CN210694428U - LED driving chip and LED driving system - Google Patents
LED driving chip and LED driving system Download PDFInfo
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- CN210694428U CN210694428U CN201921184699.6U CN201921184699U CN210694428U CN 210694428 U CN210694428 U CN 210694428U CN 201921184699 U CN201921184699 U CN 201921184699U CN 210694428 U CN210694428 U CN 210694428U
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Abstract
The utility model relates to a LED driver chip and LED actuating system, include: the input switch detection circuit detects the state of the input switch according to the power-on state of the power supply pin and outputs a detection signal; the logic control circuit receives and outputs enable signals according to the detection signals and a preset logic sequence; the constant current control circuit receives and outputs a driving signal according to the enabling signal so as to control the working state of the LED connected with the constant current control circuit; the role configuration pin is used for carrying out role configuration on the LED driving chip according to an external configuration circuit; the preset logic sequence comprises a first logic sequence and a second logic sequence, and when the LED driving chip is configured as a first role chip, the logic control circuit outputs an enable signal according to the first logic sequence; when the LED driving chip is configured as a second role chip, the logic control circuit outputs the enable signals according to a second logic sequence. The LED driving chip can simplify the circuit structure for adjusting the color temperature of the LED, reduce the cost of the driving power supply and reduce the volume.
Description
Technical Field
The utility model relates to a technical field of LED illumination, more specifically say, relate to a LED driver chip and LED actuating system.
Background
With the continuous expansion of the application range of LED illumination, the LED illumination is gradually developed from the single illumination function to the direction of intellectualization, humanization and energy conservation. In order to meet the requirements of people on light under different scenes, the LED lighting lamp with the function of adjusting the color temperature by switching is produced.
In the existing color temperature adjusting scheme, when two kinds of lamp beads are all lighted, because the driving current is fixed and unchanged, in the state, the current flowing through the two kinds of lamp beads is half of the full load current, namely, the brightness is only half of the brightness in a single color. In order to utilize the LED lamp beads to the maximum, the output power of the driving power supply needs to be doubled during color mixing. At present, a popular method is to control two independent LED driving power supplies by using a switch detection circuit, namely, a dual constant current power supply system. When the color is mixed, the two driving power supplies are simultaneously started, and the LED lamp beads connected with each power supply are all lighted at full power, so that the doubling of brightness of the mixed color is realized. Although this kind of scheme can make full use of LED lamp pearl, circuit structure is too complicated, causes power PCB area too big, and the cost is too high.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, provide a LED driver chip and LED actuating system.
The utility model provides a technical scheme that its technical problem adopted is: provided is an LED driving chip including:
the input switch detection circuit detects the state of an input switch according to the power-on state of a power supply pin and outputs a detection signal;
the logic control circuit is connected with the input switch detection circuit, receives the detection signal and outputs an enable signal according to the detection signal and a preset logic sequence;
the constant current control circuit is connected with the logic control circuit, receives the enabling signal and outputs a driving signal according to the enabling signal so as to control the working state of the LED connected with the constant current control circuit; and the number of the first and second groups,
a role configuration pin for performing role configuration on the LED driving chip according to an external configuration circuit;
the preset logic sequence comprises a first logic sequence and a second logic sequence, and when the LED driving chip is configured as a first role chip, the logic control circuit outputs the enabling signal according to the first logic sequence; and when the LED driving chip is configured as a second role chip, the logic control circuit outputs the enabling signals according to the second logic sequence.
In one embodiment, further comprising: and the synchronous control pin is used for sending or receiving a synchronous signal, and the first role chip and the second role chip which are interconnected through the synchronous control pin synchronously output the enabling signal so as to synchronously drive the LEDs respectively connected with the first role chip and the second role chip.
In one embodiment, the logic control circuit comprises:
the role configuration module is used for carrying out role identification according to an identification signal from the external configuration circuit on the role configuration pin so as to output a first configuration signal, a second configuration signal and a third configuration signal, wherein the first configuration signal, the second configuration signal and the third configuration signal are used for controlling a logic sequence, and the third configuration signal is used for setting an overvoltage protection point of the constant current control circuit;
the synchronous control module is connected with the role configuration module and used for generating and outputting a pulse trigger signal for state change according to the detection signal and the first configuration signal;
and the state control module is respectively connected with the role configuration module and the synchronous control module and is used for outputting the enabling signals in a first logic sequence or a second logic sequence according to the pulse trigger signal, the first configuration signal and the second configuration signal.
In one embodiment, the role configuration module comprises:
a first configuration signal and second configuration signal generating circuit connected to the role configuration pin for generating the first configuration signal and the second configuration signal;
and a third configuration signal generating circuit connected to the role configuration pin and used for generating the third configuration signal.
In one embodiment, the first and second configuration signal generating circuits comprise: the current source, the first comparator, the first NOT gate and the second NOT gate; the third configuration signal generation circuit includes: outputting a regulating circuit with the same overvoltage protection point under different role configurations;
the output end of the current source is connected with the role configuration pin, the anode of the first comparator is connected with the role configuration pin, the cathode of the first comparator is connected with a second reference potential, and the output pole of the first comparator is sequentially connected with the first NOT gate and the second NOT gate; wherein the first not gate outputs the first configuration signal and the second not gate outputs the second configuration signal;
the adjusting circuit is connected to the role configuration pin.
