CN212163775U - LED display driving system - Google Patents
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- CN212163775U CN212163775U CN202020468927.9U CN202020468927U CN212163775U CN 212163775 U CN212163775 U CN 212163775U CN 202020468927 U CN202020468927 U CN 202020468927U CN 212163775 U CN212163775 U CN 212163775U
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Abstract
The utility model provides a LED display driving system, it includes LED electric quantity display module, detection module, drive circuit module and drive control module, detection module is connected with LED electric quantity display module's first port and second port electricity respectively, detects first magnitude of voltage and second magnitude of voltage simultaneously, judges the circuit type of LED electric quantity display module according to the predetermined rule and produces the testing result rather than corresponding; the driving circuit module is pre-stored with a plurality of driving circuit units, and the driving circuit units generate driving signals and output the driving signals to the LED electric quantity display module; the drive control module is used for disconnecting the drive circuit module from the LED electric quantity display module when the system is powered on and started, and is also used for receiving the detection result and selecting the drive circuit unit corresponding to the detection result. Compared with the prior art, adopt the utility model discloses a but LED display drive system automatic identification outside different LED lamp connection realizes chooseing for use drive circuit, product usage extensively and user experience good.
Description
[ technical field ] A method for producing a semiconductor device
The utility model relates to an integrated circuit technical field especially relates to a LED display driving system.
[ background of the invention ]
Along with power technology development, on products such as portable power source, smart machine's storehouse of charging, for the more convenient electric quantity of understanding the battery of user, generally adopt the LED to show the electric quantity of instruction battery. Among them, a driving circuit for driving the LED display is an important circuit.
At present, there are various LED display schemes, and user requirements are different, and different LED display schemes generate different indication requirements, for example, in a four-LED lamp mode circuit, four LED lamps are adopted to divide the displayed electric quantity into four segments, so that the electric quantity of a battery can be accurately indicated; and under the mode circuit of one LED lamp, only one LED lamp is needed to indicate whether the battery is electrified. The chip of the applied LED display scheme is limited by the package and volume, and the number of pins of the chip is generally two.
However, in the current LED display scheme, there are two pins of the chip, the number of LED lamps in the LED display scheme is one to four, and the driving circuits corresponding to the number of LED lamps in each scheme are all corresponding individually. When different LED display schemes appear, the system of the same driving circuit cannot be used for driving display, and a user needs to confirm whether the chip provides the corresponding driving circuit again after selecting the LED display scheme (namely the requirement of the number of LED lamps); if a corresponding scheme (i.e., a scheme of a driving circuit related to the number of LED lamps) is not provided, the corresponding chip needs to be replaced, which results in an increase in the working time of the user and an increase in the workload of the user.
Therefore, there is a need to provide a new device to solve the above technical problems.
[ Utility model ] content
The utility model aims at overcoming above-mentioned technical problem, provide a but the wide LED display driving system of drive circuit, product usage is chooseed for use in the realization of the outside different LED lamp connection of automatic identification.
In order to achieve the above object, the present invention provides a LED display driving system, which includes:
the LED electric quantity display module comprises a first port and a second port and is used for displaying LED electric quantity;
the detection module is respectively electrically connected with a first port and a second port of the LED electric quantity display module, detects the first port and the second port to detect a first voltage value corresponding to the first port and a second voltage value corresponding to the second port, judges the circuit type of the LED electric quantity display module according to the first voltage value and the second voltage value and preset rules, and generates a detection result corresponding to the circuit type;
the driving circuit module is prestored with a plurality of driving circuit units respectively corresponding to different detection results, generates a driving signal and outputs the driving signal to the LED electric quantity display module, and the driving signal is used for controlling the LED electric quantity display module to display LED electric quantity;
the driving control module is used for disconnecting the driving circuit module from the LED electric quantity display module when the LED display driving system is powered on and started, and is also used for receiving the detection result, selecting the driving circuit unit corresponding to the detection result according to the detection result, and then electrically connecting the selected driving circuit unit with the first port and the second port respectively.
