TW201641874A - Vehicle led lamp lighting circuit, vehicle led lamp lighting device, and method for controlling vehicle led lamp lighting circuit - Google Patents

Abstract

This vehicle LED lamp lighting circuit controls lighting of an LED lamp mounted on a vehicle, and is provided with: a first resistor which has one end connected to a power supply line for feeding power supply voltage and has the other end connected to a first contact; a first LED lamp which is formed of at least one first LED element, and which has one end connected to a reference node and has the other end connected to a second contact and a grounded ground wire; and a switching device exposed to water which switches between a first state where the reference node and the first contact have electrical continuity and a second state where the reference node and the second contact have electrical continuity.

Description

Vehicle LED lamp energizing circuit, vehicle LED lamp energizing device, and vehicle LED lamp energizing circuit control method

The invention relates to a LED lamp lighting circuit for a vehicle, a LED lamp lighting device for a vehicle, and a control method for a LED lamp lighting circuit for a vehicle.

In general, LED (Light Emitting Diode) lamps (Lamp) can rely on low-voltage lighting, and have a long life, low power consumption, fast response, and impact resistance compared to incandescent lamps (bulb lamps). The characteristics are small and lightweight. Therefore, the LED lamp can be suitably applied to, for example, a headlight of a vehicle.

For example, there is an LED lamp lighting control device as disclosed in Japanese Laid-Open Patent Publication No. H2014-69694 and No. 5577457. In the conventional LED lighting control device, there is provided a switch device SWa (FIG. 14) for controlling the turning on/off of the LED lamp.

Here, for example, in the lighting circuit of the conventional light bulb, when the switching device SWa that controls the lighting/lighting of the lamp is in the OFF state, the leakage current flows to the switching device SWa. . In this case, the bulb will not be illuminated due to the small leakage current (Fig. 13).

However, in the above-described conventional LED lamp lighting circuit for a vehicle, when the switch device SWa that controls the turning on/off of the LED lamp is exposed to water, the leakage current also flows to the switching device SWa. In this case, even if it leaks The current is small and the LED components will also illuminate, causing the LEDs to illuminate incorrectly (Figure 14).

Therefore, in the conventional LED lamp lighting circuit for a vehicle, by using a switching device having an external circuit for preventing leakage current and a switching device having a waterproof function, erroneous lighting of the LED lamp is suppressed.

However, since such a switching device is expensive, there is a problem that the manufacturing cost of the LED lamp lighting circuit for a vehicle is increased.

Accordingly, it is an object of the present invention to provide a vehicular LED lighting circuit capable of suppressing LED lamp erroneous lighting caused by leakage current flowing to a switch for controlling LED lamp lighting, which can reduce cost.

According to an embodiment of the present invention, a vehicular LED lamp lighting circuit controls lighting of an LED lamp mounted on a vehicle, and includes: a first resistor having one end and a power supply voltage The power line is connected, the other end of which is electrically connected to the first contact; the first LED lamp is composed of at least one or more first LED elements, one end of which is connected to the reference node (Node), and the other end of which is connected to the second node. a ground connection of the contact and the ground connection; and a switching device, a first state that is conductive between the reference node and the first contact, and between the reference node and the second contact Switching between the second states of conduction.

The LED lamp lighting circuit for a vehicle, wherein: the first LED lamp is turned on by switching the switching device to the first state, and the switching device is switched to the In the second state, the one end of the first LED lamp and the other end are at the same potential, thereby turning off the first LED lamp.

The LED lamp lighting circuit for a vehicle, further comprising: a capacitor, one end of which is connected to the reference node, and the other end of which is connected to the second contact, wherein the switching device is Switching to the first state, lighting the first LED lamp while charging the capacitor, and switching the switching device to the second state to cause the first LED lamp to One end is at a compatible potential with the other end such that the first LED lamp is turned off, and at the same time, the capacitor is discharged, and a current flows between the reference node and the second contact.

The LED lamp lighting circuit for a vehicle is characterized in that: the surfaces of the first contact and the second contact are covered with a metal containing Cu (copper) or Al (aluminum).

The LED lamp lighting circuit for a vehicle, further comprising: a second resistor having one end connected to the power line; and a second LED lamp composed of at least one or more second LED elements, One end is connected to the other end of the second resistor, and the other end is connected to the ground line.

The LED lamp lighting circuit for a vehicle is characterized in that: by switching the switching device to the first state, the second LED lamp is turned on, and the first LED lamp is turned on at the same time Turning the second LED lamp into light by switching the switching device to the second state, and simultaneously causing the one end of the first LED lamp to be at the same potential as the other end, thereby The first LED light is turned off.

The LED lamp lighting circuit for a vehicle is characterized in that: when the switching device encounters water, a leakage current flows between the first contact and the second contact.

The LED lamp lighting circuit for a vehicle, wherein: the first end of the first LED lamp is switched by switching the switching device to the second state even if a leakage current flows to the switching device The other end of the first LED lamp will be at the same potential so that no current flows at the first LED lamp.

The LED lamp lighting circuit for a vehicle, wherein: the value of the leakage current flowing between the first contact and the second contact is greater than a value of the first LED lamp The value of the drive current of the lamp.

The LED lamp lighting circuit for a vehicle is characterized in that: the first state and the second state are switched by an operation of a user.

