CN219999636U - Constant-current voltage-reducing driving power supply for car lamp and car - Google Patents
Constant-current voltage-reducing driving power supply for car lamp and car Download PDFInfo
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- CN219999636U CN219999636U CN202321480955.2U CN202321480955U CN219999636U CN 219999636 U CN219999636 U CN 219999636U CN 202321480955 U CN202321480955 U CN 202321480955U CN 219999636 U CN219999636 U CN 219999636U
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Abstract
The utility model belongs to the technical field of constant current sources, and particularly relates to a constant current and voltage reduction driving power supply for a car lamp and a car. It comprises the following steps: the low beam constant current regulating circuit is electrically connected with the low beam level signal conversion circuit; the high beam constant current regulating circuit is electrically connected with the high beam level signal conversion circuit; and the sampling end of the constant current source control circuit is electrically connected with the sampling control end of the low beam constant current regulating circuit through the sampling circuit control circuit, and the feedback end of the constant current source control circuit is electrically connected with the feedback control ends of the low beam constant current regulating circuit and the high beam constant current regulating circuit through a switching tube T1 respectively. The constant-current and voltage-reducing driving power supply for the headlight can supply power to the running light, the dipped headlight and the high beam by using one LED constant-current and voltage-reducing driving power supply, so that the headlight assembly can work normally by sharing one DC12-80V power supply. In particular, the DC-DC converter is not needed to be additionally arranged in the electric motor car and the electric vehicle.
Description
Technical Field
The utility model belongs to the technical field of constant current sources, and particularly relates to a constant current and voltage reduction driving power supply for a car lamp and a car.
Background
At present, the control circuit of the vehicle headlight is difficult to be produced in a large scale because various versions of different power supply voltages and control voltages are required for production and manufacture of headlight manufacturers.
For a host factory (vehicle manufacturer), circuits such as a DC-DC converter and a headlight control module are required to be designed. Vehicle development designers also need to consider whether the power of the converter and the headlamp control module is sufficient to use a brighter headlamp when developing a new vehicle model. Particularly for after-market repair shops, it is often necessary to consider intermediate converters and headlight control modules to detect and determine the fault range.
Based on the above problems, it is necessary to design a constant current and voltage reduction driving power supply for a car lamp, which can solve the constant current power supply problem of a running lamp, a dipped headlight and a high beam, and is a technical problem in the art that needs to be solved.
Disclosure of Invention
In order to solve the technical problems in the background art, the utility model provides a constant-current voltage-reducing driving power supply for a car lamp and a car.
In order to solve the technical problems, the utility model provides a constant-current and voltage-reducing driving power supply for a car lamp, which comprises the following components:
the low beam constant current regulating circuit is electrically connected with the low beam level signal conversion circuit;
the high beam constant current regulating circuit is electrically connected with the high beam level signal conversion circuit;
and the sampling end of the constant current source control circuit is electrically connected with the sampling control end of the low beam constant current regulating circuit through the sampling circuit control circuit, and the feedback end of the constant current source control circuit is electrically connected with the feedback control ends of the low beam constant current regulating circuit and the high beam constant current regulating circuit through a switching tube T1 respectively.
Further, the far-beam level signal conversion circuit has the same structure as the low-beam level signal conversion circuit, and comprises a composite amplifying circuit formed by two triodes and an output triode driven by the composite amplifying circuit; wherein the method comprises the steps of
The collector of the output triode of the high beam level signal conversion circuit controls the switching tube V1 in the high beam constant current regulation circuit to be conducted or closed, and when the switching tube V1 is conducted, the source of the switching tube V1 is used as a feedback control end to control the switching tube T1 to be conducted so as to pull the level of the feedback end down, and the output current of the constant current source control circuit is increased.
Further, the collector electrode of the output triode of the low beam level signal conversion circuit controls the switching tube V2 in the low beam constant current regulation circuit to be conducted or closed, and when the switching tube V2 is conducted, the source electrode of the switching tube V2 is used as a feedback control end to control the switching tube T1 to be conducted so as to pull the level of the feedback end down, and the output current of the constant current source control circuit is increased; and
the low beam constant current regulating circuit further comprises: and the collector of the switching tube T8 is used as a sampling control end to be electrically connected with the grid electrode of the switching tube V3 in the sampling circuit control circuit, and the switching tube T8 is triggered to be conducted when the switching tube V2 is conducted, so that the conduction of the switching tube T8 changes the sampling resistance value, and the output current of the constant current source control circuit is increased.
Further, the constant-current step-down driving power supply of the car lamp further comprises: the driving signal access end is connected with the power supply end of the constant current source control circuit through the current limiting resistor R1.
