TWM527515U - Construction vehicle LED searchlight driving circuit board structure - Google Patents

Description

Engineering vehicle LED searchlight drive circuit board structure

This creation is related to an engineering vehicle LED searchlight drive circuit board structure that is installed on an engineering vehicle to avoid burning of the IC drive circuit and thereby improve the safety of the searchlight.

According to the engineering vehicles on the market, such as stacker vehicles, in order to increase the safety of work at night, it is often necessary to install searchlights on the vehicle (high places) to enhance the brightness of the high working environment; Most of the searchlights installed on vehicles are implemented with more durable and power-saving LED searchlights; conventional LED searchlights are usually driven by the battery on the vehicle and the working electric motor on the vehicle (such as the hydraulic motor or the stacker drive motor). In parallel, the working electric motor is in the process of working electricity, and it is bound to cause abnormal high voltage or surge instantaneously due to the instantaneous change of the load (or the strong back electromotive force due to the motor). The IC driver circuit of the conventional LED searchlight is often unable to withstand such transient high voltage and surge, and burns.

The main purpose of the present invention is to provide an LED searchlight driving circuit board structure for an engineering vehicle, wherein an LED lighting module and a driving circuit board are disposed in a light-transmitting lamp cover of a searchlight; the driving circuit board is an IC driving circuit a surge protection circuit as an electric a source input end, and the power input end is connected to at least one working electric motor on the engineering vehicle, and the working power is obtained from the battery charged by the generator, and the LED lighting module is driven to generate an illumination source; the surge protection The circuit is provided with a first diode and a first inductor and a second inductor connected in parallel with each other, and one end of the first and second inductors is connected in parallel with a second diode for forming a discharge loop. a first resistor for energy elimination and a pair of high frequency forming a filtered first capacitor, and at the other end, a pair of second capacitors for high frequency generation filtering and a polar capacitor for voltage stabilization filtering at a low frequency are connected in parallel; When the searchlight is installed on the construction vehicle to provide illumination, the power input of the drive circuit board of the searchlight is caused by the difference in the working nature or condition of the working electric motor, and the surge protection circuit is generated when the power supply has abnormal voltage rise or surge. The first and second inductors can eliminate the instantaneous high voltage and the surge under the action of the second diode forming the discharge loop, and the instantaneous energy of the first resistor And elimination of the first and second polarity capacitor with high capacitance, low-frequency filter, whereby the drive IC protection circuit, to avoid burning, improve safety in the work vehicle headlight installation used.

The second objective of the present invention is to provide an LED searchlight driving circuit board structure for an engineering vehicle, wherein the IC driving circuit of the driving circuit board is an IC driving chip driving the LED light through a boosting circuit and a certain pressure detecting circuit. The module is illuminated by a field effect transistor (MOSFET) triggered by the IC driving chip, a third inductor connected in series with the field effect transistor, and a parallel connection between the field effect transistor and the first Between the three inductors, a third diode connected in series with the LED lighting module, and a fourth capacitor connected in parallel with the LED lighting module; the constant voltage detecting loop has a three-terminal adjustable parallel connection a voltage regulator (TL431) and a transistor, the three-terminal adjustable shunt regulator is a voltage reference regulated by a plurality of resistors and a fifth capacitor, the transistor is set by a resistor at each end, Subject to the three-terminal adjustable shunt regulator When generating, generating a detection signal for the IC driving chip; and boosting the power supply by the boosting circuit, so that the IC driving chip can drive the LED lighting module to emit light with the boosted power source, and the contact of the IC driving circuit If there is a bad contact or fault, or if the LED lighting module fails to be connected in series, the constant voltage detection circuit detects an abnormal boost on the line, and generates a detection signal on the IC driving chip end, and then passes through the IC. The driving chip controls the field effect transistor to turn off the driving power of the LED lighting module, thereby enabling the operation of the LED lighting module to achieve the protection effect of automatically turning off the power when the line is abnormal; and further, the boosting circuit The grounding end of the field effect transistor is provided with an RC filter current limiting circuit composed of a plurality of resistors and a sixth capacitor, which can increase the stability of the working power of the LED lighting module.