The vehicular LED lamp lighting circuit is characterized in that: the vehicular LED lamp lighting circuit is mounted on a two-wheeled vehicle, and the first LED lamp and/or the second LED lamp is a head Any one of a head light, a turner, a tail lamp, a position lamp, and a meter illumination, wherein the switch device is for controlling the first A mechanical handle (Handle switch) of the two-wheeled vehicle that is illuminated by an LED lamp.

The vehicular LED lamp lighting circuit is characterized in that: when the switching device encounters water, the first contact and the second contact contact water, so that the first contact and the The second contact is electrically conductive and flows a leakage current.

The LED lamp lighting circuit for a vehicle is characterized in that: the value of the power supply voltage is controlled to a stable value.

The LED lamp lighting circuit for a vehicle, wherein: the first resistor is in the first state, the resistance value is set to be from the power supply line providing the power supply voltage to the first LED The driving current supplied from the lamp becomes a predetermined first predetermined value, and the resistance value of the second resistor is set such that the driving current supplied from the power supply line supplying the power supply voltage to the second LED lamp is preset The second specified value.

The vehicular LED lamp lighting circuit is characterized in that: the one end of the first LED lamp is connected to the anode side of the first LED element, and the other end of the first LED lamp is connected There is a cathode side of the first LED element.

According to an embodiment of the present invention, a vehicular LED lamp lighting device controls lighting of an LED lamp mounted on a vehicle, and includes: a first resistor, one end of which is connected to a power line The other end is electrically connected to the first contact; the first LED lamp is composed of at least one or more first LED elements, one end of which is connected to the reference node, and the other end of which is connected to the second contact and the ground of the ground. a line connection; a switching device, a first state in which a conduction between the reference node and the first contact is performed, and a second state in which a conduction between the reference node and the second contact is performed Switching; and a power supply circuit that supplies a stable supply voltage to the power line.

A method for controlling a LED lamp lighting circuit for a vehicle according to an embodiment of the present invention, wherein the lighting of the LED lamp mounted on the vehicle is controlled, wherein: the first resistor is included, and one end thereof is provided The power supply line is connected to the power line, and the other end is electrically connected to the first contact; the first LED lamp is composed of at least one or more first LED elements, one end of which is connected to the reference node, and the other end of which is connected to the second node. a ground connection of the contact and the ground connection; and a switching device, a first state that is conductive between the reference node and the first contact, and between the reference node and the second contact In the method of controlling the LED lamp lighting circuit for switching between the second states of conduction, the first LED lamp is turned on by switching the switching device to the first state, and the switch is turned on The device switches to the second state such that the one end of the first LED lamp and the other end are at the same potential, thereby causing the first LED to turn off. [Effect of the invention]

According to an embodiment of the present invention, a vehicular LED lamp lighting circuit controls lighting of an LED lamp mounted on a vehicle, and includes: a first resistor having one end and a power cord supplied with a power supply voltage Connected to the other end and connected to the first contact; the first LED lamp is composed of at least one or more first LED elements, one end of which is connected to the reference node TB, and the other end of which is connected with the second contact T2 and The grounded ground wire is connected; and the switching device is in a first state in which the reference node TB is electrically connected to the first contact, and a second state in which the reference node TB is connected to the second contact T2. Switch.

In the LED lamp lighting circuit for a vehicle, when the switching device is switched to the first state, the driving current from the power source line is supplied to the first LED lamp, and the first LED lamp is turned on. On the other hand, by switching the switching device to the second state, the one end of the first LED lamp is short-circuited and becomes the same potential, so that the first LED lamp is turned off.

In this way, for example, when the vehicle LED lighting circuit is applied to a two-wheeled vehicle, when the switching device encounters water and causes leakage current to flow, the LED lamp can be more reliably turned off.

Moreover, when the switching device is in contact with water, even if the leakage current flows between the first contact of the switching device and the second contact T2, by switching the switching device to the second state, one end of the first LED lamp and the other The same potential is at one end so that no current flows at the first LED lamp.

In this way, the switching device does not need to have an external circuit or a waterproof function for preventing leakage current, and a low-cost switching device can be used. Therefore, it is possible to reduce the manufacturing cost of the LED lamp lighting circuit for a vehicle.

Therefore, according to the LED lamp lighting circuit for a vehicle according to the present invention, it is possible to suppress the erroneous lighting of the LED lamp due to the leakage current flowing through the switching device for controlling the lighting of the LED lamp while reducing the manufacturing cost.

Embodiments of the present invention will be described below with reference to the drawings. [First Embodiment]

The vehicle LED lamp lighting circuit 100 according to the first embodiment controls lighting of an LED lamp mounted on a vehicle (not shown) such as a two-wheeled vehicle (FIG. 1). Further, the example shown in FIG. 1 is a state in which the reference node TB is not connected to the first and second contacts T1 and T2 in the switching device SW.

The vehicle LED lighting circuit 100 includes (FIG. 1): a first resistor R1 having one end connected to the power line VCC and the other end connected to the first contact T1; the first LED L1, one end of which is The reference node TB is connected, the other end of which is connected to the second contact T2 and the ground line GND, and the switching device SW controls the current flowing through the first LED lamp L1.

The vehicle lamp lighting circuit 100 is mounted, for example, on a vehicle such as a two-wheeled vehicle.

