Drive control circuit, lighting circuit, lamp and vehicle

Abstract

The invention discloses a driving control circuit, a lighting circuit, a lamp and a vehicle. The drive control circuit comprises a control chip and a latch circuit. The main control end of the control chip is used for being connected with the lighting module and outputting a main control signal to the lighting module so that the lighting module can work. The first end of the latch circuit is connected with the auxiliary control end of the control chip, and the second end of the latch circuit is used for being connected with an illumination module and outputting a latch control signal to the illumination module based on an auxiliary control signal output by the control chip, so that the illumination module is kept in a working state. In the driving control circuit, a control chip can be directly connected with an illumination module through a main control end to control the illumination module to work, and can latch and convert an auxiliary control signal into a continuous latch control signal through a latch circuit connected with an auxiliary control end, so that when the control chip fails, the illumination module can be controlled to work. And the lighting module can still maintain a normal working state.

Description

Technical Field

[0001] The present invention relates to the technical field of lamps, and in particular to a drive control circuit, a lighting circuit, a lamp and a vehicle. Background Art

[0002] In existing lighting circuits, a control signal (such as a high-level signal) is usually output to a driver chip in a lighting module through a control chip, so that the driver chip drives and controls the LED light-emitting unit to work and realize lighting. When the control chip fails and cannot output the control signal, the lighting module cannot continue to work normally. In particular, when this lighting circuit is used in a vehicle, if the control chip fails, the lighting module in the vehicle will be shut down, which cannot meet the functional safety requirements of the entire vehicle. Summary of the invention

[0003] Embodiments of the present invention provide a driving control circuit, a lighting circuit, a lamp and a vehicle to solve the problem of lighting module shutting down due to control chip failure in the existing lighting circuit.

[0004] An embodiment of the present invention provides a driving control circuit, including a control chip and a latch circuit; The main control terminal of the control chip is used to connect to the lighting module and output a main control signal to the lighting module to make the lighting module work; The first end of the latch circuit is connected to the sub-control end of the control chip, and the second end of the latch circuit is used to connect to the lighting module, and is used to output a latch control signal to the lighting module based on the sub-control signal output by the control chip, so as to maintain the lighting module in a working state.

[0005] Preferably, the latch circuit comprises a first latch module and a second latch module; The first end of the first latch module is connected to the auxiliary control end of the control chip, and the second end of the first latch module is used to connect to the lighting module, and is used to output a latch control signal to the lighting module based on the auxiliary control signal output by the control chip, so that the lighting module maintains a working state; The first end of the second latch module is connected to the auxiliary control end of the control chip, and the second end of the second latch module is connected to the second end of the first latch module, and is used to control the first latch module to stop outputting the latch control signal based on the shutdown control signal output by the control chip.

[0006] Preferably, the first latch module includes a first control tube, a second control tube, a first voltage-dividing resistor, a second voltage-dividing resistor, a first diode and a second diode; The first end of the first control tube is connected to the power supply end through the first voltage-dividing resistor and the second voltage-dividing resistor arranged in series, and the second end of the first control tube is grounded; The first end of the second control tube is used to connect to the power supply end, the second end of the second control tube is used to connect to the lighting module, and the third end of the second control tube is connected to the connection node between the first voltage-dividing resistor and the second voltage-dividing resistor; The anode of the first diode is connected to the second end of the second control tube, and the cathode of the first diode is connected to the third end of the first control tube; The anode of the second diode is connected to the first auxiliary control terminal of the control chip, and the cathode of the second diode is connected to the third terminal of the first control tube.

[0007] Preferably, the first latch module further includes a first voltage regulator tube and a second voltage regulator tube; The anode of the first voltage regulator tube is connected to the second end of the first control tube, and the cathode of the first voltage regulator tube is connected to the second end of the second control tube; The anode of the second voltage regulator tube is connected to the third end of the second control tube, and the cathode of the second voltage regulator tube is connected to the first end of the second control tube.

[0008] Preferably, the second latch module includes a third control tube; The first end of the third control tube is connected to the anode of the first diode, the second end of the third control tube is grounded, and the third end of the third control tube is connected to the second auxiliary control end of the control chip.

