TWI423721B - Driving device for led module - Google Patents

Description

Light-emitting diode module driving device

The invention relates to a light-emitting diode module driving device, and particularly relates to a light-emitting diode module driving device with a fault detecting pin and a fault notification function.

In today's multi-functional electronic devices, it is necessary to integrate multiple functional circuits into the same integrated circuit or system. In order to provide different power supplies for the same integrated circuit or different functional circuits of the system, the design of a so-called DC DC power converter is also proposed. Common DC-DC power converters include a booster DC-DC power converter or a buck DC-DC power converter.

As an example of a driving device for driving a backlight module constructed by a light-emitting diode, the backlight module of the present type drives a plurality of light-emitting diode strings, and each string of light-emitting diodes includes a plurality of light-emitting diodes connected in series. Polar body. As shown in FIG. 1 , FIG. 1 is a driving circuit diagram of a conventional LED module 10 . The light emitting diode module 10 includes a light emitting diode string 110 and a driving device 120 thereof, and the light emitting diode string 110 includes a plurality of light emitting diode LEDs. The voltage conversion unit 130 in the driving device 120 is a DC/DC voltage converter in the present embodiment, which receives the input voltage Vin, and generates a driving voltage V _DR according to the switching signal Ssw of the switching signal driving unit 140, thereby driving the light emitting diode 2 Polar body string 110.

The driving device 120 of the conventional LED module 10 usually has a fault detection pin P _Fault , so as to automatically stop driving the light when detecting a partial LED LED failure in the LED string 110. The diode string 110 prevents the circuit in the LED string 110 or the driving device 120 from being burnt due to overheating of the driving device 120 or due to continuous power supply of the voltage converting unit 120. In other words, the comparison voltage V _CR on the fault detection pin P _Fault is obtained by dividing the driving voltage V _DR via the LED string 110, the resistor R1 and the resistor R2. When the LEDs in the LED string 110 can operate normally and are not damaged, the driving voltage V _DR should be mostly consumed in the LEDs, so the voltage value of the voltage V _CP is compared. Less than the threshold voltage of the switch 150, the switch 150 is in an on state. Thereby, the PWM pin of the switching signal driving unit 140 can receive the pulse width modulation signal PWM_signal via the switch 150, so that the switching signal S _SW becomes the pulse width modulation signal PWM_signal, and the voltage conversion unit 130 can be pulsed The wave width modulation signal PWM_signal continuously drives the LED string 110.

In contrast, when the partial LED is damaged or the voltage value of the driving voltage V _DR is too high, the voltage value of the comparison voltage V _CP will be higher than the threshold voltage of the switch 150, and the switch 150 is turned on. The state transitions to an off state. Thereby, the PWM pin of the switching signal driving unit 140 receives the ground voltage V _SS via the resistor R3, and the switching signal S _SW becomes a DC voltage signal (for example, the switching signal S _SW becomes a logic low level signal), and the voltage converting unit 130 Therefore, the LED string 110 cannot be continuously driven, so that the driving circuit 120 has the function of detecting the LED malfunction of the LED and circuit protection.

However, the cause of the failure of the LED module 10 is not only the damage of the LED of the photodiode, but also the failure of the circuit of the driving device 120 may cause the LED module 10 to malfunction. Therefore, when the repairer checks the fault of the LED module 10, it is necessary to check the circuits of the LED string 110 and the driving device 120 one by one, and cannot be debugged by the LED module 10. Feet to understand its damage.

The invention provides a light emitting diode module driving device. The LED device driving device has a fault detecting pin. The fault detecting pin can detect whether the light emitting diode module is based on the comparison voltage. Fault, and the function of fault notification when the LED module fails.

In another aspect, the present invention provides a light emitting diode module that integrates fault detection pins of a plurality of LED driving devices into a multiple fault detecting pin. When the LED is damaged, the LED module can immediately notify the fault.

The invention provides a light emitting diode module driving device. The LED device driving device comprises a voltage converting unit, a light emitting diode module voltage detecting unit and a switching signal generating unit. The voltage conversion unit is coupled to the LED module, and can receive the switching signal, and generate a driving voltage according to the switching signal to drive the LED module. The light-emitting diode module voltage detecting unit is also coupled to the light-emitting diode module, and the light-emitting diode The body module voltage detecting unit can detect the driving voltage on the LED module and divide the driving voltage to generate a comparison voltage. The switching signal generating unit is coupled to the voltage converting unit and the LED module voltage detecting unit. The switching signal generating unit has a fault detecting pin to receive the comparison voltage, and the switching signal generating unit can compare the voltage value of the reference voltage and the comparison voltage to disable or enable the switching signal. When the switching signal is disabled, the switching signal generating unit can further raise the voltage level on the fault detecting pin to the logic high level voltage, thereby generating a fault notification signal.