The power supply line VCC is supplied with a power supply voltage. Further, the value of the power supply voltage is controlled to a stable value.

Ground wire GND is grounded. Further, the potential of the ground is not limited to 0 V, but is set to a fixed potential lower than the power supply voltage at which the LED lamp can be lit.

Further, the first LED lamp L1 is composed of at least one or more first LED elements D1. Further, one end of the first LED lamp L1 is connected to the anode side of the first LED element D1, and the other end of the first LED lamp L1 is connected to the cathode side of the first LED element D1. Further, in the configuration example of Fig. 1, the first LED lamp L1 is formed by connecting two first LED elements D1 in series.

The first LED lamp L1 is, for example, any of a headlight, a turn signal lamp, a tail light, a position light, and a speed indicator of the two-wheeled vehicle.

In addition, a first state (FIG. 2) in which the switching device SW is turned on between the reference node TB and the first contact T1, and a second state (FIG. 3) in conduction between the reference node TB and the second contact T2 Switch. Further, the surfaces of the first contact T1 and the second contact T2 are covered with, for example, a metal containing Cu (copper) or Al (aluminum).

For example, by switching the switching device SW to the first state, the current I1 flows through the first LED lamp L1, and the first LED lamp L1 is turned on (FIG. 3).

The switching device SW switches between the first state and the second state already described, for example, by a user's operation.

The switching device SW is, for example, a mechanical handle switch of the above-described two-wheeled vehicle for controlling the lighting of the first LED lamp L1. Further, the switching device SW has a relatively simple configuration, for example, an external circuit or a waterproof function for preventing leakage current IX.

Therefore, after the switch device SW meets the water, the first contact T1 and the second contact T2 are exposed to water, so that electrical conduction is formed between the first contact T1 and the second contact T2 (connected due to the water resistance RX) And the leakage current IX (Figure 4). In this way, the leakage current IX may flow through the switching device SW.

For example, the value of the leakage current IX flowing between the first contact T1 and the second contact T2 of the switching device SW may be larger than the value of the driving current that can turn on the first LED lamp L1.

At this time, if the leakage current IX flows through the first LED lamp L1, the first LED lamp L1 may be erroneously lit. However, even in a state where the leakage current IX flows in the switching device SW, by switching the switching device SW to the second state, one end and the other end of the first LED lamp L1 become the same potential, so that the first LED lamp L1 No current flows.

That is, it is possible to suppress erroneous lighting of the first LED lamp L1 due to leakage current IX flowing through the switching device SW.

Further, as described above, one end of the first resistor R1 is connected to the power supply line VCC, and the other end is connected to the first contact T1.

In the first state described above, the first resistor R1 is set such that the drive current supplied from the power supply line VCC for supplying the power supply voltage to the first LED lamp L1 becomes a predetermined first predetermined value.

Thus, when the value of the power supply voltage is controlled to a predetermined stable value, by switching the switching device SW to the first state, the first LED lamp L1 is supplied with the drive current of the first predetermined value, thereby An LED lamp L1 is lit with a predetermined brightness.

Next, an example of a method of controlling the vehicle LED lamp lighting circuit 100 having the above configuration will be described.

As already described, for example, the switching device SW is switched by the user's operation to a first state (Fig. 2) in which conduction between the reference node TB and the first contact T1 is made. By this, current flows through the first LED lamp L1, thereby lighting the first LED lamp L1 (Fig. 2).

On the other hand, the switching device SW is switched to the second state (Fig. 3) in which the reference node TB and the second contact T2 are turned on by the user's operation. By this, one end of the first LED lamp L1 becomes the same potential as the other end (that is, no current flows at the first LED lamp L1), thereby turning off the first LED lamp L1 (FIG. 3).

Here, since the switching device SW belonging to the mechanical handle switch is in contact with water, the first contact T1 and the second contact T2 are in contact with water, so that electrical conduction is formed between the first contact T1 and the second contact T2 ( The leakage current IX is connected due to the impedance RX of the water (Fig. 4).

In this case, by switching the switching device SW to the second state, one end of the first LED lamp L1 and the other end have the same potential, so that no current flows at the first LED lamp L1.

That is, it is possible to suppress erroneous lighting of the first LED lamp L1 due to leakage current IX flowing through the switching device SW.

As described above, the LED lamp lighting circuit 100 for a vehicle according to an aspect of the present invention controls the lighting of the LED lamp mounted on the vehicle, and includes: a first resistor R1 having one end and a power supply voltage supplied thereto The power line is connected, the other end of which is connected to the first contact T1; the first LED lamp L1 is composed of at least one or more first LED elements D1, one end of which is connected to the reference node TB, and the other end is connected to the first node The second contact T2 and the grounded ground GND are connected; and the switching device SW is in a first state in which the reference node TB is electrically connected to the first contact T1, and between the reference node TB and the second contact T2 Switching between the second states of conduction.

In the LED lamp lighting circuit for a vehicle, by switching the switching device SW to the first state, the driving current is supplied from the power supply line to the first LED lamp L1, so that the first LED lamp L1 is turned on.

On the other hand, by switching the switching device SW to the second state, the one end and the other end of the first LED lamp L1 are short-circuited and become the same potential, so that the first LED lamp L1 is turned off.