[0009] Preferably, the second latch module further includes a third voltage-dividing resistor and a fourth voltage-dividing resistor; The third voltage-dividing resistor and the fourth voltage-dividing resistor are connected in series between the second auxiliary control terminal of the control chip and the ground; A connection node between the third voltage-dividing resistor and the fourth voltage-dividing resistor is connected to the third end of the third control tube.

[0010] Preferably, the drive control circuit further includes a third diode and a fourth diode; The anode of the third diode is connected to the main control terminal of the control chip, and the cathode of the third diode is used to connect to the lighting module; The anode of the fourth diode is connected to the second end of the latch circuit, and the cathode of the fourth diode is used to connect to the lighting module.

[0011] An embodiment of the present invention further provides a lighting circuit, comprising a lighting module and any one of the above described drive control circuits; The lighting module is connected to the control chip and is used to work based on the main control signal; The lighting module is connected to the second end of the latch circuit and is used to maintain a working state based on a latch control signal output by the latch circuit.

[0012] An embodiment of the present invention further provides a lamp, comprising the above-mentioned lighting circuit.

[0013] An embodiment of the present invention further provides a vehicle, comprising the above-mentioned lamp.

[0014] In the driving control circuit, lighting circuit, lamp and vehicle provided by the embodiments of the present invention, the control chip can be directly connected to the lighting module through the main control end to control the operation of the lighting module, and can also latch the sub-control signal into a continuous latch control signal through the latch circuit connected to the sub-control end, so that when the control chip fails, the lighting module can still maintain a normal working state. When used in a vehicle, when a vehicle fault causes the control chip to fail, the lighting state of the lamp can still be maintained, thereby automatically realizing the limp mode control of the lamp in the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0016] Figure 1 is a block diagram of a lighting circuit in one embodiment of the present invention; Figure 2 1 is a schematic diagram of a circuit structure of a drive control circuit in an embodiment of the present invention.

[0017] In the figure: 1. control chip; 2. latch circuit; 21. first latch module; 22. second latch module; 3. lighting module; 31. drive chip; 32. LED light-emitting unit; 4. power supply. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] It should be understood that the present invention can be implemented in different forms and should not be construed as being limited to the embodiments set forth herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present invention to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0020] It should be understood that when an element or layer is referred to as being "on, adjacent to, connected to or coupled to other elements or layers, it may be directly on, adjacent to, connected to or coupled to other elements or layers, or there may be intervening elements or layers. In contrast, when an element is referred to as being "directly on, directly adjacent to, directly connected to or directly coupled to other elements or layers, there may be no intervening elements or layers. It should be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present invention, the first element, component, region, layer or part discussed below may be represented as a second element, component, region, layer or part.

[0021] Spatially relative terms such as "under," "beneath," "below," "under," "above," "above," and the like may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that the spatially relative terms are intended to include different orientations of the device in use and operation in addition to the orientations shown in the figures. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "above" the other elements or features. Thus, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0022] The purpose of the terms used herein is only to describe specific embodiments and is not intended to be limiting of the present invention. When used herein, the singular forms "one", "an" and "said / the" are also intended to include plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "consisting of" and / or "comprising", when used in this specification, determine the presence of the features, integers, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, parts and / or groups. When used herein, the term "and / or" includes any and all combinations of the relevant listed items.

[0023] In order to fully understand the present invention, detailed structures and steps will be presented in the following description to illustrate the technical solutions proposed by the present invention. The preferred embodiments of the present invention are described in detail below, but in addition to these detailed descriptions, the present invention may also have other implementations.

[0024] An embodiment of the present invention provides a driving control circuit, including a control chip 1 and a latch circuit 2; the main control terminal GPIO1 of the control chip 1 is used to connect to the lighting module 3 and output a main control signal to the lighting module 3 to make the lighting module 3 work; the first end of the latch circuit 2 is connected to the secondary control terminal of the control chip 1, and the second end of the latch circuit 2 is used to connect to the lighting module 3, and is used to output a latch control signal to the lighting module 3 based on the secondary control signal output by the control chip 1, so as to maintain the lighting module 3 in a working state.