In one embodiment, the synchronization control module comprises: the device comprises a pull-up current source, a signal processing circuit, a pull-down circuit and an output circuit;
the signal processing circuit is respectively connected with the input switch detection circuit, the role configuration module and the control end of the pull-down circuit, the first end of the pull-down circuit is connected with the synchronous control pin, the output end of the pull-up current source and the input end of the output circuit, the second end of the pull-down circuit is grounded, and the output end of the output circuit is connected with the state control module.
In one embodiment, the signal processing circuit includes: a first NAND gate and a fourth NOT gate, the pull-down circuit comprising: MOS pipe, output circuit includes: a third not gate;
a first input end of the first nand gate is connected with the input switch detection circuit to access the detection signal, a second input end of the first nand gate is connected with the role configuration module to access the first configuration signal, and an output end of the first nand gate is connected with an input end of the fourth nand gate; the output end of the fourth NOT gate is connected with the grid electrode of the MOS tube, the source electrode of the MOS tube is grounded, and the drain electrode of the MOS tube is connected with the synchronous control pin;
the input end of the third not gate is connected with the synchronous control pin, and the output end of the third not gate is connected with the state control module;
the grid of the MOS tube is the control end of the pull-down circuit, the source of the MOS tube is the second end of the pull-down circuit, and the drain of the MOS tube is the first end of the pull-down circuit.
In one embodiment, the state control module comprises: a pulse generating circuit, a state storage unit and a decoding circuit;
the pulse generating circuit is connected with the synchronous control module to receive the pulse trigger signal and output a pulse signal;
the state storage unit is connected with the pulse generating circuit to receive the pulse signal and the state signal and output the state signal according to the pulse signal;
the decoding circuit is connected with the state storage unit and the role configuration module to receive the state signal and the first configuration signal and the second configuration signal, and decodes the state signal according to the first configuration signal and the second configuration signal to output the enable signal.
In one embodiment, the input switch detection circuit includes: a voltage divider circuit and a second comparator;
the input end of the voltage division circuit is connected with the power supply pin, the output end of the voltage division circuit is connected with the anode of the second comparator, the cathode of the second comparator is connected with the first reference potential, and the output electrode of the second comparator outputs the detection signal.
The utility model also provides a LED driving system, include: at least two LED driving chips as described above;
the at least two LED driving chips are respectively used for driving color temperature LEDs which are correspondingly connected with the at least two LED driving chips, and the at least two LED driving chips are connected through synchronous control pins.
In one embodiment, the at least two LED driving chips include: a first chip and a second chip; further comprising: the circuit comprises a first configuration circuit, a first driving circuit, a second configuration circuit and a second driving circuit;
the role configuration pin of the first chip is grounded through a first configuration circuit, the driving signal output pin of the first chip is connected with the first driving circuit, and the first driving circuit is connected with a color temperature LED which is correspondingly arranged on the first chip;
the role configuration pin of the second chip is grounded through a second configuration circuit, the driving signal output pin of the second chip is connected with the second driving circuit, and the second driving circuit is connected with the color temperature LED correspondingly arranged on the second chip;
when the first chip and the second chip are respectively determined as a first role chip and a second role chip, the first role chip detects the state of an input switch and synchronously controls the second role chip through the synchronous control pin.
In one embodiment, further comprising: a rectification circuit and a high-voltage capacitor;
the input end of the rectifying circuit is connected with the input switch, the output end of the rectifying circuit is connected with the first end of the high-voltage capacitor, and the second end of the high-voltage capacitor is grounded; and the power supply pin of the first chip and the power supply pin of the second chip are connected with the first end of the high-voltage capacitor.
In one embodiment, the resistance value of the first configuration circuit is different from the resistance value of the second configuration circuit.
In one embodiment, a ratio of the resistance value of the first configuration circuit to the resistance value of the second configuration circuit is n, where n is 2, 3, 4, … …, 8.
Implement the utility model discloses a LED driver chip has following beneficial effect: the method comprises the following steps: the input switch detection circuit detects the state of the input switch according to the power-on state of the power supply pin and outputs a detection signal; the logic control circuit receives and outputs enable signals according to the detection signals and a preset logic sequence; the constant current control circuit receives and outputs a driving signal according to the enabling signal so as to control the working state of the LED connected with the constant current control circuit; the role configuration pin is used for carrying out role configuration on the LED driving chip according to an external configuration circuit; the preset logic sequence comprises a first logic sequence and a second logic sequence, and when the LED driving chip is configured as a first role chip, the logic control circuit outputs an enable signal according to the first logic sequence; when the LED driving chip is configured as a second role chip, the logic control circuit outputs the enable signals according to a second logic sequence. The LED driving chip can simplify the circuit structure for adjusting the color temperature of the LED, reduce the cost of the driving power supply and reduce the volume.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a logic block diagram of an LED driving chip provided in an embodiment of the present invention;
fig. 2 is a logic block diagram of a logic control circuit provided in an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a role configuration module according to an embodiment of the present invention;
fig. 4 is a schematic circuit diagram of a synchronous control module according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a state control module according to an embodiment of the present invention;
fig. 6 is a schematic circuit diagram of an input switch detection circuit according to an embodiment of the present invention;
fig. 7 is a schematic circuit diagram of an LED driving system according to an embodiment of the present invention;
fig. 8 is a waveform diagram of a logic sequence provided by an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
In order to solve the problem that current LED colour temperature regulating circuit exists, the utility model provides a LED driver chip, this LED driver chip can automated inspection input switch's state to produce corresponding enable signal and correspond the operating condition who sets up rather than with the drive based on input switch's state, in order to reach the circuit structure who simplifies LED colour temperature and adjust, reduce drive power supply's cost and the purpose that reduces the volume.
