CN212519506U - Multi-channel LED constant-current boosting driving circuit system and control chip thereof - Google Patents
Multi-channel LED constant-current boosting driving circuit system and control chip thereof Download PDFInfo
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- CN212519506U CN212519506U CN202020944443.7U CN202020944443U CN212519506U CN 212519506 U CN212519506 U CN 212519506U CN 202020944443 U CN202020944443 U CN 202020944443U CN 212519506 U CN212519506 U CN 212519506U
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Abstract
The utility model provides a multichannel LED constant current drive circuit system that steps up and control chip thereof. The control chip comprises a control logic module, a dimming control module and a multi-channel current control module, wherein the control logic module is used for controlling a direct current-to-direct current (DC-DC) constant current boost switch circuit in a multi-channel LED constant current boost driving circuit system, and the DC-DC constant current boost switch circuit is connected with a plurality of paths of LED load circuits which are connected in parallel so as to control the constant current boost switch of the plurality of paths of LED load circuits; the dimming control module is used for generating a dimming control signal for the multi-channel current control module based on an external dimming signal; and the multi-channel current control module is connected with the multi-channel LED load circuits so as to simultaneously control the constant current output values of the multi-channel LED load circuits based on the dimming control signals from the dimming control module.
Description
Technical Field
The utility model relates to a circuit field, more specifically relates to a multichannel LED constant current drive circuit system that steps up and control chip thereof.
Background
A Light Emitting Diode (LED) is a semiconductor device that converts electrical energy into Light energy. The demand for large-size high-power LED backlight products in the market is increasing at present. The single-channel LED controlled direct current-direct current (DC-DC) constant current boost driving circuit needs to be matched with more peripheral devices, so that the single-channel LED controlled DC-DC constant current boost driving circuit has the defects of complex circuit, large occupied space area of a Printed Circuit Board (PCB) and the like.
SUMMERY OF THE UTILITY MODEL
In view of the above problem, the utility model provides a high efficiency, high integrated multichannel LED constant current boost drive circuit system and be used for the control chip of this system.
According to the utility model discloses a control chip for multichannel LED constant current drive circuit system that steps up, including control logic module, dimming control module and multichannel current control module, wherein: the control logic module is used for controlling a direct current-to-direct current (DC-DC) constant current boost switch circuit in the multi-channel LED constant current boost driving circuit system, and the DC-DC constant current boost switch circuit is connected with a plurality of parallel LED load circuits so as to control the constant current boost switch of the plurality of LED load circuits; the dimming control module is used for generating a dimming control signal for the multi-channel current control module based on an external dimming signal; and the multi-channel current control module is connected with the multi-channel LED load circuits so as to simultaneously control the constant current output values of the multi-channel LED load circuits based on the dimming control signals from the dimming control module.
In one embodiment, the multi-channel current control module is connected with a current setting pin of the control chip, and the current setting pin is connected to the ground through a first resistor, wherein the resistance value of the first resistor can be adjusted to set the maximum constant current output value of the multi-channel LED load circuit.
In one embodiment, the dimming control module is connected with a dimming signal input pin of the control chip for receiving an external dimming signal and is connected with a low-pass filtering pin of the control chip; when the low-pass filtering pin is suspended, the dimming control module generates the dimming control signal directly based on the external dimming signal; and when the low-pass filtering pin is connected to the ground through the first capacitor, the dimming control module generates the dimming control signal based on the analog dimming signal converted from the external dimming signal.
In one embodiment, the control logic module is connected with a loop compensation pin of the control chip for loop compensation, and the loop compensation pin is connected to the ground through a second resistor and a second capacitor.
In one embodiment, the control logic module is connected with an overvoltage protection pin of the control chip to be connected to an overvoltage protection circuit in the multi-channel LED constant-current boost driving circuit system.
In one embodiment, the control chip further includes an oscillator and an operating frequency setting pin, one end of the oscillator is connected to the control logic module, the other end of the oscillator is connected to the operating frequency setting pin, the operating frequency setting pin is connected to the ground through a third resistor, and a resistance value of the third resistor can be adjusted to set the operating frequency of the control chip.
In one embodiment, the control chip further comprises: the power supply input pin is connected with an input voltage source of the multi-channel LED constant-current boost driving circuit system and used for supplying power to the control chip; the enable input pin is used for receiving an external control signal to control the on and off of the control chip; the external switching tube grid driving pin is respectively connected to a control logic module in the control chip and a grid of a switching tube in the DC-DC constant-current boost switching circuit so as to control the switching tube to be switched on and off; and the current sensing pin is connected to the control logic module in the control chip and is connected to the source electrode of the switching tube through a fourth resistor so as to sense the peak current flowing through the boosting energy storage inductor in the DC-DC constant-current boosting switching circuit.