In an embodiment of the invention, the switching signal is a pulse width modulation signal when enabled, and is a DC voltage signal when the switching signal is disabled.

In an embodiment of the invention, the switching signal generating unit includes a switching signal control unit and a switching signal driving unit. The switching signal control unit is coupled to the fault detecting pin to receive the comparison voltage, and the switching signal control unit generates the control signal by comparing the reference voltage and the comparison voltage. The switching signal driving unit is coupled to the switching signal control unit, and the switching signal driving unit can enable or disable the switching signal according to the control signal described above. When the switching signal is disabled, the switching signal control unit can further raise the voltage level on the fault detecting pin to the logic high level voltage, thereby generating a fault notification signal.

From another point of view, the present invention provides a light emitting diode module including a plurality of light emitting diode strings, a plurality of light emitting diode driving devices, and a plurality of diodes, and Each of the LED driving devices is coupled to and drives one LED string. Every light dipole The body driving device includes a voltage converting unit, a light emitting diode module voltage detecting unit, and a switching signal generating unit. The voltage conversion unit is coupled to the corresponding LED string, and the voltage conversion unit receives and generates a driving voltage according to the switching signal, thereby driving the corresponding LED string. The light-emitting diode module voltage detecting unit is coupled to the corresponding light-emitting diode string, and the light-emitting diode module voltage detecting unit can detect the driving voltage on the light-emitting diode module, and can be driven according to the driving voltage The partial voltage produces a comparison voltage. The switching signal generating unit is coupled to the voltage converting unit and the LED module voltage detecting unit. The switching signal generating unit has a fault detecting pin to receive the comparison voltage, and the switching signal generating unit compares the reference voltage and the voltage value of the comparison voltage to disable or enable the switching signal. After the switching signal is disabled, the switching signal generating unit further raises the voltage level on the fault detecting pin to a logic high level voltage, thereby generating a fault notification signal. One end of each diode is coupled to a corresponding fault detection pin, and the other ends of the diodes are coupled to multiple fault detection pins, and the multiple fault detection pins can generate multiple fault detection signals. .

Based on the above, an embodiment of the present invention provides a light emitting diode module driving device, wherein the LED device driving device has a fault detecting pin, which compares a voltage level of a reference voltage and a comparison voltage, thereby detecting Detect if the LED module is faulty. When the LED module is faulty, the voltage level of the fault detection pin is raised to a logic high level voltage, thereby generating a fault notification signal to function as a fault notification.

In addition, another suitable LED module has a plurality of LED driving devices, and each LED driving device has a failure notification. Fault detection pin. The LED module integrates the fault detection pins of the plurality of LED driving devices into a single fault detecting leg, so that when some of the LEDs are damaged, the LED module can be Immediately notify the fault.

The above described features and advantages of the present invention will be more apparent from the following description.

DETAILED DESCRIPTION OF THE INVENTION Reference will now be made in detail to the exemplary embodiments embodiments In addition, wherever possible, the elements and/

Please refer to FIG. 2. FIG. 2 is a block diagram of a light-emitting diode module driving device 20 according to a first embodiment of the present invention. As shown in FIG. 2, the LED module driving device 20 is configured to drive the LED module 110, and the LED module driving device 20 includes a voltage conversion unit 130 and a LED module for voltage detection. The measuring unit 230 and the switching signal generating unit 240.

Referring to FIG. 2, the voltage conversion unit 130 is a DC DC power converter in this embodiment, and the voltage conversion unit 130 receives the input voltage Vin and according to the switching signal S _{SW of the} switching signal generation unit 240. A driving voltage V _{DR is} generated to drive the LED string 110. In the embodiment, when the switching signal S _SW is a pulse width modulation signal, the voltage conversion unit 130 generates the driving voltage V _DR to drive the LED string 110. In contrast, when the switching signal S _SW is a DC voltage signal (for example, when the switching signal S _SW is a logic low level signal), the voltage conversion unit 130 stops the operation of performing voltage conversion. Please note that those skilled in the art can change the type of the voltage conversion unit 130 according to their design requirements, and thus the present invention should not be limited thereto.