In this way, for example, when the vehicle LED lighting circuit 100 is applied to a vehicle such as a two-wheeled vehicle, when the switching device SW is exposed to water and the leakage current IX flows, the LED lamp can be more reliably turned off.

When the switching device SW is in contact with water, even if the leakage current IX flows between the first contact T1 and the second contact T2 of the switching device SW, the switching device SW is switched to the second state. Thus, one end of the first LED lamp L1 and the other end have the same potential, and no current flows through the first LED lamp L1.

Thus, as described above, the switching device SW does not require an external circuit for preventing the leakage current IX or a waterproof function, so that the low-cost switching device SW can be used. Therefore, it is possible to reduce the manufacturing cost of the LED lamp lighting circuit for a vehicle.

Therefore, according to the LED lamp lighting circuit for a vehicle according to the present embodiment, it is possible to suppress the erroneous lighting of the LED lamp due to the leakage current flowing through the switching device for controlling the lighting of the LED lamp while reducing the manufacturing cost. [Second Embodiment]

In the second embodiment of the present invention, another configuration example of the LED lamp lighting circuit for a vehicle will be described.

The LED lamp lighting circuit 200 for a vehicle according to the second embodiment controls the lighting of the LED lamp mounted on a vehicle (not shown) such as a two-wheeled vehicle as in the first embodiment (FIG. 5). Further, the example shown in FIG. 5 is a state in which the reference node TB is not connected to the first and second contacts T1 and T2 in the switching device SW. In FIG. 5, the same reference numerals as those in FIG. 1 denote the same configurations as those of the first embodiment.

The vehicle LED lighting circuit 200 includes (FIG. 5): a first resistor R1 having one end connected to the power line VCC and the other end connected to the first contact T1; the first LED L1, one end of which is The reference node TB is connected, the other end of which is connected to the second contact T2 and the ground line GND; the switching device SW controls the current flowing through the first LED lamp L1; and the second resistor R2 has one end connected to the power line VCC And a second LED lamp L2 having one end connected to the other end of the second resistor R2 and the other end connected to the ground line GND.

That is, the vehicle LED lamp lighting circuit 200 further includes a second resistor R2 and a second LED lamp L2 as compared with the vehicle LED lamp lighting circuit 100 of the first embodiment shown in FIG. 1 .

The second LED lamp L2 is composed of at least one or more second LED elements D2. Further, one end of the second LED lamp L2 is connected to the anode side of the second LED element D2, and the other end of the second LED lamp L2 is connected to the cathode side of the second LED element D2. Further, in the configuration example of FIG. 5, the second LED lamp L2 is formed by connecting two second LED elements D2 in series.

The second LED lamp L2 is, for example, one of a headlight, a turn signal lamp, a tail light, a position light, and a speed indicator of the two-wheeled vehicle.

Further, the switching device SW is the same as the first embodiment, the first state (FIG. 6) that is electrically connected between the reference node TB and the first contact T1, and the second state that is electrically connected between the reference node TB and the second contact T2. Switch between states (Figure 7).

By switching the switching device SW to the first state, the current I2 flows through the second LED lamp L2, and the second LED lamp L2 is turned on. At the same time, the current I1 flows through the first LED lamp L1, causing the first LED lamp L1 to light up ( Figure 6).

On the other hand, by switching the switching device SW to the second state, the current I2 flows through the second LED lamp L2, and the second LED lamp L2 is turned on, and at the same time, one end of the first LED lamp L1 becomes the same potential as the other end. (ie, no current flows through the first LED lamp L1), thereby turning off the first LED lamp L1 (FIG. 7).

Here, as in the first embodiment, since the switching device SW is in contact with water, the first contact T1 and the second contact T2 are exposed to water, so that electrical conduction is formed between the first contact T1 and the second contact T2 ( The leakage current IX (Fig. 8) flows due to the impedance RX of the water, and as such, the leakage current IX may flow through the switching device SW.

For example, the value of the leakage current IX flowing between the first contact T1 and the second contact T2 of the switching device SW may be larger than the value of the driving current that can turn on the first LED lamp L1.

At this time, if the leakage current IX flows through the first LED lamp L1, the first LED lamp L1 may be erroneously lit. However, even in a state where the leakage current IX flows in the switching device SW, by switching the switching device SW to the second state, one end and the other end of the first LED lamp L1 become the same potential, so that the first LED lamp L1 No current flows.

That is, it is possible to suppress erroneous lighting of the first LED lamp L1 due to leakage current IX flowing through the switching device SW.

Further, as described above, one end of the second resistor R2 is connected to the power supply line VCC, and the other end of the second resistor R2 is connected to one end of the second LED lamp L2.

Further, as in the first embodiment, in the first state described above, the first resistor R1 is set such that the drive current supplied from the power supply line VCC supplying the power supply voltage to the first LED lamp L1 is set in advance. The first specified value.

Thus, when the value of the power supply voltage is controlled to a predetermined stable value, by switching the switching device SW to the first state, the first LED lamp L1 is supplied with the drive current of the first predetermined value, thereby An LED lamp L1 is lit with a predetermined brightness.

Further, the resistance value of the second resistor R2 is set such that the drive current supplied from the power supply line VCC that supplies the power supply voltage to the second LED lamp L2 becomes a second predetermined value that is set in advance.

