CN211955645U - Multichannel circuit for detecting branch current of LED drive circuit - Google Patents
Multichannel circuit for detecting branch current of LED drive circuit Download PDFInfo
- Publication number
- CN211955645U CN211955645U CN202020054678.9U CN202020054678U CN211955645U CN 211955645 U CN211955645 U CN 211955645U CN 202020054678 U CN202020054678 U CN 202020054678U CN 211955645 U CN211955645 U CN 211955645U
- Authority
- CN
- China
- Prior art keywords
- capacitor
- coupled
- circuit
- resistor
- terminal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
The utility model discloses a circuit for detecting branch current of a LED drive circuit by multiple channels, wherein a current sensing circuit is used for collecting the current of each branch of the drive circuit; the signal amplifying and driving circuit is used for amplifying the current signal from the current sensing circuit; the singlechip is used for receiving signals from the signal amplifying and driving circuit; the LCD display module is used for receiving a current signal from the singlechip; the serial port communication module is used for remote communication; the current sensing circuits are arranged in parallel, each current sensing circuit is correspondingly connected to a signal amplifying and driving circuit, the output end of the signal amplifying and driving circuit is connected to the ADC port of the single chip microcomputer, and the LCD display module and the serial port communication module are respectively connected to the single chip microcomputer. The utility model discloses a technique is kept apart completely to the sense terminal, in each branch road electric current of real-time detection, can not cause the interference to LED drive power supply again, the current detection problem among the solution constant current multichannel parallel drive circuit that can be fine.
Description
Technical Field
The utility model relates to a light source circuit technical field, in particular to multichannel detects circuit of LED drive circuit branch road current.
Background
At present, in the high-power LED light source driving industry, such as the UV curing light source industry, most of the high-power LED light source driving industry adopts constant-current multi-path parallel driving, and the adoption of the mode has the greatest advantages of good consistency of light source control effect and effectively solving the defects of poor starting consistency and inconsistent response time when single-power-supply single-string lamp bead driving is adopted.
Due to the fact that the multi-path parallel drive is adopted, another defect is brought, when a certain branch fails, for example, when the branch is open or a lamp bead is short-circuited, the phenomenon of over-current of the certain branch can be caused, the over-current branch can be burnt seriously, and the like, and great loss is brought to a user. One solution is to monitor the current of the circuit in real time and to know the current situation in time.
SUMMERY OF THE UTILITY MODEL
In view of the above technical problems, when a branch fails, such as an open circuit or a short circuit of a lamp bead, an overcurrent phenomenon occurs in the branch, which may lead to a burning-out of the overcurrent branch, and a significant loss is brought to users. The utility model provides a multichannel detects circuit of LED drive circuit branch current.
A circuit for multi-channel detection of branch current of an LED driving circuit comprises:
the current sensing circuit is used for collecting the current of each drive circuit branch;
the signal amplifying and driving circuit is used for amplifying the current signal from the current sensing circuit and transmitting the current signal to the outside;
the singlechip is used for receiving the signal from the signal amplification and driving circuit and transmitting the signal to the outside after calculation;
the LCD display module is used for receiving and displaying the current signal from the singlechip;
the serial port communication module is used for remote communication;
the current sensing circuits are arranged in parallel, each current sensing circuit is correspondingly connected to one signal amplifying and driving circuit, the output end of each signal amplifying and driving circuit is connected to the ADC port of the single chip microcomputer, and the LCD display module and the serial port communication module are respectively connected to the single chip microcomputer.
Furthermore, the current sensing circuit comprises a current sensor chip, an input port of the current sensor chip is used for being connected with branches of each driving circuit, and a GND end of the current sensor chip is grounded; the Filter of the circuit sensor chip is connected with the first end of a first capacitor, and the second end of the first capacitor is grounded; the Vlout end of the circuit sensor chip is connected to the signal amplification and driving circuit, the wiring point of the Vlout end is connected to the first end of a first resistor, and the second end of the first resistor is grounded; the VCC end of the circuit sensor chip is coupled to the first end of a second capacitor, the second end of the second capacitor is grounded, the first end of the second capacitor is coupled to the first end of a third capacitor, the second end of the third capacitor is grounded, and the first end of the third capacitor is provided with a supply voltage input end.
Further, the signal amplifying and driving circuit includes:
a second resistor having a first end coupled to the Vlout end of the sensor chip;
a third resistor, a first end of the third resistor coupled to a second end of the second resistor, a second end of the third resistor connected to ground;
a fourth capacitor, a first end of the fourth capacitor being coupled to the second end of the second resistor, a second end of the fourth capacitor being coupled to the second end of the third resistor;
an amplifier having a positive input coupled to the second terminal of the second resistor and a negative input connected to the output of the amplifier;
a first end of the fourth resistor is coupled to the output end of the amplifier, and a second end of the fourth resistor is connected to an ADC port of the single chip microcomputer;
a fifth capacitor, a first terminal of the fifth capacitor being coupled to the second terminal of the fourth resistor, a second terminal of the fifth capacitor being grounded;
a sixth capacitor, a first end of the sixth capacitor is coupled to the supply voltage input end of the amplifier, the supply voltage input end is connected to a supply voltage, and a second end of the sixth capacitor is grounded.