Specifically, as shown in fig. 1, the LED driving chip 300 includes: the input switch detection circuit 301, the input switch detection circuit 301 detects the state of the input switch according to the power-on state of the power supply pin HV, and outputs a detection signal; the logic control circuit 303, the logic control circuit 303 is connected with the input switch detection circuit 301, receives and outputs the enable signal according to the detection signal and the preset logic sequence; the constant current control circuit 302 is connected with the logic control circuit 303, receives the enable signal and outputs a drive signal according to the enable signal so as to control the working state of the LED connected with the constant current control circuit 302; and a role configuration pin OVP for performing role configuration on the LED driving chip 300 according to an external configuration circuit.
In the embodiment of the present invention, when the predetermined logic sequence includes a first logic sequence and a second logic sequence and the LED driving chip 300 is configured as a first role chip, the logic control circuit 303 outputs the enable signal according to the first logic sequence; when the LED driving chip 300 is configured as a second role chip, the logic control circuit 303 outputs the enable signals according to a second logic sequence. It can be understood that the LED driving chip 300 of the embodiment of the present invention can be controlled by the control according to the external device or the control circuit to realize the color temperature adjustment control of the LED, and can also be controlled by the adjustment control according to itself to realize the color temperature adjustment control of the LED. Wherein, the control mode according to external equipment or control circuit can adopt current control mode, the utility model discloses do not do specifically and restrict.
Further, the LED driving chip 300 of the embodiment of the present invention further includes: a synchronization control pin CTL for transmitting or receiving a synchronization signal. Specifically, by setting the synchronous control pin CTL, the first role chip and the second role chip interconnected by the synchronous control pin CTL can synchronously output the enable signal, so as to synchronously drive the LEDs respectively connected to the first role chip and the second role chip. It should be noted that, through the synchronous control pin CTL, the first role chip can output the enable signals according to the first logic sequence, and the second role chip can output the enable signals according to the second logic sequence. Wherein the first logic order and the second logic order are different. Through the synchronous control pin CTL, synchronous control between the LED driving chips 300 can be realized.
Further, in one embodiment, as shown in fig. 2, the logic control circuit 303 may include: a role configuration module 502, a synchronization control module 501, and a state control module 503.
The role configuration module 502 is configured to perform role identification according to an identification signal from an external configuration circuit on the role configuration pin OVP, so as to output a first configuration signal sl1, a second configuration signal sl2 for controlling a logic sequence, and a third configuration signal OVP _ out for setting an overvoltage protection point of the constant current control circuit 302 according to an identification result. The embodiment of the utility model provides an in, first configuration signal sl1 and second configuration signal sl2 are different signals, and further, second configuration signal sl2 is the signal after first configuration signal sl1 processes through not gate circuit, and its phase place is opposite with first configuration signal sl1 phase place, and when first configuration signal sl1 was the high level signal, second configuration signal sl2 was the low level signal, and on the contrary, when first configuration signal sl1 was the low level signal, second configuration signal sl2 was the high level signal.
In a particular embodiment, as shown in fig. 3, the role configuration module 502 can include: a first configuration signal and second configuration signal generating circuit connected to the role configuration pin OVP for generating a first configuration signal sl1 and a second configuration signal sl 2; and a third configuration signal generating circuit connected to the role configuration pin OVP for generating a third configuration signal OVP _ out.
Wherein the first configuration signal and the second configuration signal generating circuit may include: a current source 700, a first comparator 701, a first not gate 702, and a second not gate 703.
The output end of the current source 700 is connected with a role configuration pin OVP, the anode of the first comparator 701 is connected with the role configuration pin OVP, the cathode of the first comparator 701 is connected with a second reference potential, and the output pole of the first comparator 701 is sequentially connected with a first NOT gate 702 and a second NOT gate 703; the first not gate 702 outputs a first configuration signal sl1, and the second not gate 703 outputs a second configuration signal sl 2.
The third configuration signal generating circuit includes: and outputting a regulating circuit with the same overvoltage protection point under different role configurations, wherein the regulating circuit is connected to a role configuration pin OVP. It can be understood that, as shown in fig. 3, 704 in fig. 3 may be configured to divide the accessed signal by n and output the divided signal to 707, where 707 is a transmission gate, when 707 is turned on, the signal of 704 may be output to the constant current control circuit 302, and when 707 is turned off, the signal of 704 may not be output; further, 705 in fig. 3 is to perform a division operation on the accessed signal, and transmit the divided signal to the output end of the third configuration signal generation circuit of the role configuration module 502 through the transmission gate 706, where the signal of 705 can be output when the transmission gate 706 is turned on, and the signal of 705 cannot be output when the transmission gate 706 is turned off. It should be noted that 704 to 707 in fig. 3 are merely schematic symbols and do not represent specific circuits or devices.