A further object of the present invention is to provide an LED searchlight driving circuit board structure for an engineering vehicle, wherein an IC driving circuit of the driving circuit board is an IC driving chip driving the LED light through a step-down circuit and a certain voltage detection circuit. The module is illuminated; the step-down circuit is a field effect transistor (MOSFET) triggered by the IC driving chip, a third diode connected in series with the field effect transistor, and a parallel connection between the field effect transistor and the field effect transistor The third diode is composed of a third inductor connected in series with the LED lighting module, and a fourth capacitor connected in parallel with the LED lighting module; the constant voltage detecting loop has a three-terminal adjustable A shunt regulator (TL431) and a transistor, the three-terminal adjustable shunt regulator is a voltage reference regulated by a plurality of resistors and a fifth capacitor, and the transistor is set by a resistor at each end When triggered by the three-terminal adjustable shunt regulator, a detection signal is generated on the IC driving chip; the buck circuit is used to form a step-down effect on the power supply, so that the IC driving chip can drive the LED to emit light with a step-down power supply. The module is illuminated, and the contacts of the IC driver circuit are Poor or faulty contact or LED module has failed to connect properly, constant pressure on the line detecting circuit detecting abnormal pressure is generated on the drive IC chip terminal By detecting the action of the signal, the driving power supply of the LED lighting module can be turned off by the IC driving chip control field effect transistor, thereby enabling the operation of the LED lighting module to achieve automatic power-off protection when a line abnormality is encountered. In addition, the field effect transistor grounding end of the step-down circuit is provided with an RC filter current limiting circuit composed of a plurality of resistors and a sixth capacitor, which can increase the stability of the operating power of the LED lighting module. .

10‧‧‧Searchlights

11‧‧‧Lighting lampshade

12‧‧‧LED lighting module

13‧‧‧Drive electric board

130‧‧‧IC drive circuit

U ₁ ‧‧‧IC driver chip

R ₂ ‧‧‧second resistance

C ₃ ‧‧‧third capacitor

131‧‧‧ Surge protection circuit

D ₁ ‧‧‧First Diode

L ₁ ‧‧‧first inductance

L ₂ ‧‧‧second inductance

D ₂ ‧‧‧Secondary

R ₁ ‧‧‧first resistance

C ₁ ‧‧‧first capacitor

C ₂ ‧‧‧second capacitor

E ₁ ‧‧‧Polar capacitor

132‧‧‧Power input

133‧‧‧Boost loop

133A‧‧‧Buck loop

Q ₁ ‧‧‧ Field Effect Crystal

L ₃ ‧‧‧ third inductance

D ₃ ‧‧‧third diode

C ₄ ‧‧‧fourth capacitor

134‧‧‧ Constant pressure detection circuit

U ₂ ‧‧‧Three-terminal adjustable shunt regulator

Q ₂ ‧‧‧Optoelectronics

R ₃ , R ₄ , R ₅ , R ₆ , R ₇ ‧ ‧ resistance

C ₅ ‧‧‧ fifth capacitor

135‧‧‧RC filter current limiting circuit

C ₆ ‧‧‧ sixth capacitor

R ₈ , R ₉ , R ₁₀ , R ₁₁ ‧‧‧resistors

20‧‧‧Working electric motor

30‧‧‧Generator

40‧‧‧Charger

BT‧‧‧Battery

Figure 1 is a perspective view of the appearance of the searchlight

Figure 2 is a schematic view of the cross-sectional structure of the searchlight

FIG. 3 is an embodiment of an equivalent circuit diagram of the driving circuit board of the present invention.