Preferably, the detection module compares the first voltage value with a first reference voltage to generate a first digital signal, compares the first voltage value with a second reference voltage to generate a second digital signal, compares the second voltage value with the first reference voltage to generate a third digital signal, compares the second voltage value with the second reference voltage to generate a fourth digital signal, compares the first voltage value with a VLED2-VOS to generate a fifth digital signal, and compares the generated first digital signal, the second digital signal, the third digital signal, the fourth digital signal and the fifth digital signal with a preset comparison table to determine the circuit type;
wherein the content of the first and second substances,
VLED2 is the second voltage value, VOS is the voltage deviation value of the same type of LED lamp;
v1 is a voltage value of the first reference voltage, and satisfies GND < V1< VDIO;
v2 is a voltage value of the second reference voltage, and satisfies VDIO < V2< VCC.
Preferably, the circuit type comprises one LED lamp mode circuit, two LED lamp mode circuits, three LED lamp mode circuits, four LED lamp mode circuits and an X mode circuit;
the preset rule is as follows:
when the VLED1 is GND and the VLED2 is VDIO, the circuit type is determined as the one LED lamp mode circuit;
when the VLED1 is VCC and the VLED2 is VDIO, the circuit type is determined to be the two LED lamp mode circuit;
when VLED1 is VDIO and VLED2 is VCC, the circuit type is determined to be the three LED lamp mode circuit;
when the VLED1 is VDIO, the VLED2 is2 VDIO, and the VLED1< VLED2-VOS are simultaneously satisfied, the circuit type is determined as the three LED lamp mode circuit;
when the VLED1 is VDIO, the VLED2 is VDIO, and VLED1 is larger than or equal to VLED2-VOS, the circuit type is judged to be the four-LED lamp mode circuit;
when the VLED2 is GND, the circuit type is determined to be the X-mode circuit;
the first port and the second port respectively pull up pins through an internal current source so that the first voltage value and the second voltage value are pulled up to a power supply voltage when the pins float;
VLED1 is the first voltage value, GND is the ground voltage of the first port and the ground voltage of the second port, VDIO is the voltage value of the LED lamp when the first port or the second port is grounded through the LED lamp, and VCC is the supply voltage.
Preferably, the detection module includes a first current source, a second current source, a first voltage source, a second voltage source, a third voltage source, a fourth voltage source, a fifth voltage source, a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator and a judgment circuit unit;
an input end of the first current source is connected to a power supply voltage, and an output end of the first current source is respectively connected to a positive input end of the first comparator, a positive input end of the second comparator and the first port;
the negative input end of the first comparator is connected to the positive end of the first voltage source, and the output end of the first comparator is connected to the first input end of the judgment circuit unit;
the negative input end of the second comparator is connected to the positive end of the second voltage source, and the output end of the second comparator is connected to the second input end of the judgment circuit unit;
the negative electrode end of the first voltage source, the negative electrode end of the second voltage source, the negative electrode end of the third voltage source and the negative electrode end of the fourth voltage source are all connected to the ground;
an input end of the second current source is connected to a power supply voltage, and an output end of the second current source is respectively connected to a positive input end of the third comparator, a positive input end of the fourth comparator, a positive end of the fifth voltage source, and the second port;
the negative input end of the third comparator is connected to the positive end of the third voltage source, and the output end of the third comparator is connected to the third input end of the judgment circuit unit;
the negative input end of the fourth comparator is connected to the positive end of the fourth voltage source, and the output end of the fourth comparator is connected to the fourth input end of the judgment circuit unit;
a positive input end of the fifth comparator is connected to a negative end of the fifth voltage source, a negative input end of the fifth comparator is connected to the first port, and an output end of the fifth comparator is connected to a fourth input end of the judgment circuit unit;
the first output end of the judgment circuit unit, the second output end of the judgment circuit unit, the third output end of the judgment circuit unit, the fourth output end of the judgment circuit unit and the fifth output end of the judgment circuit unit are all connected to the drive control module;
wherein the judging circuit unit comprises the comparison table.