[0025] As an example, the driving control circuit includes a control chip 1 and a latch circuit 2. The main control terminal GPIO1 of the control chip 1 is used to connect the lighting module 3, and the lighting module 3 may include a driving chip 31 and an LED light-emitting unit 32 connected to the driving chip 31. The LED light-emitting unit 32 can work under the control of the driving chip 31. The LED light-emitting unit 32 is also connected to a power supply 4, and the power supply 4 is used to supply power to the LED light-emitting unit 32. The main control terminal GPIO1 of the control chip 1 is connected to the driving chip 31, and outputs a main control signal, such as a high-level signal, to the driving chip 31 to control the driving chip 31 to work, so that the driving chip 31 controls the LED light-emitting unit 32 to work, and the lighting module 3 is in a working state. When the driving chip 31 does not output the main control signal, for example, when the main control terminal GPIO1 of the driving chip 31 outputs a low-level signal, is in a high-impedance state or a short-circuit state, the driving chip 31 does not work. The first end of the latch circuit 2 is connected to the auxiliary control end of the control chip 1, and the second end of the latch circuit 2 is used to connect to the lighting module 3, specifically, it can be connected to the driving chip 31 in the lighting module 3. After receiving the auxiliary control signal output by the control chip 1, the latch circuit 2 can continuously output the latch control signal to the driving chip 31, so that the driving chip 31 can continue to work after the main control signal or the auxiliary control signal disappears, so that the lighting module 3 remains in a working state.

[0026] In this example, the control chip 1 can directly connect to the lighting module 3 through the main control terminal GPIO1 to control the operation of the lighting module 3. It can also latch the sub-control signal into a continuous latch control signal through the latch circuit 2 connected to the sub-control terminal, so that when the control chip 1 fails, the lighting module 3 can still maintain a normal working state, thereby avoiding the problem of uncontrolled shutdown of the lighting module 3 due to the failure of the control chip 1.

[0027] In one embodiment, the latch circuit 2 includes a first latch module 21 and a second latch module 22; the first end of the first latch module 21 is connected to the sub-control end of the control chip 1, and the second end of the first latch module 21 is used to connect to the lighting module 3, and is used to output a latch control signal to the lighting module 3 based on the sub-control signal output by the control chip 1, so that the lighting module 3 maintains a working state; the first end of the second latch module 22 is connected to the sub-control end of the control chip 1, and the second end of the second latch module 22 is connected to the second end of the first latch module 21, and is used to control the first latch module 21 to stop outputting the latch control signal based on the shutdown control signal output by the control chip 1.

[0028] As an example, the sub-control terminal of the control chip 1 includes a first sub-control terminal GPIO2 and a second sub-control terminal GPIO3; the latch circuit 2 includes a first latch module 21 and a second latch module 22, the first end of the first latch module 21 is connected to the first sub-control terminal GPIO2 of the control chip 1, the second end of the first latch module 21 is used to connect the lighting module 3, the first end of the second latch module 22 is connected to the second sub-control terminal GPIO3 of the control chip 1, and the second end of the second latch module 22 is connected to the second end of the first latch module 21. The control chip 1 can output a high-level signal through the first sub-control terminal GPIO2 and a low-level signal through the second sub-control terminal GPIO3 to form a sub-control signal, so that the first latch module 21 works and the second latch module 22 does not work, so that the first latch module 21 can continuously output the latch control signal to keep the lighting module 3 in a working state. The control chip 1 can output a high-level signal through the second sub-control terminal GPIO3 and a low-level signal through the first sub-control terminal GPIO2 to form a shutdown control signal, so that the second latch module 22 can control the first latch module 21 to stop outputting the latch control signal to the driving chip 31 based on the shutdown control signal, so that after the control chip 1 stops outputting the main control signal, the lighting module 3 can be normally shut down and stop working.

