A high-power, high-speed stroboscopic LED light source

Abstract

The present invention relates to a high-power, high-speed stroboscopic LED light source, comprising a housing, a lens module detachably connected to the front end of the housing, an LED chip arranged in the housing corresponding to the lens module, and a stroboscopic drive circuit arranged in the housing and electrically connected to the LED chip; the stroboscopic drive circuit enables the LED chip to operate in a high-current, low-duty-cycle stroboscopic manner, effectively improving the instantaneous luminous brightness of the LED chip; the stroboscopic drive circuit effectively improves the voltage stability output by the stroboscopic drive circuit by providing a capacitor module composed of several capacitors with different capacitance values ​​connected in parallel, thereby improving the luminous stability of the LED chip and meeting the brightness requirements of high-speed photography with short exposure time.

Description

Technical field

[0002] The invention relates to the technical field of LED light sources, in particular to a high-power, high-speed, stroboscopic LED light source. [Background Technology]

[0004] As high-speed imaging technology evolves toward higher frequencies and shorter exposure times, it places higher demands on the performance of the corresponding light sources. With the advancement of LED chip technology, the luminous power of single-chip LED chips has continued to increase, making LED light sources a promising alternative to laser light sources. Compared to laser light sources, LED light sources offer advantages such as low cost, long service life, and stable luminous brightness. Low-duty-cycle stroboscopic operation can further enhance the instantaneous luminous power of single-chip LED chips, enabling them to operate safely at voltages several times higher than their rated voltage, further expanding the application of LED light sources in optical diagnostics. Currently, due to export regulations, the maximum frequency of imported high-speed cameras available in China is limited to 200,000 Hz, with a minimum exposure time of 1 μs. Achieving the shortest exposure time (1 μs) with high-speed cameras requires a higher light source brightness. LED chips operating under normal conditions cannot meet the brightness requirements for short exposure times. Therefore, this invention addresses this technological gap in China. [Summary of the invention]

[0006] To solve the above problems, the present invention provides a high-power, high-speed stroboscopic LED light source to meet the brightness requirements of high-speed photography with short exposure time.

[0007] To achieve the above objectives, the present invention provides the following technical solutions:

[0008] A high-power, high-speed, stroboscopic LED light source comprises a housing 1, a lens module 2 detachably connected to the front end of the housing 1, an LED chip 3 arranged in the housing 1 corresponding to the lens module 2, and a stroboscopic drive circuit arranged in the housing 1 and electrically connected to the LED chip 3.

[0009] As a preferred embodiment, it is further defined as: the strobe drive circuit includes a driver chip U1, a MOS tube M1 and a capacitor module, the input end of the driver chip U1 is connected to an external signal through a TTL signal input port 4, the output end of the driver chip U1 is connected to the negative electrode of the LED chip 3 through the MOS tube M1, the rear end of the shell 1 is provided with an LED power input port 5, one end of the capacitor module is divided into two paths, one path is electrically connected to the LED power input port 5, and the other path is connected to the positive electrode of the LED chip 3, and the other end of the capacitor module is grounded.

[0010] As a preferred embodiment, it is further defined as follows: the capacitor module is mainly composed of a plurality of capacitors with different capacitance values ​​connected in parallel.

[0011] As a preferred embodiment, it is further defined as follows: the capacitor module includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5, and the capacitors C1, C2, C3, C4 and C5 are connected in parallel.

[0012] As a preferred embodiment, it is further defined as follows: the driver chip U1 has eight pins, the first pin VDD and the eighth pin VDD of the driver chip U1 are connected to an external power supply, the second pin IN of the driver chip U1 is connected to the TTL signal input port 4, and the fourth pin AGND of the driver chip U1 is grounded; the fifth pin PGND of the driver chip U5 is divided into two paths, one path is connected to an external power supply through a parallel capacitor C6 and a capacitor C7, and the other path is grounded; the sixth pin OUT and the seventh pin OUT of the driver chip U5 are connected to the G pole of the MOS tube M1 through a resistor R1.

[0013] As a preferred embodiment, it is further defined as follows: the S pole of the MOS tube M1 is grounded, the D pole of the MOS tube M1 is connected to the cathode of the LED chip 3 through a power resistor; and both ends of the power resistor are externally connected to the connection port P1.

[0014] As a preferred embodiment, it is further defined as: the high-power, high-speed stroboscopic LED light source also includes a diode D1, the positive electrode of the diode D1 is connected to the node between the D pole of the MOS tube M1 and the power resistor, and the negative electrode of the diode D1 is connected to the positive pole of the LED chip 3.

[0015] As a preferred embodiment, it is further defined as follows: the driving chip U1 uses a gate driver.

[0016] As a preferred embodiment, it is further defined as: a switching switch 6 is also provided at the rear end of the shell 1, and the LED power input port 5 is directly electrically connected to the positive pole of the LED chip 3 through the switching switch 6 or is electrically connected to the capacitor module through the switching switch 6.

