CN114995321A - Detection circuit - Google Patents
Detection circuit Download PDFInfo
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- CN114995321A CN114995321A CN202110229005.1A CN202110229005A CN114995321A CN 114995321 A CN114995321 A CN 114995321A CN 202110229005 A CN202110229005 A CN 202110229005A CN 114995321 A CN114995321 A CN 114995321A
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- 238000001514 detection method Methods 0.000 title claims abstract description 77
- 238000001914 filtration Methods 0.000 claims abstract description 14
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 230000006641 stabilisation Effects 0.000 claims abstract description 8
- 238000011105 stabilization Methods 0.000 claims abstract description 8
- 239000003990 capacitor Substances 0.000 claims description 6
- 102100024485 Cell division cycle-associated protein 7 Human genes 0.000 claims description 3
- 101000980893 Homo sapiens Cell division cycle-associated protein 7 Proteins 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 7
- 238000005070 sampling Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B23/00—Testing or monitoring of control systems or parts thereof
- G05B23/02—Electric testing or monitoring
- G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
- G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
- G05B23/0256—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults injecting test signals and analyzing monitored process response, e.g. injecting the test signal while interrupting the normal operation of the monitored system; superimposing the test signal onto a control signal during normal operation of the monitored system
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24065—Real time diagnostics
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides a detection circuit, which comprises a PWM signal input unit for outputting a PWM signal; the filtering unit filters the PWM signal and supplies power to the PWM voltage-stabilizing output unit; the PWM voltage conversion and stabilization output unit provides constant voltage for the first signal detection unit and the second signal detection unit; the first signal detection unit detects an input PWM signal and converts the input PWM signal into a digital signal; the second signal detection unit is preset with a threshold voltage, and when the voltage detected by the second signal detection unit is smaller than the threshold voltage, the voltage is fed back to the signal feedback unit; the signal feedback unit feeds the voltage value which is detected by the second signal detection unit and is smaller than the threshold voltage back to the MCU receiving and judging unit; the MCU receiving and judging unit compares the signal voltage value detected by the first signal detecting unit with the signal voltage value detected by the second signal detecting unit, and executes the operation process preset by the MCU receiving and judging unit according to the comparison result, so that the periodic interference can be effectively inhibited, and the PWM real-time variation can be accurately acquired.
Description
Technical Field
The invention relates to the technical field of circuits, in particular to a detection circuit suitable for detecting input PWM (pulse width modulation).
Background
The function that present automotive industry realized is more and more, and under the different operating mode circumstances, the light luminance effect that requires the car is different, and in order to reduce the development expense, the BCM of car can fuse the PWM power supply mode of different frequency, different duty cycles, satisfies the luminance change requirement of switching between a plurality of functions.
For a common lamp control unit without MCU diagnosis, the unstable influence of PWM input is small, but the animation effect which needs to detect PWM power supply through the MCU as a judgment basis is very influenced.
The traditional PWM input detection method generally adopts an A/D sampling mode, the detection mode has problems to a certain extent, the A/D sampling cannot inhibit periodic interference, the influence on accidental deviation interference is large, MCU judgment is influenced, real-time variable quantity cannot be accurately acquired, and therefore judgment of an automobile lamp central control system is influenced, and the automobile lamp central control system executes wrong instructions.
Disclosure of Invention
The detection circuit disclosed by the invention solves the problems that the traditional monitoring PWM input adopts an A/D sampling mode, cannot inhibit periodic interference and cannot accurately acquire real-time variable quantity, so that the judgment of a lamp central control system is influenced, and the central control system of an automobile lamp executes wrong instructions, can effectively inhibit the periodic interference and can accurately acquire the PWM real-time variable quantity.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the invention discloses a detection circuit, which comprises a PWM signal input unit, a filtering unit, a PWM voltage-converting and stabilizing output unit, a first signal detection unit, a second signal detection unit, a signal feedback unit and an MCU receiving and judging unit, wherein the PWM signal input unit is used for outputting PWM signals; the filtering unit is used for filtering the PWM signal and supplying power to the PWM voltage-stabilizing output unit; the PWM voltage conversion and stabilization output unit is used for providing constant voltage for the first signal detection unit and the second signal detection unit; the first signal detection unit is used for detecting the input PWM signal and converting the input PWM signal into a digital signal; the second signal detection unit is preset with a threshold voltage, and when the voltage detected by the second signal detection unit is smaller than the threshold voltage, the voltage is fed back to the signal feedback unit; the signal feedback unit feeds the voltage value which is detected by the second signal detection unit and is smaller than the threshold voltage back to the MCU receiving and judging unit; the MCU receiving and judging unit is used for comparing the signal voltage value detected by the first signal detection unit with the signal voltage value detected by the second signal detection unit and executing the operation flow established by the MCU receiving and judging unit according to the comparison result.