By doing so, in the case where the value of the power supply voltage is controlled to a predetermined stable value, the second LED lamp L2 is supplied with the second regulation regardless of whether or not the first LED lamp L1 is turned on and whether or not the leakage current IX is present. The value drives the current so that the second LED lamp L2 is lit with a prescribed brightness.

The other configuration of the vehicle LED lamp lighting circuit 200 shown in Fig. 5 is the same as that of the vehicle LED lamp lighting circuit 100 shown in Fig. 1 .

Next, an example of a method of controlling the vehicle LED lamp lighting circuit 200 having the above configuration will be described.

As described above, for example, the switching device SW is switched to a first state in which conduction between the reference node TB and the first contact T1 is performed, for example, by a user's operation (FIG. 6).

Thus, the current I2 flows through the second LED lamp L2, and the second LED lamp L2 is turned on. At the same time, the current I1 flows through the first LED lamp L1, and the first LED lamp L1 is turned on (FIG. 6).

On the other hand, the switching device SW is switched to a second state in which conduction between the reference node TB and the second contact T2 is performed by, for example, a user operation (FIG. 7).

In this way, the current I2 flows through the second LED lamp L2, and the second LED lamp L2 is turned on, and at the same time, one end of the first LED lamp L1 and the other end become the same potential (that is, the current does not flow at the first LED lamp L1). ), thereby turning off the first LED lamp L1 (Fig. 7).

Here, the switch device SW, which is a mechanical handle switch, contacts the water, causing the first contact T1 and the second contact T2 to meet water, so that electrical conduction is formed between the first contact T1 and the second contact T2 (due to The water impedance RX is connected) and the leakage current IX flows (Fig. 8).

In this case, by switching the switching device SW to the second state, one end of the first LED lamp L1 and the other end become the same potential, so that no current flows at the first LED lamp L1.

That is, it is possible to suppress erroneous lighting of the first LED lamp L1 due to leakage current IX flowing through the switching device SW.

The other operation of the vehicle LED lamp lighting circuit 200 is the same as that of the vehicle LED lamp lighting circuit 100 shown in the first embodiment.

In other words, when the vehicle LED lamp lighting circuit 200 is applied to a vehicle such as a two-wheeled vehicle as in the first embodiment, when the switching device SW is exposed to water and the leakage current IX is distributed, the LED lamp can be more reliably Lights off.

When the switching device SW is in contact with water, even if the leakage current IX flows between the first contact T1 and the second contact T2 of the switching device SW, the switching device SW is switched to the second state. Thus, one end of the first LED lamp L1 and the other end have the same potential, and no current flows through the first LED lamp L1.

Thus, as described above, the switching device SW does not require an external circuit for preventing the leakage current IX or a waterproof function, so that the low-cost switching device SW can be used. Therefore, it is possible to reduce the manufacturing cost of the LED lamp lighting circuit for a vehicle.

Therefore, according to the LED lamp lighting circuit for a vehicle according to the present embodiment, it is possible to suppress the erroneous lighting of the LED lamp due to the leakage current flowing through the switching device for controlling the lighting of the LED lamp while reducing the manufacturing cost. [Third embodiment]

In the first embodiment described above, even if the switching device SW is in a first state in which the reference node TB is electrically connected to the first contact T1, and between the second state in which the reference node TB and the second contact T2 are turned on Switching is performed so that no current flows at the second contact T2 as long as the leakage current does not flow. In this case, when the metal on the surface of the second contact T2 is oxidized or adhered by an insulator or the like, the second contact T2 may cause insulation failure.

Here, in the third embodiment, by causing a current to flow through the second contact of the switching device, oxidation of the second contact and adhesion of the insulator are suppressed, and insulation failure of the second contact can be performed. The configuration of the suppressed LED lamp lighting circuit for the vehicle will be described.

Similarly to the first embodiment, the LED lamp lighting circuit 300 for a vehicle according to the third embodiment controls lighting of an LED lamp mounted on a vehicle (not shown) such as a two-wheeled vehicle (FIG. 9). Further, the example shown in FIG. 9 is a state in which the reference node TB is not connected to the first and second contacts T1 and T2 in the switching device SW. In FIG. 9, the same reference numerals as those in FIG. 1 denote the same configurations as those of the first embodiment.

The vehicle LED lighting circuit 300 includes (FIG. 9): a first resistor R1 having one end connected to the power line VCC and the other end connected to the first contact T1; the first LED L1, one end of which is The reference node TB is connected, the other end of which is connected to the second contact T2 and the ground line GND; the switching device SW controls the current flowing through the first LED lamp L1; and the capacitor C1 has one end connected to the reference node TB. The other end of the connection is connected to the second contact T2.

That is, the vehicle LED lighting circuit 300 further includes a capacitor C1 as compared with the vehicle LED lighting circuit 100 of the first embodiment shown in FIG. 1 .

As already described, the capacitor C1 has one end connected to the reference node TB and the other end connected to the second contact T2.

Further, the switching device SW is electrically connected to the first state (FIG. 10) between the reference node TB and the first contact T1, and the second between the reference node TB and the second contact T2, as in the first embodiment. Switch between states (Figure 11). Further, as already described, the surfaces of the first contact T1 and the second contact T2 are covered, for example, by a metal containing Cu (copper) or Al (aluminum).