[0029] In one embodiment, the first latch module 21 includes a first control tube Q1, a second control tube Q2, a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a first diode D1 and a second diode D2; the first end of the first control tube Q1 is connected to the power supply terminal LB through the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 arranged in series, and the second end of the first control tube Q1 is grounded; the first end of the second control tube Q2 is used to connect the power supply terminal LB, the second end of the second control tube Q2 is connected to the lighting module 3, and the third end of the second control tube Q2 is connected to the connection node between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2; the anode of the first diode D1 is connected to the second end of the second control tube Q2, and the cathode of the first diode D1 is connected to the third end of the first control tube Q1; the anode of the second diode D2 is connected to the first auxiliary control terminal GPIO2 of the control chip 1, and the cathode of the second diode D2 is connected to the third end of the first control tube Q1.

[0030] As an example, the first latch module 21 includes a first control tube Q1, a second control tube Q2, a first voltage-dividing resistor R1, a second voltage-dividing resistor R2, a first diode D1, and a second diode D2. The first control tube Q1 can be an NMOS tube, the first end of the first control tube Q1 is the drain of the NMOS tube, the second end of the first control tube Q1 is the source of the NMOS tube, and the third end of the first control tube Q1 is the gate of the NMOS tube. The second control tube Q2 can be a PMOS tube, the first end of the second control tube Q2 is the source of the PMOS tube, the second end of the second control tube Q2 is the drain of the PMOS tube, and the third end of the second control tube Q2 is the gate of the PMOS tube. The first end of the first control tube Q1 is connected to the power supply terminal LB through the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 arranged in series. The power supply terminal LB can be a connection node between the power supply 4 and the LED light-emitting unit 32 in the lighting module 3, and the second end of the first control tube Q1 is grounded; the first end of the second control tube Q2 is used to connect to the power supply terminal LB, the second end of the second control tube Q2 is connected to the lighting module 3, and the third end of the second control tube Q2 is connected to the connection node between the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2; the anode of the first diode D1 is connected to the second end of the second control tube Q2, and the cathode of the first diode D1 is connected to the third end of the first control tube Q1; the anode of the second diode D2 is connected to the first auxiliary control terminal GPIO2 of the control chip 1, and the cathode of the second diode D2 is connected to the third end of the first control tube Q1.

[0031] When the first latch module 21 is working, the sub-control end of the control chip 1 outputs a sub-control signal, specifically, a high-level signal is output through the first sub-control end GPIO2, and a low-level signal is output through the second sub-control end GPIO3. The high-level signal output by the first sub-control end GPIO2 is output to the first control tube Q1 through the second diode D2, so that the first control tube Q1 is turned on, and the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 form a voltage-dividing circuit connected between the power supply 4 and the ground. The voltage applied to both ends of the first voltage-dividing resistor R1 turns on the second control tube Q2. Therefore, the electric energy provided by the power supply end LB can be continuously output to the lighting module 3 through the second control tube Q2, that is, the latch control signal is output. At the same time, since the anode of the first diode D1 is connected to the second end of the second control tube Q2, and the cathode of the first diode D1 is connected to the third end of the first control tube Q1, the electric energy provided by the power supply terminal LB can also be continuously output to the first control tube Q1, so that the first control tube Q1 remains in the on state. At this time, even if the control chip 1 is affected by a short circuit fault, the main control terminal GPIO1, the first sub-control terminal GPIO2 and the second sub-control terminal GPIO3 all output low-level signals, or the control chip 1 is affected by a short circuit fault, the main control terminal GPIO1, the first sub-control terminal GPIO2 and the second sub-control terminal GPIO3 are all in a high-impedance state, the electric energy provided by the power supply terminal LB can still keep the first control tube Q1 turned on, so that the second control tube Q2 is still in the on state, and the first latch module 21 can continuously output the latch control signal to control the lighting module 3 to continue working.

[0032] In one embodiment, the first latch module 21 also includes a first voltage regulator tube D3 and a second voltage regulator tube D4; the anode of the first voltage regulator tube D3 is connected to the second end of the first control tube Q1, and the cathode of the first voltage regulator tube D3 is connected to the second end of the second control tube Q2; the anode of the second voltage regulator tube D4 is connected to the third end of the second control tube Q2, and the cathode of the second voltage regulator tube D4 is connected to the first end of the second control tube Q2.