Preferably, the judging circuit unit is a digital circuit.
Preferably, the voltage value of the output of the fifth voltage source is VOS.
Preferably, when the first output end outputs a valid signal, the circuit type is determined as the LED lamp mode circuit;
when the second output end outputs an effective signal, the circuit type is judged to be the two LED lamp mode circuits;
when the third output end outputs an effective signal, the circuit type is judged to be the three LED lamp mode circuits;
when the fourth output end outputs an effective signal, the circuit type is judged to be the four LED lamp mode circuits;
when the fifth output end outputs an effective signal, the circuit type is judged as the X-mode circuit.
Compared with the prior art, when the LED display driving system is started by electrifying the system, the driving control module disconnects the driving circuit module from the LED electric quantity display module; then, the detection module is respectively and electrically connected with a first port and a second port of the LED electric quantity display module, the first port and the second port are detected simultaneously to measure a first voltage value corresponding to the first port and a second voltage value corresponding to the second port, the circuit type of the LED electric quantity display module is judged according to the first voltage value and the second voltage value and a preset rule, and a detection result corresponding to the circuit type is generated according to the circuit type; receiving the detection result by using the drive control module, selecting a drive circuit unit corresponding to the detection result according to the detection result, and electrically connecting the selected drive circuit unit with the first port and the second port respectively; and generating a driving signal by using the selected driving circuit unit, and outputting the driving signal to the LED electric quantity display module. The utility model discloses LED shows actuating system is through detecting first port with the second port, through examining out first magnitude of voltage with the second magnitude of voltage is judged LED power display module's circuit type selects the drive circuit unit that corresponds with it according to the testing result again to but the realization automatic identification outside different LED lamp connects the method, thereby chooses for use drive circuit for use automatically and makes product usage wide and user experience good.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:
fig. 1 is a block diagram of the LED display driving system of the present invention;
fig. 2 is a circuit block diagram of the detection module of the LED display driving system of the present invention;
fig. 3 is a circuit diagram of an LED lamp mode circuit of the LED display driving system of the present invention;
fig. 4 is a circuit diagram of two LED lamp mode circuits of the LED display driving system of the present invention;
fig. 5 is a circuit diagram of three LED lamp mode circuits of the LED display driving system of the present invention;
fig. 6 is a circuit diagram of four LED lamp mode circuits of the LED display driving system of the present invention;
fig. 7 is a circuit diagram of an X-mode circuit of the LED display driving system of the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1-2, the present invention further provides an LED display driving system 100. The LED display driving system 100 includes an LED electric quantity display module 1, a driving circuit module 2, a detection module 3, and a driving control module 4.
The LED power display module 1 includes a first port 11 and a second port 12. The LED electric quantity display module 1 is used for displaying LED electric quantity. The LED electric quantity display module 1 comprises a plurality of circuit types for displaying LED electric quantity.
In this embodiment, the circuit types include one LED lamp mode circuit, two LED lamp mode circuits, three LED lamp mode circuits, four LED lamp mode circuits, and an X mode circuit.
Referring to fig. 3, a circuit structure 101 of an LED lamp mode circuit is: the first port 11 is connected to the ground GND, and the second port 12 is connected to the ground through the series first LED lamp D1.
Referring to fig. 4, the circuit structure 102 of the two LED lamp mode circuits is: the first port 11 is connected to a power supply voltage VCC through a series third LED lamp D3, and the second port 12 is grounded through a series third LED lamp D3.
Referring to fig. 5, the circuit structure 103 of the three LED lamp mode circuits is:
the first port 11 is connected to a negative terminal of the fourth LED lamp D4, a positive terminal of the fifth LED lamp D4, and a positive terminal of the sixth LED lamp D4, respectively.
The negative terminal of the sixth LED lamp D4 is connected to the ground GND through a series first resistor R1.
The second port 12 is connected to the positive terminal of the fourth LED lamp D4 and the negative terminal of the fifth LED lamp D4, respectively.
