (the “resistance element” of the present invention). To the high potential terminal of the power source.
- the switching circuit 12 has a pair of pnp-type transistors 30 and 31, of which the transistor 30 has an emitter connected to the high potential terminal side of the power supply and a collector connected to a pair of voltage dividing resistors R7 and R8. To the low potential terminal side of the power supply. In the transistor 31, the emitter is connected to the high potential terminal side of the power supply, and the collector is connected to the connection point E of the voltage dividing resistors R7 and R8. Then, a signal corresponding to the voltage Ve level at the connection point E is supplied to the duty ratio control circuit 14 as a reference signal S3. A signal corresponding to the voltage Ve level at the connection point E is also applied to the gate of the FET 25.
- the transistor 31 is turned on in response to a signal instructing “lighting at night” to turn on the headlight with a duty ratio of 100%, for example, from an operation unit (not shown) in the vehicle.
- the transistor 30 is turned on in response to a signal instructing “daylighting (delighting)” to turn on the headlight at a duty ratio of 25% (an example of the “desired deedy ratio” of the present invention), for example.
- the FET 25 is turned on when either one of the transistors 30 and 31 is in the on state, and is turned off when both the transistors 30 and 31 are in the off state. In short, the FET 25 is in the off state when the headlight is not lit except for lighting at night and during daylighting, and serves to suppress leakage current.
- the duty ratio control circuit 14 includes a comparator 50 (an example of the “comparison circuit” of the present invention). Comparator 50 is connected to its positive input terminal and receives an oscillation signal S2, and is turned on / off.
- the p-channel first FET 51 an example of the “first current control element” of the present invention
- a p-channel type second FET 52 an example of the “second current control element” of the present invention that is turned on and off in response to S3.
- the first FET 51 has a source connected to the constant current source 60 and is connected to a connection point between the FET 24 and the FET 25 via a drain force channel type FET 53.
- the second F ET 52 has a source connected to the constant current source 60 and is connected to a connection point between the FET 24 and the FET 25 via a drain power channel FET 54.
- the FET 53 has its gate and drain connected in a short circuit, and constitutes a current mirror circuit together with the FET 54.
- a p-channel first short-circuit FET 55 (an example of the “first short-circuit switch element” of the present invention) is connected in parallel to the first FET 51.
- the FE T55 is turned on by receiving a low-level control signal S5 at its gate and serves to short-circuit between the source and drain of the first FET 51.
- a p-channel type second short-circuit FET 56 (an example of the “second short-circuit switch element” of the present invention) is connected in parallel to the second FET 52, and the second short-circuit FET 56 is also connected to the gate.
- the PWM signal generation circuit 10 includes a pair of NAND circuits 58 and 59.
- the NAND circuit 58 is supplied with the voltage level Vd of the output D of the NOT circuit 22 and the voltage level Vh of the output point H of the NOT circuit 57 at its input, and the output is the gate of the first short-circuit FET 55.
- the NAND circuit 59 is given the voltage level Vb at the output point B of the comparator 20 and the voltage level Vf at the input point F of the NOT circuit 57 at its input, and its output is fed to the gate of the second short-circuit FET 56. It has come to be given.
- the circuit configuration of the PWM signal generation circuit 10 is as described above, in the present embodiment, the part other than the capacitor 21, the resistor R1, and the switching circuit 12 that determines the oscillation frequency of the frequency control circuit 11 is one.
- the structure is housed in the chip 70. Therefore, it is possible to adjust the frequency of the oscillation signal S2 by changing the capacitor 21 and the resistor R1 arranged outside the chip 70. In addition, it is possible to adjust the duty ⁇ ⁇ ⁇ of the PWM signal S1 by changing the voltage dividing resistors R7 and R8.
- the FET 25 is turned on. Initially, the point A connected to the negative input terminal of the comparator 20 is on the voltage Vcc side of the high potential terminal of the power supply, and the comparator 20 is in the off state, that is, the voltage at the output point B of the comparator 20 Vb is low. Therefore, FET23 is turned on by the high level voltage signal Vd from NOT circuit 22, current flows from the power supply through parallel circuit 27, FET23, 24, 25 and resistor R5, and capacitor 21 is charged. Be started.
- the current il flowing through the FETs 23 and 24 is equal to the current R2 and the current i2 flowing through the FET 26. That is, it depends on the high potential Vcc of the power supply. Therefore, when the high potential Vcc of the power supply becomes low due to, for example, fluctuations in the power supply voltage, the amount of charging current il to the capacitor 21 decreases so as to follow this. On the contrary, when the high potential Vcc of the power supply becomes high, the amount of current il charged to the capacitor 21 increases so as to follow this. For this reason, as a result, the charging time of the capacitor 21 that is not affected by the fluctuation of the high potential Vcc of the power supply, that is, the frequency of the oscillation signal S2 at the point A can be stabilized.