By switching the switching device SW to the first state, the current I2 flows through the second LED lamp L2, and the second LED lamp L2 is turned on, and the charging current IC flows through the capacitor C1 to charge the capacitor C1 (FIG. 10). At this time, the electric charge accumulated at the capacitor C1 reaches the level of the VF voltage of the first LED element D1 (in the example of FIG. 10, twice the VF voltage).

On the other hand, by switching the switching device SW to the second state, one end of the first LED lamp L1 and the other end become the same potential (that is, the current does not flow at the first LED lamp L1), thereby making the first LED lamp When L1 is turned off, the capacitor C1 is discharged, and the discharge current ID flows between the reference node TB and the second contact T2.

In this way, it is possible to switch to the second frequency at the same frequency as the frequency at which the first LED lamp L1 is switched on and off (that is, the same frequency as the frequency at which the current flows to the first contact T1). The current flows at point T2.

Thus, the acidification of the second contact T2 and the adhesion of the insulator are suppressed, and the insulation failure of the second contact T2 is more reliably suppressed. That is, it is possible to suppress a decrease in the switching performance of the switching device SW.

Further, in order to suppress acidification of the second contact T2 and adhesion of the insulator, the capacitance value of the capacitor C1 is determined based on the value of the discharge current flowing through the switching device SW.

The other configuration of the vehicle LED lamp lighting circuit 300 shown in Fig. 9 is the same as that of the vehicle LED lamp lighting circuit 100 shown in Fig. 1 .

Further, the other operation of the vehicular LED lamp lighting circuit 300 having the above configuration is the same as the operation of the vehicular LED lamp lighting circuit 100 described in the first embodiment.

In other words, when the vehicle LED lamp lighting circuit 300 according to the present embodiment is applied to a vehicle such as a two-wheeled vehicle, the switch device SW can also circulate the leakage current IX when it encounters water. Actually turn off the LED light.

When the switching device SW is in contact with water, even if the leakage current IX flows between the first contact T1 and the second contact T2 of the switching device SW, the switching device SW is switched to the second state. Thus, one end of the first LED lamp L1 and the other end have the same potential, and no current flows through the first LED lamp L1.

Thus, as described above, the switching device SW does not require an external circuit for preventing the leakage current IX or a waterproof function, so that the low-cost switching device SW can be used. Therefore, it is possible to reduce the manufacturing cost of the LED lamp lighting circuit for a vehicle.

Therefore, according to the LED lamp lighting circuit for a vehicle according to the present embodiment, it is possible to suppress the erroneous lighting of the LED lamp due to the leakage current flowing through the switching device for controlling the lighting of the LED lamp while reducing the manufacturing cost.

In the present embodiment, the case where the capacitor C1 is applied to the vehicular LED lamp lighting circuit of the first embodiment has been described. However, the capacitor C1 may be applied to the vehicular LED lamp lighting circuit of the second embodiment. . [Fourth embodiment]

In the first to third embodiments described above, a configuration example in which the power source voltage controlled from the power source line is supplied to the vehicle LED lamp lighting circuit has been described.

In the present embodiment, an example of an LED lamp lighting device including an LED lamp lighting circuit and a power supply circuit will be described.

The LED lamp lighting circuit 400 for a vehicle according to the fourth embodiment controls the lighting of the LED lamp mounted on a vehicle (not shown) such as a two-wheeled vehicle as in the second embodiment (FIG. 12). Further, the example shown in FIG. 12 is a state in which the reference node TB is not connected to the first and second contacts T1 and T2 in the switching device SW. In FIG. 12, the same reference numerals as those in FIG. 5 denote the same configurations as those of the second embodiment.

The vehicle LED lighting circuit 400 includes (FIG. 12): a first resistor R1 having one end connected to the power line VCC and the other end connected to the first contact T1; the first LED L1, one end of which is The reference node TB is connected, the other end of which is connected to the second contact T2 and the ground line GND; the switching device SW controls the current flowing through the first LED lamp L1; and the capacitor C1 has one end connected to the reference node TB. The other end thereof is connected to the second contact T2; and the power supply circuit DS supplies a stable power supply voltage to the power supply line VCC.

That is, the vehicle LED lamp lighting circuit 400 further includes a power supply circuit DS as compared with the vehicle LED lamp lighting circuit 200 of the second embodiment shown in FIG. 5. The power supply circuit DS controls the value of the power supply voltage to a stable value.

Here, as in the second embodiment, in the first state, the first resistor R1 is set such that the drive current supplied from the power supply line VCC supplying the power supply voltage to the first LED lamp L1 is set in advance. The first specified value.

In this way, when the power supply circuit DS controls the value of the power supply voltage to a predetermined stable value, the first LED lamp L1 is supplied with the driving current of the first predetermined value by switching the switching device SW to the first state. Therefore, the first LED lamp L1 is lit with a prescribed brightness.

Further, as in the second embodiment, the resistance value of the second resistor R2 is set such that the drive current supplied from the power supply line VCC that supplies the power supply voltage to the second LED lamp L2 becomes a second predetermined value that is set in advance.

By doing so, in the case where the power supply circuit DS controls the value of the power supply voltage to a predetermined stable value, the second LED lamp L2 is supplied regardless of whether or not the first LED lamp L1 is turned on and whether or not the leakage current IX is present. The drive current of the second predetermined value is described so that the second LED lamp L2 is lit with a predetermined brightness.