Referring to fig. 6, the circuit structure 104 of the four LED lamp mode circuits is:
the first port 11 is connected to a negative terminal of the seventh LED lamp D4, a positive terminal of the eighth LED lamp D4, and a positive terminal of the tenth LED lamp D4, respectively.
The negative terminal of the tenth LED lamp D4 is connected to ground GND through a series third resistor R3.
The second port 12 is connected to a positive terminal of the seventh LED lamp D4, a negative terminal of the eighth LED lamp D4, and a positive terminal of the ninth LED lamp D4, respectively.
The negative terminal of the ninth LED lamp D4 is connected to the ground GND through a series second resistor R2.
Referring to fig. 7, the circuit structure 105 of the X-mode circuit is:
the second port 12 is connected to ground GND.
The driving circuit module 2 includes a plurality of driving circuit units 21. The driving circuit unit 21 generates a driving signal and outputs the driving signal to the LED power display module 1. The driving signal is used for controlling the LED electric quantity display module 1 to display the LED electric quantity.
Specifically, each of the driving circuit units 21 corresponds to one of the circuit types.
The detection module 3 is electrically connected to the first port 11 and the second port 12 of the LED power display module 1, and detects the first port 11 and the second port 12 to detect a first voltage value VLED1 corresponding to the first port 11 and a second voltage value VLED2 corresponding to the second port 12, and determines the circuit type of the LED power display module 1 according to the first voltage value VLED1 and the second voltage value VLED2 and according to a preset rule, and generates a detection result corresponding to the circuit type.
Wherein the content of the first and second substances,
the detection results correspond one-to-one to the drive circuit units 21. That is, the driving circuit module 2 is pre-stored with a plurality of driving circuit units 21 respectively corresponding to different detection results.
The first voltage value VLED1 is a voltage value of the first port 11, and the second voltage value VLED2 is a voltage value of the second port 12.
In this embodiment, the detection module 3 compares VLED1 with a first reference voltage V1 to generate a first digital signal VO1, compares VLED1 with a second reference voltage V2 to generate a second digital signal VO2, compares VLED2 with a first reference voltage V1 to generate a third digital signal VO3, compares VLED2 with a second reference voltage V2 to generate a fourth digital signal VO4, compares VLED1 with VLED2-VOs to generate a fifth digital signal VO5, and processes the generated first digital signal VO1, second digital signal VO2, third digital signal VO3, fourth digital signal VO4, and fifth digital signal VO5 according to a preset comparison table to determine the circuit type.
Wherein the content of the first and second substances,
VLED1 is the first voltage value.
VLED2 is the second voltage value.
VOS is the voltage deviation value of the same type of LED lamp.
V1 is a voltage value of the first reference voltage, and satisfies GND < V1< VDIO.
V2 is a voltage value of the second reference voltage, and satisfies VDIO < V2< VCC.
The preset rule is as follows:
when VLED1 is GND and VLED2 is VDIO, the circuit type is determined to be the LED lamp mode circuit.
When VLED1 is VCC and VLED2 is VDIO, the circuit type is determined to be the two LED lamp mode circuit.
When VLED1 is VDIO and VLED2 is VCC, the circuit type is determined to be the three LED lamp mode circuit.
When VLED1 is VDIO, VLED2 is2 VDIO, and VLED1< VLED2-VOS are simultaneously satisfied, the circuit type is determined as the three LED lamp mode circuit.
When the VLED1 is VDIO, the VLED2 is VDIO, and the VLED1 is larger than or equal to VLED2-VOS, the circuit type is determined as the four-LED lamp mode circuit.
When VLED2 is at GND, the circuit type is determined to be the X-mode circuit.
Wherein the content of the first and second substances,
the first port 11 and the second port 12 are both respectively pulled up through internal current sources to pull up the first voltage value VLED1 and the second voltage value VLED2 to the supply voltage VCC when the pins are floating.
GND is the ground voltage of the first port 11 and the ground voltage of the second port 12.