Further, a diode is connected between collectors of two output triodes of the far and near light level signal conversion circuit, so that when the far light level signal conversion circuit outputs a high level, a switching tube V2 of the near light constant current regulation circuit is driven to be conducted through the diode.
Further, the constant current source control circuit adopts a constant current chip LN2516.
Further, the constant-current step-down driving power supply of the car lamp further comprises:
and the constant voltage input end is connected with the constant voltage power supply circuit for the low beam level signal conversion circuit, the low beam constant current regulation circuit, the high beam level signal conversion circuit and the high beam constant current regulation circuit and is used for supplying power to the driving lamp.
On the other hand, the utility model also provides a vehicle, which comprises the constant-current and voltage-reducing driving power supply for the vehicle lamp.
The constant-current and voltage-reducing driving power supply for the headlight has the beneficial effects that the headlight can supply power to the running headlight, the dipped headlight and the high beam by using one LED constant-current and voltage-reducing driving power supply, so that the headlight assembly can work normally by sharing one DC12-80V power supply. In particular, the DC-DC converter is not needed to be additionally arranged in the electric motor car and the electric vehicle.
Additional features and advantages of the utility model will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model. The objectives and other advantages of the utility model will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
In order to make the above objects, features and advantages of the present utility model more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic circuit diagram of a constant current step-down driving power supply for a vehicle lamp according to the present utility model;
description of the embodiments
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1, the present embodiment provides a constant current step-down driving power supply for a vehicle lamp, including:
the low beam constant current regulating circuit is electrically connected with the low beam level signal conversion circuit; the high beam constant current regulating circuit is electrically connected with the high beam level signal conversion circuit; and the sampling end of the constant current source control circuit is electrically connected with the sampling control end of the low beam constant current regulating circuit through the sampling circuit control circuit, and the feedback end FB of the constant current source control circuit is electrically connected with the feedback control ends of the low beam constant current regulating circuit and the high beam constant current regulating circuit through a switching tube T1 respectively.
In the embodiment, the far-beam level signal conversion circuit has the same structure as the low-beam level signal conversion circuit and comprises a composite amplifying circuit formed by two triodes, specifically, in the low-beam level signal conversion circuit, the two triodes are a triode T4 and a triode T5 respectively, in the far-beam level signal conversion circuit, the two triodes are a triode T2 and a triode T3 respectively, and an output triode driven by the composite amplifying circuit, in the low-beam level signal conversion circuit, a triode T7 is output, and in the far-beam level signal conversion circuit, a triode T6 is output; the collector of the output triode T6 of the high beam level signal conversion circuit controls the switching tube V1 in the high beam constant current regulation circuit to be conducted or closed, and when the switching tube V1 is conducted, the source of the switching tube V1 is used as a feedback control end to control the switching tube T1 to be conducted so as to pull the level of the feedback end FB down, and the output current of the constant current source control circuit is increased.
In this embodiment, the collector of the output triode of the low beam level signal conversion circuit controls the switching tube V2 in the low beam constant current regulation circuit to be turned on or off, and when the switching tube V2 is turned on, the source of the switching tube V2 is used as a feedback control end to control the switching tube T1 to be turned on so as to pull the level of the feedback end FB down, so that the output current of the constant current source control circuit is increased; and the low-beam constant-current adjusting circuit further includes: the collector of the switching tube T8 is used as a sampling control end to be electrically connected with the grid electrode of a switching tube V3 in the sampling circuit control circuit, and the switching tube T8 is triggered to be conducted when the switching tube V2 is conducted, so that the switching tube T8 is conducted to change the sampling resistance value, and the output current of the constant current source control circuit is increased; specifically, the resistor Rd is connected into the circuit and connected with the resistor Rx in parallel, so that the sampling resistance value is changed.
In this embodiment, the constant current step-down driving power supply for the vehicle lamp further includes: the driving signal access end is connected with the power supply end of the constant current source control circuit through the current limiting resistor R1. Specifically, the driving signal access terminal can access (10-80V and less than 5 mA) control signals.
In this embodiment, a diode D3 is connected between collectors of two output triodes of the low-beam and high-beam level signal conversion circuit, and when the high-beam level signal conversion circuit outputs a high level, the switching tube V2 of the low-beam constant current regulation circuit is driven to be turned on by the diode by utilizing unidirectional conductivity of the diode D3.
In this embodiment, the constant current source control circuit uses a constant current chip LN2516, and in some embodiments, the feedback terminal FB corresponds to MODE.
In this embodiment, the constant current step-down driving power supply for the vehicle lamp further includes: the constant voltage input end, namely the power supply end, is specifically connected with a power supply 10-80V, and is connected with a constant voltage to supply power for the low beam level signal conversion circuit, the low beam constant current regulation circuit, the high beam level signal conversion circuit, the high beam constant current regulation circuit and the driving lamp.