The LED module voltage detecting unit 230 is also coupled to the LED string 110. The LED module voltage detecting unit 230 detects the driving voltage V _DR on the LED module 110 and generates a comparison voltage V _CP according to the driving voltage V _DR . The switching signal generating unit 240 is coupled to the voltage converting unit 130 and the LED module voltage detecting unit 130. The switching signal generating unit 240 has a fault detecting pin P _Fault to receive the comparison voltage V _CP , and the switching signal generating unit 240 can compare the magnitudes of the voltage values of the reference voltage V _REF and the comparison voltage V _CP to disable or enable the switching signal. S _SW . In this embodiment, the switching signal S _SW is a Pulse Width Modulation (PWM) signal when enabled, and the switching signal S _SW is a DC voltage signal when disabled (eg, the switching signal S _SW is Logic low level signal). Then, if the switching signal S _{SW is} disabled, the switching signal generating unit 240 can further raise the voltage level on the fault detecting pin P _Fault to a logic high level voltage to generate a fault notification signal.

The functional architecture of the LED module voltage detecting unit 230 and the switching signal generating unit 240 is described. FIG. 3 is a schematic diagram of the LED module driving device 20 according to the first embodiment of the present invention. Detailed block diagram. In this embodiment, the LED module voltage detecting unit 230 includes a voltage dividing circuit formed by connecting the resistor R1 and the resistor R2 in series, and divides according to the driving voltage V _DR to generate a comparison voltage V _CP . Specifically, the LED module voltage detecting unit 230 detects the driving voltage V _DR on the LED string 110 (wherein the driving voltage V _DR is equal to the input voltage Vin minus the LED module voltage) The voltage received by the detecting unit 230 is divided and the voltage received by the LED module voltage detecting unit 230 is divided to generate a comparison voltage V _CP .

In addition, in the present embodiment, the switching signal generating unit 240 includes a switching signal control unit 310 and a switching signal driving unit 320. The switching signal control unit 310 is coupled to the fault detection pin P _{Fault to} receive the comparison voltage V _CP , and the switching signal control unit 310 generates the control signal S _CTL by comparing the reference voltage V _REF and the comparison voltage V _CP . The switching signal driving unit 320 is coupled to the switching signal control unit 310, and the switching signal driving unit 320 can enable or disable the switching signal S _SW according to the control signal S _CTL .

In order to make the present invention more familiar to those skilled in the art, the circuit architecture and the actuation flow of the LED module driving device 20 will be described in detail below. Please refer to FIG. 4, which is the first according to the present invention. The circuit architecture of the LED module driving device 20 of the embodiment. As shown in FIG. 4, the switching signal control unit 310 includes a comparison unit 330 and an active pull-up circuit 340. In the present embodiment, the hysteresis comparator 335 is used herein as a suitable example of the comparing unit 330, but the invention should not be limited thereto. The first input of the comparison unit 330 (eg, the inverting input of the hysteresis comparator 335) receives the reference voltage V _REF , and the second input of the comparison unit 330 (eg, the non-inverting input of the hysteresis comparator 335 ) is coupled The fault detection pin P _Fault is received to receive the comparison voltage V _CP , and the comparison unit 330 can compare the voltage level of the reference voltage V _REF and the comparison voltage V _CP , so that the output signal of the comparison unit 330 generates the control signal S _{CTL .} .

With continued reference to FIG. 4, the active pull-up circuit 340 includes a switch 350 and a logic operation unit 360 in this embodiment. The switch 350 is exemplified herein by a PMOS transistor MP1. The first end of the switch 350 (eg, the source terminal of the transistor MP1) is coupled to the logic high level voltage Vdd, and the second end of the switch 350 (eg, the transistor MP1)汲 Extreme) is coupled to the fault detection pin P _Fault . In the present embodiment, the logic operation unit 360 takes an inverse gate (NAND gate) 370 as an example, and the first input end of the logic operation unit 360 (for example, an input terminal of the inverse gate 370) receives the control signal S _CTL , and the logic operation The second input of the unit 360 (eg, the other input of the gate 370) can receive the reset signal S _RST , and the output of the logic unit 360 (eg, the output of the gate 370 ) is coupled to the switch The control terminal of 350 (eg, the gate terminal of transistor MP1). Moreover, the reset signal S _RST is a signal for the light-emitting diode module driving device 20 to resume operation after the maintenance personnel has replaced the damaged LED string 110.