The other configuration of the vehicle LED lamp lighting circuit 400 shown in Fig. 12 is the same as that of the vehicle LED lamp lighting circuit 200 shown in Fig. 5 .

Further, the other operation of the vehicular LED lamp lighting circuit 400 having the above configuration is the same as the operation of the vehicular LED lamp lighting circuit 300 shown in the second embodiment.

In other words, when the vehicle LED lamp lighting circuit 400 according to the present embodiment is applied to a vehicle such as a two-wheeled vehicle, the switch device SW can also circulate the leakage current IX when it encounters water. Actually turn off the LED light.

When the switching device SW is in contact with water, even if the leakage current IX flows between the first contact T1 and the second contact T2 of the switching device SW, the switching device SW is switched to the second state. Thus, one end of the first LED lamp L1 and the other end have the same potential, and no current flows through the first LED lamp L1.

Thus, as described above, the switching device SW does not require an external circuit for preventing the leakage current IX or a waterproof function, so that the low-cost switching device SW can be used. Therefore, it is possible to reduce the manufacturing cost of the LED lamp lighting circuit for a vehicle.

Therefore, according to the LED lamp lighting circuit for a vehicle according to the present embodiment, it is possible to suppress the erroneous lighting of the LED lamp due to the leakage current flowing through the switching device for controlling the lighting of the LED lamp while reducing the manufacturing cost.

Further, in the present embodiment, the case where the power supply circuit DS is combined with the vehicle LED lamp lighting circuit of the second embodiment has been described, but the power supply circuit DS and the vehicles of the first and third embodiments may be used. Combined with LED light lighting circuit.

The embodiments of the present invention have been described above, but these embodiments are presented by way of example and are not intended to limit the scope of the invention. The embodiments can be implemented in various other forms, and various omissions, substitutions, and changes can be made without departing from the scope of the invention. The embodiments and the modifications thereof are included in the scope of the invention, and are also included in the scope equivalent to the invention described in the claims.

100‧‧‧Car LED lighting circuit
200‧‧‧Car LED lighting circuit
300‧‧‧Car LED lighting circuit
400‧‧‧Car LED lighting circuit
C1‧‧‧ capacitor
D1‧‧‧First LED component
D2‧‧‧Second LED component
DS‧‧‧Power Circuit
GND‧‧‧ Grounding wire
I1‧‧‧ Current
I2‧‧‧ current
IC‧‧‧Charging current
IX‧‧‧Leakage current
L1‧‧‧First LED light
L2‧‧‧second LED light
R1‧‧‧first resistance
R2‧‧‧second resistance
RX‧‧‧ water impedance
SW‧‧‧ Switchgear
SWa‧‧‧ Switchgear
T1‧‧‧ first joint
T2‧‧‧second joint
TB‧‧‧ benchmark node
VCC‧‧‧ power cord

FIG. 1 is a schematic diagram showing an example of a configuration of a vehicle lamp lamp lighting circuit 100 according to the first embodiment of the present invention. FIG. 2 is a schematic diagram showing an example in which the switching device SW of the vehicular LED lamp lighting circuit 100 shown in FIG. 1 is switched to the first state, and the first LED lamp L1 is turned on. Fig. 3 is a view showing an example of a case where the switching device SW of the vehicular LED lamp lighting circuit 100 shown in Fig. 1 is switched to the second state and the first LED lamp L1 is turned off. 4 is a view showing a state in which the switching device SW of the vehicular LED lamp lighting circuit 100 shown in FIG. 1 is switched to the second state, and when the first LED lamp L1 is turned off, the switching device SW is in contact with water and flows a leak current. An example of a schematic. FIG. 5 is a schematic diagram showing an example of a configuration of a vehicle lamp lamp lighting circuit 200 according to a second embodiment of the present invention. Fig. 6 is a view showing an example of a case where the switching device SW of the vehicular LED lamp lighting circuit 200 shown in Fig. 5 is switched to the first state and the first LED lamp L1 is turned on. Fig. 7 is a view showing an example of a case where the switching device SW of the vehicular LED lamp lighting circuit 200 shown in Fig. 5 is switched to the second state, and the first LED lamp L1 is turned off. 8 is a view showing a state in which the switching device SW of the vehicular LED lamp lighting circuit 200 shown in FIG. 5 is switched to the second state, and when the first LED lamp L1 is turned off, the switching device SW is in contact with water and flows a leak current. An example of a schematic. FIG. 9 is a schematic diagram showing an example of a configuration of a vehicle LED lamp lighting circuit 300 according to a third embodiment of the present invention. FIG. 10 is a schematic diagram showing an example in which the switching device SW of the vehicular LED lamp lighting circuit 300 shown in FIG. 9 is switched to the first state, and the first LED lamp L1 is turned on. FIG. 11 is a view showing an example of a case where the switching device SW of the vehicular LED lamp lighting circuit 300 shown in FIG. 9 is switched to the second state, and the first LED lamp L1 is turned off. FIG. 12 is a schematic diagram showing an example of a configuration of a vehicle LED lamp lighting circuit 400 according to a fourth embodiment of the present invention. FIG. 13 is a schematic view showing an example of a configuration of a conventional incandescent light bulb lighting circuit. FIG. 14 is a schematic view showing an example of a configuration of a conventional LED lamp lighting circuit.