[0017] As a preferred embodiment, it is further defined as follows: a heat sink 7 is further provided in the housing 1 , the LED chip 3 is mounted on one side of the heat sink 7 , and a cooling fan 8 is mounted on the other side of the heat sink 7 .

[0018] The beneficial effects of the present invention are:

[0019] 1. The present invention uses a stroboscopic drive circuit to enable the LED chip to operate in a high-current, low-duty-cycle stroboscopic manner, effectively increasing the instantaneous brightness of the LED chip. The stroboscopic drive circuit effectively improves the voltage stability of the stroboscopic drive circuit output by providing a capacitor module composed of several capacitors of different capacitance values ​​connected in parallel, thereby improving the luminous stability of the LED chip and meeting the brightness requirements of high-speed photography with short exposure times.

[0020] 2. A heat sink and a cooling fan are also provided inside the shell to facilitate heat dissipation and effectively increase the service life of the product. In addition, the LED chip is assembled on the heat sink in the form of a module, which is conducive to changing the color of the light source.

[0021] 3. A switching switch is also provided at the rear end of the shell. The LED power input port is directly electrically connected to the positive pole of the LED chip through the switching switch or electrically connected to the capacitor module through the switching switch, so as to realize switching between constant light and strobe to meet user needs.

Brief Description of the Drawings

[0023] Figure 1 This is one of the structural diagrams created by the present invention;

[0024] Figure 2 This is the second structural diagram of the present invention;

[0025] Figure 3 It is a schematic diagram of the structural decomposition of the present invention;

[0026] Figure 4 It is a circuit principle diagram created by the present invention. [Specific implementation method]

[0028] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0029] As attached Figure 1 To the attached Figure 4As shown, a high-power, high-speed stroboscopic LED light source comprises a housing 1, a lens module 2 detachably connected to the front end of the housing 1, an LED chip 3 arranged in the housing 1 corresponding to the lens module 2, and a stroboscopic driving circuit arranged in the housing 1 and electrically connected to the LED chip 3. Specifically, the stroboscopic driving circuit comprises a driver chip U1, a MOS tube M1, and a capacitor module. The input end of the driver chip U1 is connected to an external signal through a TTL signal input port 4, and the output end of the driver chip U1 is connected to the negative electrode of the LED chip 3 through the MOS tube M1. The rear end of the housing 1 is provided with an LED power input port 5. One end of the capacitor module is divided into two paths, one path is electrically connected to the LED power input port 5, and the other path is connected to the positive electrode of the LED chip 3. The other end of the capacitor module is grounded. The strobe drive circuit enables the LED core to operate in a low-duty-cycle strobe mode. By configuring a capacitor module composed of several capacitors of different values ​​connected in parallel, the strobe drive circuit effectively improves the voltage stability of the strobe drive circuit output, thereby enhancing the luminous stability of the LED chip and meeting the brightness requirements of high-speed photography with short exposure times.

[0030] In this embodiment, the capacitor module includes capacitors C1, C2, C3, C4, and C5, which are connected in parallel, and have a simple structure. The capacitance value of capacitor C1 is between 0.1 and 100 uF, the capacitance value of capacitors C2, C3, and C4 is between 100 and 500 uF, and the capacitance value of capacitor C5 is between 500 and 1500 uF. The driver chip U1 has eight pins. The first pin VDD and the eighth pin VDD of the driver chip U1 are connected to an external power supply. The second pin IN of the driver chip U1 is connected to the TTL signal input port 4. The fourth pin AGND of the driver chip U1 is grounded. The fifth pin PGND of the driver chip U5 is divided into two paths, one of which is connected to an external power supply through the parallel capacitors C6 and C7, and the other is grounded. The sixth pin OUT and the seventh pin OUT of the driver chip U5 are connected to the G pole of the MOS tube M1 through the resistor R1. Driver chip U1 uses a gate driver, which offers high response speed and high frequency. A TTL square wave input signal (INPUT) triggers driver chip U1, thereby controlling the on / off switching of MOS transistor M1, discharging the capacitor, and driving the LED. MOS transistor M1 has a high response speed and can withstand high transient currents.

[0031] In this embodiment, the S-pole of the MOS transistor M1 is grounded, and the D-pole of the MOS transistor M1 is connected to the cathode of the LED chip 3 via a power resistor. Both ends of the power resistor are connected to an external wiring port P1, which is connected to an external monitoring device. The power resistor (Rsense) is used to monitor the current through the LED chip 3 to prevent damage to the LED chip 3 due to excessive current. The diode D1 protects the LED chip 3 from harmful reverse currents that may be generated during rapid circuit switching. This high-power, high-speed strobe LED light source also includes a diode D1. The anode of the diode D1 is connected to the junction between the D-pole of the MOS transistor M1 and the power resistor, and the cathode of the diode D1 is connected to the anode of the LED chip 3. Diode D1 protects the LED chip.