Further, the serial port communication module comprises an RS232 chip;
the T2in end and the R2out end of the RS232 chip are used for being connected to the single chip microcomputer; the first serial port data transmission resistor and the second serial port data transmission resistor are connected in series respectively;
the GND end of the RS232 chip is grounded;
the VCC end of the RS232 chip is coupled to the first ends of a seventh capacitor and an eighth capacitor, and the second ends of the seventh capacitor and the eighth capacitor are coupled and grounded;
the first end of the eighth capacitor is coupled to the first ends of a ninth capacitor and a tenth capacitor, and the C1-end of the RS232 chip, the second end of the ninth capacitor is coupled to the C1+ end of the RS232 chip, and the second end of the tenth capacitor is coupled to the V + end of the RS232 chip;
a first end of the eleventh capacitor is coupled to a C2+ end of the RS232 chip, and a second end of the eleventh capacitor is coupled to a C2-end of the RS232 chip;
the V-terminal of the RS232 chip is coupled to the first terminal of a twelfth capacitor;
the junction point between the first bidirectional transient voltage suppression diode and the second bidirectional transient voltage suppression diode is coupled to the first end of a thirteenth capacitor, the first end of the thirteenth capacitor is coupled to the first end of a third serial data transmission resistor, the second end of the third serial data transmission resistor is coupled to the T2out end of the RS232 chip, and the second end of the thirteenth capacitor, the second end of the twelfth capacitor and the suspension end of the first bidirectional transient voltage suppression diode are coupled and grounded; a connection point between a second bidirectional transient voltage suppression diode and a third bidirectional transient voltage suppression diode is coupled to a first end of a fourteenth capacitor, a first end of the fourteenth capacitor is coupled to a first end of a fourth serial data transmission resistor, a second end of the fourth serial data transmission resistor is coupled to the R2in end of the RS232 chip, and a second end of the fourteenth capacitor is coupled to a suspension end of the third bidirectional transient voltage suppression diode and grounded; the suspension end of the third bidirectional transient voltage suppression diode, the connection point between the second bidirectional transient voltage suppression diode and the third bidirectional transient voltage suppression diode, and the connection point between the first bidirectional transient voltage suppression diode and the second bidirectional transient voltage suppression diode are respectively connected to three pins of the RS232 communication port, and are respectively connected in series with a self-recovery fuse.
And the power management circuit is connected to the current sensing circuit, the signal amplification and driving circuit, the singlechip, the LCD module and the serial port communication module to supply power.
Further, the power management circuit comprises an external power access port, two pins of the external power access port are respectively connected to a first end and a second end of a fourth bidirectional transient voltage suppression diode, the first end of the fourth bidirectional transient voltage suppression diode is coupled to an anode end of a first transient diode, a cathode end of the first transient diode is coupled to a first end of a fifteenth capacitor, a sixteenth capacitor and a first inductor, the second end of the fourth bidirectional transient voltage suppression diode is coupled to a second end of the fifteenth capacitor and the sixteenth capacitor, and the second end of the sixteenth capacitor is coupled to a first end of a second inductor; the second end of the first inductor is coupled to the first ends of the seventeenth capacitor, the eighteenth capacitor and the nineteenth capacitor, the second end of the second inductor is coupled to the second ends of the seventeenth capacitor, the eighteenth capacitor and the nineteenth capacitor, and the second end and the first end of the nineteenth capacitor are respectively grounded and connected to the Vin end of the first DC-DC power management chip;
the OUT terminal of the first DC-DC power management chip is coupled to the cathode terminal of a second transient diode, the anode terminal of the second transient diode is grounded, the cathode terminal of the second transient diode is coupled to the first terminal of a third inductor, the second terminal of the third inductor is coupled to the first terminals of a twentieth capacitor, a twenty-first capacitor, a fifth resistor and a twenty-second capacitor, the second terminals of the twentieth capacitor and the twenty-first capacitor are grounded, the second terminals of the fifth resistor and the twenty-second capacitor are coupled to each other and to the first terminal of a sixth resistor, the second terminal of the sixth resistor is grounded, and the second terminal of the fifth resistor is coupled to the FB terminal of the first DC-DC power management chip;
a voltage input end is coupled to the first end of the twenty-second capacitor, the voltage input end is coupled to the current sensing circuit and the first end of the twenty-third capacitor, the second end of the twenty-third capacitor is grounded, the first end of the twenty-third capacitor is coupled to the first ends of the first high-frequency magnetic bead and the second high-frequency magnetic bead, the second end of the first high-frequency magnetic bead is connected to the LCD display module, the second end of the second high-frequency magnetic bead is connected to the signal amplifying and driving circuit, the first end of the twenty-third capacitor is connected to the Vin end of the second DC-DC power management chip, the Vout end of the second DC-DC power management chip is coupled to the first ends of the twenty-fourth capacitor and the twenty-fifth capacitor, the second ends of the twenty-fourth capacitor and the twenty-fifth capacitor are grounded, and the first end of the twenty-fifth capacitor is connected to the first end of the third high-frequency magnetic bead, the second end of the third high-frequency magnetic bead is connected to the serial port communication module, and the first end of the twenty-fifth capacitor is coupled to the single chip microcomputer.
