CN100541960C - Pulse modulation locking power-off protection circuit - Google Patents
Pulse modulation locking power-off protection circuit Download PDFInfo
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- CN100541960C CN100541960C CNB2005100709409A CN200510070940A CN100541960C CN 100541960 C CN100541960 C CN 100541960C CN B2005100709409 A CNB2005100709409 A CN B2005100709409A CN 200510070940 A CN200510070940 A CN 200510070940A CN 100541960 C CN100541960 C CN 100541960C
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Abstract
一种脉冲调制锁住断电保护电路，其包含一马达驱动电路、一运转侦测电路及一脉冲触发电路，当该马达驱动电路无法正常工作时，该运转侦测电路会输出信号，使得该脉冲触发电路输出脉冲信号以测试马达是否可被驱动，其中这些脉冲信号的周期可调整，以控制测试马达驱动期间的工作电流，该测试马达驱动期间的工作电流小于该马达驱动电路的正常运转电流。
A pulse modulation locking power-off protection circuit includes a motor drive circuit, an operation detection circuit and a pulse trigger circuit. When the motor drive circuit cannot work normally, the operation detection circuit will output a signal, so that the pulse trigger circuit outputs a pulse signal to test whether the motor can be driven, wherein the period of these pulse signals can be adjusted to control the working current during the test motor drive period, and the working current during the test motor drive period is less than the normal operating current of the motor drive circuit.
Description
Technical field
The present invention is relevant for a kind of locking power-off protection circuit employing, particularly relevant for a kind of locking power-off protection circuit employing pulse modulation that utilizes.
Background technology
Fan is in operation process; if can't turn round because of external force causes fan motor; it pins electric current must be greater than normal operating current; as shown in Figure 1; a kind of existing electric current limiting protecting circuit; it comprises a motor drive circuit 110 and a current limit circuit 120; when motor failure makes that flabellum can't turn round, pin electric current and can make the transistorized collector electrode of current limit circuit 120 become electronegative potential, this electronegative potential makes the not conducting of transistor of motor drive circuit 110; to reach the purpose that reduces electric current; yet when metering function took place, the pressure drop major part occurred in transistorized two ends; must bear great power, its fail safe causes anxiety.
See also Fig. 2; a kind of existing fan locking power-off protection circuit employing; it comprises a motor drive circuit 210 and the circuit 220 of base generation for the moment; when fan motor can't turn round; this time base produces circuit 220 during the output high potential signal; motor drive circuit 210 does not have electric current to be passed through; and should time base produce circuit 220 during the output low-potential signal; if pinning the reason of (can't turn round), motor do not disappear as yet; electric current constantly impacts driving transistors during this low-potential signal; and this electric current has a strong impact on transistorized reliability much larger than the motor normal operating current.
In addition, the TaiWan, China patent application case circuit that number No. 092122150 " Brushless DC motor " disclosed, it pins electric current also must be greater than normal operating current.
Summary of the invention
Main purpose of the present invention is to provide a kind of locking power-off protection circuit employing pulse modulation; utilize a pulsed triggering circuit output pulse signal with the test motor driven; wherein the cycle of these pulse signals can be adjusted, so that the operating current during the test motor driven is less than the normal operating current of motor.
Of the present invention time a purpose is to provide a kind of locking power-off protection circuit employing pulse modulation; utilize a pulsed triggering circuit output pulse signal with the test motor driven; wherein the cycle of pulse signal can be adjusted; so that the operating current during the test motor driven is less than the normal operating current of motor; therefore; in the time of can avoiding motor to pin; burst current impacts transistor or other circuit unit; improve reliability; reduce fraction defective, in addition, the operating current during the test motor driven is less than the normal operating current of motor; so can be directly with normal operating current as design, improve the utilance of circuit unit.
According to locking power-off protection circuit employing pulse modulation of the present invention; it comprises a motor drive circuit; an one running circuit for detecting and a pulsed triggering circuit; this motor drive circuit is in order to the motor that turns round; when this motor drive circuit can't operate as normal; this running circuit for detecting meeting output signal; make whether this pulsed triggering circuit output pulse signal can be driven with the test motor; wherein the cycle of pulse signal can be adjusted; with the operating current during the control test motor driven, make operating current during this test motor driven less than the normal operating current of this motor drive circuit.
Description of drawings
Fig. 1 is existing electric current limiting protecting circuit.
Fig. 2 is existing fan locking power-off protection circuit employing.
Fig. 3 is according to the present invention, a kind of locking power-off protection circuit employing pulse modulation.