VDIO is a voltage value of the LED lamp when the first port 11 or the second port 12 is grounded through the LED lamp.
VCC is the supply voltage.
The relationship of the preset rule is shown in table 1:
TABLE 1 relationship table of Preset rules
In this embodiment, when the deviation of VOS is smaller than VDIO/3, VOS may be selected to be VDIO/2.
The operation of the detection module 3 is described below by a specific circuit configuration of a specific embodiment.
The detection module 3 comprises a first current source IS1, a second current source IS2, a first voltage source VR1, a second voltage source VR2, a third voltage source VR3, a fourth voltage source VR4, a fifth voltage source VR5, a first comparator COM1, a second comparator COM2, a third comparator COM3, a fourth comparator COM4, a fifth comparator COM5 and a judgment circuit unit 31.
An input end of the first current source IS1 IS connected to a power supply voltage, and an output end of the first current source IS1 IS connected to the positive input end of the first comparator COM1, the positive input end of the second comparator COM2, and the first port 11, respectively.
The negative input terminal of the first comparator COM1 is connected to the positive terminal of the first voltage source VR1, and the output terminal of the first comparator COM1 is connected to the first input terminal of the judgment circuit unit 31.
The negative input terminal of the second comparator COM2 is connected to the positive terminal of the second voltage source VR2, and the output terminal of the second comparator COM2 is connected to the second input terminal of the judgment circuit unit 31.
The negative terminals of the first voltage source VR1, the second voltage source VR2, the third voltage source VR3, and the fourth voltage source VR4 are all connected to ground.
An input end of the second current source IS2 IS connected to a power supply voltage, and an output end of the second current source IS2 IS connected to a positive input end of the third comparator COM3, a positive input end of the fourth comparator COM4, a positive end of the fifth voltage source VR5, and the second port 12, respectively.
The negative input terminal of the third comparator COM3 is connected to the positive terminal of the third voltage source VR3, and the output terminal of the third comparator COM3 is connected to the third input terminal of the judgment circuit unit 31.
A negative input terminal of the fourth comparator COM4 is connected to the positive terminal of the fourth voltage source VR4, and an output terminal of the fourth comparator COM4 is connected to a fourth input terminal of the judgment circuit unit 31.
A positive input terminal of the fifth comparator COM5 is connected to the negative terminal of the fifth voltage source VR5, a negative input terminal of the fifth comparator COM5 is connected to the first port 11, and an output terminal of the fifth comparator COM5 is connected to the fourth input terminal of the judgment circuit unit 31. Wherein, the voltage value of the output of the fifth voltage source VR5 is VOS.
The first output terminal Y1 of the judgment circuit unit 31, the second output terminal Y2 of the judgment circuit unit 31, the third output terminal Y3 of the judgment circuit unit 31, the fourth output terminal Y4 of the judgment circuit unit 31 and the fifth output terminal Y5 of the judgment circuit unit 31 are all connected to the drive control module 4.
In this embodiment, when the first output terminal Y1 outputs a valid signal, the circuit type is determined as the one LED lamp mode circuit. When the second output end Y2 outputs a valid signal, the circuit type is judged to be the two LED lamp mode circuit. When the third output end Y3 outputs a valid signal, the circuit type is determined as the three LED lamp mode circuit. When the fourth output end Y4 outputs a valid signal, the circuit type is determined as the four LED lamp mode circuit. When the fifth output terminal Y5 outputs a valid signal, the circuit type is determined to be the X-mode circuit.
Wherein the judgment circuit unit 31 includes the look-up table. The judgment circuit unit 31 is a digital circuit.
The driving control module 4 is connected to the driving circuit module 2 and the detection module 3, the driving control module 4 is configured to disconnect the driving circuit module 2 from the LED electric quantity display module 1 when the LED display driving system 100 is powered on, and the driving control module 4 is further configured to receive the detection result, select the driving circuit unit 21 corresponding to the detection result according to the detection result, and electrically connect the selected driving circuit unit 21 to the first port 11 and the second port 12, respectively. Thereby the operation of drive control module 4 realizes can the outside different LED lamp of automatic identification and connects the method to select for use drive circuit for use automatically and make product usage wide and user experience good.
