CN111313392B - Automatic current-limiting protection system and method for crystal oscillator - Google Patents
Automatic current-limiting protection system and method for crystal oscillator Download PDFInfo
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- CN111313392B CN111313392B CN202010237561.9A CN202010237561A CN111313392B CN 111313392 B CN111313392 B CN 111313392B CN 202010237561 A CN202010237561 A CN 202010237561A CN 111313392 B CN111313392 B CN 111313392B
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- oscillator
- current
- crystal oscillator
- ink
- jet printer
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
Abstract
The invention relates to an automatic current-limiting protection system and method of a crystal oscillator, wherein the system comprises: inkjet printer system 1: generating SINE signals with variable frequency and amplitude, and sending the SINE signals to a crystal oscillation generator 2; crystal oscillation generator 2: generating an MOD signal required by a nozzle vibrator in an ink jet printer; the sampling unit 3: sampling output voltage MOD of the crystal oscillation generator to obtain oscillator voltage MODV, detecting the oscillator voltage MODV in real time by an ink-jet printer system, and sampling oscillator current MODI of the crystal oscillation generator; the comparison unit 4: comparing VREF provided by the ink-jet printer system with the oscillator current MODI; the control unit 5: the crystal oscillator generator is protected according to the result of the comparison unit 4. The technical scheme of the invention uses a hardware closed loop current-limiting detection circuit, can quickly reduce power, software does not need to intervene, and when the load becomes light, the hardware automatically removes current-limiting protection.
Description
Technical Field
The invention relates to the technical field of ink-jet printers, in particular to an automatic current-limiting protection system and method of a crystal oscillator.
Background
The output end of the crystal oscillator is connected with a sampling resistor in series, the sampling resistor is used for sampling the output current of the crystal oscillator, and the output current is compared with the set Value (VREF) after being shaped and amplified. If the comparison result is considered to be overload, the amplitude of the input signal of the crystal oscillator is pulled down so as to achieve the purpose of reducing the output power of the oscillator. Finally, the body oscillation generator is prevented from being overloaded and protected from being damaged. When the sampled output current is reduced, the amplitude of the input signal is recovered, and the crystal oscillator is enabled to recover to work normally.
Disclosure of Invention
The present invention is directed to an automatic current limiting protection system and method for a crystal oscillator.
To achieve the above object, the present invention provides an automatic current limiting protection system for a crystal oscillator, comprising:
an ink jet printer system: generating SINE signals with variable frequency and amplitude, and sending the SINE signals to a crystal oscillator; a crystal oscillator: generating an MOD signal required by a nozzle vibrator in an ink jet printer; a sampling unit: sampling output voltage MOD of the crystal oscillator to obtain oscillator voltage MODV, detecting the oscillator voltage MODV in real time by an ink-jet printer system, and sampling oscillator current MODI of the crystal oscillator; a comparison unit: comparing VREF provided by the ink-jet printer system with the oscillator current MODI; a control unit: and protecting the crystal oscillator according to the comparison unit result.
The invention provides an automatic current-limiting protection method of a crystal oscillator, SINE signals with variable frequency and amplitude generated by a SINE wave generator controlled by an ink-jet printer system are sent to an operational amplifier of the crystal oscillator to be reversely amplified through a high-pass filter, the amplified signals are pushed to a power amplifier, and finally a transformer is pushed by the power amplifier to generate MOD signals required by a nozzle vibrator in the ink-jet printer; when the SINE signal changes the frequency and amplitude value due to the requirement of an ink-jet printer system, and the optimal working condition of the oscillator is tested, or the oscillator is influenced by external force, the equivalent resistance of the oscillator changes along with the change, and the current flowing through the sampling resistor also changes along with the change; collecting weak current flowing through the oscillator, amplifying the weak current in the forward direction, shaping the weak current into pulsating direct current, amplifying the pulsating direct current in the forward direction once, and filtering the pulsating direct current by a low-pass filter to obtain oscillator current MODI; after the output voltage MOD of the crystal oscillator is subjected to voltage division shaping and filtering, amplifying to obtain a vibrator voltage MODV, and detecting the vibrator voltage MODV in real time by an ink jet printer system; comparing the vibrator current MODI with VREF provided by an ink-jet printer system, when the equivalent resistance of the vibrator is larger, the vibrator current MODI is smaller than VREF, and not pulling down a SINE signal; when the equivalent resistance of the oscillator is reduced, the oscillator current MODI is greater than VREF, the amplitude of the SINE is instantly reduced, the MOD voltage is reduced at the same time, the oscillator current MODI is reduced, the overall power of the crystal oscillator is lowered, the power amplifier of the crystal oscillator is protected from overload damage, and the SINE signal is recovered.
The technical scheme of the invention uses a hardware closed loop current-limiting detection circuit, can quickly reduce power, software does not need to intervene, and when the load becomes light, the hardware automatically removes current-limiting protection.