Symbol description:
110 motor drive circuits, 120 current limit circuits
Base produces circuit during 210 motor drive circuits 220
10 locking power-off protection circuit employing pulse modulations
11 motor drive circuits, 12 running circuit for detecting, 13 pulsed triggering circuits
14 Hall voltage amplifying circuits, 15 phasing back circuit
16 coil winding drive circuits, 17 ON/OFF timing circuits, 18 pulse waves produce circuit
C1 first capacitor C 2 second capacitor C 3 the 3rd electric capacity
The D1 first diode D2 second diode D3 the 3rd diode
D4 the 4th diode
The IC1 first reverser IC2 second reverser IC3 the 3rd reverser
IC4 the 4th reverser OSC oscillator
R1 first resistance R 2 second resistance R 3 the 3rd resistance
Embodiment
See also appended graphicly, the present invention will enumerate following embodiment explanation:
According to a specific embodiment of the present invention; see also Fig. 3; a kind of locking power-off protection circuit employing pulse modulation 10; it comprises a motor drive circuit 11; an one running circuit for detecting 12 and a pulsed triggering circuit 13; this motor drive circuit 11 is in order to the motor of running just like fan; this motor drive circuit 11 comprises a Hall voltage amplifying circuit 14; an one phasing back circuit 15 and a coil winding drive circuit 16; in the present embodiment; this running circuit for detecting 12 comprises one first capacitor C 1; one second capacitor C 2; one first reverser IC1; one second reverser IC2; one first diode D1; and this pulsed triggering circuit 13 comprises an ON/OFF timing circuit 17 and a pulse wave produces circuit 18; this ON/OFF timing circuit 17 can be for the moment that base produces circuit or another pulse wave produces circuit, present embodiment with the time base produce circuit and exemplify.When these motor drive circuit 11 operate as normal, first capacitor C, the 1 commissure CRANK PULSES of this running circuit for detecting 12 is to this first reverser IC1, this first reverser IC1 output may be low-potential signal or high potential signal, IC1 is output as low-potential signal when this first reverser, the electric charge of this second capacitor C 2 flows into this first reverser IC1 discharge through this first diode D1, so this second capacitor C 2 can't be charged to high potential, be output as high potential signal and work as this first reverser IC1, voltage charges to this second capacitor C 2 through one first resistance R 1, because the charging interval of R1xC2 is much larger than operating frequency, this second capacitor C 2 also can't be charged to high potential, promptly when this motor drive circuit operate as normal, this running circuit for detecting 12 continues the output high potential signal, this high potential signal becomes low-potential signal through one the 3rd reverser IC3, make these pulsed triggering circuit 13 outputs also be low-potential signal, become high potential signal through one the 4th reverser IC4 again, so the coil winding drive circuit 16 of this motor drive circuit is not subjected to this pulsed triggering circuit 13 controls.
When this motor drive circuit 11 can't be worked, the first capacitor I C1 of this running circuit for detecting 12 does not have input signal, this first reverser IC1 is output as high potential signal, this high potential charges to this second capacitor C 2 through this first resistance R 1, when this second capacitor C 2 reaches high potential, this second reverser IC2 exports electronegative potential, promptly should export low-potential signals by running circuit for detecting 12, to activate this ON/OFF timing circuit 17, when this ON/OFF timing circuit 17 is output as high potential signal, become low-potential signal, the coil winding drive circuit 16 not conductings of this motor drive circuit 11 through the 4th reverser IC4; When this ON/OFF timing circuit 17 was output as low-potential signal, this low-potential signal can be isolated by one second diode D2.In addition, when these running circuit for detecting 12 output low-potential signals, also can export high potential signal through the 3rd reverser IC3, when high potential signal be transferred to one with the door G1, should be connected this pulse wave with the input of door G1 and produce circuit 18, this pulse wave produces circuit 18 and comprises an oscillator OSC, one the 3rd capacitor C 3, one the 3rd diode D3 and one the 4th diode D4, should be output decision with the output of door G1 by this oscillator OSC, this oscillator OSC utilizes the 3rd diode D3 and the 4th diode D4 to connect one second resistance R 2 and one the 3rd resistance R 3 respectively, make the filling of the 3rd capacitor C 3, the time cycle difference of discharge, the modulation pulse wave of different ON/OFF time ratios so can vibrate, to export a plurality of pulse signals, when this pulse wave generation circuit 18 is output as low-potential signal, should also be low-potential signal with the output of door G1, the 4th reverser IC4 is input as a plurality of pulse signals, so when this ON/OFF timing circuit 17 is output as low-potential signal, and when this pulse wave generation circuit 18 is output as low-potential signal, this pulsed triggering circuit 13 can be exported a plurality of pulse signals to attempt CD-ROM drive motor, because this pulse wave produces the ON/OFF time ratio of the pulse signal of circuit 18 outputs and can specify, adjust, so can control the operating current of testing during the motor driven.