[0033] As an example, the first latch module 21 also includes a first voltage-stabilizer tube D3 and a second voltage-stabilizer tube D4; the anode of the first voltage-stabilizer tube D3 is connected to the second end of the first control tube Q1, and the cathode of the first voltage-stabilizer tube D3 is connected to the second end of the second control tube Q2; the anode of the second voltage-stabilizer tube D4 is connected to the third end of the second control tube Q2, and the cathode of the second voltage-stabilizer tube D4 is connected to the first end of the second control tube Q2. The first voltage-stabilizer tube D3 is used to stabilize the voltage output to the lighting module 3, that is, the voltage of the latch control signal, and the second voltage-stabilizer tube D4 is used to stabilize the voltage between the first end and the third end of the second control tube Q2, so that the second control tube Q2 maintains a stable on state.

[0034] In one embodiment, the second latch module 22 includes a third control tube Q3; the first end of the third control tube Q3 is connected to the anode of the first diode D1, the second end of the third control tube Q3 is grounded, and the third end of the third control tube Q3 is connected to the second auxiliary control terminal GPIO3 of the control chip 1.

[0035] As an example, the second latch module 22 includes a third control tube Q3. The third control tube Q3 can be an NMOS tube, the third end of the third control tube Q3 is the gate of the NMOS tube, the first end of the third control tube Q3 is the drain of the NMOS tube, and the second end of the third control tube Q3 is the source of the NMOS tube. The first end of the third control tube Q3 is connected to the anode of the first diode D1, the second end of the third control tube Q3 is grounded, and the third end of the third control tube Q3 is connected to the second auxiliary control terminal GPIO3 of the control chip 1.

[0036] When the second latch module 22 is working, the sub-control end of the control chip 1 outputs a shutdown control signal, specifically outputs a high-level signal through the second sub-control end GPIO3, and the first sub-control end GPIO2 outputs a low-level signal. The high-level signal output by the second sub-control end GPIO3 is output to the third control tube Q3, so that the third control tube Q3 is turned on, and then the anode of the first diode D1 has no voltage input, and the electric energy provided by the power supply end LB is no longer output to the first control tube Q1. At the same time, the second sub-control end GPIO3 also outputs a low-level signal, so that the first control tube Q1 is turned off, causing the second control tube Q2 to be turned off as well. The first latch module 21 can no longer continue to output the latch control signal. If the control chip 1 also stops outputting the main control signal through the main control end GPIO1, the lighting module 3 will be turned off and stop working.

[0037] In one embodiment, the second latch module 22 also includes a third voltage-dividing resistor R3 and a fourth voltage-dividing resistor R4; the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are connected in series between the second sub-control terminal GPIO3 of the control chip 1 and the ground; the connection node between the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 is connected to the third end of the third control tube Q3.

[0038] As an example, the second latch module 22 further includes a third voltage-dividing resistor R3 and a fourth voltage-dividing resistor R4; the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are connected in series between the second auxiliary control terminal GPIO3 of the control chip 1 and the ground; the connection node between the third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 is connected to the third end of the third control tube Q3. The third voltage-dividing resistor R3 and the fourth voltage-dividing resistor R4 are used to provide a turn-on voltage for the third control tube Q3, and the turn-on voltage of the third control tube Q3 is the same as the voltage across the fourth voltage-dividing resistor R4.

[0039] As an example, the first latch module 21 also includes a first resistor R5, a second resistor R6, a third resistor R7 and a fourth resistor R8. The first resistor R5 and the second resistor R6 are connected in series between the second end of the second control tube Q2 and the anode of the first diode D1, and play a current limiting role. The connection node between the first resistor R5 and the second resistor R6 is also connected to the lighting module 3. When the control chip 1 is in a short circuit fault, the main control terminal GPIO1, the first sub-control terminal GPIO2 and the second sub-control terminal GPIO3 are all in a high level state, the third control tube Q3 is turned on, but there is still a voltage at the connection node between the first resistor R5 and the second resistor R6, and the latch control signal can still be output normally. The third resistor R7 is connected between the first sub-control terminal GPIO2 and the second diode D2, and plays a current limiting role. The two ends of the fourth resistor R8 are respectively connected to the second end and the third end of the first control tube Q1, and are used to provide a stable start-up voltage for the first control tube Q1.