4 is another embodiment of an equivalent circuit diagram of the present driving circuit board

The present invention is directed to the above object, and the preferred embodiment is described in detail with reference to the accompanying drawings. The following is a detailed description of the structure of an LED searchlight driving circuit board for an engineering vehicle, as shown in Figures 1, 2 and 3, which is a searchlight 10 The LED housing 11 is provided with an LED lighting module 12 and a driving circuit board 13; the driving circuit board 13 is an IC driving circuit 130 through a surge protection circuit 131 as a power input terminal 132, and is input by the power supply. The end 132 parallelizes at least one working electric motor 20 on the engineering vehicle, and obtains working power from the battery BT charged by a generator 30 (via the charger 40), and drives the LED lighting module 12 to emit illumination to generate an illumination source; The wave protection circuit 130 is provided with a first diode D1 and a first inductor and a second inductor connected in parallel with each other. One ends of the first and second inductors L ₁ and L ₂ are used in parallel. Forming a second diode D _{2 of the} discharge circuit, a first resistor R ₁ for energy elimination and a pair of high frequency forming a filtered first capacitor C ₁ , and at the other end, a pair of high frequency generating filters are connected in parallel a second capacitor C _2, and one for low Forming polar capacitor filter regulator E _1; when the searchlight 10 mounted to a construction vehicle (not shown) provided on the illumination process, the driving circuit board 10 searchlight power input 13 20 132 by operation of the electric motor work load characteristics or conditions When the difference is changed, and the power supply has an abnormal boost or a surge, the surge protection circuit 131 旳 the first and second inductors L ₁ and L ₂ , that is, the second diode D _{2 can} form a discharge loop. Eliminating the instantaneous high voltage and surge of the power supply, and eliminating the instantaneous energy elimination of the first resistor R ₁ and the high and low frequency filtering of the first and second capacitors C ₁ , C ₂ and the polar capacitor E ₁ , thereby protecting the IC driving circuit 130 To avoid burning, improve the safety of the searchlight 10 installed on the construction vehicle.

According to the embodiment, wherein FIG. 3, the drive IC circuit 130 of the driving circuit board 13, a driver IC chip based U ₁ (ground state having a second resistor R ₂ and a third capacitor C ₃ determined frequency The LED lighting module is driven to emit light through a boosting circuit 133 and a certain pressure detecting circuit 134. The boosting circuit 133 is a field effect transistor Q ₁ (MOSFET) triggered by the IC driving wafer U ₁ . a third inductor L ₃ connected in series with the field effect transistor, a third diode connected in parallel between the field effect transistor Q ₁ and the third inductor L ₃ , and in series with the LED lighting module 12 D ₃ , and a fourth capacitor C ₄ connected in parallel with the LED lighting module 12; the constant voltage detecting circuit 134 has a three-terminal adjustable shunt regulator U ₂ (TL431) and a transistor Q ₂ The three-terminal adjustable shunt regulator U ₂ is regulated by a plurality of resistors R ₃ , R ₄ , R ₅ and a fifth capacitor C ₅ , and the transistor Q ₂ is The setting of the resistors R ₆ and R ₇ generates a detection signal for the IC driving wafer U ₁ when triggered by the three-terminal adjustable shunt regulator U ₂ ; the power is applied by the boosting circuit 133 The source forms a boosting effect, so that the IC driving chip U ₁ can drive the LED lighting module 12 to emit light with the boosted power source, and if the contact of the IC driving circuit 130 has poor contact or is faulty or has the LED lighting module 12 when the series was not successful, the constant-pressure detecting circuit detecting the line 134 (power) abnormal pressure, generating an operation detection signal to the _end (CS pin) IC driver chip U, through the driver IC chip to U ₁ The control field effect transistor Q ₁ turns off the driving power of the LED lighting module 12, thereby enabling the (lighting illumination) operation of the LED lighting module 12, and achieving automatic power-off protection when a line abnormality (or failure) is encountered. Further, the grounding transistor Q _{1 of} the boosting circuit 133 is provided with an RC filter composed of a plurality of resistors R ₈ , R ₉ , R ₁₀ , R ₁₁ and a sixth capacitor C ₆ . The current limiting circuit 135 can increase the stability of the working power of the LED lighting module 12.