- the voltage level Vb at the output point B of the comparator 20 is substantially equal to the low potential GND of the power supply.
- the voltage dividing resistors R2 and R3 have the same resistance value, and the feedback resistor R4 is set to a resistance value half that of each voltage dividing resistor R2 (R3). Therefore, as shown in FIG. 2 (the uppermost time chart), the voltage level Vc at the point C is 1/4 Vcc, which is given to the positive input terminal of the comparator 20.
- the oscillation signal S2 from the frequency control circuit 11 is input to the positive input terminal, and the voltage level Ve at the connection point E from the switching circuit 12 is applied to the negative input terminal. It is done.
- the voltage level Ve at the connection point E is a level (l / 4Vcc) as shown in FIG. 2 (the uppermost time chart).
- the resistance values of resistors R7 and R8 are set so that the level is close to 1Z4V cc. More specifically, the duty ratio of the PWM signal S1 is adjusted to be 25%, for example. As shown in Fig.
- 1S is a “regular timing corresponding to a desired duty ratio” as used in the present invention, and corresponds to a “time when the next level is inverted”.
- the comparator 50 when the oscillation signal S2 level exceeds the voltage level Ve at the connection point E, the first FET 51 is in the OFF state, and the voltage level Vre of the output point F of the comparator 50 is high. Become a level.
- the first FET 51 when the oscillation signal S2 level falls below the voltage level Ve at the connection point E, the first FET 51 is turned on, and the voltage level Vf at the output point F of the comparator 50 is inverted to a low level. As a result, the voltage level Vf at the output point F of the comparator 50 becomes a rectangular pulse waveform as shown in FIG. 2 (the time chart at the fourth stage from the top).
- the reference signal S3 level (voltage level Ve of connection E) given from the switching circuit 12 may fluctuate due to, for example, noise during acceleration / deceleration of the vehicle. Then, chattering occurs when the level of the oscillation signal S2 level and the reference signal S3 level is inverted (see Fig. 2 (fourth and fifth stage time charts from the top)), and the duty ratio of the PWM signal S1 fluctuates. There is a possibility that stable PWM control cannot be performed for medium lighting.
- the comparator 50 is provided with the first and second short-circuit FETs 55 and 56.
- the first short-circuit FET 55 is from the NAND circuit 58.
- the voltage level Vd of the output D of the NOT circuit 22 and the voltage level Vh of the output point H of the NOT circuit 57 are both high, the low level signal is received to turn on, otherwise the high level signal Is turned off.
- the first short-circuit FET 55 has an increasing / decreasing tendency of the oscillation signal S2 after the oscillation signal S2 level falls below the reference signal S3 level, as shown in Fig. 2 (time chart at the 6th stage from the top). Is turned on (short-circuit operation) for the period up to the point when the signal is reversed (reverse tendency to increase tendency), and is off (non-short-circuited) for the rest of the period.
- the first short-circuiting FET 55 short-circuits the drain and source of the first FET 51 on the positive input terminal side.
- a larger current flows through the FET 53 connected to the first FET 51 and the FET 54 constituting the current mirror circuit. Therefore, even if the reference signal S3 level fluctuates at this time, the voltage level Vf at the output point F of the comparator 50 can be forcibly maintained at the low level and the level inversion can be prohibited.
- the voltage level Va at the point A decreases, and the current flowing through the first FET 51 tends to increase.
- the current flowing through the first FET 51 (current according to the level of the oscillation signal S2) is the FET 53, 54.
- the second short-circuit FET 56 starts from the NAND circuit 59 when the voltage level Vb at the output point B of the comparator 20 and the voltage level Vf at the input point F of the NOT circuit 57 are both high. In response to the signal, it is turned on. At other times, it receives the high level signal and turns off. In other words, as shown in Fig. 2 (the 7th time chart from the top), the second short-circuiting FE T56 increases or decreases the oscillation signal S2 after the oscillation signal S2 level exceeds the reference signal S3 level. The period up to the point when the trend is reversed During this period, it is turned on (short circuit operation), and during other periods it is turned off (non-short circuit state).
- the oscillation signal S2 level exceeds the reference signal S3 level
- the drain-source of the second FET 52 on the negative input terminal side is short-circuited by the second short-circuiting FET 56. Therefore, even if the reference signal S3 level fluctuates at this time, the voltage level Vf at the output point F of the comparator 50 can be forcibly maintained at the high level and the level inversion can be prohibited.