According to the utility model discloses a multichannel LED constant current boost drive circuit system for drive parallelly connected multichannel LED load circuit simultaneously, this system including the signal source of adjusting luminance, direct current change direct current DC-DC constant current boost switch circuit that provide the outside signal of adjusting luminance and as above any embodiment control chip.
In one embodiment, the DC-DC constant-current boost switching circuit includes a boost energy storage inductor, a diode, a switching tube, a third capacitor, and a fifth resistor, a first end of the boost energy storage inductor is connected to the input voltage source, a second end of the boost energy storage inductor is connected to a drain of the switching tube and an anode of the diode, a cathode of the diode is connected to a first end of the third capacitor and to the multiple LED load circuits connected in parallel, a first end of the fifth resistor is connected to a source of the switching tube, a gate of the switching tube is connected to an external switching tube gate driving pin of the control chip, and a second end of the third capacitor and a second end of the fifth resistor are connected to ground.
In one embodiment, the multi-channel LED constant-current boost driving circuit system further includes an overvoltage protection circuit, which includes a first voltage-dividing resistor and a second voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor is connected to a first end of the third capacitor, a second end of the first voltage-dividing resistor is connected to a first end of the second voltage-dividing resistor and an overvoltage protection pin of the control chip, and a second end of the second voltage-dividing resistor is connected to ground.
For traditional single channel LED constant current drive circuit system that steps up, the utility model provides a high efficiency, high integrated multichannel LED constant current drive circuit system that steps up, this system can utilize single control chip to realize carrying out on-off control and adjustting of the lighteness simultaneously to parallelly connected multichannel LED load circuit.
Drawings
The invention may be better understood from the following description of particular embodiments thereof taken in conjunction with the accompanying drawings, in which:
fig. 1 shows a schematic structural diagram of a multi-channel LED constant current boost driving circuit system according to an embodiment of the present invention; and is
Fig. 2 shows an internal structural schematic diagram of a control chip for multi-channel LED constant current boost driving according to an embodiment of the present invention.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below with reference to the accompanying drawings. Example implementations can be embodied in many forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example implementations to those skilled in the art. In the drawings, the size of regions and components may be exaggerated for clarity. Further, in the drawings, the same reference numerals denote the same or similar structures, and thus detailed descriptions thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the invention. One skilled in the relevant art will recognize, however, that the invention may be practiced without one or more of the specific details, or with other methods, components, materials, and so forth. In other instances, well-known structures, materials, or operations are not shown or described in detail to avoid obscuring the primary technical ideas of the invention.
For traditional single channel LED constant current drive circuit system that steps up, the utility model provides a high efficiency, high integrated multichannel LED constant current drive circuit system that steps up, this system can utilize single control chip to realize carrying out on-off control and adjustting of the lighteness simultaneously to parallelly connected multichannel LED load circuit.
Exemplary embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a multi-channel LED constant current boost driving circuit system according to an embodiment of the present invention. As shown in fig. 1, the driving circuit system may include a dimming signal source providing an external dimming signal (e.g., a pulse width modulation PWM signal), a control chip U1, a DC-DC constant-current boost switching circuit 110, and an overvoltage protection circuit 120. The driving circuit system can simultaneously drive a plurality of paths of LED load circuits which are connected in parallel.
As shown in fig. 1, as an example, the control chip U1 may include a power supply input VIN pin, an enable input ENA pin, an output voltage VCC pin, an external switch GATE drive GATE pin, a chip ground GND pin, an over-voltage protection OVP pin, a loop compensation CMP pin, a current sensing CS pin, a current setting ISET pin, a pulse width modulation PWM pin, a low pass filtering LPF pin, an operating frequency setting RI pin, and an LED 1-LED 4 pin. Note that only possible examples of the pins of the control chip U1 are shown here, and the control chip U1 may be designed to include other pins as needed to implement the corresponding control functions. Fig. 2 shows an internal structural schematic diagram of a control chip for multi-channel LED constant current boost driving according to an embodiment of the present invention, and thus each pin in the control chip and its corresponding control function are described in detail below with reference to fig. 1 and 2.
The supply input VIN pin may be used to power the control chip U1, which may be connected to an input voltage source VIN. As an example, the input voltage source Vin may be connected to the supply input Vin pin via a fuse. For example, as shown in fig. 2, when the input voltage provided by the input voltage source Vin to the control chip U1 reaches a voltage threshold preset by an under voltage protection (UVLO) module of the control chip U1, the control chip U1 may start normal start-up.