According to the embodiment, wherein FIG. 4, the drive circuit of the driving IC circuit board, a line driver IC wafer ₁ U (ground state having a second resistor R ₂ and a third capacitor C ₃ determined frequency) The LED lighting module 12 is driven to emit light through a step-down circuit 133A and a certain voltage detecting circuit 134. The step-down circuit 133A is a field effect transistor Q ₁ (MOSFET) triggered by the IC driving chip U ₁ . a third diode D ₃ connected in series with the field effect transistor Q ₁ , connected in parallel between the field effect transistor Q ₁ and the third diode D ₃ , and connected in series with the LED lighting module 12 a third inductor L ₃ and a fourth capacitor C ₄ connected in parallel to the LED lighting module 12; the constant voltage detecting loop 134 has a three-terminal adjustable shunt regulator U ₂ (TL431) and an electric The crystal Q ₂ , the three-terminal adjustable shunt regulator U ₂ , is regulated by a plurality of resistors R ₃ , R ₄ , R ₅ and a fifth capacitor C ₅ , and the transistor Q ₂ is composed of two ends Each of the resistors R ₆ and R ₇ is configured to generate a detection signal for the IC driving wafer U ₁ when triggered by the three-terminal adjustable shunt regulator U ₂ ; A power supply is formed antihypertensive effect to enabling the drive IC chip U ₁ LED module 12 can be driven down to the emission power, and the contact IC driver circuit 130, or if poor contact or faulty LED module 12 When there is a failure to connect properly, the constant pressure detection circuit 134 detects an abnormal boost on the line, and generates a detection signal for the IC drive wafer U ₁ end (CS pin), and can control the field effect through the IC drive wafer U _{1 .} The transistor Q ₁ turns off the driving power of the LED lighting module 12, thereby enabling the (lighting illumination) operation of the LED lighting module 12, and achieving the protection effect of automatically turning off the power when a line abnormality (or failure) is encountered; and the step-down circuit 133A of the field effect transistor Q ₁ is provided with a ground line by a plurality of resistors _{R 8, R 9, R 10} , RC filter R ₁₁ and a sixth capacitor C ₆ of limiting circuit consisting of 135, can increase the stability of the working power of the LED lighting module 12

The above description is intended to be illustrative, and not restrictive, and many modifications, variations or equivalents may be made without departing from the spirit and scope of the invention. , but all will fall within the scope of this creation.

12‧‧‧LED lighting module

13‧‧‧Drive electric board

130‧‧‧IC drive circuit

U ₁ ‧‧‧IC driver chip

R ₂ ‧‧‧second resistance

C ₃ ‧‧‧third capacitor

131‧‧‧ Surge protection circuit

D ₁ ‧‧‧First Diode

L ₁ ‧‧‧first inductance

L ₂ ‧‧‧second inductance

D ₂ ‧‧‧Secondary

R ₁ ‧‧‧first resistance

C ₁ ‧‧‧first capacitor

C ₂ ‧‧‧second capacitor

E ₁ ‧‧‧Polar capacitor

132‧‧‧Power input

133‧‧‧Boost loop

Q ₁ ‧‧‧ Field Effect Crystal

L ₃ ‧‧‧ third inductance

D ₃ ‧‧‧third diode

C ₄ ‧‧‧fourth capacitor

134‧‧‧ Constant pressure detection circuit

U ₂ ‧‧‧Three-terminal adjustable shunt regulator

Q ₂ ‧‧‧Optoelectronics

R ₃ , R ₄ , R ₅ , R ₆ , R ₇ ‧ ‧ resistance

C ₅ ‧‧‧ fifth capacitor

135‧‧‧RC filter current limiting circuit

C ₆ ‧‧‧ sixth capacitor

R ₈ , R ₉ , R ₁₀ , R ₁₁ ‧‧‧resistors

20‧‧‧Working electric motor

30‧‧‧Generator

40‧‧‧Charger

BT‧‧‧Battery

Claims (5)