Further, in the first signal detection unit, a first pin of a chip U3 is connected to the JPO1 terminal, a second pin of the chip U3 is connected to the-5V terminal through a resistor R21, meanwhile, a second pin of the chip U3 is grounded through a resistor R22, a third pin of the chip U3 is connected to the P-1 terminal through a resistor R23, meanwhile, a third pin of the chip U3 is grounded through a resistor R24, and a fourth pin of the chip U3 is grounded.
Further, in the MCU reception determination unit, a first pin of a chip UD2 is connected to the MC1 terminal, a third pin of the chip UD2 is connected to the +5V terminal, meanwhile, a third pin of the chip UD2 is connected to the ground through a capacitor YC8, a fourth pin of the chip UD2 is connected to the third pin of the chip UD2, a fifth pin of the chip UD2 is connected to the ground, a sixth pin of the chip UD2 is connected to the fifth pin of the chip UD2, a seventh pin of the chip UD2 is connected to the PM2-2 terminal, a ninth pin of the chip UD2 is connected to the MC2 terminal, a tenth pin of the chip UD2 is connected to the +5V terminal through a resistor R1, an eleventh pin of the chip UD2 is connected to the PM 27-1 terminal, a twelfth pin of the chip 2 is connected to the connector 1, a thirteenth pin of the chip UD2 is connected to the JP2 terminal, a seventeenth pin of the chip connector is connected to the UD2, and an eighteenth pin of the chip UD2 is connected to the UD2, the nineteenth pin of the chip UD2 is connected with the TM11 terminal, the twentieth pin of the chip UD2 is connected with the TM10 terminal, the twenty-first pin of the chip UD2 is connected with the TM9 terminal, the twenty-second pin of the chip UD2 is connected with the TM8 terminal, the twenty-third pin of the chip UD2 is connected with the Fault-T2 terminal, and the twenty-fourth pin of the chip UD2 is grounded through a capacitor CD 0.
Further, the U3 is a single power supply dual operational amplifier, which is of the NCV2904 type.
Further, the model number of the UD2 is KEA 8-32.
The beneficial technical effects are as follows:
the invention provides a detection circuit, which comprises a PWM signal input unit, a filtering unit, a PWM voltage-converting and stabilizing output unit, a first signal detection unit, a second signal detection unit, a signal feedback unit and an MCU receiving and judging unit, wherein the PWM signal input unit is used for outputting PWM signals; the filtering unit is used for filtering the PWM signal and supplying power to the PWM voltage-stabilizing output unit; the PWM voltage conversion and stabilization output unit is used for providing constant voltage for the first signal detection unit and the second signal detection unit; the first signal detection unit is used for detecting the input PWM signal and converting the input PWM signal into a digital signal; the second signal detection unit is preset with a threshold voltage, and when the voltage detected by the second signal detection unit is smaller than the threshold voltage, the voltage is fed back to the signal feedback unit; the signal feedback unit feeds the voltage value which is detected by the second signal detection unit and is smaller than the threshold voltage back to the MCU receiving and judging unit; the MCU receiving and judging unit is used for comparing the signal voltage value detected by the first signal detecting unit with the signal voltage value detected by the second signal detecting unit and executing the operation flow established by the MCU receiving and judging unit according to the comparison result, so that the problems that the traditional monitoring PWM input adopts an A/D sampling mode, the periodic interference cannot be inhibited and the real-time variable quantity cannot be accurately acquired, the judgment of a lamp central control system is influenced, and the automobile lamp central control system executes wrong instructions are solved, the periodic interference can be effectively inhibited and the PWM real-time variable quantity can be accurately acquired.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiments will be briefly introduced below.