The enable input ENA pin may be used to receive external control signals to control the on and off of the control chip U1. The output voltage VCC pin may be used to provide the output voltage of a low voltage linear regulator (LDO) module inside the control chip U1.
The external switching tube GATE driving GATE pin can provide a control signal to the GATE of the switching tube outside the control chip U1 to control the switching tube to be turned on and off, so as to realize the interconversion of the electric energy and the magnetic field energy. For example, the external switch GATE drive GATE pin may be connected to the GATE of the switch Q1 in the DC-DC constant current boost switch circuit 110. The control chip U1 can provide a high-low level square wave signal to the GATE driver GATE pin of the external switch tube through its internal control logic module to control the on/off of the switch tube Q1. When the switch tube Q1 switches on, the energy storage inductance L1 that steps up in the DC-DC constant current boost switch circuit 110 can convert the electric energy into magnetic field energy and store energy, and when the switch tube Q1 switches off, the energy storage inductance L1 that steps up can convert the magnetic field energy of storage into the electric energy to can realize the interconversion of electric energy and magnetic field energy.
The chip ground GND pin may be used as a reference ground for the control chip U1.
An overvoltage protection OVP pin may be used to overvoltage protect the output voltage of the LED load circuit, which may be connected to the overvoltage protection circuit 120. When the output voltage is too high or reaches the open-circuit voltage, the control chip U1 can turn off the control chip U1 through the OVP protection module, so that the output voltage can be turned off to realize overvoltage protection.
The loop compensation CMP leg may be the output of an error amplifier in the control chip U1 for loop compensation to make the loop more stable. In particular, the CMP leg may be grounded, for example, via a capacitor or via a series circuit of a resistor and a capacitor, thereby achieving loop compensation, which is not limited by the present invention. As an example, as shown in fig. 1, the CMP pad may be grounded via a series circuit of a capacitor C2 and a resistor R2, so as to implement loop compensation, wherein the capacitor C2 may be a patch capacitor, which is not limited by the present invention.
The current sense CS pin may be used to detect the peak current flowing through the boost energy storage inductor L1. The control chip U1 samples the current of the boost energy storage inductor L1 through the CS pin, and the detection of the inductor peak current is realized through a current detection module in the control chip U1. As an example, the input inductor current detection pin CS may be connected to the source of the switching tube Q1 and the first end of the resistor R5 in the DC-DC constant current boost switching circuit 110 via the resistor R4.
The current setting ISET pin may be connected with the multi-channel current control module of the control chip U1 and connected to ground via resistor R1. The maximum constant current output value of the multi-path LED load circuit controlled by the multi-path current control module can be set by adjusting the resistance value of the resistor R1.
The PWM pin may be used to receive an external dimming signal to adjust the brightness of the LEDs in the LED load circuit. For example, the external dimming signal may be a signal (e.g., a voltage signal) with an adjustable duty cycle (e.g., adjustable between 1% -100%), and the LEDs in the LED load circuit may be dimmed (e.g., the dimming may be adjusted between 1% -100%).
The LPF pin may be used to sample an externally set capacitor or floating signal, and the dimming control module in the control chip U1 may identify whether dimming control is performed directly based on the external dimming signal or based on an analog dimming signal converted from the external dimming signal. For example, as shown in fig. 1, when the LPF pin is suspended, the dimming control module directly generates the dimming control signal based on the external dimming signal to perform dimming control; when the LPF pin is connected to ground via the capacitor C1, the dimming control module generates a dimming control signal based on the analog dimming signal converted from the external dimming signal to perform dimming control.
The RI pin can be used to sample different resistance values set externally and set different operating frequencies of the control chip U1 in conjunction with an Oscillator (OSC) module of the control chip U1.
The pins LED1 to LED4 can be connected to a multi-channel current control module in the control chip U1 to control the constant current output values of the four LED lamp strings respectively and simultaneously. Here, four LED strings are shown as an example of a multi-path LED load circuit, but it should be noted that the technical solution of the present invention can be applied to more or less paths of LED load circuits. As shown in FIG. 1, the four LED light strings are connected in parallel, wherein each LED light string may include any suitable number of LED light beads. In addition, LED lamp pearl can be straight following formula or side income formula LED lamp pearl, the utility model discloses do not restrict this.
The above is a detailed description of an example pin of the control chip U1. The internal structure of the control chip U1 and the multi-channel LED constant-current boost driving circuit system will be described in detail with reference to fig. 1 and 2.