Here, the reset signal S _RST , the voltage level on the fault detection pin P _Fault , and the actuation mode of the active pull-up circuit 340 will be described. Please refer to FIG. 4 and FIG. 5 simultaneously. FIG. 5 is a diagram according to the present invention. A signal waveform diagram of an embodiment. As shown in FIG. 5, during the period T1, that is, when the LED module driving device 20 is normally operated, the driving voltage V _{DR is} mostly consumed in the LED string 110, and the voltage of the comparison voltage V _CP at this time is The value is less than the reference voltage V _REF . Thereby, when the voltage value of the comparison voltage V _CP is less than the reference voltage V _REF , the control signal S _CTL generated by the switching signal control unit 310 is an enable signal (eg, the control signal S _CTL at this time is a logic low level signal) 320 put switching signal driving unit enabling the switching signal S _SW, i.e., the switching signal driving unit 320 so that the switching signal S _SW pulse width modulation carrier signal. At this time, the switch 350 is turned off, and the reset signal S _RST is in a disabled state (the disable signal of the reset signal S _RST in this embodiment is a logic high level state).

In contrast, when some of the LEDs in the LED string 110 are damaged and are broken down or other factors cause the voltage received by the LED module voltage detecting unit 230 to be too high, The voltage of the comparison voltage V _CP should be greater than the reference voltage V _REF . Therefore, when the comparison unit 330 of the switching signal control unit 310 detects that the voltage level on the fault detection pin P _Fault is greater than the reference voltage V _REF , the period T2 is entered. Switching signal control unit 310 generates control signal S _CTL enable signal at this time is converted to a disable signal (e.g., in this case the control signal S _CTL from the logic low level signal is converted to a logic high level signal), the switching signal The driving unit 320 disables the switching signal S _SW according to this, and even if the switching signal S _SW generated by the switching signal driving unit 320 is a DC voltage signal (for example, the switching signal S _SW is a logic low level signal). And, when the switching signal S _{SW is} disabled, the transistor MN1 stops conducting and the voltage conversion unit 130 stops the power conversion. After that, the switch 350 in the switching signal control unit 310 will be turned on according to the logic operation result (logic low level signal) of the logic operation unit 360 according to the output of the comparison unit 330 (logic high level signal), thereby The voltage level on the fault detection pin P _Fault is pulled up to the logic high level voltage Vdd, which in turn generates a fault notification signal. The designer can use this fault notification signal to notify the maintenance personnel or other responsible personnel to know that some of the LEDs in the LED string 110 have been damaged, or that the LEDs are illuminated due to other factors. The group drive unit 20 fails.

If the maintenance personnel has replaced the damaged LED string 110 or has eliminated other factors and repaired the LED module driver 20, the reset signal S _RST can be disabled (logic) The high level signal) transitions to the enabled state (logic low level signal), thereby entering the period T3. Thereafter, the period T3 enters the period T1, at which time the reset signal S _RST also transitions back to the disable signal (logic high level signal), and the switching signal generating unit 240 can continue to compare the voltages of the reference voltage V _REF and the comparison voltage V _CP . The value of the value, in order to continue to disable or enable the switching signal S _SW . Other actuation modes and procedures have been described in the above embodiments, and therefore will not be described herein.

The following description provides a DC-DC voltage converter according to the present embodiment as a suitable example of the voltage conversion unit 130. Referring to FIG. 4, the DC/DC voltage converter 130 includes a diode D1, a capacitor C1, an inductor L1, a changeover switch 380, and a conversion resistor R4. The cathode of the diode D1 receives the input voltage Vin and is coupled to the first end of the LED string 110. The first end of the capacitor C1 receives the input voltage Vin, and the second end of the capacitor C1 is coupled to the second end of the LED string 110. The first end of the inductor L1 is coupled to the anode of the diode D1, and the second end of the inductor L1 is coupled to the second end of the capacitor C1. In the present embodiment, the NMOS transistor MN1 is taken as an example. The control terminal of the changeover switch 380 (for example, the gate terminal of the transistor MN1) receives the switching signal S _SW , and the first end of the switch 380 (for example, the transistor MN1) The second end of the changeover switch 380 (for example, the source terminal of the transistor MN1) is coupled to one end of the conversion resistor R4, and the conversion resistor R4 is coupled to the anode of the diode D1 and the first end of the inductor L1. The other end receives the ground voltage V _SS . Those skilled in the art will be able to infer the actuation mode of the DC/DC voltage converter 130, and therefore will not be described here.