As shown in fig. 3, the role configuration module 502 is provided with a current source 700 inside, the current of the current source 700 flows out from the role configuration pin OVP and flows through the external configuration circuit (in this embodiment, the external configuration circuit can be realized by an OVP resistor 708), and the voltage (OVP voltage) generated by the external configuration circuit is compared with the internal reference voltage (the second reference potential Ref2) through the first comparator 701. When the OVP voltage is greater than the voltage of the second reference potential, the first comparator 701 outputs a high level, and at this time, the first configuration signal sl1 is at a low level and the second configuration signal sl2 is at a high level. When the OVP voltage is less than the voltage of the second reference potential, the first comparator 701 outputs a low level, and at this time, the first configuration signal sl1 is at a high level, and the second configuration signal sl2 is at a low level. The LED driving chip 300 determines its role by the size of the OVP resistor 708, i.e., whether it is a first role chip or a second role chip. In one embodiment, the LED driving chip 300 is determined as a first role chip when the OVP resistor 708 is small, and the LED driving chip 300 is determined as a second role chip when the OVP resistor 708 is smaller than the external resistance of the chip interconnected with the LED driving chip 300.
Further, since the roles of the LED driver chips 300 are determined by the size of the OVP resistor 708, it is inevitable that the external resistors of the two LED driver chips 300 are different, and the external resistors of the two LED driver chips 300 are used for setting the overvoltage protection point, so that, in order to keep the OVP voltages of the two LED driver chips 300 the same, it is necessary to perform a 1/n operation on the OVP voltage of the second role chip, that is, after the OVP voltage of the second role chip is reduced to 1/n, the OVP voltage is input to the constant current control circuit 302, so that the third configuration signals OVP _ out connected to the constant current control circuit 302 in the first role chip and the second role chip are the same, and the OVP points of the first role chip and the second role chip are the same.
The embodiment of the present invention provides an embodiment, the synchronous control module 501, which is connected to the role configuration module 502, is used for generating and outputting the pulse trigger signal CTLb for state change according to the detection signal and the first configuration signal sl 1.
Further, the synchronization control module 501 includes: a pull-up current source 600, a signal processing circuit, a pull-down circuit, and an output circuit.
The signal processing circuit is connected to the input switch detection circuit 301, the role configuration module 502, and the control end of the pull-down circuit, the first end of the pull-down circuit is connected to the synchronous control pin CTL, the output end of the pull-up current source 600, and the input end of the output circuit, the second end of the pull-down circuit is grounded, and the output end of the output circuit is connected to the state control module 503. The embodiment of the utility model provides an in, signal processing circuit is used for handling the detecting signal of input switch detecting circuit 301 output and the first configuration signal sl1 of role configuration module 502 output to input corresponding control signal control pull-down circuit switch on or turn-off, wherein, when this LED driver chip 300 is configured as first role chip, pull-down circuit switches on, when this LED driver chip 300 is configured as the second role chip, pull-down circuit switches off (disconnection). The output circuit is used for outputting a pulse trigger signal CTLb after processing the synchronous signal.
As shown in fig. 4, in one embodiment, the signal processing circuit includes: a first nand gate 604 and a fourth not gate 603, the pull-down circuit comprising: MOS pipe 602, output circuit includes: a third not gate 601.
A first input end of the first nand gate 604 is connected to the input switch detection circuit 301 for receiving the detection signal, a second input end of the first nand gate 604 is connected to the role configuration module 502 for receiving the first configuration signal sl1, and an output end of the first nand gate 604 is connected to an input end of the fourth not gate 603; the output end of the fourth not gate 603 is connected with the gate of the MOS transistor 602, the source of the MOS transistor 602 is grounded, and the drain of the MOS transistor 602 is connected with the synchronous control pin CTL; the input terminal of the third not-gate 601 is connected to the synchronous control pin CTL, and the output terminal of the third not-gate 601 is connected to the state control module 503. The gate of the MOS 602 is a control terminal of the pull-down circuit, the source of the MOS 602 is a second terminal of the pull-down circuit, and the drain of the MOS 602 is a first terminal of the pull-down circuit.
As shown in fig. 4, when the LED driver chip 300 is configured as a first role chip, the first configuration signal sl1 coupled to the first nand gate 604 is at a high level, and the MOS transistor 602 is controlled by the detection signal output by the input switch detection circuit 301. When the LED driving chip 300 is configured as a second role chip, the first configuration signal sl1 connected to the first nand gate 604 is at a low level, and at this time, the gate of the MOS 602 is at a low level, and the MOS 602 is in an off state, so that the synchronization signal can only be controlled by the first role chip, and the second role chip cannot control the synchronization signal.
In fig. 4, the signal processing circuit is implemented by a nand gate and a not gate, but it is understood that in other embodiments, the signal processing circuit can be implemented by a nand gate directly, and is not limited to the circuit structure shown in fig. 4.
The embodiment of the present invention provides a state control module 503, which is connected to the role configuration module 502 and the synchronization control module 501 respectively, and is used for outputting the enable signal according to the pulse trigger signal CTLb, the first configuration signal sl1 and the second configuration signal sl2 in the first logic order or the second logic order.
Further, the state control module 503 may include: pulse generation circuit 800, state storage unit, and decoding circuit.
The pulse generating circuit 800 is connected to the synchronous control module 501 to receive the pulse trigger signal CTLb and output a pulse signal.