[0040] As an example, the first latch module 21 further includes a first filter capacitor C1 and a second filter capacitor C2. The two ends of the first filter capacitor C1 are respectively connected to the first end and the third end of the second control tube Q2, and the two ends of the second filter capacitor C2 are respectively connected to the second end and the third end of the first control tube Q1, which play a filtering role.

[0041] In one embodiment, the drive control circuit also includes a third diode D5 and a fourth diode D6; the anode of the third diode D5 is connected to the main control terminal GPIO1 of the control chip 1, and the cathode of the third diode D5 is used to connect to the lighting module 3; the anode of the fourth diode D6 is connected to the second end of the latch circuit 2, and the cathode of the fourth diode D6 is used to connect to the lighting module 3.

[0042] As an example, the drive control circuit further includes a third diode D5 and a fourth diode D6; the anode of the third diode D5 is connected to the main control terminal GPIO1 of the control chip 1, and the cathode of the third diode D5 is used to connect the lighting module 3; the anode of the fourth diode D6 is connected to the second end of the latch circuit 2, and the cathode of the fourth diode D6 is used to connect the lighting module 3. The third diode D5 and the fourth diode D6 are used to limit the direction of current flow, so as to prevent the voltage output to the lighting module 3 from being connected to the main control terminal GPIO1 of the control chip 1, or being connected to the latch circuit 2. An embodiment of the present invention also provides a lighting circuit, comprising a lighting module 3 and the driving control circuit of any one of the above embodiments; the lighting module 3 is connected to the control chip 1, and is used to work based on a main control signal; the lighting module 3 is connected to the second end of the latch circuit 2, and is used to maintain a working state based on a latch control signal output by the latch circuit 2.

[0043] As an example, the lighting circuit includes a lighting module 3 and a driving control circuit in any of the above examples. The lighting module 3 may include a driving chip 31 and an LED light-emitting unit 32 connected to the driving chip 31, and the LED light-emitting unit 32 is also connected to a power supply 4, and the power supply 4 is used to supply power to the LED light-emitting unit 32. The driving end of the driving chip 31 is connected to the main control end GPIO1 of the control chip 1, and can control the LED light-emitting unit 32 to work when the main control end GPIO1 of the control chip 1 outputs a main control signal. The driving end of the driving chip 31 is also connected to the second end of the latch circuit 2, and can control the LED light-emitting unit 32 to work when the latch circuit 2 outputs a latch control signal. In this example, the control chip 1 can directly connect to the lighting module 3 through the main control end GPIO1 to control the lighting module 3 to work, and can also latch the secondary control signal into a continuous latch control signal through the latch circuit 2 connected to the secondary control end, so that when the control chip 1 fails, the lighting module 3 can still maintain a normal working state, and can avoid the problem of uncontrolled shutdown of the lighting module 3 caused by the failure of the control chip 1.

[0044] An embodiment of the present invention further provides a lamp, comprising the lighting circuit in the above embodiment.

[0045] As an example, the lamp includes the lighting circuit in the above example. In this example, the control chip 1 in the lighting circuit can directly connect to the lighting module 3 through the main control terminal GPIO1 to control the operation of the lighting module 3, and can also latch the sub-control signal into a continuous latch control signal through the latch circuit 2 connected to the sub-control terminal, so that when the control chip 1 fails, the lighting module 3 can still maintain a normal working state, thereby avoiding the problem of uncontrolled shutdown of the lighting module 3 due to the failure of the control chip 1.

[0046] An embodiment of the present invention further provides a vehicle, comprising the lamp in the above embodiment.