The present invention utilizes when this motor drive circuit 11 can't be worked, these running circuit for detecting 12 output low-potential signals, to activate this ON/OFF timing circuit 17, and export high potential signal through the 3rd reverser IC3, and make this pulse wave produce circuit 18 output low-potential signals, when this ON/OFF timing circuit 17 is output as low-potential signal, this pulsed triggering circuit 13 can be exported these pulse signals to attempt CD-ROM drive motor, because the cycle of these pulse signals can be adjusted, so that the operating current during the test motor driven is less than the normal operating current of motor, therefore, in the time of can avoiding motor to pin, burst current impacts transistor or other circuit unit, improves reliability, reduces fraction defective, in addition, the operating current of test during the motor driven be less than the normal operating current of motor, thus can be directly with normal operating current as design, the utilance of raising circuit unit.
Though the present invention discloses as above with preferred embodiment; right its is not in order to restriction the present invention, anyly has the knack of this skill person, without departing from the spirit and scope of the present invention; change and retouching when doing, thus protection scope of the present invention when with the accompanying Claim scope the person of being defined be as the criterion.
Claims (4)
1; a kind of locking power-off protection circuit employing pulse modulation; it comprises a motor drive circuit; an one running circuit for detecting and a pulsed triggering circuit; this motor drive circuit comprises a Hall voltage amplifying circuit; one coil winding drive circuit and one electrically connects the phasing back circuit of this Hall voltage amplifying circuit and this coil winding drive circuit; this running circuit for detecting electrically connects this phasing back circuit of this motor drive circuit; this pulsed triggering circuit comprises the pulse wave generation circuit that an ON/OFF timing circuit and that electrically connects this phasing back circuit electrically connects this running circuit for detecting; this motor drive circuit is in order to the running motor; when motor pins; this Hall voltage amplifying circuit of this motor drive circuit makes this running circuit for detecting export a low voltage signal; make this pulsed triggering circuit output pulse signal to attempt CD-ROM drive motor to confirm this motor drive circuit to work; wherein this ON/OFF timing circuit is adjusted the cycle of described pulse signal, with the operating current during the control trial CD-ROM drive motor.
2, locking power-off protection circuit employing pulse modulation according to claim 1, wherein the operating current during this trial motor driven is less than the normal operating current of this motor drive circuit.
3, locking power-off protection circuit employing pulse modulation according to claim 1, wherein this ON/OFF timing circuit is that base produces circuit for the moment.
4, locking power-off protection circuit employing pulse modulation according to claim 1, wherein this ON/OFF timing circuit produces circuit for another pulse wave.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100709409A CN100541960C (en) | 2005-05-18 | 2005-05-18 | Pulse modulation locking power-off protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100709409A CN100541960C (en) | 2005-05-18 | 2005-05-18 | Pulse modulation locking power-off protection circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1866658A CN1866658A (en) | 2006-11-22 |
| CN100541960C true CN100541960C (en) | 2009-09-16 |
Family
ID=37425579
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100709409A Expired - Fee Related CN100541960C (en) | 2005-05-18 | 2005-05-18 | Pulse modulation locking power-off protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100541960C (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2403177Y (en) * | 1999-10-12 | 2000-10-25 | 建准电机工业股份有限公司 | fan motor |
| CN1073757C (en) * | 1998-05-14 | 2001-10-24 | 谢新茂 | DC brushless fan detection circuit |
| CN1372375A (en) * | 2001-02-28 | 2002-10-02 | 协禧电机股份有限公司 | Fixed speed control circuit of small fan |
| CN2572688Y (en) * | 2002-09-15 | 2003-09-10 | 张清卫 | Background lamp automatical controller for mobile telephone set |
-
2005
- 2005-05-18 CN CNB2005100709409A patent/CN100541960C/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073757C (en) * | 1998-05-14 | 2001-10-24 | 谢新茂 | DC brushless fan detection circuit |
| CN2403177Y (en) * | 1999-10-12 | 2000-10-25 | 建准电机工业股份有限公司 | fan motor |
| CN1372375A (en) * | 2001-02-28 | 2002-10-02 | 协禧电机股份有限公司 | Fixed speed control circuit of small fan |
| CN2572688Y (en) * | 2002-09-15 | 2003-09-10 | 张清卫 | Background lamp automatical controller for mobile telephone set |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1866658A (en) | 2006-11-22 |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Xiexi Micro-Electromechanical Technology (Kunshan) Co., Ltd. Assignor: Xiexi Motor Co., Ltd. Contract record no.: 2010990000273 Denomination of invention: Locking power-off protection circuit employing pulse modulation Granted publication date: 20090916 License type: Exclusive License Open date: 20061122 Record date: 20100512 |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090916 Termination date: 20150518 |
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| EXPY | Termination of patent right or utility model |