CN111565490B - Starting method, system, medium and equipment of boost chip for automobile LED signal lamp - Google Patents
Starting method, system, medium and equipment of boost chip for automobile LED signal lamp Download PDFInfo
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Abstract
The invention provides a starting method, a system, a medium and equipment of a boost chip for an automobile LED signal lamp, wherein the boost chip comprises a setting circuit of an over-voltage point, a hysteresis comparator circuit and a starting circuit; the starting method of the boosting chip for the automobile LED signal lamp comprises the following steps: after the boost chip is electrified, disconnecting the hysteresis comparator loop; updating the overvoltage point, and eliminating the overvoltage alarm state of the hysteresis comparator loop; restoring the hysteretic comparator loop; and judging whether the hysteresis comparator loop generates overvoltage alarm or not, and starting the boost chip when the overvoltage alarm does not occur. The invention solves the problem of locking the over-voltage alarm state of the hysteresis comparator in a software control mode, has simple realization mode and does not increase the material and labor cost.
Description
Technical Field
The invention belongs to the field of automotive LED signal lamp control, relates to a method for starting a boost chip for an LED signal lamp, and particularly relates to a method, a system, a medium and equipment for starting the boost chip for the automotive LED signal lamp.
Background
At present, many boost chips of chip companies are widely used in LED current driving modules due to their low price and high conversion efficiency. In automotive applications, there are high quiescent current requirements for individual modules due to limited battery capacity. We can reduce the quiescent current by increasing the output feedback resistance of the boost circuit. However, when the resistance of the feedback resistor exceeds a certain value, the hysteresis comparator inside the chip locks the overvoltage protection state, and cannot be released, so that the boost chip cannot work. In order to meet the requirement of quiescent current, the feedback resistor needs to reach a preset value, so that the dead lock state caused by the overvoltage protection state is more serious, and the boost chip cannot work.
Therefore, how to provide a simple and low-cost method for starting a boost chip to enable the boost chip to work normally has become a technical problem to be solved urgently by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, an object of the present invention is to provide a method, a system, a medium and a device for starting a boost chip for an automotive LED signal lamp, which are used to solve the problem that the prior art cannot solve the problem that the boost chip is locked due to an overvoltage alarm state and cannot be started normally.
In order to achieve the above and other related objects, the present invention provides a method for starting a boost chip for an automotive LED signal lamp, the boost chip includes a set circuit of an overvoltage point, a hysteresis comparator circuit, and a starting circuit, the set circuit of the overvoltage point is used for transmitting the set overvoltage point to the hysteresis comparator circuit; the hysteresis comparator loop is used for locking an overvoltage alarm state when the partial pressure of the output voltage is greater than the overvoltage point; the starting method of the boosting chip for the automobile LED signal lamp comprises the following steps: after the boost chip is electrified, disconnecting the hysteresis comparator loop; updating the overvoltage point, and eliminating the overvoltage alarm state of the hysteresis comparator loop; restoring the hysteretic comparator loop; and judging whether the hysteresis comparator loop generates overvoltage alarm or not, and starting the boost chip when the overvoltage alarm does not occur.
In an embodiment of the present invention, the hysteresis comparator circuit includes an alarm enable switch; after the boosting chip is powered on, the step of disconnecting the hysteresis comparator loop comprises the following steps: opening the alarm enable switch, thereby opening the hysteretic comparator loop.