An LED searchlight driving circuit board structure of an engineering vehicle is provided with an LED lighting module and a driving circuit board in a light-transmitting lamp cover of a searchlight; the driving circuit board is an IC driving circuit through a surge protection circuit as a power source An input end, and the power input end is connected to at least one working electric motor on the engineering vehicle, and the working power is obtained from the battery charged by the generator, and the LED lighting module is driven to generate an illumination source; the surge protection circuit The power input end is provided with a first diode and a first inductor and a second inductor connected in parallel with each other, and one end of the first and second inductors is connected in parallel with a second diode for forming a discharge loop. a first resistor for energy elimination and a pair of high frequency to form a filtered first capacitor, and at the other end, a pair of second capacitors for high frequency generation filtering and a polar capacitor for voltage stabilization filtering at a low frequency are connected in parallel; The searchlight is installed on the construction vehicle to provide illumination. The power input of the drive circuit board of the searchlight varies due to the working nature or condition of the working electric motor. When the power supply has an abnormal boost or a surge, the surge protection circuit has the first and second inductances, which can eliminate the instantaneous high voltage and the surge under the action of the second diode forming the discharge loop, and cooperate with the first The instantaneous energy elimination of the resistor and the high and low frequency filtering of the first and second capacitors and the polar capacitor, thereby protecting the IC driving circuit, avoiding burning, and improving the safety of the searchlight for installation on the construction vehicle. The LED searchlight driving circuit board structure of the engineering vehicle according to the first aspect of the patent application, wherein the IC driving circuit of the driving circuit board is an IC driving chip driving the LED light through a boosting circuit and a certain pressure detecting circuit. The module is illuminated by a field effect transistor (MOSFET) triggered by the IC driving chip, a third inductor connected in series with the field effect transistor, and a parallel connection between the field effect transistor and the first a third diode connected in series with the LED lighting module, and a fourth capacitor connected in parallel with the LED lighting module The constant voltage detection loop has a three-terminal adjustable shunt regulator (TL431) and a transistor, and the three-terminal adjustable shunt regulator is a voltage reference regulated by a plurality of resistors and a fifth capacitor. The transistor is set by a resistor at both ends, and when triggered by the three-terminal adjustable shunt regulator, a detection signal is generated on the IC driving chip; and a boost circuit is used to boost the power supply. The function is to enable the IC driver chip to drive the LED lighting module to emit light with the boosting power source, and if the contact of the IC driving circuit is in poor contact or faulty or fails to be properly connected with the LED lighting module, the constant voltage The detection loop detects an abnormal boost on the line, and generates a detection signal for the IC driving the chip end, and can control the field effect transistor to turn off the driving power of the LED lighting module through the IC driving chip, thereby enabling the LED to emit light. The work of the module achieves the protection effect of automatically turning off the power when a line abnormality is encountered. The LED searchlight driving circuit board structure of the engineering vehicle according to the second aspect of the patent application, wherein the field effect transistor grounding end of the boosting circuit is provided with an RC filtering limit composed of a plurality of resistors and a sixth capacitor. The flow loop can increase the stability of the working power of the LED lighting module. The LED searchlight driving circuit board structure of the engineering vehicle according to the first aspect of the patent application, wherein the IC driving circuit of the driving circuit board is an IC driving chip driving the LED light through a step-down circuit and a certain pressure detecting circuit. The module is illuminated; the step-down circuit is a field effect transistor (MOSFET) triggered by the IC driving chip, a third diode connected in series with the field effect transistor, and a parallel connection between the field effect transistor and the field effect transistor The third diode is composed of a third inductor connected in series with the LED lighting module, and a fourth capacitor connected in parallel with the LED lighting module; the constant voltage detecting loop has a three-terminal adjustable A shunt regulator (TL431) and a transistor, the three-terminal adjustable shunt regulator is a voltage reference regulated by a plurality of resistors and a fifth capacitor, and the transistor is set by a resistor at each end When triggered by the three-terminal adjustable shunt regulator, A detection signal is generated on the IC driving chip; the voltage-reducing effect is formed on the power supply by the step-down circuit, so that the IC driving chip can drive the LED lighting module to emit light by the step-down power supply, and if the contact of the IC driving circuit is in poor contact In case of failure or failure to connect with the LED lighting module, the constant voltage detection loop detects an abnormal boost on the line, and generates a detection signal on the IC driving chip end, so that the IC driver chip can control the field effect. The transistor turns off the driving power of the LED lighting module, and accordingly, the LED lighting module can work to achieve the protection effect of automatically turning off the power when a line abnormality is encountered. According to the fourth aspect of the patent application, the LED searchlight driving circuit board structure of the engineering vehicle, wherein the field effect transistor grounding end of the step-down circuit is provided with an RC filtering limit composed of a plurality of resistors and a sixth capacitor. The flow loop can increase the stability of the working power of the LED lighting module.