In other embodiments consistent with the present invention, the LED module driving device may further include an overcurrent protection unit. Referring to FIG. 6, FIG. 6 is a LED module driving according to a second embodiment of the present invention. The circuit architecture of device 60. This embodiment is similar to the above embodiment, and therefore the same operation manner and description will not be repeated. The difference is that the switching signal generating unit 240 in the LED module driving device 60 of FIG. 6 further includes an overcurrent protection unit 610. In this embodiment, the first receiving end of the overcurrent protection unit 610 receives the overcurrent reference voltage V _CSREF , and the overcurrent comparison voltage V _CS received by the second receiving end of the overcurrent protection unit 610 is utilized by the input voltage Vin. The series circuit of the diode D1, the transistor MN1 and the conversion resistor R4 is divided by voltage. The overcurrent protection unit 610 can compare the _magnitudes of the voltage values of the overcurrent comparison voltage V _CS and the overcurrent reference voltage V _CSREF such that the switching signal generation unit 240 disables or enables the switching signal S _SW . In other words, when the overcurrent protection unit 610 detects that the voltage value of the overcurrent comparison voltage V _CS is greater than the voltage value of the overcurrent reference voltage V _CSREF , it indicates that the current flowing through the voltage conversion unit 130 is too large and there is a burnout. The switching signal generating unit 240 can disable the switching signal S _SW to cause the voltage converting unit 130 to stop the operation of voltage conversion. In the present embodiment, the overcurrent protection unit 610 uses the hysteresis comparator 615 as a suitable example, but the invention should not be limited thereto.

In another embodiment consistent with the present embodiment, the present invention further provides a light emitting diode module 70, please refer to FIG. 7, which is in accordance with the present invention. The circuit structure of the light-emitting diode module 70 of the third embodiment. As shown in FIG. 7, the LED module 70 includes LED strings 110_1~110_N, LED drivers 60_1~60_N, and diodes DF1~DFN. Each of the LED driving devices 60_1~60_N corresponds to one LED string 110_1~110_N, and N is a positive integer. In the embodiment, N is set to 3 to simplify the description. The circuit structure and the actuation mode of each of the LED driving devices 60_1 to 60_3 are the same as those of the LED module driving device 60 of the second embodiment of FIG. 6 and will not be described herein.

The difference between this embodiment and the above embodiment is that one end of each of the diodes DF1 _DF DF3 is coupled to the corresponding fault detection pin P _{FAULT_1} ~ P _{FAULT_3} , and the other end of the diode DF1 _DF DF3 The sensor is coupled to the multiple fault detection pin PM _FAULT , and the maintenance personnel can learn whether the LED string 110_1~110_3 is damaged or illuminated by the multiple fault detection signals generated by the multiple fault detection pin PM _FAULT . Whether the pole drive devices 60_1~60_3 are faulty. In other words, the LED module 70 can receive the fault notification signal generated by the fault notification pin P _{FAULT_1} ~ P _{FAULT_3} by using the multiple fault detection pin PM _FAULT , thereby generating multiple fault detection signals. In addition, other detailed procedures of the present embodiment are included in the above embodiments, and thus are not described herein.

In summary, the embodiment of the present invention provides a driving device for a light emitting diode module, wherein the driving device of the LED module has a fault detecting pin, which compares the voltage level of the reference voltage and the comparison voltage. In order to detect whether the LED module is faulty. And when the LED module fails, The voltage level of the fault detection pin is pulled up to a logic high level voltage, thereby generating a fault notification signal to function as a fault notification.

In addition, another suitable light-emitting diode module has a plurality of light-emitting diode driving devices, and each of the light-emitting diode driving devices is provided with a fault detecting pin that can notify whether the light-emitting diode is faulty. In addition, the LED module integrates the fault detection pins of the plurality of LED driving devices into a multiple fault detecting leg, so that when some of the LEDs are damaged, the LED module is damaged. The fault notification can be made immediately.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the invention, and any one of ordinary skill in the art can make some modifications and refinements without departing from the spirit and scope of the invention. The scope of the invention is defined by the scope of the appended claims.