Has the advantages that: the utility model discloses novel, the reasonable in design of design, and convenient to use, the utility model discloses a technique is kept apart completely to the sense terminal, in the time of each branch road electric current of real-time detection size, can not cause the interference to LED drive power supply again, and the current detection problem among the solution constant current multichannel parallel drive circuit that can be fine avoids transshipping and causes the harm.
Drawings
Fig. 1 is a circuit structure diagram according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a current sensing circuit according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a signal amplifying and driving circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a power management circuit according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of the serial communication module in an embodiment of the present invention.
Fig. 6 is a circuit diagram of the single chip in an embodiment of the present invention.
Fig. 7 is a circuit diagram of an LCD display module according to an embodiment of the present invention.
Detailed Description
The invention will be further explained with reference to the following figures and examples:
as shown in fig. 1-7, a multi-channel circuit for detecting the branch current of an LED driving circuit includes:
the current sensing circuit is used for collecting the current of each drive circuit branch;
the signal amplifying and driving circuit is used for amplifying the current signal from the current sensing circuit and transmitting the current signal to the outside;
the singlechip is used for receiving the signal from the signal amplification and driving circuit and transmitting the signal to the outside after calculation;
the LCD display module is used for receiving and displaying the current signal from the singlechip;
the serial port communication module is used for remote communication;
the current sensing circuits are arranged in parallel, each current sensing circuit is correspondingly connected to one signal amplifying and driving circuit, the output end of each signal amplifying and driving circuit is connected to the ADC port of the single chip microcomputer, and the LCD display module and the serial port communication module are respectively connected to the single chip microcomputer.
Specifically, the current sensing circuit comprises a current sensor chip IC1, an input port of the current sensor chip IC1 is used for being connected with a branch of each driving circuit, and a GND end of the current sensor chip IC1 is grounded; the Filter of the circuit sensor chip IC1 is terminated with the first end of a first capacitor C12, and the second end of the first capacitor C12 is grounded; the Vlout end of the circuit sensor chip is connected to the signal amplifying and driving circuit, the connection point of the Vlout end is connected to the first end of a first resistor R13, and the second end of the first resistor R13 is grounded; the VCC end of the circuit sensor chip is coupled to the first end of a second capacitor C8, the second end of the second capacitor C8 is grounded, the first end of the second capacitor C8 is coupled to the first end of a third capacitor C7, the second end of the third capacitor C7 is grounded, and the first end of the third capacitor C7 is provided with a supply voltage + V input end.
Specifically, the signal amplifying and driving circuit includes:
a second resistor R10, a first end of the second resistor R10 being coupled to the Vlout end of the sensor chip;
a third resistor R11, a first end of the third resistor R11 being coupled to a second end of the second resistor R10, a second end of the third resistor R11 being grounded;
a fourth capacitor C11, a first terminal of the fourth capacitor C11 being coupled to the second terminal of the second resistor R10, a second terminal of the fourth capacitor C11 being coupled to the second terminal of the third resistor R11;
an amplifier IC3A, a positive input of the amplifier IC3A coupled to the second terminal of the second resistor R10, a negative input of the amplifier IC3A connected to the output of the amplifier IC 3A;
a fourth resistor R12, a first end of the fourth resistor R12 is coupled to the output end of the amplifier IC3A, and a second end of the fourth resistor R12 is connected to the ADC port of the single chip microcomputer;
a fifth capacitor C13, a first terminal of the fifth capacitor C13 being coupled to the second terminal of the fourth resistor R12, a second terminal of the fifth capacitor C13 being grounded;
a sixth capacitor C37, a first terminal of the sixth capacitor C37 is coupled to the supply voltage + VA input terminal of the amplifier IC3A, the supply voltage + VA input terminal is connected to the supply voltage + VA, and a second terminal of the sixth capacitor C37 is grounded.