- the capacitor 21 is discharged, the voltage level Va at the point A rises and the current flowing through the first FET 51 tends to decrease, while the current according to the reference signal S3 level flows through the second FET 52.
- the NAND circuits 58 and 59 function as the “increase / decrease inversion detection circuit” and “short-circuit control circuit” of the present invention, and together with the first and second short-circuit FETs 55 and 56, the “level inversion of the present invention”. It constitutes a “forbidden circuit”.
- the operation during daytime lighting has been described.
- the transistor 30 is turned off and the transistor 31 is turned on.
- the reference signal S3 level (voltage level Ve of connection E) becomes almost the same level as the high potential Vcc of the power supply, as shown on the right side of FIG. 2 (the uppermost time chart). Therefore, the reference signal S3 level always exceeds the oscillation signal S2 level, and thus the night lighting with a duty ratio of 100% is executed.
- the night of the head ride is controlled by the switch control of the switching circuit 12. It is possible to switch between on-time lighting and daytime lighting, and to cut the leakage current when the headlight is not lit.
- the inversion state of the output signal S4 (output signal S4 ′) from the time when the level is inverted by the first and second short circuit FETs 55 and 56 as the level inversion prohibiting circuit is changed.
- the level inversion prohibition is automatically canceled when the increase / decrease tendency of the oscillation signal S2 is reversed after that.
- chattering can be prevented even when the reference signal S3 level fluctuates due to, for example, noise during vehicle acceleration.
- the reference signal S3 level is mainly determined by voltage dividing resistors R7 and R8 provided in the switching circuit 12, and the resistance component in the comparator 50 is The configuration is substantially unaffected.
- the voltage dividing resistors R7 and R8 are externally attached, and can be made to have appropriate resistance values even after the PWM signal generation circuit 10 is manufactured. Therefore, the PWM signal S1 with a stable duty ratio can be generated even when there are variations due to manufacturing factors of circuit constants (see Figure 2 (bottom time chart)).
- the NAND circuit 58 detects the time when the increase / decrease tendency of the oscillation signal S2 is reversed after the oscillation signal S2 level falls below the reference signal S3 level, and the first short circuit is detected at this detection timing. Release the short circuit operation of FET55, that is, release the level inversion prohibition.
- the NAND circuit 59 detects when the increase / decrease tendency of the oscillation signal S2 is reversed, and at this detection timing, the second short-circuit FE T56 is short-circuited. Is released, that is, the level inversion prohibition is released. Therefore, the level inversion prohibition can be canceled without using a timer or the like.
- the FETs 23 to 25 and 51 to 56 may be bipolar transistors.
- the transistors 30 and 31 may be unipolar transistors such as FETs.
- the comparator 50 is used as the comparison circuit.
- the present invention is not limited to this, and a configuration using an operational amplifier may be used.
- the short-circuit switch elements of the present invention are connected in parallel to the pair of switch elements constituting the push-pnore circuit in the operational amplifier.
- a plenore down (outputs an oscillation signal based on the potential at the low potential end of the capacitor 21) type oscillation circuit is employed.
- An oscillation signal output type may be employed.
- the reference signal is set to the low potential side of the oscillation level as in the above embodiment, the oscillation signal waveform is steep in this portion, and thus chattering may occur. There is an advantage that the time can be shortened.
- the level to be compared with the oscillation signal level is compared with the oscillation signal level in the comparison circuit regardless of the reference signal level.
- a configuration that forcibly changes to a level lower than the oscillation signal level or a level that should be compared with the reference signal level in the comparator circuit regardless of the oscillation signal level when the oscillation signal level falls below the reference signal level May be forcibly changed to a level surely lower than the reference signal level.