[0047] As an example, the vehicle includes the lamp in the above example. In this type of lamp, the control chip 1 in the lighting circuit can directly connect to the lighting module 3 through the main control end GPIO1 to control the operation of the lighting module 3, and can also latch the sub-control signal into a continuous latch control signal through the latch circuit 2 connected to the sub-control end, so that when the control chip 1 fails, the lighting module 3 can still maintain a normal working state. When used in a vehicle, when a vehicle fault causes the control chip 1 to fail, the lighting state of the lamp can be maintained, thereby automatically realizing the limp mode control of the lamp in the vehicle.

[0048] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A drive control circuit, characterized in that: Including a control chip and a latch circuit; The main control terminal of the control chip is used to connect to the lighting module and output a main control signal to the lighting module to make the lighting module work; The first end of the latch circuit is connected to the sub-control end of the control chip, and the second end of the latch circuit is used to connect to the lighting module, and is used to output a latch control signal to the lighting module based on the sub-control signal output by the control chip, so as to maintain the lighting module in a working state.

2. The drive control circuit according to claim 1, characterized in that: The latch circuit comprises a first latch module and a second latch module; The first end of the first latch module is connected to the auxiliary control end of the control chip, and the second end of the first latch module is used to connect to the lighting module, and is used to output a latch control signal to the lighting module based on the auxiliary control signal output by the control chip, so that the lighting module maintains a working state; The first end of the second latch module is connected to the auxiliary control end of the control chip, and the second end of the second latch module is connected to the second end of the first latch module, and is used to control the first latch module to stop outputting the latch control signal based on the shutdown control signal output by the control chip.

3. The drive control circuit according to claim 2, characterized in that: The first latch module includes a first control tube, a second control tube, a first voltage-dividing resistor, a second voltage-dividing resistor, a first diode and a second diode; The first end of the first control tube is connected to the power supply end through the first voltage-dividing resistor and the second voltage-dividing resistor arranged in series, and the second end of the first control tube is grounded; The first end of the second control tube is used to connect to the power supply end, the second end of the second control tube is used to connect to the lighting module, and the third end of the second control tube is connected to the connection node between the first voltage-dividing resistor and the second voltage-dividing resistor; The anode of the first diode is connected to the second end of the second control tube, and the cathode of the first diode is connected to the third end of the first control tube; The anode of the second diode is connected to the first auxiliary control terminal of the control chip, and the cathode of the second diode is connected to the third terminal of the first control tube.

4. The drive control circuit according to claim 3, characterized in that: The first latch module also includes a first voltage regulator tube and a second voltage regulator tube; The anode of the first voltage regulator tube is connected to the second end of the first control tube, and the cathode of the first voltage regulator tube is connected to the second end of the second control tube; The anode of the second voltage regulator tube is connected to the third end of the second control tube, and the cathode of the second voltage regulator tube is connected to the first end of the second control tube.

5. The drive control circuit according to claim 3, characterized in that: The second latch module includes a third control tube; The first end of the third control tube is connected to the anode of the first diode, the second end of the third control tube is grounded, and the third end of the third control tube is connected to the second auxiliary control end of the control chip.

6. The drive control circuit according to claim 5, characterized in that: The second latch module further includes a third voltage-dividing resistor and a fourth voltage-dividing resistor; The third voltage-dividing resistor and the fourth voltage-dividing resistor are connected in series between the second auxiliary control terminal of the control chip and the ground; A connection node between the third voltage-dividing resistor and the fourth voltage-dividing resistor is connected to the third end of the third control tube.

7. The drive control circuit according to claim 1, characterized in that: The drive control circuit also includes a third diode and a fourth diode; The anode of the third diode is connected to the main control terminal of the control chip, and the cathode of the third diode is used to connect to the lighting module; The anode of the fourth diode is connected to the second end of the latch circuit, and the cathode of the fourth diode is used to connect to the lighting module.

8. A lighting circuit, characterized in that: Comprising a lighting module and a driving control circuit according to any one of claims 1 to 7; The lighting module is connected to the control chip and is used to work based on the main control signal; The lighting module is connected to the second end of the latch circuit and is used to maintain a working state based on a latch control signal output by the latch circuit.

9. A lamp, characterized in that: The lighting circuit comprises the lighting circuit described in claim 8.

10. A vehicle, characterized in that: A lamp comprising the lamp described in claim 9.

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