Specifically, the serial port communication module comprises an RS232 chip IC 6;
the T2in end and the R2out end of the RS232 chip IC6 are used for being connected to the single chip microcomputer; the first serial port data transmission resistor R25 and the second serial port data transmission resistor R28 are respectively connected in series;
the GND end of the RS232 chip IC6 is grounded;
the VCC end of the RS232 chip IC6 is coupled to the first ends of a seventh capacitor C28 and an eighth capacitor C27, and the second ends of the seventh capacitor C28 and the eighth capacitor C27 are coupled and grounded;
a first end of the eighth capacitor C27 is coupled to first ends of a ninth capacitor C29 and a tenth capacitor C31, and a C1-end of the RS232 chip IC6, a second end of the ninth capacitor C29 is coupled to a C1+ end of the RS232 chip IC6, and a second end of the tenth capacitor C31 is coupled to a V + end of the RS232 chip IC 6;
a first end of the eleventh capacitor C33 is coupled to a C2+ end of the RS232 chip IC6, and a second end of the eleventh capacitor C33 is coupled to a C2-end of the RS232 chip IC 6;
the V-terminal of the RS232 chip IC6 is coupled to the first terminal of a twelfth capacitor C35;
the high-voltage power supply further comprises a first bidirectional transient voltage suppression diode D5, a second bidirectional transient voltage suppression diode D6 and a third bidirectional transient voltage suppression diode D7 which are sequentially connected in series, wherein a connection point between the first bidirectional transient voltage suppression diode D5 and the second bidirectional transient voltage suppression diode D6 is coupled to a first end of a thirteenth capacitor C34, a first end of the thirteenth capacitor C34 is coupled to a first end of a third serial data transmission resistor R26, a second end of the third serial data transmission resistor R26 is coupled to a T2out end of the RS232 chip IC6, and a second end of the thirteenth capacitor C34, a second end of the twelfth capacitor C35 and a suspended end of the first bidirectional transient voltage suppression diode D5 are coupled and grounded; a connection point between the second bi-directional transient voltage suppression diode D6 and the third bi-directional transient voltage suppression diode D7 is coupled to a first end of a fourteenth capacitor C36, a first end of the fourteenth capacitor C36 is coupled to a first end of a fourth serial data transmission resistor R27, a second end of the fourth serial data transmission resistor R27 is coupled to an R2in end of the RS232 chip IC6, and a second end of the fourteenth capacitor C36 is coupled to a suspension end of the third bi-directional transient voltage suppression diode D7 and grounded; the suspension end of the third bi-directional transient voltage suppression diode D7, the connection point between the second bi-directional transient voltage suppression diode D6 and the third bi-directional transient voltage suppression diode D7, and the connection point between the first bi-directional transient voltage suppression diode D5 and the second bi-directional transient voltage suppression diode D6 are respectively connected to three pins of the RS232 communication port CN3, and are respectively connected in series with self-recovery fuses FU1, FU2 and FU 3.
The power management circuit is connected to the current sensing circuit, the signal amplification and driving circuit, the single chip microcomputer, the LCD display module and the serial port communication module to supply power.
Specifically, the power management circuit includes an external power access port CN2, two pins of the external power access port CN2 are respectively connected to a first terminal and a second terminal of a fourth bidirectional transient voltage suppression diode D3, the first terminal of the fourth bidirectional transient voltage suppression diode D3 is coupled to an anode terminal of a first transient diode D2, a cathode terminal of the first transient diode D2 is coupled to first terminals of a fifteenth capacitor C17, a sixteenth capacitor C18 and a first inductor L1, the second terminal of the fourth bidirectional transient voltage suppression diode D3 is coupled to second terminals of the fifteenth capacitor C17 and a sixteenth capacitor C18, and the second terminal of the sixteenth capacitor C18 is coupled to the first terminal of a second inductor; a second end of the first inductor L1 is coupled to first ends of a seventeenth capacitor C19, an eighteenth capacitor C21 and a nineteenth capacitor C20, a second end of the second inductor is coupled to second ends of a seventeenth capacitor C19, an eighteenth capacitor C21 and a nineteenth capacitor C20, and a second end and a first end of the nineteenth capacitor C20 are respectively grounded and connected to a Vin end of the first DC-DC power management chip IC 4;
the OUT terminal of the first DC-DC power management chip IC4 is coupled to the cathode terminal of a second transient diode D4, the anode terminal of a second transient diode D4 is grounded, the cathode terminal of the second transient diode D4 is coupled to the first terminal of a third inductor L2, the second terminal of the third inductor L2 is coupled to the first terminals of a twentieth capacitor C25, a twenty-first capacitor C26, a fifth resistor R24 and a twenty-second capacitor C16, the second terminals of the twentieth capacitor C25 and the twenty-first capacitor C26 are grounded, the second terminals of the fifth resistor R24 and the twenty-second capacitor C16 are coupled to each other and to the first terminal of a sixth resistor R23, the second terminal of the sixth resistor R23 is grounded, and the second terminal of the fifth resistor R24 is coupled to the FB terminal of the first DC-DC power management chip IC 4;
a voltage input terminal is coupled to a first terminal of the twenty-second capacitor C16, the voltage input terminal is coupled to first terminals of the current sensing circuit and a twenty-third capacitor C23, a second terminal of the twenty-third capacitor C23 is grounded, a first terminal of the twenty-third capacitor C23 is coupled to first terminals of a first high frequency bead F1 and a second high frequency bead F2, a second terminal + VX of the first high frequency bead F1 is coupled to the LCD display module, a second terminal + VA of the second high frequency bead F2 is coupled to the signal amplifying and driving circuit, a first terminal of the twenty-third capacitor C23 is coupled to a Vin terminal of the second DC-DC power management chip IC5, a Vout terminal of the second DC-DC power management chip IC5 is coupled to first terminals of a twenty-fourth capacitor C24 and a twenty-fifth capacitor C22, and second terminals of the twenty-fourth capacitor C24 and the twenty-fifth capacitor C22 are grounded, the first end of the twenty-fifth capacitor C22 is connected to the first end of a third high-frequency magnetic bead F3, the second end + VR of the third high-frequency magnetic bead F3 is connected to the serial port communication module, and the first end of the twenty-fifth capacitor C22 is coupled to the single chip microcomputer.