100‧‧‧Car LED lighting circuit

D1‧‧‧First LED component

GND‧‧‧ Grounding wire

L1‧‧‧First LED light

R1‧‧‧first resistance

SW‧‧‧ Switchgear

T1‧‧‧ first joint

T2‧‧‧second joint

TB‧‧‧ benchmark node

VCC‧‧‧ power cord

Claims (15)

A vehicle LED lighting circuit for controlling lighting of an LED lamp mounted on a vehicle, comprising: a first LED lamp, which is composed of at least one or more first LED elements, one end and a reference node Connected, the other end of which is connected to the ground line; and a switching device that conducts between the reference node and the first contact connected to the power line such that current is at the power line and the first LED lamp a first state in which the one end is circulated, and a conduction between the reference node and the second contact connected to the other end of the first LED lamp such that the first LED lamp The one end is at the same potential as the other end of the first LED lamp and switches between a second state in which the power line and the one end of the first LED lamp are blocked. The vehicular LED lamp lighting circuit according to claim 1, wherein: by switching the switching device to the first state, current flows from the power source line to the first LED lamp The first LED lamp is turned on, and the first power supply line and the one end of the first LED light are blocked by switching the switching device to the second state, thereby making the first The LED light is turned off while the one end of the first LED lamp and the other end of the first LED lamp are at the same potential. The LED lamp lighting circuit for a vehicle according to claim 1 or 2, wherein: in the second state, no current flows through the first LED lamp. The LED lamp lighting circuit for a vehicle according to any one of claims 1 to 3, wherein: the reference node is connected only to the one end of the first LED lamp, and/or The second contact is only connected to the other end of the first LED lamp and the ground line. The LED lamp lighting circuit for a vehicle according to any one of claims 1 to 4, wherein: when the switching device encounters water, leakage current is at the first contact and the second Circulation between contacts. The vehicular LED lamp lighting circuit according to claim 5, wherein: the leakage current is circulated to the switching device, and the switching device is switched to the second state, The one end of an LED lamp and the other end of the first LED lamp are at the same potential so that no current flows at the first LED lamp. The vehicular LED lamp lighting circuit according to claim 6, wherein: the value of the leakage current flowing between the first contact and the second contact is greater than The value of the drive current of the first LED lamp lighting. The vehicular LED lamp lighting circuit according to any one of claims 1 to 7, wherein: in the second state, the one end of the first LED lamp and the first LED lamp are The other end is grounded, and the first LED is turned off. The vehicular LED lamp lighting circuit according to claim 5, wherein: the switch device is in contact with water when the water is in contact with the first contact and the second contact, A junction between the junction and the second junction is connected due to the impedance of the water and flows a leakage current. The LED lamp lighting circuit for a vehicle according to claim 1, wherein: the first resistor is connected between the power line and the first contact. The LED lamp lighting circuit for a vehicle according to claim 10, wherein: one end of the first resistor is connected to the power line, and the other end of the first resistor is only the first The contacts are connected. The LED lamp lighting circuit for a vehicle according to any one of claims 1 to 11, wherein: the one end of the first LED lamp is connected to an anode side of the first LED element, The other end of the first LED lamp is connected to the cathode side of the first LED element. The LED lamp lighting circuit for a vehicle according to claim 2, further comprising: a capacitor connected to the reference node at one end and connected to the second contact at the other end, Switching the switching device to the first state, causing a current to flow from the power line to the first LED lamp, thereby charging the capacitor while lighting the first LED lamp, by Switching the switching device to the second state, blocking between the power line and the one end of the first LED lamp, thereby turning off the first LED light while simultaneously making the first The one end of the LED lamp and the other end of the first LED lamp are at the same potential, and the capacitor is discharged while circulating a current between the reference node and the second contact. A LED lamp lighting device for controlling the lighting of an LED lamp mounted on a vehicle, comprising: a first LED lamp, which is composed of at least one or more first LED elements, one end and a reference node Connected, the other end of which is connected to the ground line; a switching device that conducts between the reference node and the first contact connected to the power line and currents in the power line and the first LED lamp a first state circulating between the one ends, and a second connection between the reference node and the second contact connected to the other end of the first LED lamp to enable the first LED lamp The one end is at the same potential as the other end of the first LED lamp, and switches between a second state in which the power line and the one end of the first LED lamp are blocked; A power supply circuit supplies a stable power supply voltage to the power supply line. A control method for a LED lamp lighting circuit for a vehicle, wherein the lighting of the LED lamp mounted on the vehicle is controlled, comprising: a first LED lamp, which is composed of at least one or more first LED elements, one end thereof Connected to the reference node, the other end of which is connected to the ground line; and a switching device that conducts between the reference node and the first contact connected to the power line such that current is in the power line and the first a first state between the one end of an LED lamp and a second state connected to the reference node and the other end of the first LED lamp such that the first The one end of the LED lamp and the other end of the first LED lamp are at the same potential, and a second state between the power line and the one end of the first LED lamp is blocked Switching, wherein, by switching the switching device to the first state, current flows from the power line to the first LED lamp to light the first LED lamp, by switching the switching device to The second state, the power line and the Blocking between the one ends of the first LED lamp to turn off the first LED lamp while simultaneously making the one end of the first LED lamp and the other end of the first LED lamp At the same potential.