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- Dc-Dc Converters (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007513548A JP4404270B2 (ja) | 2005-10-17 | 2006-10-17 | Pwm信号生成回路 |
DE112006002710.7T DE112006002710B4 (de) | 2005-10-17 | 2006-10-17 | PWM-Signalgenerator |
US12/083,621 US7639055B2 (en) | 2005-10-17 | 2006-10-17 | PWM signal generator |
Applications Claiming Priority (2)
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JP2005-301694 | 2005-10-17 | ||
JP2005301694 | 2005-10-17 |
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WO2007046363A1 true WO2007046363A1 (ja) | 2007-04-26 |
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PCT/JP2006/320626 WO2007046363A1 (ja) | 2005-10-17 | 2006-10-17 | Pwm信号生成回路 |
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US (1) | US7639055B2 (ja) |
JP (1) | JP4404270B2 (ja) |
DE (1) | DE112006002710B4 (ja) |
WO (1) | WO2007046363A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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CN102490690A (zh) * | 2011-12-16 | 2012-06-13 | 湖南工业大学 | 脉宽调制的机车刮雨器控制系统 |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
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US7902692B2 (en) * | 2007-02-22 | 2011-03-08 | Lear Corporation | Inverter system |
JP5488074B2 (ja) * | 2010-03-15 | 2014-05-14 | 株式会社リコー | パルス幅変調信号生成回路 |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05168164A (ja) * | 1991-12-17 | 1993-07-02 | Honda Motor Co Ltd | 高電圧バッテリを用いた車輌用負荷の駆動回路 |
JPH1141077A (ja) * | 1997-07-24 | 1999-02-12 | Toyota Autom Loom Works Ltd | 誤動作防止機能を備えた制御回路 |
JPH1197989A (ja) * | 1997-09-18 | 1999-04-09 | Toyota Autom Loom Works Ltd | 誤動作防止機能を有するパルス信号生成装置 |
Family Cites Families (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5173847A (en) * | 1988-09-30 | 1992-12-22 | Canon Kabushiki Kaisha | PWM power supply with synchronous rectifier and synchronizing oscillator |
US5113158A (en) * | 1990-07-02 | 1992-05-12 | Toyota Jidosha Kabushiki Kaisha | Pulse width modulation circuit |
US5436820A (en) * | 1993-06-09 | 1995-07-25 | Eldec Corporation | Power converter with dual PWM control |
JP3408006B2 (ja) * | 1995-01-31 | 2003-05-19 | 三洋電機株式会社 | 発振回路 |
JP3050203B2 (ja) * | 1998-04-27 | 2000-06-12 | 株式会社村田製作所 | 圧電トランスインバータ |
KR100576692B1 (ko) * | 2000-07-06 | 2006-05-03 | 엘지전자 주식회사 | 액정표시장치의 백 라이트 램프 구동회로 |
US6342822B1 (en) * | 2000-11-28 | 2002-01-29 | Fairchild Semiconductor Corporation | Method and apparatus for implementing improved pulse width modulation |
JP3914047B2 (ja) | 2001-12-20 | 2007-05-16 | Necエレクトロニクス株式会社 | 発振回路 |
KR100451928B1 (ko) * | 2002-03-08 | 2004-10-08 | 삼성전기주식회사 | 엘시디 백라이트용 인버터의 싱글 스테이지 컨버터 |
US6969183B2 (en) * | 2002-12-27 | 2005-11-29 | Ichikoh Industries, Ltd. | Digital lighting apparatus for vehicle, controller for digital lighting apparatus, and control program for digital lighting apparatus |
DE10301501B4 (de) * | 2003-01-16 | 2007-05-03 | Siemens Ag | Schaltungsanordnung und Verfahren zur Erzeugung eines Pulsweiten-modulierten Signals |
DE112006002885B8 (de) * | 2005-10-31 | 2016-01-14 | Autonetworks Technologies, Ltd. | Energieversorgungssteuerung |
JP4602231B2 (ja) * | 2005-11-08 | 2010-12-22 | 株式会社オートネットワーク技術研究所 | 発音制御装置 |
-
2006
- 2006-10-17 WO PCT/JP2006/320626 patent/WO2007046363A1/ja active Application Filing
- 2006-10-17 US US12/083,621 patent/US7639055B2/en active Active
- 2006-10-17 JP JP2007513548A patent/JP4404270B2/ja active Active
- 2006-10-17 DE DE112006002710.7T patent/DE112006002710B4/de active Active
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH05168164A (ja) * | 1991-12-17 | 1993-07-02 | Honda Motor Co Ltd | 高電圧バッテリを用いた車輌用負荷の駆動回路 |
JPH1141077A (ja) * | 1997-07-24 | 1999-02-12 | Toyota Autom Loom Works Ltd | 誤動作防止機能を備えた制御回路 |
JPH1197989A (ja) * | 1997-09-18 | 1999-04-09 | Toyota Autom Loom Works Ltd | 誤動作防止機能を有するパルス信号生成装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN102490690A (zh) * | 2011-12-16 | 2012-06-13 | 湖南工业大学 | 脉宽调制的机车刮雨器控制系统 |
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DE112006002710T5 (de) | 2008-09-11 |
JP4404270B2 (ja) | 2010-01-27 |
US20090108894A1 (en) | 2009-04-30 |
US7639055B2 (en) | 2009-12-29 |
DE112006002710B4 (de) | 2016-02-11 |
JPWO2007046363A1 (ja) | 2009-04-23 |
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