Fig. 1 is a block diagram of the circuit configuration of the whole circuit system, the power distribution and management of the whole circuit system is from the power management circuit (fig. 4, a DC-DC circuit), and the current sensing circuit (fig. 2) is responsible for testing the current of each branch circuit and converting the flow of the current in the branch circuit into a voltage value, and each current value can generate a corresponding voltage value. The voltage is amplified by a signal amplifying and driving circuit (figure 3), the signal amplifying and driving circuit (figure 3) is mainly used for amplifying a weak voltage signal output by the current sensor, the driving capability of the signal is enhanced, the amplified voltage signal is transmitted to an ADC acquisition port (ADC1-ADC8) of a main control circuit (figure 6, namely a single chip microcomputer), the main control circuit (figure 6) calculates port signals of the ADC1-ADC8 in real time, the voltage value of the ADC port is converted into a current value, and meanwhile, the calculated current information is transmitted to an LCD display module (figure 7). The LCD display module can display the current value of each branch in real time. While the LCD is displaying, the main control circuit (fig. 6) will also query or read the data in the form of RS232 communication (fig. 5), so that the user can read the current value of each branch circuit in a remote manner.
Fig. 2 is a schematic diagram of a current sensing circuit, in which an IC1 is a current sensor chip, and a complete isolation technique is implemented between a test terminal and a chip signal terminal by using a hall current sensing principle. C7 and C8 are power supply filter capacitors for filtering high-frequency signals in a power supply, C12 is a chip internal signal bypass capacitor for filtering high-frequency signals in the signals, and R13 is a chip output port load resistor.
Fig. 3 is a schematic diagram of signal amplification and driving, IC3A is a high-speed operational amplifier, C37 is a chip power supply high-frequency filter capacitor, R10, R11, and C11 form an input voltage division and filter network, which can perform equal-ratio reduction on the voltage signal output by the sensor, and the operational amplifier and the peripheral circuit form an equal-ratio amplifier. The R12 and the C13 form an operational amplifier output filter network, and high-frequency stray signals from a power supply at an output end can be filtered.
Fig. 4 is a schematic diagram of power management, which is responsible for converting the input voltage to the voltage required by each circuit to operate. IC4, IC5 are DCDC management chips, CN2 is the external power input port, D3 is the transient suppression diode, which is used to protect the power management circuit from being burnt out by the influence of external high voltage, when the voltage of the high voltage transient suppression diode is input into the power port, the diode is conducted and limits the rise of the port voltage, playing the role of clamping. The C17, the C18, the L1, the C19 and the C21 form a pi-shaped filter network which is used for filtering clutter signals in an external power supply, eliminating interference in an external power supply pair, and simultaneously inhibiting the clutter signals on the circuit board from being transmitted to the external power supply to interfere normal work of other circuits. D4, L2, C25 and C26 are filtering and freewheeling diodes of a power management chip, and realize the storage of electric energy. C16, R23, R24 are voltage sampling circuits of the power management chip, and can set the output voltage value of the chip. IC5 is linear voltage-stabilizing circuit, C23, C24, C22 are filtering capacitors, mainly realize the storage of electric energy and the filtering action of power, F1, F2, F3 are high frequency magnetic beads, are used for filtering high frequency signals.