The state storage unit is connected to the pulse generating circuit 800 to receive the pulse signal and the state signal and output the state signal according to the pulse signal. Wherein, the utility model discloses state memory cell can be realized by the D flip-flop.
In one embodiment, as shown in fig. 5, the state storage unit may include: a first D flip-flop 801 and a second D flip-flop 802. In fig. 5, enp is a power-on reset signal inside the driver chip, st1 is a first state signal, and st2 is a second state signal.
The decoding circuit is connected to the state storage unit and character configuration block 502 to receive the state signal and the first and second configuration signals sl1 and sl2, and to decode the state signal according to the first and second configuration signals sl1 and sl2 to output an enable signal.
The embodiment of the utility model provides an in, this decoding circuit can be realized through some logic gates.
In one embodiment, as shown in fig. 5, the decoding circuit may include: a nor gate 805, a fifth not gate 806, a second nand gate 807, a third nand gate 808, a fourth nand gate 809, a sixth not gate 810, a seventh not gate 811, a fifth nand gate 812, and an eighth not gate 813.
Wherein, the first input end of the nor gate 805 is connected with the output end of the first D flip-flop 801 to access the first state signal, the second input end of the nor gate 805 is connected with the output end of the second D flip-flop 802 to access the second state signal, the output end of the nor gate 805 is connected with the input end of the fifth not gate 806, the output end of the fifth not gate 806 is connected with the first input end of the second nand gate 807, the second input end of the second nand gate 807 is connected with the first configuration signal sl1, the output end of the second nand gate 807 is connected with the first input end of the third nand gate 808, the second input end of the third nand gate 808 is connected with the output end of the fifth nand gate 812, the output end of the third nand gate 808 is connected with the first input end of the fourth nand gate 809, the second input end of the fourth nand gate 809 is connected with the output end of the eighth not gate 813, the output end of the fourth nand gate 809 is connected with the input end of, the output terminal of the sixth not gate 810 is connected to the enable signal input terminal of the constant current control circuit 302. A first input end of the fifth nand gate 812 is connected to the second configuration signal sl2, a second input end of the fifth nand gate 812 is connected to an output end of the seventh not gate 811, and an input end of the seventh not gate 811 is connected to the first state signal; the input terminal of the eighth not gate 813 is connected to the detection signal. IN fig. 5, the detection signal (shown as IN fig. 5) is inputted to the input terminal of the eighth circuit 813, and the IN is the detection signal hv _ on outputted by the input switch detection circuit 301.
The embodiment of the utility model provides an in, input switch detection circuitry 301 includes: a voltage divider circuit and a second comparator 402.
The input end of the voltage divider circuit is connected to the power supply pin HV, the output end of the voltage divider circuit is connected to the anode of the second comparator 402, the cathode of the second comparator 402 is connected to the first reference potential (Ref1), and the output electrode of the second comparator 402 outputs a detection signal.
In one embodiment, as shown in fig. 6, the voltage dividing circuit may include: a first voltage dividing resistor 400 and a second voltage dividing resistor 401. The logic circuit 403 may include: a not gate. The first end of the first voltage-dividing resistor 400 is used as the input end of the voltage-dividing circuit and connected to the power supply pin HV, the second end of the first voltage-dividing resistor 400 is connected to the first end of the second voltage-dividing resistor 401, the connection end of the second end of the first voltage-dividing resistor 400 and the first end of the second voltage-dividing resistor 401 is used as the output end of the voltage-dividing circuit and connected to the anode of the second comparator 402, and the second end of the second voltage-dividing resistor 401 is grounded.
Further, the first voltage divider resistor 400 and the second voltage divider resistor 401 of the embodiment of the present invention and other devices in the LED driving chip 300 can be disposed on a wafer. Thereby effectively reducing the occupied area of the PCB.
Further, the utility model also provides a LED actuating system, this LED actuating system include two at least LED driver chip, wherein, these two at least LED driver chip do the utility model discloses the LED driver chip that the embodiment discloses.
Specifically, the at least two LED driving chips are respectively used for driving color temperature LEDs respectively connected to the at least two LED driving chips, and the at least two LED driving chips are connected through a synchronous control pin CTL.
In one embodiment, as shown in fig. 7, the at least two LED driving chips include: a first chip 206 and a second chip 207; further comprising: a first configuration circuit 208, a first driver circuit, a second configuration circuit 209, and a second driver circuit. Wherein the first chip 206, the first configuration circuit 208, and the first driving circuit form the first driving source 204; the second chip 207, the second configuration circuit 209, the second drive circuit form a second drive source 205.
The role configuration pin OVP of the first chip 206 is grounded through the first configuration circuit 208, and the driving signal output pin (Drv) of the first chip 206 is connected to a first driving circuit, which is connected to the color temperature LED disposed corresponding to the first chip 206, that is, as shown in fig. 7, the color temperature LED disposed corresponding to the first chip 206 is a first color temperature LED lamp set 210.
The role configuration pin OVP of the second chip 207 is grounded through the second configuration circuit 209, and the driving signal output pin (Drv) of the second chip 207 is connected to a second driving circuit, which is connected to the color temperature LED correspondingly disposed on the second chip 207, that is, as shown in fig. 7, the color temperature LED correspondingly disposed on the second chip 207 is the second color temperature LED lamp set 211.