As shown in fig. 2, the control chip U1 includes a control logic module, a dimming control module, and a multi-channel current control module. The control logic module is used for controlling the DC-DC constant current boost switching circuit 110 in the multi-channel LED constant current boost driving circuit system shown in fig. 1. The DC-DC constant current boost switching circuit 110 is connected to the multiple LED load circuits connected in parallel to perform constant current boost switching control on the multiple LED load circuits.
As shown in fig. 1, the DC-DC constant current boost switch circuit 110 may include a boost energy storage inductor L1, a freewheeling diode D1, a switching tube Q1, a capacitor C3, and a resistor R5. A first end of the boost energy storage inductor L1 is connected to the input voltage source VIN, for example, via a fuse, a second end of the boost energy storage inductor L1 is connected to the drain of the switching tube Q1 and the anode of the freewheeling diode D1, the cathode of the freewheeling diode D1 is connected to the first end of the capacitor C3 and to the parallel multi-LED load circuit, a first end of the resistor R5 is connected to the source of the switching tube Q1, the GATE of the switching tube Q1 is connected to the GATE driving GATE pin of the external switching tube of the control chip U1, and the second end of the capacitor C3 and the second end of the resistor R5 are connected to ground. Here, the freewheeling diode D1 may serve as an isolation function, and the capacitor C3 may be an electrolytic capacitor, which mainly serves as an energy storage and filtering function, so that the pulsating output voltage becomes a stable dc voltage.
The dimming control module in the control chip U1 may be used to generate dimming control signals for the multi-channel current control module based on the external dimming signal. As described above, depending on the LPF pin connection state of the control chip U1, the dimming control module may generate the dimming control signal directly based on the external dimming signal (e.g., PWM signal), or based on the analog dimming signal converted from the external dimming signal.
The multi-channel current control module in the control chip U1 can be connected to the multiple LED load circuits in parallel to control the constant current output values of the multiple LED load circuits simultaneously based on the dimming control signal from the dimming control module. Here, the current output value of the LED load circuit can be adjusted by the dimming control signal on one hand, and can also be controlled by the current value sampled by the ISET pin on the other hand.
As described above, according to the embodiment of the present invention, the multi-channel current control module is integrated in the control chip U1, and the parallel multi-channel LED load circuits can be connected simultaneously, so as to realize simultaneous on-off control and brightness adjustment of the parallel multi-channel LED load circuits.
In addition, as shown in fig. 1, the multichannel LED constant current boost driving circuit system according to the embodiment of the present invention may further include an overvoltage protection circuit 120, which includes a first voltage dividing resistor Rd1 and a second voltage dividing resistor Rd2, wherein a first end of the first voltage dividing resistor Rd1 is connected to a first end of the capacitor C3, a second end of the first voltage dividing resistor Rd1 is connected to a first end of the second voltage dividing resistor Rd2 and an overvoltage protection OVP pin of the control chip U1, and a second end of the second voltage dividing resistor Rd2 is connected to ground. Here, it should be understood that although fig. 1 shows that the overvoltage protection circuit 120 may include two series-connected voltage dividing resistors (Rd1 and Rd2), in other embodiments, the overvoltage protection circuit 120 may include any suitable number of series-connected voltage dividing resistors, and the overvoltage protection pin OVP of the control chip U1 may be connected to a common terminal of two adjacent voltage dividing resistors as needed.
The specific structure examples of the multichannel LED constant current boost driving circuit system and the control chip thereof according to the embodiments of the present invention are described in detail above with reference to the accompanying drawings. For traditional single channel LED constant current drive circuit system that steps up, the utility model provides a high efficiency, high integrated multichannel LED constant current drive circuit system that steps up, this system can utilize single control chip to realize carrying out on-off control and adjustting of the lighteness simultaneously to parallelly connected multichannel LED load circuit, and this is favorable to simplifying the line connection in the drive circuit system, reduces printed circuit board size.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (10)
1. A control chip for a multi-channel LED constant-current boosting driving circuit system comprises a control logic module, a dimming control module and a multi-channel current control module, wherein:
the control logic module is used for controlling a direct current-to-direct current (DC-DC) constant current boost switch circuit in the multi-channel LED constant current boost driving circuit system, and the DC-DC constant current boost switch circuit is connected with a plurality of parallel LED load circuits so as to control the constant current boost switch of the plurality of LED load circuits;
the dimming control module is used for generating a dimming control signal for the multi-channel current control module based on an external dimming signal; and is
The multi-channel current control module is connected with the multi-channel LED load circuits to simultaneously control constant current output values of the multi-channel LED load circuits based on the dimming control signals from the dimming control module.