In an embodiment of the present invention, the hysteresis comparator circuit further includes an input voltage terminal, a current source, a MOS transistor, and an overvoltage detection comparator; the input voltage end is connected with one end of the current source, the other end of the current source is connected with the drain electrode of the MOS tube, the source electrode of the MOS tube is connected with one end of the alarm enabling switch, the other end of the alarm enabling switch is connected with the positive input end of the overvoltage detection comparator, the output end of the overvoltage detection comparator is connected with the grid electrode of the MOS tube and used for outputting alarm state signals, and the state signals comprise high level signals and low level signals; updating the over-voltage point, the step of eliminating the over-voltage alarm condition of the hysteresis comparator loop comprising: updating the overvoltage point according to the first parameter value (1+ second parameter value), and transmitting the updated value of the overvoltage point to the negative input end of the overvoltage detection comparator, so that a high level signal at the output end of the overvoltage detection comparator is changed into a low level signal, and an overvoltage alarm state is eliminated; the first parameter value is a value of a reference voltage set through a first parameter register, and the second parameter value is a value of a reference voltage precision set through a second parameter register.
In an embodiment of the present invention, the circuit for setting the overvoltage point includes a selector; and after the boosting chip is electrified to generate overvoltage alarm, transmitting a high level signal at the output end of the overvoltage detection comparator to the selector so that the selector opens a setting channel of the overvoltage point and transmits the updated overvoltage point to a negative input end of the overvoltage detection comparator.
In an embodiment of the present invention, the step of restoring the hysteresis comparator loop includes: and closing the alarm enabling switch to recover the hysteresis comparator loop.
In an embodiment of the present invention, the step of determining whether the hysteresis comparator circuit generates an overvoltage alarm and starting the boost chip when the overvoltage alarm does not occur includes: after the state signal of the output end of the overvoltage detection comparator is read, judging whether the state signal is a low level signal; if yes, judging that no overvoltage alarm occurs, and starting the starting circuit through enabling an output signal to start the boosting chip; if not, the state signal is read again after delaying the preset time and is judged, and the starting circuit is started through enabling the output signal until the overvoltage alarm state is eliminated, so that the boosting chip is started.
The invention provides a starting system of a boosting chip for an automobile LED signal lamp, which comprises a setting circuit of an overvoltage point, a hysteresis comparator circuit and a starting circuit, wherein the setting circuit of the overvoltage point is used for transmitting the set overvoltage point to the hysteresis comparator circuit; the hysteresis comparator loop is used for locking an overvoltage alarm state when the partial pressure of the output voltage is greater than the overvoltage point; the starting system of the boosting chip for the automobile LED signal lamp comprises: the circuit disconnection module is used for disconnecting the hysteresis comparator circuit after the boost chip is electrified; the alarm elimination module is used for updating the overvoltage point and eliminating the overvoltage alarm state of the hysteresis comparator loop; a loop recovery module for recovering the hysteretic comparator loop; and the judgment module is used for judging whether the hysteresis comparator loop generates overvoltage alarm or not and starting the boost chip when the overvoltage alarm does not occur.
Still another aspect of the present invention provides a medium having a computer program stored thereon, which when executed by a processor, implements a method of starting the booster chip for an automotive LED signal lamp.
Another aspect of the present invention provides a starting apparatus of a boost chip, including: a processor and a memory; the memory is used for storing computer programs, and the processor is used for executing the computer programs stored in the memory so as to enable the vehicle LED constant current control equipment to execute the starting method of the boosting chip for the vehicle LED signal lamp.
In a final aspect, the present invention provides a system for starting a boost chip for an automotive LED signal lamp, comprising: the automobile LED signal lamp module comprises a boosting chip; the starting device of the boost chip.
As described above, according to the starting method, system, medium and apparatus of the boost chip for the automotive LED signal lamp of the present invention, the hysteresis comparator circuit is disconnected after the boost chip is powered on; and the problem of locking an overvoltage alarm state of the hysteresis comparator is solved by recovering the hysteresis comparator loop after the overvoltage point is updated, the implementation mode is simple, and the material and labor cost are not increased.
Drawings
Fig. 1 is a circuit diagram showing a chip connection circuit of a method for starting a boost chip for an automotive LED signal lamp according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the inside of a boost chip for an automotive LED signal lamp according to an embodiment of the present invention.
Fig. 3 is a schematic flow chart illustrating a method for starting the boost chip for the automotive LED signal lamp according to an embodiment of the present invention.