When the first chip 206 and the second chip 207 are respectively determined as a first role chip and a second role chip, the first role chip detects the state of the input switch 201 and synchronously controls the second role chip through the synchronous control pin CTL.
Further, as shown in fig. 7, the first driving circuit and the second driving circuit can be realized by driving tubes, resistors, capacitors and related components, and the present invention is not limited in particular.
Further, as shown in fig. 7, the LED driving system further includes: a rectifier circuit 202 and a high voltage capacitor 203. The rectifier circuit 202 may be implemented by an existing rectifier circuit, such as a bridge rectifier circuit.
The input end of the rectifying circuit 202 is connected with the input switch, the output end of the rectifying circuit 202 is connected with the first end of the high-voltage capacitor 203, and the second end of the high-voltage capacitor 203 is grounded; the supply pin HV of the first chip 206 and the supply pin HV of the second chip 207 are connected to a first terminal of the high-voltage capacitor 203.
Further, in the embodiment of the present invention, the resistance of the first configuration circuit 208 is different from the resistance of the second configuration circuit 209.
Specifically, the ratio of the resistance of the first configuration circuit 208 to the resistance of the second configuration circuit 209 is n, where n is 2, 3, 4, … …, and 8. Of course, it is understood that the resistance ratio of the first configuration circuit 208 to the second configuration circuit 209 is not limited to 2, 3, 4, … …, 8, and may be determined according to the requirements of the circuit or the device in practical applications.
Further, the first configuration circuit 208 and the second configuration circuit 209 may be implemented by resistors, wherein the resistance of the resistor of the first configuration circuit 208 is different from the resistance of the resistor of the second configuration circuit 209.
Further, as shown in fig. 7, 200 is an ac source, and when the input switch 201 is closed, the electric energy of the ac source 200 flows into the rectifier circuit 202, is rectified by the rectifier circuit 202, and then is sent to the high-voltage capacitor 203 to charge the high-voltage capacitor 203.
As shown in fig. 7, the LED driving system is composed of a first driving source 204 and a second driving source 205, wherein a first role chip 206 and a second role chip 207 can automatically determine the first role chip and the second role chip according to the difference between a first configuration circuit 208 and a second configuration circuit 209, wherein the first role chip is used for controlling the action of the whole system, the action consistency of the first role chip and the second role chip is ensured, and the logic sequence of the first role chip is different from the logic sequence of the second role chip. It should be noted that the first chip 206 and the second chip 207 may be the same chip, and are connected to each other through respective synchronization control pins CTL, where the first role chip controls the second role chip through the synchronization control pins CTL.
As shown in fig. 7, during power-up, the first chip 206 and the second chip 207 respectively detect their respective OVP resistors (i.e., the resistors of the first configuration circuit 208 and the second configuration circuit 209), and configure their respective roles according to the magnitudes of their respective OVP resistors, where a chip with a small resistance is a first role chip, and a chip with a large resistance is a second role chip, and in a specific implementation, the configuration may be reversed. And after the role configuration is finished, the first role chip outputs the enable signals according to the first logic sequence, and the second role chip outputs the enable signals according to the second logic sequence. The waveform of the enable signal output by the first role chip according to the first logic sequence is shown as 905 in fig. 8, and the waveform of the enable signal output by the second role chip according to the second logic sequence is shown as 906 in fig. 8.
As shown in fig. 8, when the high-voltage capacitor 203 is powered on, the first role chip is operated, and the second role chip is not operated; when the input switch 201 is switched on and off once (the high-voltage capacitor 203 is powered on for the second time), the first role chip does not work, and the second role chip works; when the input switch 201 is switched once again (the high-voltage capacitor 203 is powered up for the third time), both the first role chip and the second role chip operate. According to the first logic sequence and the second logic sequence, in the system shown in fig. 2, the first chip 206 is set as a first role chip, the second chip 207 is set as a second role chip, the first color temperature LED lamp set 210 corresponding to the first chip 206 is white light, and the second color temperature LED lamp set 211 corresponding to the second chip 207 is warm light, so that the white light is turned on when the first power is on, the warm light is turned on when the second power is on, and the white light and the bright light are simultaneously turned on when the third power is on, thereby realizing the function of switching color temperatures.
Further, as shown in fig. 6, the detection signal input to the output of the switch detection circuit 301 is hv _ on. As shown in fig. 7, when the input switch 201 is closed, the voltage of the high-voltage capacitor 203 rises, and when the divided voltage of the first voltage-dividing resistor 400 and the second voltage-dividing resistor 401 is smaller than the voltage of the first reference potential Ref1, the second comparator 402 outputs a high level, that is, when the output detection signal hv _ on is a high level, the detection signal hv _ on is a high level, which represents that the input switch 201 is closed, and vice versa, the input switch 201 is open.