Drawings
FIG. 1 is a schematic block diagram of the present invention;
fig. 2 is a circuit diagram of the technical solution of the present invention.
Detailed Description
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, but all of them are protected by patent law within the scope of the present invention.
Referring to the attached drawings of the specification, the automatic current limiting protection system of the crystal oscillator provided by the invention comprises: inkjet printer system 1: generating SINE signals with variable frequency and amplitude, and sending the SINE signals to a crystal oscillator 2; crystal oscillator 2: generating an MOD signal required by a nozzle vibrator in the ink-jet printer; the sampling unit 3: sampling output voltage MOD of the crystal oscillator to obtain oscillator voltage MODV, detecting the oscillator voltage MODV in real time by an ink-jet printer system, and sampling oscillator current MODI of the crystal oscillator; the comparison unit 4: comparing VREF provided by the ink-jet printer system with the oscillator current MODI; the control unit 5: the crystal oscillator is protected according to the result of the comparison unit 4.
The automatic current-limiting protection method of the crystal oscillator comprises the following steps: a SINE wave generator controlled by an ink-jet printer system 1 generates an SINE signal with variable frequency and amplitude, the SINE signal is sent to an operational amplifier U31C of a crystal oscillator 2 through a high-pass filter composed of R178 and C178 to be reversely amplified, the amplified signal pushes a power amplifier composed of Q15 and Q16, and finally the power amplifier pushes a transformer T2 to generate an MOD signal required by a nozzle oscillator in the ink-jet printer.
When the SINE signal is required to change the frequency and the amplitude value due to the requirement of the ink jet printer system 1 to test the optimal working condition of the oscillator, or the oscillator is influenced by external force, the equivalent resistance of the oscillator changes along with the change, and the current flowing through the sampling resistor R200 also changes along with the change.
The weak current flowing through the vibrator is collected through the R200, is amplified in the forward direction by the U32A, is shaped into pulsating direct current by the U32B, the D24 and the U32C, is amplified in the forward direction by the U32D once, and is filtered by a low-pass filter consisting of the R186 and the C185 to obtain the vibrator current MODI.
After the output voltage MOD of the crystal oscillator 2 is subjected to voltage division, shaping and filtering by R205, R27, C195 and R207, the oscillator voltage MODV is obtained by U31B amplification, and the MODV is detected by the inkjet printer system 1 in real time.
The MODI is sent to pin 3 of U31A, and VREF provided by the ink jet printer system 1 is sent to pin 2 of U31A, and the two are compared. When the equivalent resistance of the oscillator is larger, the MODI is less than VREF, the 1 pin of the VREF is output by comparing the MODI with the VREF through the U31A to obtain-15V, the VREF is isolated by the D40 diode, the Q27 is not conducted, and the SINE signal is not pulled down.
When the equivalent resistance of the oscillator is reduced, MODI > VREF is compared by a U31A to output a pin 1 of the equivalent resistance to obtain +15V, C169 is charged through a D40 diode, current is limited through R203, Q27 is conducted, and the amplitude of SINE is instantly reduced. At the same time, the MOD voltage is also reduced, the MODI current is reduced, the overall power of the crystal oscillator 2 is lowered, and the power amplifier of the crystal oscillator 2 is protected from being damaged by overload.
When the MODI is reduced, the output of the pin 1 of the U31A is-15V, the discharge of the pin C169 is started, the current is continuously supplied to the Q27 through the R203 to enable the Q27 to be conducted, and the Q27 is cut off after the discharge of the pin C169 is finished, so that the SINE is recovered. As long as the vibrator is continuously affected by frequency and amplitude or external force, the equivalent resistance is not changed. The entire protection circuit continues to operate repeatedly. Until the code spraying machine system 1 finds that the voltage is not far from the set value through the MODV, judging the overload protection of the crystal oscillator 2, and finally prompting the fault according to the setting of the code spraying machine system or changing the amplitude and the frequency of the SINE to eliminate the fault.