Fig. 4 is a flowchart illustrating the operation of a register in an embodiment of the method for starting the boost chip for the automotive LED signal lamp according to the present invention.
Fig. 5 is a schematic structural connection diagram of a starting system of a boost chip for an automotive LED signal lamp according to an embodiment of the present invention.
Description of the element reference numerals
5 starting system of boost chip for automobile LED signal lamp
51 loop disconnect module
52 alarm elimination module
53 loop recovery module
54 judging module
Starting method steps of booster chip for LED signal lamp of S31-S34 automobile
S41-S48 register operation steps
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
According to the starting method, the starting system, the starting medium and the starting equipment of the boost chip for the automobile LED signal lamp, the hysteresis comparator loop is disconnected after the boost chip is electrified; updating the overvoltage point, and eliminating the overvoltage alarm state of the hysteresis comparator loop; restoring the hysteretic comparator loop; and judging whether the loop of the hysteresis comparator generates overvoltage alarm or not, and starting the boosting chip when the overvoltage alarm does not occur so as to solve the problem that the hysteresis comparator locks an overvoltage alarm state, and the realization mode is simple without increasing the material and labor cost.
The following describes in detail a method, a system, a medium, and an apparatus for starting a boost chip for an automotive LED signal lamp according to the present embodiment with reference to the drawings.
As shown in fig. 1, in an embodiment, the boost chip is a TPS92682 chip, and according to the official data manual of the boost chip TPS92682, the boost chip TPS92682 includes a GATE1 control terminal and a GATE2 control terminal, a CH1_ EN control register inside the boost chip is set to a high level signal, and the GATE1 control terminal is controlled by the conversion of a logic circuit inside the boost chip to output a low level signal, so as to implement VOUT1The start-up output of (1); similarly, the control register is set to be a high level signal through the CH2_ EN in the boost chip, and the control end of the GATE2 is controlled to output a low level signal through the conversion of the logic circuit in the boost chip so as to realize VOUT2The start-up output of (2).
As shown in fig. 2, in an embodiment, the boost chip specifically includes a setting circuit of an overvoltage point, a hysteresis comparator circuit, and a start circuit, where the setting circuit of the overvoltage point is used to transmit the set overvoltage point to the hysteresis comparator circuit; the hysteresis comparator loop is used for locking an overvoltage alarm state when the partial pressure of the output voltage is greater than the overvoltage point.
The method for starting the boost chip for the automotive LED signal lamp can be applied to all boost chips in which the setting circuit of the overvoltage point, the hysteresis comparator circuit and the starting circuit are arranged.
Specifically, the circuit for setting the overvoltage point includes a selector through which the set value of the overvoltage point is transmitted to the hysteresis comparator circuit.
Specifically, the hysteresis comparator loop comprises an input voltage end, a current source, an MOS (metal oxide semiconductor) tube, an alarm enabling switch and an overvoltage detection comparator. Input voltage end VDD with the one end of 20uA of electric current source is connected, the other end of 20uA of electric current source with the drain electrode of MOS pipe is connected, the source electrode of MOS pipe with the one end of warning enable switch is connected, the other end of warning enable switch with overvoltage detection comparator's forward input end is connected, overvoltage detection comparator's output with the grid of MOS pipe is connected for the status signal of output warning, status signal includes high level signal and low level signal.