Further, it is assumed that the first chip 206 is configured as a first role chip and the second chip 207 is configured as a second role chip. As shown in fig. 8, waveform 900 represents the state of input switch 201, and a high level represents that input switch 201 is closed and vice versa. Waveform 901 is the detection signal input to the output of the switch detection circuit 301, and waveforms 905 and 906 represent the logic sequence of the first role chip and the second role chip, respectively, that is, waveform 905 is the first logic sequence, waveform 906 is the second logic sequence, high level represents that the chip operates, and low level represents that the chip does not operate. The specific working principle is as follows:
when the input switch 201 is turned off for a period of time and then turned on again (or turned on for the first time), the first driving source 204 is operated, the second driving source 205 is not operated, and the first color temperature LED lamp group 210 is turned on, the second color temperature LED lamp group is not turned on, and the state at this time is defined as a first state; when the input switch 201 is turned off and is turned on again in a short time, the first driving source 204 does not work, the second driving source 205 works, the first color temperature LED lamp set 210 is not lighted, the second color temperature LED lamp set is lighted, and the state at this time is defined as a second state; when the input switch 201 is turned off again and is re-closed in a short time, the first driving source 204 and the second driving source 205 are operated simultaneously, and the first color temperature LED lamp group 210 and the second color temperature LED lamp group are simultaneously turned on, and the state at this time is defined as a third state; if the input switch 201 is opened and closed again, the first driving source 204 and the second driving source 205 are returned to the first state again.
As shown in fig. 7, the first chip 206 and the second chip 207 determine their roles by detecting the resistance of the first configuration circuit 208 and the resistance of the second configuration circuit 209, and when the resistance of the first configuration circuit 208 is small, the first chip 206 is configured as a first role chip, and when the resistance of the second configuration circuit 209 is n times the resistance of the first configuration circuit 208, the second chip 207 is configured as a second role chip.
Further, as shown IN fig. 4, when the first chip 206 or the second chip 207 is configured as a first role chip, the first configuration signal sl1 accessed by the synchronization control module 501 of the first chip 206 or the second chip 207 is at a high level, and the MOS 602 is controlled by the input signal IN; when the first chip 206 or the second chip 207 is configured as a second role chip, the first configuration signal sl1 accessed by the synchronization control module 501, which is configured as a second role chip, of the first chip 206 or the second chip 207 is at a low level, so that the gate of the MOS 602 is at a low level, and the MOS 602 is in an off state, so that the synchronization signal can only be controlled by the first role chip, and the second role chip cannot control the synchronization signal. As shown in fig. 8, the synchronization signal is the same as the detection signal accessed by the first role chip, and the high level of the synchronization signal represents that the input switch 201 is closed, whereas the high level of the synchronization signal represents that the input switch 201 is open.
Further, the state control module 503 performs state change control according to the pulse trigger signal (CTLb).
As shown in fig. 8, according to the waveform 905 and the waveform 906, when the input switch 201 is closed for the first time, the first role chip operates, and the second role chip does not operate; when the input switch 201 is turned off and turned on again, the first role chip does not work, and the second role chip works; when the input switch 201 is opened and closed again, the first role chip and the second role chip work simultaneously, so far, a cycle is completed, and if the input switch 201 is continuously opened and closed again, the first state is returned.
The above embodiments are only for illustrating the technical concept and features of the present invention, and the purpose of the embodiments is to enable people skilled in the art to understand the contents of the present invention and implement the present invention accordingly, which can not limit the protection scope of the present invention. All equivalent changes and modifications made within the scope of the claims of the present invention shall fall within the scope of the claims of the present invention.
It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.
Claims (14)
1. An LED driving chip, comprising:
the input switch detection circuit detects the state of an input switch according to the power-on state of a power supply pin and outputs a detection signal;
the logic control circuit is connected with the input switch detection circuit, receives the detection signal and outputs an enable signal according to the detection signal and a preset logic sequence;
the constant current control circuit is connected with the logic control circuit, receives the enabling signal and outputs a driving signal according to the enabling signal so as to control the working state of the LED connected with the constant current control circuit; and the number of the first and second groups,
a role configuration pin for performing role configuration on the LED driving chip according to an external configuration circuit;
the preset logic sequence comprises a first logic sequence and a second logic sequence, and when the LED driving chip is configured as a first role chip, the logic control circuit outputs the enabling signal according to the first logic sequence; and when the LED driving chip is configured as a second role chip, the logic control circuit outputs the enabling signals according to the second logic sequence.
2. The LED driving chip according to claim 1, further comprising: and the synchronous control pin is used for sending or receiving a synchronous signal, and the first role chip and the second role chip which are interconnected through the synchronous control pin synchronously output the enabling signal so as to synchronously drive the LEDs respectively connected with the first role chip and the second role chip.
3. The LED driving chip of claim 2, wherein the logic control circuit comprises:
the role configuration module is used for carrying out role identification according to an identification signal from the external configuration circuit on the role configuration pin so as to output a first configuration signal, a second configuration signal and a third configuration signal, wherein the first configuration signal, the second configuration signal and the third configuration signal are used for controlling a logic sequence, and the third configuration signal is used for setting an overvoltage protection point of the constant current control circuit;
the synchronous control module is connected with the role configuration module and used for generating and outputting a pulse trigger signal for state change according to the detection signal and the first configuration signal;
and the state control module is respectively connected with the role configuration module and the synchronous control module and is used for outputting the enabling signals in a first logic sequence or a second logic sequence according to the pulse trigger signal, the first configuration signal and the second configuration signal.
4. The LED driver chip according to claim 3, wherein the role configuration module comprises:
a first configuration signal and second configuration signal generating circuit connected to the role configuration pin for generating the first configuration signal and the second configuration signal;
and a third configuration signal generating circuit connected to the role configuration pin and used for generating the third configuration signal.