Fig. 5 is an RS232 communication schematic diagram, and mainly functions to convert a signal sent by an RS232 serial port of a computer into a TTL level that can be recognized by a single chip microcomputer. FU1, FU2, FU3 are self-restoring fuses, prevent external signal short circuit, play an automatic open's guard action. D5, D6 and D7 are transient suppression diodes which play a role of voltage clamping when the RS232 communication port (CN3) is subjected to external static electricity or high voltage, and can protect the RS232 chip (IC6) from being broken down by external high voltage signals. C34 and C36 are high-frequency filter circuits which can filter high-frequency signals in the RS232 port. C29, C31, C33 and C35 are energy storage capacitors for TTL level conversion, C27 and C28 are power supply filter capacitors for IC6(RS232), and R25 and R28 are serial data transmission resistors and play roles in signal coupling and signal vibration elimination.
Fig. 6 is a schematic diagram of a main control circuit, and the inside of the main control circuit can convert voltage signals of ADC ports 1 to 8 into branch current information collected by a current sensor through a program algorithm, and then send the information to an LCD display module circuit for displaying the current information and transmitting the current information to an RS 232.
Fig. 7 is a schematic diagram of an LCD display module, the LCD display screen adopts an integrated modular dot matrix display screen, and the main control circuit sends data to enable the LCD to display current information of each branch circuit, so that a user can conveniently check the current data.
In conjunction with all the above specific embodiments, as shown in fig. 1 to 7, the current sensing circuit is used to collect the current of the electrical branches of each driving circuit, specifically, one branch corresponds to one current sensing circuit. The collected current is amplified and driven by a signal amplification and driving circuit and is transmitted to a singlechip. The single chip microcomputer collects signals, operates and processes the signals, then sends the representation signals of the current magnitude to the LCD display module for display, and can also carry out remote communication and data transmission through the serial port communication module. The power management circuit supplies power to the current sensing circuit, the signal amplification and driving circuit, the single chip microcomputer, the LCD display module and the serial port communication module, and in the circuit, high-frequency signals are filtered through the high-frequency magnetic beads.
In conjunction with the above embodiments, embodiments are also presented in terms of detection methods.
A detection method for detecting the circuit of the branch current of the LED driving circuit by adopting the multi-channel circuit comprises the following steps:
s100, connecting a plurality of current sensing circuits to branches of an LED driving circuit, wherein the branch of one LED driving circuit is correspondingly connected to one current sensing circuit, and the circuit sensing circuit collects the current of the corresponding branch of the LED driving circuit;
s200, the current sensing circuit transmits the acquired current signal to the signal amplification and driving circuit, amplifies the signal, and transmits the amplified signal to the single chip microcomputer after driving;
s300, the single chip microcomputer calculates signals obtained from the signal amplification and driving circuit;
and S400, the single chip microcomputer transmits the signals acquired and calculated in the previous step to the LCD display module and the serial port communication module for display and outward communication transmission respectively.
Further, in the step S100, the current signal transmitted to the current sensor chip is filtered by the first capacitor to remove a high-frequency signal in the signal current, and is filtered by the filter circuit formed by the second capacitor and the third capacitor to remove a high-frequency signal in the power supply.
Further, in the step S200, the second resistor, the third resistor, and the fourth capacitor form an input voltage dividing and filtering circuit to reduce the received voltage in an equal ratio, and then amplify the received voltage in an equal ratio through the amplifier, and then filter the signal output through the fourth resistor and the fifth capacitor, so as to filter the high-frequency stray signal.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (6)
1. A circuit for multi-channel detection of branch current of an LED driving circuit is characterized by comprising:
the current sensing circuit is used for collecting the current of each drive circuit branch;
the signal amplifying and driving circuit is used for amplifying the current signal from the current sensing circuit and transmitting the current signal to the outside;
the singlechip is used for receiving the signal from the signal amplification and driving circuit and transmitting the signal to the outside after calculation;
the LCD display module is used for receiving and displaying the current signal from the singlechip;
the serial port communication module is used for remote communication;
the current sensing circuits are arranged in parallel, each current sensing circuit is correspondingly connected to one signal amplifying and driving circuit, the output end of each signal amplifying and driving circuit is connected to the ADC port of the single chip microcomputer, and the LCD display module and the serial port communication module are respectively connected to the single chip microcomputer.
2. The circuit for multi-channel detection of the current of the branches of the LED driving circuits according to claim 1, wherein the current sensing circuit comprises a current sensor chip, an input port of the current sensor chip is used for being connected with the branch of each driving circuit, and a GND (ground) end of the current sensor chip is grounded; the Filter of the circuit sensor chip is connected with the first end of a first capacitor, and the second end of the first capacitor is grounded; the Vlout end of the circuit sensor chip is connected to the signal amplification and driving circuit, the wiring point of the Vlout end is connected to the first end of a first resistor, and the second end of the first resistor is grounded; the VCC end of the circuit sensor chip is coupled to the first end of a second capacitor, the second end of the second capacitor is grounded, the first end of the second capacitor is coupled to the first end of a third capacitor, the second end of the third capacitor is grounded, and the first end of the third capacitor is provided with a supply voltage input end.