Further, VOUT is the output voltage of the boost chip during operation, and the output voltage is RFB2And RFB1The two resistors are used as the voltage division amount of output voltage after voltage division and are respectively input to the positive input end of the overvoltage detection comparator and the negative input end of the UV comparator, and the UV comparator is used for detecting over-low voltage. The over-voltage detection comparator comprises an OV comparator, and the OV comparator is used for detecting over-voltage. OV THRThe overvoltage detection threshold value, namely an overvoltage point, is set by software through two parameters of CHx _ OVDAC and CHxIADJ. When the software initializes the chip, a normal working voltage and an overvoltage protection voltage are set, and the overvoltage voltage is greater than the normal working voltage. And when the voltage VOUT works normally, the voltage of the VOUT is the normal working voltage set by the software. When VOUT is abnormal and the voltage after voltage division is larger than an overvoltage detection threshold value, namely an overvoltage point, the OV comparator outputs a high signal, CHx _ OV is generated to close chip output, software is informed, and an MOS tube at the rear end of 20uA is conducted. Every time a CHx _ OV overvoltage alarm signal appears and a CHx _ OV _ EN switch is closed, an internal 20uA current source is fed back to the input anode of the OV comparator in a positive feedback mode to form a hysteresis comparator. It should be noted that the high signal may be a high level signal, a high pulse signal, a rising edge signal, or a logic signal with a value of 1, and the low signal may be a low level signal, a low pulse signal, a falling edge signal, or a logic signal with a value of 1The logic signal of 0 can be adaptively set according to the specific requirements of the internal receiving signal of the chip.
Furthermore, according to the comparison relationship that the positive input end and the negative input end of the OV comparator need to satisfy, it can be inferred that the condition that VOUT should satisfy when the alarm is eliminated is as follows: VOUT (volatile organic compound) <(1+RFB2/RFB1)x VFBREF–(IHYST x RFB2) Wherein, IHYSTFor the current value of the current source, when the feedback resistance VOUT is 100k, the generated hysteresis voltage is 2V, namely when the voltage set by the BOOST voltage BOOST circuit is higher than the current actual voltage by more than 2V, the hysteresis comparator can clear the overvoltage alarm state of CHx _ OV, namely the high signal is set as a low signal, and the BOOST voltage BOOST chip can be started normally to work. However, due to the requirement of the quiescent current, if the feedback resistance needs to reach 1M ohm, the generated hysteresis voltage is 20V, that is, when the set voltage of the BOOST chip is higher than the current actual voltage by more than 20V, the hysteresis comparator may clear the over-voltage alarm state of CHx _ OV, and the BOOST chip may start to work normally. However, for most automobiles, the supply voltage is about 9V to 24V, and the BOOST chip can normally work only when the BOOST chip is set to 44V, so the prior art cannot meet the application of 24V to 44V.
In one embodiment, as shown in FIG. 3, a CHx _ OV _ EN switch is found on the positive feedback path according to the chip internal schematic. This switch is used to enable the CHx _ OV over-voltage alarm function, if this function is not enabled all the time, the problem of not enabling BOOST can be solved, but the chip will lose the over-voltage protection capability. In order to enable the chip to start without losing the capability of the over-voltage protection, the embodiment solves the problem by setting a specific start timing sequence.
Further, with a 1M feedback resistance, a CHx _ OV overvoltage alarm will inevitably occur and then be locked out. The reason for the overvoltage is due to the default BOOST overvoltage point setting and the cause of the deadlock is the hysteresis voltage. Therefore, the problem that the BOOST cannot be started can be solved only by changing the set value of the BOOST overvoltage point for updating when the hysteresis comparator does not work so as to clear the CHx _ OV overvoltage alarm state, and the switch CHx _ OV _ EN is disconnected to just enable the hysteresis comparator not to work. After the CHx _ OV overvoltage alarm state is cleared and the CHx _ OV _ EN switch is reconnected, the BOOST chip can work normally without losing the overvoltage protection capability. Therefore, the starting method of the boost chip for the automobile LED signal lamp specifically comprises the following steps:
and S31, disconnecting the hysteresis comparator loop after the boost chip is powered on.
Specifically, the alarm enable switch is opened, thereby opening the hysteresis comparator loop.
And S32, updating the overvoltage point, and eliminating the overvoltage alarm state of the hysteresis comparator loop.