5. The LED driver chip of claim 4, wherein the first and second configuration signal generating circuits comprise: the current source, the first comparator, the first NOT gate and the second NOT gate; the third configuration signal generation circuit includes: outputting a regulating circuit with the same overvoltage protection point under different role configurations;
the output end of the current source is connected with the role configuration pin, the anode of the first comparator is connected with the role configuration pin, the cathode of the first comparator is connected with a second reference potential, and the output pole of the first comparator is sequentially connected with the first NOT gate and the second NOT gate; wherein the first not gate outputs the first configuration signal and the second not gate outputs the second configuration signal;
the adjusting circuit is connected to the role configuration pin.
6. The LED driving chip according to claim 3, wherein the synchronization control module comprises: the device comprises a pull-up current source, a signal processing circuit, a pull-down circuit and an output circuit;
the signal processing circuit is respectively connected with the input switch detection circuit, the role configuration module and the control end of the pull-down circuit, the first end of the pull-down circuit is connected with the synchronous control pin, the output end of the pull-up current source and the input end of the output circuit, the second end of the pull-down circuit is grounded, and the output end of the output circuit is connected with the state control module.
7. The LED driving chip according to claim 6, wherein the signal processing circuit comprises: a first NAND gate and a fourth NOT gate, the pull-down circuit comprising: MOS pipe, output circuit includes: a third not gate;
a first input end of the first nand gate is connected with the input switch detection circuit to access the detection signal, a second input end of the first nand gate is connected with the role configuration module to access the first configuration signal, and an output end of the first nand gate is connected with an input end of the fourth nand gate; the output end of the fourth NOT gate is connected with the grid electrode of the MOS tube, the source electrode of the MOS tube is grounded, and the drain electrode of the MOS tube is connected with the synchronous control pin;
the input end of the third not gate is connected with the synchronous control pin, and the output end of the third not gate is connected with the state control module;
the grid of the MOS tube is the control end of the pull-down circuit, the source of the MOS tube is the second end of the pull-down circuit, and the drain of the MOS tube is the first end of the pull-down circuit.
8. The LED driver chip according to claim 3, wherein the state control module comprises: a pulse generating circuit, a state storage unit and a decoding circuit;
the pulse generating circuit is connected with the synchronous control module to receive the pulse trigger signal and output a pulse signal;
the state storage unit is connected with the pulse generating circuit to receive the pulse signal and the state signal and output the state signal according to the pulse signal;
the decoding circuit is connected with the state storage unit and the role configuration module to receive the state signal and the first configuration signal and the second configuration signal, and decodes the state signal according to the first configuration signal and the second configuration signal to output the enable signal.
9. The LED driving chip according to claim 1 or 2, wherein the input switch detection circuit comprises: a voltage divider circuit and a second comparator;
the input end of the voltage division circuit is connected with the power supply pin, the output end of the voltage division circuit is connected with the anode of the second comparator, the cathode of the second comparator is connected with the first reference potential, and the output electrode of the second comparator outputs the detection signal.
10. An LED driving system, comprising: at least two LED driving chips according to any of claims 1-9;
the at least two LED driving chips are respectively used for driving color temperature LEDs which are correspondingly connected with the at least two LED driving chips, and the at least two LED driving chips are connected through synchronous control pins.
11. The LED driving system according to claim 10, wherein the at least two LED driving chips comprise: a first chip and a second chip; further comprising: the circuit comprises a first configuration circuit, a first driving circuit, a second configuration circuit and a second driving circuit;
the role configuration pin of the first chip is grounded through a first configuration circuit, the driving signal output pin of the first chip is connected with the first driving circuit, and the first driving circuit is connected with a color temperature LED which is correspondingly arranged on the first chip;
the role configuration pin of the second chip is grounded through a second configuration circuit, the driving signal output pin of the second chip is connected with the second driving circuit, and the second driving circuit is connected with the color temperature LED correspondingly arranged on the second chip;
when the first chip and the second chip are respectively determined as a first role chip and a second role chip, the first role chip detects the state of an input switch and synchronously controls the second role chip through the synchronous control pin.
12. The LED driving system according to claim 11, further comprising: a rectification circuit and a high-voltage capacitor;
the input end of the rectifying circuit is connected with the input switch, the output end of the rectifying circuit is connected with the first end of the high-voltage capacitor, and the second end of the high-voltage capacitor is grounded; and the power supply pin of the first chip and the power supply pin of the second chip are connected with the first end of the high-voltage capacitor.
13. The LED driving system according to claim 11, wherein the resistance of the first configuration circuit is different from the resistance of the second configuration circuit.
14. The LED driving system according to claim 11, wherein a ratio of the resistance of the first configuration circuit to the resistance of the second configuration circuit is n, where n is 2, 3, 4, … …, 8.
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Effective date of registration: 20210317 Address after: Building C, No.888, Huanhu West 2nd Road, Lingang New District, Pudong New Area pilot Free Trade Zone, Shanghai Patentee after: Shanghai Xinfei Semiconductor Technology Co.,Ltd. Address before: 518052 1701, 17th floor, tefa information technology building, Qiongyu Road, Yuehai street, Nanshan District, Shenzhen City, Guangdong Province Patentee before: SILICON DRIVER SEMICONDUCTOR Co.,Ltd. |