It should be noted that the LED power display module 1, the driving circuit module 2, the detection module 3, and the driving control module 4 used in the LED display driving system 100 are all circuits, modules, chips, and components commonly used in the art, and a designer may select the circuits, modules, chips, and components according to actual performance and requirements of a product, which is not described in detail herein.
Compared with the prior art, when the LED display driving system is started by electrifying the system, the driving control module disconnects the driving circuit module from the LED electric quantity display module; then, the detection module is respectively and electrically connected with a first port and a second port of the LED electric quantity display module, the first port and the second port are detected simultaneously to measure a first voltage value corresponding to the first port and a second voltage value corresponding to the second port, the circuit type of the LED electric quantity display module is judged according to the first voltage value and the second voltage value and a preset rule, and a detection result corresponding to the circuit type is generated according to the circuit type; receiving the detection result by using the drive control module, selecting a drive circuit unit corresponding to the detection result according to the detection result, and electrically connecting the selected drive circuit unit with the first port and the second port respectively; and generating a driving signal by using the selected driving circuit unit, and outputting the driving signal to the LED electric quantity display module. The utility model discloses LED shows actuating system is through detecting first port with the second port, through examining out first magnitude of voltage with the second magnitude of voltage is judged LED power display module's circuit type selects the drive circuit unit that corresponds with it according to the testing result again to but the realization automatic identification outside different LED lamp connects the method, thereby chooses for use drive circuit for use automatically and makes product usage wide and user experience good.
The above embodiments of the present invention are only described, and it should be noted that, for those skilled in the art, modifications can be made without departing from the inventive concept, but these all fall into the protection scope of the present invention.
Claims (7)
1. An LED display driving system, comprising:
the LED electric quantity display module comprises a first port and a second port and is used for displaying LED electric quantity;
the detection module is respectively electrically connected with a first port and a second port of the LED electric quantity display module, detects the first port and the second port to detect a first voltage value corresponding to the first port and a second voltage value corresponding to the second port, judges the circuit type of the LED electric quantity display module according to the first voltage value and the second voltage value and preset rules, and generates a detection result corresponding to the circuit type;
the driving circuit module is prestored with a plurality of driving circuit units respectively corresponding to different detection results, generates a driving signal and outputs the driving signal to the LED electric quantity display module, and the driving signal is used for controlling the LED electric quantity display module to display LED electric quantity;
the driving control module is used for disconnecting the driving circuit module from the LED electric quantity display module when the LED display driving system is powered on and started, and is also used for receiving the detection result, selecting the driving circuit unit corresponding to the detection result according to the detection result, and then electrically connecting the selected driving circuit unit with the first port and the second port respectively.
2. The LED display driving system of claim 1, wherein the detection module compares the first voltage value with a first reference voltage to generate a first digital signal, compares the first voltage value with a second reference voltage to generate a second digital signal, compares the second voltage value with the first reference voltage to generate a third digital signal, compares the second voltage value with the second reference voltage to generate a fourth digital signal, compares the first voltage value with VLED2-VOS to generate a fifth digital signal, and compares the generated first digital signal, second digital signal, third digital signal, fourth digital signal and fifth digital signal with a preset reference table to determine the circuit type;
wherein the content of the first and second substances,
VLED2 is the second voltage value, VOS is the voltage deviation value of the same type of LED lamp;
v1 is a voltage value of the first reference voltage, and satisfies GND < V1< VDIO;
v2 is a voltage value of the second reference voltage, and satisfies VDIO < V2< VCC.