The working process of each part of circuit in the constant-current step-down driving power supply of the car lamp comprises the following steps:
in the following embodiments, the switching transistor may be a triode or a MOS transistor.
The low beam level signal conversion circuit or the high beam level signal conversion circuit in fig. 1 can realize fusion conversion of different input voltage signals. The control voltage (DC 10-80V) can be provided by a mechanical switch, and the control module of the external large lamp is not needed when the control voltage is used on the lithium-ion power assisted bicycle by the high level (3-5V) of the IO port of the singlechip. Specifically, when a lower high-level signal (for example, 3-5v high level output by an I/O port of a singlechip) is input at a high beam end, the triode T2 and the triode T3 form a composite amplifying circuit. The signal is amplified and then drives the output triode T6 to output a constant current signal, and simultaneously drives the MOS tube V1 below the light emitting diode Hi1 and the light emitting diode Hi2 and the MOS tube V2 below the light emitting diode L01 and the light emitting diode LO2 to be conducted, so that four LEDs are simultaneously turned on to be in a high beam state. After the switch tube V2 is conducted and the switch tube T8 is saturated and conducted, the MOS tube V3 is saturated and conducted, the resistor Rd is connected to increase the current of the lamp loop, the switch tube T1 is conducted to lower the potential of the FB port of the chip LN2516, and the current of the lamp loop is doubled by the chip control, so that the current requirement when the high beam is lighted is met; or transistor T2 is saturated directly when the signal level is high (e.g., 8-80v mechanical switching signal), and transistor T3 is also saturated to drive output transistor T6. The working mode is that the output triode T6 outputs a constant current signal and simultaneously drives the MOS tube V1 below the light emitting diode Hi1 and the light emitting diode Hi2 to be conducted with the MOS tube V1 below the light emitting diode L01 and the light emitting diode LO2, after the switch tube T8 is saturated and conducted, the switch tube V3 is saturated and conducted, the circuit current of the lamp loop is increased by the access resistor Rd, the potential of the FB port of the chip LN2516 is pulled down by the conduction of the switch tube T1, and the current of the circuit of the lamp is doubled by the chip control, so that the current requirement when the high beam is lighted is met.
The constant current source control circuit part of fig. 1 changes the lamp loop current according to the turn-on of different lamps, and is implemented by the MOS transistor V3 according to the gate signal thereof. When only the running light is turned on, the lamp loop current is determined by the resistor Rx on the graph, where the current is small. When the MOS tube V2 for controlling the low beam is conducted, the switch tube T8 is conducted to provide a constant current to control the MOS tube V2 to conduct by the grid signal of the MOS tube V2 when the low beam is started, and after the switch tube T8 is saturated to conduct, the MOS tube V3 is saturated to conduct and the switch-in resistor Rd increases the loop current of the lamp.
In the low beam constant current regulating circuit part shown in fig. 1, the light emitting diode L01 and the light emitting diode L02 are turned on, and the turn-on signal of the MOS tube V3 is provided to increase the lamp current.
The high beam constant current regulating circuit part in fig. 1 is that a switching tube T1 of a light emitting diode Hi1 and a light emitting diode Hi2 which are lighted (the low beam is driven simultaneously when the high beam is lighted) is turned on to pull the FB port potential of a chip LN2516 low, and the current of a chip control lamp loop is doubled.
Current control sequence: the resistor Rx determines the minimum current of a loop when the driving lamp is started, the MOS tube V2 is conducted to the resistor Rd when the low beam is started to enlarge the loop current to meet the working current of the driving lamp and the low beam, the MOS tube V2 is conducted to the resistor Rd when the high beam is started to enlarge the loop current, and meanwhile, the level of the port of the chip FB is pulled down through the conduction of the switching tube T1 to further double the current so as to meet the current required by the simultaneous lighting of the driving lamp, the low beam and the high beam.
The resistor RXC to the left of the running light of fig. 1 is the current that the lamp adjusts when the low beam or high beam is on.
In some embodiments, the constant-current and voltage-reducing driving power supply of the car lamp can be widely used for motorcycles, electric vehicles, lithium-ion power-assisted bicycles and electric vehicles.
The embodiment also provides a vehicle, which comprises the constant-current and voltage-reduction driving power supply for the vehicle lamp so as to provide corresponding working currents for the dipped headlight, the high beam and the driving lamp.
In summary, an LED constant-current step-down driving power supply supplies constant current to the driving lamp, the dipped headlight and the high beam, so that the headlight assembly can work normally by sharing one DC12-80V power supply. The DC-DC converter is not needed to be additionally arranged on the electric motor car and the electric motor car. The control can be that a mechanical switch provides control voltage (DC 10-80V) or high level (3-5V) of an IO port of a singlechip is used on the lithium-ion power assisted bicycle without an external large lamp control module.