Specifically, the overvoltage point is updated according to a first parameter value (1+ a second parameter value), and an updated value of the overvoltage point is transmitted to a negative input end of the overvoltage detection comparator, so that a high level signal at an output end of the overvoltage detection comparator is changed into a low level signal, and an overvoltage alarm state is eliminated;
The first parameter value is a value of the reference voltage set by a first parameter register, such as a value set by a chxadj register, and the second parameter value is a value of the reference voltage precision set by a second parameter register, such as a value set by a CHx _ OVDAC register.
Further, after the boost chip is powered on to generate an overvoltage alarm, a high level signal at the output end of the overvoltage detection comparator is transmitted to the selector, so that the selector opens a setting channel of the overvoltage point, and the updated overvoltage point is transmitted to a negative input end of the overvoltage detection comparator.
And S33, restoring the hysteresis comparator loop.
Specifically, the alarm enable switch is closed, restoring the hysteresis comparator loop.
And S34, judging whether the hysteresis comparator loop generates overvoltage alarm or not, and starting the boost chip when no overvoltage alarm is generated.
Specifically, after the state signal at the output end of the overvoltage detection comparator is read, whether the state signal is a low level signal is judged;
if yes, judging that no overvoltage alarm occurs, and starting the starting circuit through enabling an output signal to start the boosting chip;
If not, the state signal is read again after delaying the preset time and is judged, and the starting circuit is started through enabling the output signal until the overvoltage alarm state is eliminated, so that the boosting chip is started. The predetermined time may be 1ms or the rest of the delay time suitable for the operating frequency of the boost chip.
Further, as shown in fig. 4, in an embodiment, the starting method of the boost chip for the automotive LED signal lamp takes a TPS92682 chip as an example, and the operating method of the register specifically includes the following steps:
s41, the TPS92682 powers up. The TPS92682 does not enable output after the boost chip is electrified, and is in a state that the boost chip is only electrified but is not started, and power is not supplied to the output of a subsequent circuit. But due to the setting of a large feedback resistor, such as 1M ohm, an overvoltage alarm state occurs when the divided voltage of the output voltage VOUT is larger than an overvoltage point, and the value of the initial CHx _ OV _ EN register is a high level signal, so that the hysteresis comparator loop is switched on, and the alarm state is locked.
S42, clear CHx _ OV _ EN. And changing the value of the CHx _ OV _ EN register from the original high-level signal to a low-level signal to disconnect the alarm enabling switch.
And S43, setting an overpressure point. The numerical value of the overvoltage point is set through the CHxIADJ register, and the error floating range of the overvoltage point, namely the precision of the overvoltage point is set through the CHx _ OVDAC register.
In practical applications, the chxadj register is an 8-bit DAC, and the set value ranges from 85mV to 2.4V, and when chxadj is 9, the set update value VFB of the over-voltage point is setREFIs 85 mV; when chxaiadj is 255, the set update value VFB of the overvoltage point is setREFIt was 2.4V.
In practical application, the CHx _ OVDAC registerSet point and overvoltage point VFBREFThe corresponding relation of the precision of (1) is as follows:
when the set value of the CHx _ OVDAC register is 000, the OVTHR＝VFBREF×(1+0％)；
When the set value of the CHx _ OVDAC register is 001, the OVTHR＝VFBREF×(1+2.5％)；
When the set value of the CHx _ OVDAC register is 010, the OVTHR＝VFBREF×(1+5％)；
When the set value of the CHx _ OVDAC register is 011, the OVTHR＝VFBREF×(1+7.5％)；
When the set value of the CHx _ OVDAC register is 100, OVTHR＝VFBREF×(1+10％)；
When the set value of the CHx _ OVDAC register is 101, OVTHR＝VFBREF×(1+12.5％)；
When the set value of the CHx _ OVDAC register is 110, the OVTHR＝VFBREF×(1+15％)；
When the set value of the CHx _ OVDAC register is 111, the OVTHR＝VFBREF×(1+20％)。
It can be seen that if the value of the CHx _ OVDAC register is 010, the accuracy of the overvoltage point is within an error fluctuation range of 5%. Therefore, the updated value of the overpressure point is 2.4V × (1+ 5%) -2.52V.