Claims (1)
1. An automatic current limiting protection method of a crystal oscillator is characterized in that: the automatic current-limiting protection system that includes crystal oscillator, the automatic current-limiting protection system of crystal oscillator includes:
an ink jet printer system: generating SINE signals with variable frequency and amplitude and sending the SINE signals to a crystal oscillator;
a crystal oscillator: generating an MOD signal required by a nozzle vibrator in the ink-jet printer;
a sampling unit: sampling output voltage MOD of the crystal oscillator to obtain oscillator voltage MODV, detecting the oscillator voltage MODV in real time by an ink-jet printer system, and sampling oscillator current MODI of the crystal oscillator;
a comparison unit: comparing VREF provided by the ink-jet printer system with the oscillator current MODI;
a control unit: protecting the crystal oscillator according to the result of the comparison unit;
SINE signals with variable frequency and amplitude generated by a SINE wave generator controlled by an ink-jet printer system are sent to an operational amplifier of a crystal oscillator through a high-pass filter for reverse amplification, the amplified signals are pushed to a power amplifier, and finally a transformer is pushed by the power amplifier to generate MOD signals required by a nozzle vibrator in the ink-jet printer;
when the SINE signal changes the frequency and amplitude value due to the requirement of an ink-jet printer system, and the optimal working condition of the oscillator is tested, or the oscillator is influenced by external force, the equivalent resistance of the oscillator changes along with the change, and the current flowing through the sampling resistor also changes along with the change;
collecting weak current flowing through the oscillator, amplifying the weak current in the forward direction, shaping the weak current into pulsating direct current, amplifying the pulsating direct current in the forward direction once, and filtering the pulsating direct current by a low-pass filter to obtain oscillator current MODI;
after the output voltage MOD of the crystal oscillator is subjected to voltage division shaping and filtering, amplifying to obtain a vibrator voltage MODV, and detecting the vibrator voltage MODV in real time by an ink jet printer system;
comparing the vibrator current MODI with VREF provided by an ink-jet printer system, when the equivalent resistance of the vibrator is larger, the vibrator current MODI is smaller than VREF, and not pulling down a SINE signal;
when the equivalent resistance of the oscillator is small, the oscillator current MODI is greater than VREF, the amplitude of the SINE is instantly reduced, the MOD voltage is reduced at the same time, the oscillator current MODI is reduced, the overall power of the crystal oscillator is reduced, the power amplifier of the crystal oscillator is protected from overload damage, and the SINE signal is recovered.
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| CN202010237561.9A CN111313392B (en) | 2020-03-30 | 2020-03-30 | Automatic current-limiting protection system and method for crystal oscillator |
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| CN202010237561.9A CN111313392B (en) | 2020-03-30 | 2020-03-30 | Automatic current-limiting protection system and method for crystal oscillator |
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| CN111313392B true CN111313392B (en) | 2022-11-25 |
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| CN202997663U (en) * | 2012-12-13 | 2013-06-12 | 周红艳 | Voltage stabilization constant current charging control circuit |
| CN103606897A (en) * | 2013-12-02 | 2014-02-26 | 扬州万方电子技术有限责任公司 | Uninterruptible power supply over-current protection circuit |
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| TW200945718A (en) * | 2008-04-23 | 2009-11-01 | Niko Semiconductor Co Ltd | Switching power supply apparatus with current output limit |
| CN201821553U (en) * | 2010-09-19 | 2011-05-04 | 英飞特电子（杭州）有限公司 | Open-circuit protecting circuit of light emitting diode constant-current driving circuit |
| US8854147B2 (en) * | 2012-10-12 | 2014-10-07 | Google Inc. | Crystal oscillator with electrostatic discharge (ESD) compliant drive level limiter |
| CN204441851U (en) * | 2015-03-31 | 2015-07-01 | 长安大学 | A kind of current foldback circuit |
| CN104882856A (en) * | 2015-05-25 | 2015-09-02 | 重庆大学 | High-precision over-current detection circuit |
| CN106712519A (en) * | 2016-11-18 | 2017-05-24 | 广州视源电子科技股份有限公司 | Switching power supply circuit |
| CN107317314B (en) * | 2017-08-15 | 2019-03-15 | 中国航天时代电子公司 | A kind of solid-state power controller with current-limiting protection and inverse time-lag protection function |
| CN207504768U (en) * | 2017-09-28 | 2018-06-15 | 河南英开电气股份有限公司 | Solid-state power controller |
| CN108177440A (en) * | 2018-02-24 | 2018-06-19 | 广州市印科标识科技有限公司 | A kind of code spraying system |
| CN208707307U (en) * | 2018-04-25 | 2019-04-05 | 广西电友科技发展有限公司 | Testing source circuit |
| CN110797837A (en) * | 2019-11-29 | 2020-02-14 | 鉴丰电子科技有限公司 | Overcurrent protection circuit |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN202997663U (en) * | 2012-12-13 | 2013-06-12 | 周红艳 | Voltage stabilization constant current charging control circuit |
| CN103606897A (en) * | 2013-12-02 | 2014-02-26 | 扬州万方电子技术有限责任公司 | Uninterruptible power supply over-current protection circuit |
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Effective date of registration: 20210609 Address after: 325000 No.3 Dawei Road, Gaoxiang Industrial Zone, Xinqiao street, Ouhai District, Wenzhou City, Zhejiang Province Applicant after: Langdi Technology Co.,Ltd. Address before: 325000 13th floor, 12th floor, 10th floor, No.118 middle juguangyuan Road, high tech Zone, Niushan North Road, Lucheng District, Wenzhou City, Zhejiang Province Applicant before: Zhejiang Langdi Technology Co.,Ltd. |
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