Material costs (without the need for a DC-DC converter and a headlight control module) can be saved for the host plant (vehicle manufacturer). Let vehicle development designer also need not consider when developing the new motorcycle type that converter and headlight control module's power is enough to use brighter headlight, the same version only need be purchased to the headlight.
Trouble shooting time can be saved for a vehicle repair shop engaged in after-sales maintenance (a vehicle employing the headlight of the present technology only needs to check if the switch and the headlight are faulty if the headlight is faulty, and does not need to consider an intermediate converter and a headlight control module).
With the above-described preferred embodiments according to the present utility model as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present utility model. The technical scope of the present utility model is not limited to the description, but must be determined according to the scope of claims.
Claims (8)
1. A constant current step-down driving power supply for a vehicle lamp, comprising:
the low beam constant current regulating circuit is electrically connected with the low beam level signal conversion circuit;
the high beam constant current regulating circuit is electrically connected with the high beam level signal conversion circuit;
and the sampling end of the constant current source control circuit is electrically connected with the sampling control end of the low beam constant current regulating circuit through the sampling circuit control circuit, and the feedback end of the constant current source control circuit is electrically connected with the feedback control ends of the low beam constant current regulating circuit and the high beam constant current regulating circuit through a switching tube T1 respectively.
2. The constant current step-down driving power supply for a vehicle lamp according to claim 1, wherein,
the high beam level signal conversion circuit and the low beam level signal conversion circuit have the same structure and comprise a composite amplifying circuit formed by two triodes and an output triode driven by the composite amplifying circuit; wherein the method comprises the steps of
The collector of the output triode of the high beam level signal conversion circuit controls the switching tube V1 in the high beam constant current regulation circuit to be conducted or closed, and when the switching tube V1 is conducted, the source of the switching tube V1 is used as a feedback control end to control the switching tube T1 to be conducted so as to pull the level of the feedback end down, and the output current of the constant current source control circuit is increased.
3. The constant current step-down driving power supply for a vehicle lamp according to claim 2, wherein,
the collector electrode of the output triode of the low beam level signal conversion circuit controls the switching tube V2 in the low beam constant current regulation circuit to be conducted or closed, and when the switching tube V2 is conducted, the source electrode of the switching tube V2 is used as a feedback control end to control the switching tube T1 to be conducted so as to pull the level of the feedback end down and increase the output current of the constant current source control circuit; and
the low beam constant current regulating circuit further comprises: and the collector of the switching tube T8 is used as a sampling control end to be electrically connected with the grid electrode of the switching tube V3 in the sampling circuit control circuit, and the switching tube T8 is triggered to be conducted when the switching tube V2 is conducted, so that the conduction of the switching tube T8 changes the sampling resistance value, and the output current of the constant current source control circuit is increased.
4. The lamp constant current step-down driving power supply according to claim 1, further comprising: the driving signal access end is connected with the power supply end of the constant current source control circuit through the current limiting resistor R1.
5. The constant current step-down driving power supply for a vehicle lamp according to claim 3, wherein,
the diode is connected between the collectors of the two output triodes of the far and near light level signal conversion circuit, so that when the far light level signal conversion circuit outputs high level, the switching tube V2 of the near light constant current regulation circuit is driven to be conducted through the diode.
6. The constant current step-down driving power supply for a vehicle lamp according to claim 1, wherein,
the constant current source control circuit adopts a constant current chip LN2516.
7. The lamp constant current step-down driving power supply according to claim 1, further comprising:
and the constant voltage input end is connected with the constant voltage power supply circuit for the low beam level signal conversion circuit, the low beam constant current regulation circuit, the high beam level signal conversion circuit and the high beam constant current regulation circuit and is used for supplying power to the driving lamp.
8. A vehicle comprising the lamp constant current step-down driving power supply according to any one of claims 1 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321480955.2U CN219999636U (en) | 2023-06-12 | 2023-06-12 | Constant-current voltage-reducing driving power supply for car lamp and car |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321480955.2U CN219999636U (en) | 2023-06-12 | 2023-06-12 | Constant-current voltage-reducing driving power supply for car lamp and car |
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| CN219999636U true CN219999636U (en) | 2023-11-10 |
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| CN202321480955.2U Active CN219999636U (en) | 2023-06-12 | 2023-06-12 | Constant-current voltage-reducing driving power supply for car lamp and car |
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| CN (1) | CN219999636U (en) |
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- 2023-06-12 CN CN202321480955.2U patent/CN219999636U/en active Active
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