[0032] In this embodiment, a switch 6 is further provided at the rear end of the housing 1. The LED power input port 5 is directly electrically connected to the positive electrode of the LED chip 3 or electrically connected to the capacitor module through the switch 6, thereby realizing switching between constant light and strobe light to meet user needs. Furthermore, the switch 6 is a double-pole double-throw switch used to control whether the LED chip 3 is constant light or strobe light. When the switch 6 is in the middle position (the position in the figure), the LED chip 3 is in the OFF position; when S1 is biased to the left, the LED chip 3 is in the strobe light position, and the LED power input port 5 is connected to the strobe drive circuit. The LED power input port 5 charges the capacitor module. The driver chip U1 controls the on / off of the MOS tube M1 according to the input TTL signal, thereby controlling the on / off of the capacitor module and the LED chip circuit, thereby controlling the light emission of the LED chip 3.

[0033] In this embodiment, the housing 1 is further provided with a heat sink 7. The LED chip 3 is mounted on one side of the heat sink 7, and a cooling fan 8 is mounted on the other side of the heat sink 7. This facilitates heat dissipation and effectively increases the product's service life. Furthermore, the LED chips are assembled on the heat sink in a modular manner, facilitating the color change of the light source. Furthermore, the housing is provided with a power input port 9, through which the cooling fan 8 and driver chip U1 are connected to an external power source.

[0034] Working principle:

[0035] An external power source is connected to LED power input port 5 to charge capacitors C1-C5. When operating at a low duty cycle, the capacitor module can recharge between pulses, allowing the system to operate continuously. By configuring five capacitors C1-C5 with different capacities, the output voltage stability of the strobe driver circuit can be increased, thereby improving the luminous stability of the LED chip. A TTL square wave input signal (INPUT) triggers driver chip U1, which controls the on / off switching of MOS transistor M1, controlling the capacitor discharge and driving the LED light.

Claims

1. A high-power, high-speed stroboscopic LED light source, characterized in that It comprises a housing (1), a lens module (2) detachably connected to the front end of the housing (1), an LED chip (3) arranged in the housing (1) corresponding to the lens module (2), and a strobe drive circuit arranged in the housing (1) and electrically connected to the LED chip (3). The strobe drive circuit comprises a drive chip U1, a MOS tube M1, and a capacitor module. The input end of the drive chip U1 is connected to an external signal via a TTL signal input port (4), and the output end of the drive chip U1 is connected to the negative electrode of the LED chip (3) via the MOS tube M1. The rear end of the housing (1) is provided with an LED power input port (5). One end of the capacitor module is divided into two paths, one path is electrically connected to the LED power input port (5), and the other path is connected to the positive electrode of the LED chip (3). The other end of the capacitor module is grounded. The strobe drive circuit is used to increase the instantaneous luminous brightness of the LED chip (3).

2. The high-power, high-speed, stroboscopic LED light source according to claim 1, characterized in that The capacitor module is mainly composed of several capacitors with different capacitance values ​​connected in parallel.

3. The high-power, high-speed stroboscopic LED light source according to claim 2, characterized in that The capacitor module includes a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4 and a capacitor C5, and the capacitors C1, C2, C3, C4 and C5 are connected in parallel.

4. The high-power, high-speed stroboscopic LED light source according to claim 2, characterized in that The driver chip U1 has eight pins, the first pin VDD and the eighth pin VDD of the driver chip U1 are connected to an external power supply, the second pin IN of the driver chip U1 is connected to the TTL signal input port (4), and the fourth pin AGND of the driver chip U1 is grounded; The fifth pin PGND of the driver chip U5 is divided into two paths, one path is connected to the external power supply through the parallel capacitors C6 and C7, and the other path is grounded; the sixth pin OUT and the seventh pin OUT of the driver chip U5 are connected to the G pole of the MOS tube M1 through the resistor R1.

5. The high-power, high-speed stroboscopic LED light source according to claim 2, characterized in that The S pole of the MOS tube M1 is grounded, and the D pole of the MOS tube M1 is connected to the negative pole of the LED chip (3) via a power resistor; both ends of the power resistor are externally connected to a connection port P1.

6. The high-power, high-speed stroboscopic LED light source according to claim 5, characterized in that It also includes a diode D1, the anode of the diode D1 is connected to the node between the D pole of the MOS tube M1 and the power resistor, and the cathode of the diode D1 is connected to the anode of the LED chip (3).

7. The high-power, high-speed stroboscopic LED light source according to claim 2, characterized in that The driving chip U1 is a gate driver.

8. The high-power, high-speed stroboscopic LED light source according to any one of claims 1 to 7, characterized in that A switching switch (6) is also provided at the rear end of the housing (1), and the LED power input port (5) is directly electrically connected to the positive electrode of the LED chip (3) through the switching switch (6) or is electrically connected to the capacitor module through the switching switch (6).

9. The high-power, high-speed stroboscopic LED light source according to claim 8, characterized in that A heat sink (7) is also provided in the housing (1), the LED chip (3) is mounted on one side of the heat sink (7), and a heat dissipation fan (8) is mounted on the other side of the heat sink (7).

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