FIG. 1 is a system block diagram of a detection circuit according to the present invention;
FIG. 2 is a circuit diagram of a first signal detecting unit in the detecting circuit according to the present invention;
FIG. 3 is a circuit diagram of an MCU receiving and determining unit in the detection circuit according to the present invention;
FIG. 4 is a schematic diagram of output waveforms of the P-1 terminal, JP1 terminal and JP2 terminal in the second embodiment of the detection circuit according to the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention discloses a detection circuit, which is shown in figure 1 and comprises a PWM signal input unit, a filtering unit, a PWM voltage conversion and stabilization output unit, a first signal detection unit, a second signal detection unit, a signal feedback unit and an MCU receiving and judging unit, wherein the PWM signal input unit is used for outputting PWM signals; the filtering unit is used for filtering the PWM signal and supplying power to the PWM voltage-stabilizing output unit; the PWM voltage conversion and stabilization output unit is used for providing constant voltage for the first signal detection unit and the second signal detection unit; the first signal detection unit is used for detecting the input PWM signal and converting the input PWM signal into a digital signal; the second signal detection unit is preset with a threshold voltage, and when the voltage detected by the second signal detection unit is smaller than the threshold voltage, the voltage is fed back to the signal feedback unit; the signal feedback unit feeds the voltage value which is detected by the second signal detection unit and is smaller than the threshold voltage back to the MCU receiving and judging unit; the MCU receiving and judging unit is used for comparing the signal voltage value detected by the first signal detection unit with the signal voltage value detected by the second signal detection unit and executing the operation flow established by the MCU receiving and judging unit according to the comparison result.
In the first signal detecting unit, referring to fig. 2, a first pin of a chip U3 is connected to a JPO1 terminal, a second pin of the chip U3 is connected to a-5V terminal through a resistor R21, a second pin of the chip U3 is grounded through a resistor R22, a third pin of the chip U3 is connected to a P-1 terminal through a resistor R23, a third pin of the chip U3 is grounded through a resistor R24, and a fourth pin of the chip U3 is grounded, preferably, the chip U3 is a single-power dual operational amplifier, which is of the type NCV 2904.
In the MCU reception determination unit, referring to fig. 3, a first pin of a chip UD2 is connected to an MC1 terminal, a third pin of the chip UD2 is connected to a +5V terminal, a third pin of the chip UD2 is connected to ground via a capacitor YC8, a fourth pin of the chip UD2 is connected to a third pin of the chip UD2, a fifth pin of the chip UD2 is connected to ground, a sixth pin of the chip UD2 is connected to a fifth pin of the chip UD2, a seventh pin of the chip UD2 is connected to a PM2-2 terminal, a ninth pin of the chip UD2 is connected to an MC2 terminal, a tenth pin of the chip UD2 is connected to a +5V terminal via a resistor R1, an eleventh pin of the chip UD2 is connected to a PM2-1 terminal, a twelfth pin of the chip 2 is connected to an MC1 terminal, a thirteenth pin of the chip connector 2 is connected to a seventeenth pin 8269553 of the JP JVT 826952 terminal, an eighteenth pin of the chip UD2 is connected with a TM12 terminal, a nineteenth pin of the chip UD2 is connected with a TM11 terminal, a twentieth pin of the chip UD2 is connected with a TM10 terminal, a twenty-first pin of the chip UD2 is connected with a TM9 terminal, a twenty-second pin of the chip UD2 is connected with a TM8 terminal, a twenty-third pin of the chip UD2 is connected with a Fault-T2 terminal, and a twenty-fourth pin of the chip UD2 is grounded through a capacitor CD0, preferably, the UD2 is a MCU which is of a KEA8-32 type.
The following describes a detection circuit according to the present invention by several embodiments:
the first embodiment is as follows:
the embodiment is that under the condition that the input PWM voltage sent by the BCM does not meet the normal working range, namely under voltage, the first signal detection unit is divided into P-1V and 5V signal detection, if the preset input voltage uses 5V voltage as a voltage reference value, and if the high level of the input PWM is lower than 5V, the output of JP1 is at low level, and the MCU receiving and judging unit defaults to an invalid value; on the contrary, the voltage is set to be an effective value by default, and other thresholds which can be used as judgment can be set at the voltage.