And S44, setting CHx _ OV _ EN. And changing the value of the CHx _ OV _ EN register from the original low-level signal to a high-level signal to close the alarm enabling switch.
S45, wait for 1 ms. And providing a delay time for the state setting of the boost chip so as to ensure that all register settings are executed. It should be noted that the delay time of 1ms is only one implementation of the present embodiment, and other delay times suitable for the operating frequency of the boost chip are also included in the scope of the present invention.
S46, reading CHx _ OV. The state value of the CHx _ OV register is read. CHx _ OV may be 1 or 0.
S47, it is determined whether CHx _ OV is 0. If CHx _ OV is 0, go to step S48; if CHx _ OV is 1, the process proceeds to step S45.
S48, the boost chip is enabled by setting CHx _ EN. The value of the CHx _ EN register is set to the high signal.
It should be noted that the protection scope of the method for starting the boost chip for the automotive LED signal lamp according to the present invention is not limited to the execution sequence of the steps illustrated in the embodiment, and all the solutions obtained by adding, subtracting, and replacing the steps according to the principles of the present invention are included in the protection scope of the present invention.
As shown in fig. 5, in an embodiment, the boost chip includes a setting circuit of an overvoltage point, a hysteresis comparator circuit, and a start circuit, where the setting circuit of the overvoltage point is used to transmit the set overvoltage point to the hysteresis comparator circuit; the hysteresis comparator loop is used for locking an overvoltage alarm state when the partial pressure of the output voltage is greater than the overvoltage point. The starting system 5 of the boosting chip for the automobile LED signal lamp comprises: a loop disconnect module 51, an alarm elimination module 52, a loop restore module 53, and a decision module 54.
The loop disconnection module 51 is configured to disconnect the hysteresis comparator loop after the boost chip is powered on;
the alarm eliminating module 52 is configured to update the overvoltage point and eliminate an overvoltage alarm state of the hysteresis comparator loop;
the loop recovery module 53 is configured to recover the hysteresis comparator loop;
the judging module 54 is configured to judge whether an overvoltage alarm occurs in the hysteresis comparator circuit, and start the boost chip when the overvoltage alarm does not occur.
It should be noted that the division of each module of the starting system of the boost chip for the automotive LED signal lamp is only a division of a logic function, and the actual implementation may be wholly or partially integrated into one physical entity, or may be physically separated. And the modules can be realized in a form that all software is called by the processing element, or in a form that all the modules are realized in a form that all the modules are called by the processing element, or in a form that part of the modules are called by the hardware. For example: the x module can be a separately established processing element, and can also be integrated in a certain chip of the system. The x-module may be stored in the memory of the system in the form of program codes, and may be called by a processing element of the system to execute the following functions of the x-module. Other modules are implemented similarly. All or part of the modules can be integrated together or can be independently realized. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, the steps of the above method or the following modules may be implemented by hardware integrated logic circuits in a processor element or instructions in software.
The following modules may be one or more integrated circuits configured to implement the above methods, for example: one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Field Programmable Gate Arrays (FPGAs), and the like. When some of the following modules are implemented in the form of a program code called by a Processing element, the Processing element may be a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of calling the program code. These modules may be integrated together and implemented in the form of a System-on-a-chip (SOC).
It should be noted that the starting system of the boost chip for the automotive LED signal lamp according to the present invention can implement the starting method of the boost chip for the automotive LED signal lamp according to the present invention, but the implementation apparatus of the starting method of the boost chip for the automotive LED signal lamp according to the present invention includes, but is not limited to, the structure of the starting system of the boost chip for the automotive LED signal lamp exemplified in the present embodiment, and all the structural modifications and substitutions of the prior art made according to the principle of the present invention are included in the protection scope of the present invention.