3. The LED display driving system according to claim 2, wherein the circuit types include one LED lamp mode circuit, two LED lamp mode circuits, three LED lamp mode circuits, four LED lamp mode circuits, and an X mode circuit;
the preset rule is as follows:
when the VLED1 is GND and the VLED2 is VDIO, the circuit type is determined as the one LED lamp mode circuit;
when the VLED1 is VCC and the VLED2 is VDIO, the circuit type is determined to be the two LED lamp mode circuit;
when VLED1 is VDIO and VLED2 is VCC, the circuit type is determined to be the three LED lamp mode circuit;
when the VLED1 is VDIO, the VLED2 is2 VDIO, and the VLED1< VLED2-VOS are simultaneously satisfied, the circuit type is determined as the three LED lamp mode circuit;
when the VLED1 is VDIO, the VLED2 is VDIO, and VLED1 is larger than or equal to VLED2-VOS, the circuit type is judged to be the four-LED lamp mode circuit;
when the VLED2 is GND, the circuit type is determined to be the X-mode circuit;
the first port and the second port respectively pull up pins through an internal current source so that the first voltage value and the second voltage value are pulled up to a power supply voltage when the pins float;
VLED1 is the first voltage value, GND is the ground voltage of the first port and the ground voltage of the second port, VDIO is the voltage value of the LED lamp when the first port or the second port is grounded through the LED lamp, and VCC is the supply voltage.
4. The LED display driving system according to claim 3, wherein the detection module comprises a first current source, a second current source, a first voltage source, a second voltage source, a third voltage source, a fourth voltage source, a fifth voltage source, a first comparator, a second comparator, a third comparator, a fourth comparator, a fifth comparator and a judgment circuit unit;
an input end of the first current source is connected to a power supply voltage, and an output end of the first current source is respectively connected to a positive input end of the first comparator, a positive input end of the second comparator and the first port;
the negative input end of the first comparator is connected to the positive end of the first voltage source, and the output end of the first comparator is connected to the first input end of the judgment circuit unit;
the negative input end of the second comparator is connected to the positive end of the second voltage source, and the output end of the second comparator is connected to the second input end of the judgment circuit unit;
the negative electrode end of the first voltage source, the negative electrode end of the second voltage source, the negative electrode end of the third voltage source and the negative electrode end of the fourth voltage source are all connected to the ground;
an input end of the second current source is connected to a power supply voltage, and an output end of the second current source is respectively connected to a positive input end of the third comparator, a positive input end of the fourth comparator, a positive end of the fifth voltage source, and the second port;
the negative input end of the third comparator is connected to the positive end of the third voltage source, and the output end of the third comparator is connected to the third input end of the judgment circuit unit;
the negative input end of the fourth comparator is connected to the positive end of the fourth voltage source, and the output end of the fourth comparator is connected to the fourth input end of the judgment circuit unit;
a positive input end of the fifth comparator is connected to a negative end of the fifth voltage source, a negative input end of the fifth comparator is connected to the first port, and an output end of the fifth comparator is connected to a fourth input end of the judgment circuit unit;
the first output end of the judgment circuit unit, the second output end of the judgment circuit unit, the third output end of the judgment circuit unit, the fourth output end of the judgment circuit unit and the fifth output end of the judgment circuit unit are all connected to the drive control module;
wherein the judging circuit unit comprises the comparison table.
5. The LED display driving system according to claim 4, wherein the determination circuit unit is a digital circuit.
6. The LED display driving system according to claim 4, wherein the voltage value of the output of the fifth voltage source is VOS.
7. The LED display driving system according to claim 4,
when the first output end outputs an effective signal, the circuit type is judged to be the LED lamp mode circuit;
when the second output end outputs an effective signal, the circuit type is judged to be the two LED lamp mode circuits;
when the third output end outputs an effective signal, the circuit type is judged to be the three LED lamp mode circuits;
when the fourth output end outputs an effective signal, the circuit type is judged to be the four LED lamp mode circuits;
when the fifth output end outputs an effective signal, the circuit type is judged as the X-mode circuit.
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| CN202020468927.9U CN212163775U (en) | 2020-04-02 | 2020-04-02 | LED display driving system |
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| CN202020468927.9U CN212163775U (en) | 2020-04-02 | 2020-04-02 | LED display driving system |
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