2. The control chip according to claim 1, wherein the multi-channel current control module is connected to a current setting pin of the control chip, the current setting pin is connected to ground via a first resistor, wherein a resistance value of the first resistor is adjustable to set a maximum constant current output value of the multi-channel LED load circuit.
3. The control chip according to claim 1 or 2, wherein the dimming control module is connected with a dimming signal input pin of the control chip receiving the external dimming signal and is connected with a low pass filtering pin of the control chip; the dimming control module generates the dimming control signal based directly on the external dimming signal when the low pass filtering pin is suspended; and when the low-pass filtering pin is connected to the ground through the first capacitor, the dimming control module generates the dimming control signal based on an analog dimming signal converted from the external dimming signal.
4. The control chip according to claim 1 or 2, wherein the control logic module is connected to a loop compensation pin of the control chip for loop compensation, the loop compensation pin being connected to ground via a second resistor and a second capacitor.
5. The control chip according to claim 1 or 2, wherein the control logic module is connected with an overvoltage protection pin of the control chip to connect to an overvoltage protection circuit in the multi-channel LED constant-current boost driving circuit system.
6. The control chip according to claim 1 or 2, further comprising an oscillator and an operating frequency setting pin, one end of the oscillator being connected to the control logic module and the other end being connected to the operating frequency setting pin, the operating frequency setting pin being connected to ground via a third resistor, a resistance value of the third resistor being adjustable to set an operating frequency of the control chip.
7. The control chip of claim 1 or 2, further comprising:
the power supply input pin is connected with an input voltage source of the multi-channel LED constant-current boost driving circuit system and used for supplying power to the control chip;
the enable input pin is used for receiving an external control signal to control the on and off of the control chip;
the external switching tube grid driving pin is respectively connected to the control logic module in the control chip and the grid of the switching tube in the DC-DC constant current boost switching circuit so as to control the on and off of the switching tube; and
and the current sensing pin is connected to the control logic module in the control chip and is connected to the source electrode of the switching tube through a fourth resistor so as to sense the peak current flowing through a boosting energy storage inductor in the DC-DC constant-current boosting switching circuit.
8. A multi-channel LED constant-current boost driving circuit system for simultaneously driving a plurality of parallel LED load circuits, the system comprises a dimming signal source for providing an external dimming signal, a DC-DC constant-current boost switching circuit, and a control chip according to any one of claims 1 to 7.
9. The multi-channel LED constant-current boost driving circuit system according to claim 8, wherein the DC-DC constant-current boost switching circuit comprises a boost energy storage inductor, a diode, a switching tube, a third capacitor and a fifth resistor, a first end of the boost energy storage inductor is connected to an input voltage source, a second end of the boost energy storage inductor is connected to a drain of the switching tube and an anode of the diode, a cathode of the diode is connected to a first end of the third capacitor and to the parallel multi-channel LED load circuit, a first end of the fifth resistor is connected to a source of the switching tube, a gate of the switching tube is connected to an external switching tube gate driving pin of the control chip, and a second end of the third capacitor and a second end of the fifth resistor are connected to ground.
10. The multi-channel LED constant-current boost driving circuit system according to claim 9, further comprising an overvoltage protection circuit, wherein the overvoltage protection circuit comprises a first voltage-dividing resistor and a second voltage-dividing resistor, wherein a first end of the first voltage-dividing resistor is connected to a first end of the third capacitor, a second end of the first voltage-dividing resistor is connected to a first end of the second voltage-dividing resistor and an overvoltage protection pin of the control chip, and a second end of the second voltage-dividing resistor is connected to ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020944443.7U CN212519506U (en) | 2020-05-29 | 2020-05-29 | Multi-channel LED constant-current boosting driving circuit system and control chip thereof |
| TW109208304U TWM601946U (en) | 2020-05-29 | 2020-06-30 | Multi-channel LED constant current boost drive circuit system and control chip thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020944443.7U CN212519506U (en) | 2020-05-29 | 2020-05-29 | Multi-channel LED constant-current boosting driving circuit system and control chip thereof |
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| CN212519506U true CN212519506U (en) | 2021-02-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114245522A (en) * | 2021-12-23 | 2022-03-25 | 芜湖雄狮汽车科技有限公司 | Multifunctional microcontroller and vehicle |
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2020
- 2020-05-29 CN CN202020944443.7U patent/CN212519506U/en active Active
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114245522A (en) * | 2021-12-23 | 2022-03-25 | 芜湖雄狮汽车科技有限公司 | Multifunctional microcontroller and vehicle |
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| TWM601946U (en) | 2020-09-21 |
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