In an embodiment, the computer storage medium of the present invention stores a computer program, and the computer program is executed by a processor to implement the method for starting the boost chip for the automotive LED signal lamp.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the above method embodiments may be performed by hardware associated with a computer program. The aforementioned computer program may be stored in a computer readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned computer-readable storage media comprise: various computer storage media that can store program codes, such as ROM, RAM, magnetic or optical disks.
In one embodiment, the starting apparatus of the boost chip includes: a processor, a memory, a transceiver, a communication interface, or/and a system bus. The memory is used for storing computer programs, the communication interface is used for communicating with other equipment, and the processor and the transceiver are used for operating the computer programs so that the starting equipment of the boost chip executes each step of the starting method of the boost chip for the automobile LED signal lamp.
The above-mentioned system bus may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The system bus may be divided into an address bus, a data bus, a control bus, and the like. The communication interface is used for realizing communication between the database access device and other equipment (such as a client, a read-write library and a read-only library). The memory may include a Random Access Memory (RAM), and may further include a non-volatile memory (non-volatile memory), such as at least one disk memory.
The processor may be a general-purpose processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; the device can also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, or discrete hardware component.
In an embodiment, the present embodiment provides a starting system of a boost chip for an automotive LED signal lamp, including: the automobile LED signal lamp module comprises a boosting chip; the starting device of the boost chip.
In summary, according to the starting method, the starting system, the starting medium and the starting device of the boost chip for the automobile LED signal lamp, provided by the invention, the hysteresis comparator circuit is disconnected after the boost chip is powered on; and the problem of locking an overvoltage alarm state of the hysteresis comparator is solved by recovering the hysteresis comparator loop after the overvoltage point is updated, the implementation mode is simple, and the material and labor cost are not increased. The invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (10)
1. The starting method of the boost chip for the automobile LED signal lamp is characterized in that the boost chip comprises a setting circuit of an overvoltage point, a hysteresis comparator circuit and a starting circuit, wherein the setting circuit of the overvoltage point is used for transmitting the set overvoltage point to the hysteresis comparator circuit; the hysteresis comparator loop is used for locking an overvoltage alarm state when the partial pressure of the output voltage is greater than the overvoltage point;
the starting method of the boosting chip for the automobile LED signal lamp comprises the following steps:
after the boost chip is electrified, disconnecting the hysteresis comparator loop;
updating the overvoltage point, and eliminating the overvoltage alarm state of the hysteresis comparator loop;
restoring the hysteretic comparator loop;
and judging whether the hysteresis comparator loop generates overvoltage alarm or not, and starting the boost chip when the overvoltage alarm does not occur.
2. The method for starting a boost chip for an automotive LED signal lamp according to claim 1, wherein said hysteretic comparator circuit includes an alarm enable switch; after the boosting chip is powered on, the step of disconnecting the hysteresis comparator loop comprises the following steps:
opening the alarm enable switch, thereby opening the hysteretic comparator loop.
3. The method for starting the boost chip for the LED signal lamp of the automobile according to claim 2, wherein the hysteresis comparator circuit further comprises an input voltage end, a current source, a MOS tube and an overvoltage detection comparator;
the input voltage end is connected with one end of the current source, the other end of the current source is connected with the drain electrode of the MOS tube, the source electrode of the MOS tube is connected with one end of the alarm enabling switch, the other end of the alarm enabling switch is connected with the positive input end of the overvoltage detection comparator, the output end of the overvoltage detection comparator is connected with the grid electrode of the MOS tube and used for outputting alarm state signals, and the state signals comprise high level signals and low level signals;
updating the over-voltage point, the step of eliminating the over-voltage alarm condition of the hysteresis comparator loop comprising:
updating the overvoltage point according to the first parameter value (1+ second parameter value), and transmitting the updated value of the overvoltage point to the negative input end of the overvoltage detection comparator, so that a high level signal at the output end of the overvoltage detection comparator is changed into a low level signal, and an overvoltage alarm state is eliminated;
The first parameter value is a value of a reference voltage set through a first parameter register, and the second parameter value is a value of a reference voltage precision set through a second parameter register.