Example two:
in the second embodiment, when the duty ratio of the PWM input by the BCM is not constant, the unstable duty ratio of the PWM input cannot perform relevant execution actions for the MCU detection, which affects the function implementation.
Under the condition that the duty ratio of the input PWM is unstable, the first signal detection unit detects whether the input PWM works in a set normal working voltage range, for example, the preset voltage is 5V, and is higher than 5V to be a normal working range, the pulse width threshold value of the PWM is set through the detection of the P-1 end, for example, the waveform pulse width of the P-1 end is set as shown in FIG. 4, the pulse width waveform of the JP1 end detected through the first signal detection unit is shown in FIG. 4, the MCU receiving and judging unit counts the pulses meeting the set pulse width threshold value, for JP1 and JP2, the pulse width threshold value continuously exceeding 5 (the counting data can be changed) pulses does not reach the pulse width threshold value designed by the MCU receiving and judging unit, the MCU receiving and judging unit judges that the PWM is invalid, and the MCU receiving and judging unit does not execute a program or executes a program to be determined.
Example three:
in the third embodiment, the welcome position lamp with the PWM power supply mode is used, the PWM power supply mode is unstable for the welcome lamp, the PWM duty ratio is uncertain, and the left and right effects are inconsistent and the phenomena of darkness and darkness are easily caused when the welcome effect is made, so that the experience effect of a user is influenced.
Example four:
in the fourth embodiment, in the case of the power supply in which the BCM input voltage is not lower than 0V in the low level, the basic principle is the same as that in embodiment 1, the first signal detection means is set to use 0V as the low level judgment criterion, and 5V (set threshold) as the high level criterion, and if the low level output from JP1 is not completely equal to 0V, the input PWM is considered to be unstable and is determined to be an invalid value.
The working principle of the detection circuit disclosed by the invention is as follows:
the power supply input conversion is filtered through the filtering unit, so that relatively stable voltage is provided for the PWM voltage conversion and stabilization output unit, and the PWM voltage conversion and stabilization output unit cannot work due to low level is avoided; PWM changes steady voltage output unit and keeps normal work, be about to the different voltage value that the filtering produced changes steady voltage output unit output constant voltage 5V through PWM, first signal detection unit gathers input PWM signal duty ratio and voltage condition, and transmit to MCU and receive the judgement unit, second signal detection unit is connected with signal feedback unit, PWM signal transmission to MCU that will gather receives the judgement unit, compare the data that first signal detection unit and second signal detection unit gathered, thereby the validity of analysis input PWM signal.
The MCU receiving and judging unit collects the duty ratio condition of the first signal detection unit, and when the duty ratio condition meets the threshold voltage set by the second signal detection unit, the MCU executes an effect mode according to the judging logic.
The detection circuit disclosed by the invention solves the problem that the traditional monitoring PWM input adopts an A/D sampling mode, cannot inhibit periodic interference and cannot accurately acquire real-time variable quantity, so that the judgment of a lamp central control system is influenced, and the central control system of an automobile lamp executes wrong instructions, can effectively inhibit the periodic interference and accurately acquire the PWM real-time variable quantity, and can realize logic control under the condition of different input PWM duty ratios under the condition of multiple working conditions.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above examples are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.
Claims (5)
1. A detection circuit, comprising:
a PWM signal input unit for outputting a PWM signal;
the filtering unit is used for filtering the PWM signal and supplying power to the PWM voltage-stabilizing output unit;
the PWM voltage conversion and stabilization output unit is used for providing constant voltage for the first signal detection unit and the second signal detection unit;
a first signal detection unit for detecting the input PWM signal and converting it into a digital signal;
the second signal detection unit is preset with a threshold voltage, and when the voltage detected by the second signal detection unit is smaller than the threshold voltage, the second signal detection unit feeds back the voltage to the signal feedback unit;
the signal feedback unit feeds the voltage value which is detected by the second signal detection unit and is smaller than the threshold voltage back to the MCU receiving and judging unit;
and the MCU receiving and judging unit is used for comparing the signal voltage value detected by the first signal detection unit with the signal voltage value detected by the second signal detection unit and executing the operation flow established by the MCU receiving and judging unit according to the comparison result.