10, 70‧‧‧Lighting diode module

20, 60, 60_1~60_3‧‧‧Lighting diode module driving device

110, 100_1~100_3‧‧‧Lighting diode strings

120‧‧‧Lighting diode drive

130‧‧‧Voltage conversion unit

140, 320‧‧‧Switching signal drive unit

150, 350, 380‧ ‧ switch

230‧‧‧Lighting diode module voltage detection unit

240‧‧‧Switching signal generation unit

310‧‧‧Switching signal control unit

330‧‧‧Comparative unit

335, 615‧‧‧ hysteresis comparator

340‧‧‧Active pull-up circuit

360‧‧‧Logical unit

370‧‧‧Anti-gate

610‧‧‧Overcurrent protection unit

LED‧‧‧Light Emitting Diode

C1‧‧‧ capacitor

D1, DF1~DF3‧‧‧ diode

L1‧‧‧Inductance

MP1‧‧‧ PMOS transistor

MN1‧‧‧NMOS transistor

S _RST ‧‧‧Reset signal

S _CTL ‧‧‧ control signal

S _SW ‧‧‧Switching signal

During the period of T1~T3‧‧

Vin‧‧‧Input voltage

V _CP ‧‧‧Comparative voltage

V _DD ‧‧‧Logic high level voltage

V _DR ‧‧‧ drive voltage

V _REF ‧‧‧reference voltage

V _SS ‧‧‧ Grounding voltage

P _Fault , P _{Fault_1} ~P _{Fault_3 ‧‧‧Fault} detection pin

PWM_signal‧‧‧ pulse width modulation signal

PM _Fault ‧‧‧Fault detection pin

R1~R4‧‧‧ resistor

1 is a circuit diagram of a conventional light emitting diode module.

2 is a block diagram of a driving device for a light emitting diode module according to a first embodiment of the present invention.

3 is a detailed block diagram of a driving device for a light emitting diode module according to a first embodiment of the present invention.

4 is a circuit diagram of a driving device of a light emitting diode module according to a first embodiment of the present invention.

Figure 5 is a signal waveform diagram in accordance with a first embodiment of the present invention.

6 is a circuit diagram of a driving device of a light emitting diode module according to a second embodiment of the present invention.

FIG. 7 is a circuit diagram of a light emitting diode module according to a third embodiment of the present invention.

20‧‧‧Lighting diode module driver

110‧‧‧Lighting diode strings

130‧‧‧Voltage conversion unit

230‧‧‧Lighting diode module voltage detection unit

240‧‧‧Switching signal generation unit

S _SW ‧‧‧Switching signal

Vin‧‧‧Input voltage

V _CP ‧‧‧Comparative voltage

V _DR ‧‧‧ drive voltage

V _REF ‧‧‧reference voltage

P _Fault ‧‧‧Fault detection pin

LED‧‧‧Light Emitting Diode

Claims (13)