4. The starting method of the booster chip for the LED signal lamp of the automobile according to claim 3,
the setting circuit of the overvoltage point comprises a selector;
and after the boosting chip is electrified to generate overvoltage alarm, transmitting a high level signal at the output end of the overvoltage detection comparator to the selector so that the selector opens a setting channel of the overvoltage point and transmits the updated overvoltage point to a negative input end of the overvoltage detection comparator.
5. A starting method of a boost chip for an automotive LED signal lamp according to claim 2, wherein the step of restoring said hysteresis comparator circuit comprises:
and closing the alarm enabling switch to recover the hysteresis comparator loop.
6. A method as claimed in claim 3, wherein the step of determining whether an over-voltage alarm occurs in the hysteresis comparator circuit and activating the boost chip when the over-voltage alarm does not occur comprises:
After the state signal of the output end of the overvoltage detection comparator is read, judging whether the state signal is a low level signal;
if yes, judging that no overvoltage alarm occurs, and starting the starting circuit through enabling an output signal to start the boosting chip;
if not, the state signal is read again after delaying the preset time and is judged, and the starting circuit is started through enabling the output signal until the overvoltage alarm state is eliminated, so that the boosting chip is started.
7. A starting system of a boosting chip for an automobile LED signal lamp is characterized in that the boosting chip comprises a setting circuit of an overvoltage point, a hysteresis comparator circuit and a starting circuit, wherein the setting circuit of the overvoltage point is used for transmitting the set overvoltage point to the hysteresis comparator circuit; the hysteresis comparator loop is used for locking an overvoltage alarm state when the partial pressure of the output voltage is greater than the overvoltage point;
the starting system of the boosting chip for the automobile LED signal lamp comprises:
the circuit disconnection module is used for disconnecting the hysteresis comparator circuit after the boost chip is electrified;
the alarm elimination module is used for updating the overvoltage point and eliminating the overvoltage alarm state of the hysteresis comparator loop;
A loop recovery module for recovering the hysteretic comparator loop;
and the judgment module is used for judging whether the hysteresis comparator loop generates overvoltage alarm or not and starting the boost chip when the overvoltage alarm does not occur.
8. A medium having stored thereon a computer program, characterized in that the program, when being executed by a processor, implements a method of starting a booster chip for an automotive LED signal lamp according to any one of claims 1 to 6.
9. A starting apparatus of a booster chip, comprising: a processor and a memory;
the memory is used for storing a computer program, and the processor is used for executing the computer program stored by the memory so as to enable the LED constant current control device for the vehicle to execute the starting method of the boost chip for the LED signal lamp of the vehicle as claimed in any one of claims 1 to 6.
10. The utility model provides a starting system of car LED signal lamp is with chip that steps up which characterized in that includes:
the automobile LED signal lamp module comprises a boosting chip;
the starting apparatus of the booster chip as claimed in claim 9.
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| CN113665475A (en) * | 2021-09-09 | 2021-11-19 | 东风柳州汽车有限公司 | Control method and device for automobile lamp |
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| CN110146768A (en) * | 2019-05-05 | 2019-08-20 | 浙江大学 | Earth leakage protective device self-checking unit and earth leakage protective device |
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| TWI329421B (en) * | 2006-09-18 | 2010-08-21 | Advanced Analog Technology Inc | Pwm boost system and start-up method thereof |
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| CN105322792A (en) * | 2014-06-25 | 2016-02-10 | 半导体元件工业有限责任公司 | Power converter using hysteretic boost architecture and method therefor |
| CN105553245A (en) * | 2015-09-10 | 2016-05-04 | 许继电源有限公司 | Soft start circuit |
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