2. The detecting circuit of claim 1, wherein in the first signal detecting unit, a first pin of a chip U3 is connected to JPO1, a second pin of the chip U3 is connected to-5V via a resistor R21, a second pin of the chip U3 is grounded via a resistor R22, a third pin of the chip U3 is connected to P-1 via a resistor R23, a third pin of the chip U3 is grounded via a resistor R24, and a fourth pin of the chip U3 is grounded.
3. The detection circuit according to claim 1, wherein in the MCU receiving judgment unit, a first pin of a chip UD2 is connected with an MC1 terminal, a third pin of the chip UD2 is connected with a +5V terminal, meanwhile, a third pin of the chip UD2 is grounded through a capacitor YC8, a fourth pin of the chip UD2 is connected with a third pin of the chip UD2, a fifth pin of the chip UD2 is grounded, a sixth pin of the chip UD2 is connected with a fifth pin of the chip UD2, a seventh pin of the chip UD2 is connected with a PM2-2 terminal, a ninth pin of the chip UD2 is connected with an MC2 terminal, a tenth pin of the chip UD2 is connected with a +5V terminal through a resistor R1, an eleventh pin of the chip UD2 is connected with a PM2-1 terminal, a twelfth pin of the chip 2 is connected with a JP1 terminal, a thirteenth pin of the chip UD 582 is connected with a JP 69553 terminal, a connector of the chip JVT 8653 is connected with a seventeenth pin 86 2, an eighteenth pin of the chip UD2 is connected with a TM12 terminal, a nineteenth pin of the chip UD2 is connected with a TM11 terminal, a twentieth pin of the chip UD2 is connected with a TM10 terminal, a twenty-first pin of the chip UD2 is connected with a TM9 terminal, a twenty-second pin of the chip UD2 is connected with a TM8 terminal, a twenty-third pin of the chip UD2 is connected with a Fault-T2 terminal, and a twenty-fourth pin of the chip UD2 is grounded through a capacitor CD 0.
4. The detection circuit of claim 1, wherein the U3 is a single power supply dual operational amplifier of type NCV 2904.
5. The detection circuit of claim 1, wherein the UD2 is of the type KEA 8-32.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110229005.1A CN114995321A (en) | 2021-03-02 | 2021-03-02 | Detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110229005.1A CN114995321A (en) | 2021-03-02 | 2021-03-02 | Detection circuit |
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| CN114995321A true CN114995321A (en) | 2022-09-02 |
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| CN202110229005.1A Pending CN114995321A (en) | 2021-03-02 | 2021-03-02 | Detection circuit |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917805A (en) * | 2010-08-09 | 2010-12-15 | 海洋王照明科技股份有限公司 | Led drive circuit |
| CN201937907U (en) * | 2010-12-23 | 2011-08-17 | 上海荣机控制***有限公司 | LED driving power supply for train |
| CN102682696A (en) * | 2011-02-18 | 2012-09-19 | 美格纳半导体有限公司 | Pwm controlling circuit and led driver circuit having same |
| CN210780580U (en) * | 2019-09-12 | 2020-06-16 | 深圳市高梁红电子科技有限公司 | Voltage adaptation circuit and power supply |
| CN214540522U (en) * | 2021-03-02 | 2021-10-29 | 常州星宇车灯股份有限公司 | Detection circuit |
-
2021
- 2021-03-02 CN CN202110229005.1A patent/CN114995321A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101917805A (en) * | 2010-08-09 | 2010-12-15 | 海洋王照明科技股份有限公司 | Led drive circuit |
| CN201937907U (en) * | 2010-12-23 | 2011-08-17 | 上海荣机控制***有限公司 | LED driving power supply for train |
| CN102682696A (en) * | 2011-02-18 | 2012-09-19 | 美格纳半导体有限公司 | Pwm controlling circuit and led driver circuit having same |
| CN210780580U (en) * | 2019-09-12 | 2020-06-16 | 深圳市高梁红电子科技有限公司 | Voltage adaptation circuit and power supply |
| CN214540522U (en) * | 2021-03-02 | 2021-10-29 | 常州星宇车灯股份有限公司 | Detection circuit |
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