3. The circuit for multi-channel detection of the branch current of the LED driving circuit according to claim 2, wherein the signal amplifying and driving circuit comprises:
a second resistor having a first end coupled to the Vlout end of the sensor chip;
a third resistor, a first end of the third resistor coupled to a second end of the second resistor, a second end of the third resistor connected to ground;
a fourth capacitor, a first end of the fourth capacitor being coupled to the second end of the second resistor, a second end of the fourth capacitor being coupled to the second end of the third resistor;
an amplifier having a positive input coupled to the second terminal of the second resistor and a negative input connected to the output of the amplifier;
a first end of the fourth resistor is coupled to the output end of the amplifier, and a second end of the fourth resistor is connected to an ADC port of the single chip microcomputer;
a fifth capacitor, a first terminal of the fifth capacitor being coupled to the second terminal of the fourth resistor, a second terminal of the fifth capacitor being grounded;
a sixth capacitor, a first end of the sixth capacitor is coupled to the supply voltage input end of the amplifier, the supply voltage input end is connected to a supply voltage, and a second end of the sixth capacitor is grounded.
4. The multi-channel circuit for detecting the current of the LED driving circuit branch as claimed in claim 3, wherein the serial port communication module comprises an RS232 chip;
the T2in end and the R2out end of the RS232 chip are used for being connected to the single chip microcomputer; the first serial port data transmission resistor and the second serial port data transmission resistor are connected in series respectively;
the GND end of the RS232 chip is grounded;
the VCC end of the RS232 chip is coupled to the first ends of a seventh capacitor and an eighth capacitor, and the second ends of the seventh capacitor and the eighth capacitor are coupled and grounded;
the first end of the eighth capacitor is coupled to the first ends of a ninth capacitor and a tenth capacitor, and the C1-end of the RS232 chip, the second end of the ninth capacitor is coupled to the C1+ end of the RS232 chip, and the second end of the tenth capacitor is coupled to the V + end of the RS232 chip;
a first end of an eleventh capacitor is coupled to the C2+ end of the RS232 chip, and a second end of the eleventh capacitor is coupled to the C2-end of the RS232 chip;
the V-terminal of the RS232 chip is coupled to the first terminal of a twelfth capacitor;
the junction point between the first bidirectional transient voltage suppression diode and the second bidirectional transient voltage suppression diode is coupled to the first end of a thirteenth capacitor, the first end of the thirteenth capacitor is coupled to the first end of a third serial data transmission resistor, the second end of the third serial data transmission resistor is coupled to the T2out end of the RS232 chip, and the second end of the thirteenth capacitor, the second end of the twelfth capacitor and the suspension end of the first bidirectional transient voltage suppression diode are coupled and grounded; a connection point between a second bidirectional transient voltage suppression diode and a third bidirectional transient voltage suppression diode is coupled to a first end of a fourteenth capacitor, a first end of the fourteenth capacitor is coupled to a first end of a fourth serial data transmission resistor, a second end of the fourth serial data transmission resistor is coupled to the R2in end of the RS232 chip, and a second end of the fourteenth capacitor is coupled to a suspension end of the third bidirectional transient voltage suppression diode and grounded; the suspension end of the third bidirectional transient voltage suppression diode, the connection point between the second bidirectional transient voltage suppression diode and the third bidirectional transient voltage suppression diode, and the connection point between the first bidirectional transient voltage suppression diode and the second bidirectional transient voltage suppression diode are respectively connected to three pins of the RS232 communication port, and are respectively connected in series with a self-recovery fuse.
5. The circuit for detecting the current of the LED driving circuit branch circuit according to any one of claims 1 to 4, further comprising a power management circuit, wherein the power management circuit is connected to the current sensing circuit, the signal amplifying and driving circuit, the single chip microcomputer, the LCD display module and the serial port communication module to supply power.