The invention relates to a light-emitting diode module driving device, comprising: a voltage conversion unit coupled to the light-emitting diode module for receiving and generating a driving voltage according to a switching signal to drive the light-emitting diode module a light-emitting diode module voltage detecting unit coupled to the light-emitting diode module for detecting the driving voltage on the light-emitting diode module, and generating the driving voltage according to the voltage And a switching signal generating unit coupled to the voltage converting unit and the LED module voltage detecting unit, having a fault detecting pin to receive the comparison voltage, the switching signal generating unit comprising: a switching signal control unit coupled to the fault detecting pin to receive the comparison voltage, the switching signal control unit and comparing the comparison voltage and the reference voltage to generate a control signal; and a switching signal driving unit coupled to the a switching signal control unit configured to enable or disable the switching signal according to the control signal, and when the switching signal is disabled, the switching signal control unit is pulled higher Fault detection voltage level on the pin to the logic high level voltage, so as to generate a fault notification signal. The illuminating diode module driving device of claim 1, wherein the switching signal is a pulse width modulation signal when enabled, and is a DC voltage signal when the switching signal is disabled. The illuminating diode module driving device of claim 1, wherein the switching signal control unit comprises: a comparison unit, the first input end of the comparison unit receives the reference voltage, the second input end of the comparison unit is coupled to the fault detection pin to receive the comparison voltage, and the comparison unit is configured to compare the comparison voltage and the reference voltage to Generating the control signal; and an active pull-up circuit coupled to the comparison unit, and when the switch signal is disabled, the active pull-up circuit pulls the voltage level on the fault detection pin to the logic High level voltage. The illuminating diode module driving device of claim 3, wherein the active pull-up circuit comprises a switch, the first end of which is coupled to the logic high-level voltage, and the second end of the switch is coupled The fault detection pin is connected. When the switching signal is disabled, the switch is turned on to raise the voltage level on the fault detection pin to the logic high level voltage. The light-emitting diode module driving device of claim 4, wherein the active pull-up circuit further comprises a logic operation unit, wherein the first input end receives the control signal, and the second logic control unit The input end receives a reset signal, and the output end of the logic operation unit is coupled to the control end of the switch. When the reset signal is disabled and the switching signal is disabled, the switch is turned on, and when the reset signal is When enabled, the switch is turned off, whereby the switching signal generating unit compares the comparison voltage and the reference voltage to disable or enable the switching signal. The light-emitting diode module driving device of claim 5, wherein the switch is a PMOS transistor, the comparison unit is a hysteresis comparator, and the logic operation unit is a reverse gate. The illuminating diode module driving device of claim 1, wherein the voltage converting unit comprises: a diode, the cathode receiving an input voltage and coupled to the illuminating diode module The first end of the capacitor receives the input voltage, the second end of the capacitor is coupled to the second end of the LED module; and the first end of the inductor is coupled to the diode An anode, the second end of the inductor is coupled to the second end of the capacitor; and a switch, the control end receives the switching signal, the first end of the switch is coupled to the anode of the diode and the The first end of the conversion switch is coupled to one end of a conversion resistor, and the other end of the conversion resistor receives a ground voltage. The illuminating diode module driving device of claim 7, wherein the switching signal generating unit further comprises: an overcurrent protection unit, wherein the first receiving end of the overcurrent protection unit receives an overcurrent reference voltage The second receiving end of the overcurrent protection unit is coupled to one end of the conversion resistor to obtain an overcurrent comparison voltage through the driving voltage division, and the overcurrent protection unit compares the overcurrent comparison voltage and the overcurrent reference The voltage is such that the switching signal generating unit disables or enables the switching signal. The light-emitting diode module driving device of claim 1, wherein the light-emitting diode module is a light-emitting diode string, and the light-emitting diode string comprises at least one light-emitting diode. A light emitting diode module comprising: a plurality of light emitting diode strings; a plurality of LED driving devices, each of the LED driving devices correspondingly coupling and driving one of the LED strings, and each LED driving device comprises: a voltage conversion unit, coupled Connected to the corresponding LED string for receiving and generating a driving voltage according to a switching signal to drive the corresponding LED string; a LED module voltage detecting unit coupled to Corresponding to the LED string for detecting the driving voltage on the LED module, and according to dividing the driving voltage to generate a comparison voltage; and a switching signal generating unit coupled to the voltage The conversion unit and the LED module voltage detecting unit have a fault detecting pin to receive the comparison voltage, and the switching signal generating unit compares the comparison voltage and a reference voltage to disable or enable the switching a signal, and after the switching signal is disabled, the switching signal generating unit further raises the voltage level on the fault detecting pin to a logic high level voltage, thereby generating a fault notification signal And a plurality of diodes, one end of each of the diodes is coupled to a corresponding fault detection pin, and the other ends of the diodes are coupled to a multiple fault detection pin. The fault detection pin generates a multiple fault detection signal. The illuminating diode module of claim 10, wherein the switching signal is a pulse width modulation signal when enabled, and is a DC voltage signal when the switching signal is disabled. The illuminating diode module of claim 10, wherein the switching signal generating unit comprises: a switching signal control unit coupled to the fault detecting pin to receive the comparison voltage, the switching signal control unit and comparing the comparison voltage and the reference voltage to generate a control signal; and a switching signal driving unit coupled to the The switching signal control unit is configured to enable or disable the switching signal according to the control signal, and when the switching signal is disabled, the switching signal control unit further raises the voltage level on the fault detecting pin The logic high level voltage is generated to generate the fault notification signal. The illuminating diode module of claim 12, wherein the switching signal control unit comprises: a comparing unit, the first input end receives the reference voltage, and the second input end of the comparing unit is coupled to the a fault detecting pin to receive the comparison voltage, the comparing unit is configured to compare the comparison voltage and the reference voltage to generate the control signal; and an active pull-up circuit coupled to the comparing unit, and when the switching signal is disabled After being enabled, the active pull-up circuit pulls the voltage level on the fault detection pin to the logic high level voltage.