Lamp lighting circuit for vehicle, lighting device, and control method for lighting circuit
A technology of LED lamps and lighting circuits, which is applied in the layout of electric lamp circuits, lighting devices, signaling devices, etc., can solve the problems of high price of switching devices and increase the manufacturing cost of lighting circuits for automotive LED lamps, so as to suppress wrong lighting and reduce manufacturing. cost effect
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no. 1 approach
[0070] The vehicle LED lamp lighting circuit 100 according to the first embodiment controls the lighting of an LED lamp mounted on a vehicle (not shown) such as a two-wheeled vehicle ( figure 1 ). also, figure 1 The example shown is a state where the reference node TB is not connected to the first and second nodes T1 and T2 in the switching device SW.
[0071] The automotive LED lamp lighting circuit 100 includes: a first resistor R1, one end of which is connected to the power line VCC, and the other end is connected to the first contact T1; the first LED lamp L1, one end of which is connected to the reference node TB, Its other end is connected with the second contact T2 and the ground wire GND; Forming electrical conduction (connected due to the resistance of water) and passing the leakage current switching device) SW between them, controlling the current flowing through the first LED lamp L1.
[0072] The vehicle LED lamp lighting circuit 100 is mounted, for example, o...
no. 2 approach
[0102] In the second embodiment of the present invention, another configuration example of the LED lamp lighting circuit for vehicles will be described.
[0103] The vehicle LED lamp lighting circuit 200 according to the second embodiment controls the lighting of an LED lamp mounted on a vehicle (not shown) such as a motorcycle (not shown) as in the first embodiment ( Figure 5 ). also, Figure 5 The example shown is a state where the reference node TB is not connected to the first and second nodes T1 and T2 in the switching device SW. in addition, Figure 5 neutralize figure 1 The same symbols indicate the same configuration as that of the first embodiment.
[0104] The automotive LED lamp lighting circuit 200 includes ( Figure 5 ): the first resistor R1, one end of which is connected to the power line VCC, and the other end is connected to the first contact T1; the first LED lamp L1, one end of which is connected to the reference node TB, and the other end is connecte...
no. 3 approach
[0135] In the first embodiment described above, even if the first state in which the switching device SW conducts between the reference node TB and the first contact T1, and the second state in which the reference node TB conducts with the second contact T2 Switching is performed, and as long as the leakage current does not flow, no current flows at the second contact T2. In this case, when the metal on the surface of the second contact T2 is oxidized or adhered by an insulator, insulation failure may occur in the second contact T2.
[0136] Here, in the third embodiment, the vehicle in which the second contact point can be suppressed from being oxidized and insulated by causing a current to flow through the second contact point of the switchgear can be suppressed. The configuration of the LED lamp lighting circuit will be described.
[0137] The vehicle LED lamp lighting circuit 300 according to the third embodiment controls the lighting of an LED lamp mounted on a vehicle (...
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