6. The multi-channel circuit for detecting the branch current of the LED driving circuit according to claim 5, wherein the power management circuit comprises an external power access port, two pins of the external power access port are respectively connected to a first terminal and a second terminal of a fourth bi-directional transient voltage suppression diode, the first terminal of the fourth bi-directional transient voltage suppression diode is coupled to an anode terminal of a first transient diode, a cathode terminal of the first transient diode is coupled to first terminals of a fifteenth capacitor, a sixteenth capacitor and a first inductor, the second terminal of the fourth bi-directional transient voltage suppression diode is coupled to second terminals of the fifteenth capacitor and the sixteenth capacitor, and the second terminal of the sixteenth capacitor is coupled to the first terminal of a second inductor; the second end of the first inductor is coupled to the first ends of the seventeenth capacitor, the eighteenth capacitor and the nineteenth capacitor, the second end of the second inductor is coupled to the second ends of the seventeenth capacitor, the eighteenth capacitor and the nineteenth capacitor, and the second end and the first end of the nineteenth capacitor are respectively grounded and connected to the Vin end of the first DC-DC power management chip;
the OUT terminal of the first DC-DC power management chip is coupled to the cathode terminal of a second transient diode, the anode terminal of the second transient diode is grounded, the cathode terminal of the second transient diode is coupled to the first terminal of a third inductor, the second terminal of the third inductor is coupled to the first terminals of a twentieth capacitor, a twenty-first capacitor, a fifth resistor and a twenty-second capacitor, the second terminals of the twentieth capacitor and the twenty-first capacitor are grounded, the second terminals of the fifth resistor and the twenty-second capacitor are coupled to each other and to the first terminal of a sixth resistor, the second terminal of the sixth resistor is grounded, and the second terminal of the fifth resistor is coupled to the FB terminal of the first DC-DC power management chip;
a voltage input end is coupled to the first end of the twenty-second capacitor, the voltage input end is coupled to the current sensing circuit and the first end of the twenty-third capacitor, the second end of the twenty-third capacitor is grounded, the first end of the twenty-third capacitor is coupled to the first ends of the first high-frequency magnetic bead and the second high-frequency magnetic bead, the second end of the first high-frequency magnetic bead is connected to the LCD display module, the second end of the second high-frequency magnetic bead is connected to the signal amplifying and driving circuit, the first end of the twenty-third capacitor is connected to the Vin end of the second DC-DC power management chip, the Vout end of the second DC-DC power management chip is coupled to the first ends of the twenty-fourth capacitor and the twenty-fifth capacitor, the second ends of the twenty-fourth capacitor and the twenty-fifth capacitor are grounded, and the first end of the twenty-fifth capacitor is connected to the first end of the third high-frequency magnetic bead, the second end of the third high-frequency magnetic bead is connected to the serial port communication module, and the first end of the twenty-fifth capacitor is coupled to the single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020054678.9U CN211955645U (en) | 2020-01-12 | 2020-01-12 | Multichannel circuit for detecting branch current of LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020054678.9U CN211955645U (en) | 2020-01-12 | 2020-01-12 | Multichannel circuit for detecting branch current of LED drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211955645U true CN211955645U (en) | 2020-11-17 |
Family
ID=73181122
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020054678.9U Active CN211955645U (en) | 2020-01-12 | 2020-01-12 | Multichannel circuit for detecting branch current of LED drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211955645U (en) |
-
2020
- 2020-01-12 CN CN202020054678.9U patent/CN211955645U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN2786758Y (en) | Hollow core coils current mutual inductor based on digital accumulated scores | |
| CN111122960A (en) | Circuit and method for multi-channel detection of branch current of LED driving circuit | |
| CN109932619B (en) | Secondary signal collector of electronic sensor of power distribution network | |
| CN211955645U (en) | Multichannel circuit for detecting branch current of LED drive circuit | |
| CN102710248A (en) | Isolated voltage acquisition circuit | |
| CN209014646U (en) | The current detection circuit and electric machine controller of direct measuring type Hall sensor | |
| CN209894959U (en) | High-common-mode-interference-resistance small-signal isolation sampling conditioning circuit of electronic transformer | |
| CN208334493U (en) | A kind of current collection circuit for cell management system of electric automobile | |
| CN211375008U (en) | Series cascade circuit for fault detection of high-voltage battery management system | |
| CN202678082U (en) | Electronic transformer collector with overcurrent and overvoltage prevention function | |
| CN205450154U (en) | A device for test of common mode conducted disturbance noise immunity | |
| CN213302351U (en) | Residual current collecting device of low-voltage alternating-current power supply system of transformer substation | |
| CN202393824U (en) | Arrester signal acquisition device for protecting series compensation capacitor | |
| CN205584011U (en) | Vehicle mounted power circuit | |
| CN2445334Y (en) | On-line monitoring device for current leakage of lightning protector | |
| CN217276296U (en) | Vibration characteristic data monitoring circuit for mining intrinsic safety type fault monitoring equipment | |
| CN205982398U (en) | Converter is direct current voltage detection circuit for module | |
| CN106100128B (en) | Monitoring device is isolated in active power distribution network intelligent terminal accumulator | |
| CN109115962A (en) | Air detection instrument with positioning function | |
| CN217607696U (en) | Multi-path isolated output VPX bus power supply | |
| CN217427771U (en) | Intelligent online monitoring system for state of power equipment based on pulse signals | |
| CN220207823U (en) | High-voltage power supply monitoring PCB of laser equipment | |
| CN203241481U (en) | Middle-high voltage open-phase detecting alarm | |
| CN211402664U (en) | Alternating current flees into direct current system fault detection appearance | |
| CN217112478U (en) | Extensible electrical quantity acquisition module suitable for power conversion system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |