TWI434619B - Control system with overload protection mechanism - Google Patents

Description

Light control system with overload protection mechanism

The invention relates to a lamp control system, in particular to a lamp control system provided with an overload detection circuit, wherein the lamp control system can be used in the case where the lamp of the vehicle is replaced with a lamp exceeding a standard wattage The overload detection circuit immediately detects an abnormality in the current and terminates the current delivered to the luminaire to ensure that the user uses the luminaire specified by the manufacturer.

In order to increase the illumination range of the locomotive to improve the safety of the rider, the locomotives have adopted the design of symmetrical headlights (ie double-headlights), the current of which is provided by the battery, therefore, Extend the service life of the battery of the locomotive, and ensure that the battery can fully provide the current required for locomotive start-up or headlight illumination. The locomotive has a small generator to drive the generator at the same time when the locomotive engine runs at high speed. In order to generate electric current, the battery is charged. In addition, in order to ensure that the locomotive is running in a dark environment, the headlight can obtain sufficient current to generate sufficient illumination brightness in a safe travel range, and the operator will design a design in the locomotive. Charge control mechanism to charge the battery only under certain conditions. Currently, the more commonly used recharge control mechanisms can be divided into the following two types:

(1) Recharging: When the rider turns on the headlight to drive the locomotive, the control mechanism can supply the current generated by the generator completely (eg, 100%) to the headlight, so that the headlight produces a safe range of travel. Sufficient brightness required inside, the control mechanism only determines that the locomotive has decelerated or stopped traveling according to the vehicle signal generated by the driver after the rider presses the locomotive handle of the locomotive. Since the locomotive engine is still running, the control mechanism will split a part of the current generated by the generator (eg, 70%), and after filtering and boosting the part of the current, Then, the part of the current is supplied to the battery to perform a "returning charge" to the battery. In this way, the "returning and charging" control mechanism can not only make the headlight still produce a certain degree of illumination brightness when the locomotive brakes down or stops traveling, but also can use the partial current generated by the generator to perform the battery. Charging to ensure that the battery will always have sufficient power to start the locomotive; and

(2) Set value recharge: When the rider turns on the headlight to drive the locomotive, the control mechanism controls the recharge function according to the rotational speed (RPM) of the locomotive engine, wherein the control mechanism determines that the rotational speed of the locomotive engine exceeds A speed threshold (eg 2100RPM) indicates that the locomotive is currently in a high-speed state of travel. The control mechanism supplies the current generated by the generator to the headlights completely (eg, 100%), so that the headlights can be generated. Sufficient brightness required for safe travel to meet the rider's safety on the road; conversely, when the control mechanism determines that the locomotive engine's speed is lower than the speed threshold, it indicates that the locomotive is currently at low speed or idle. State, the control mechanism will only output 30% of the current generated by the generator to the headlight, and divide the remaining 70% of the current, and filter 70% of the current, boost and other related processing procedures, and then The battery is supplied to the battery for "set value recharge". In this way, the "set value recharge" control mechanism can also cause the headlight to still generate a predetermined brightness when the locomotive is traveling at a low speed or idle state, and can use the remaining current to charge the battery to ensure that the battery has enough to start the locomotive. Ample power.

In addition, through the aforementioned recharge control mechanism, especially the set value recharge control mechanism, it is more effective and accurate to achieve the purpose of charging the battery under the premise of safe lighting, so as to avoid the headlights of the locomotive at low speed or idle speed. Brightness wastes the power generated by the generator unnecessarily or unnecessarily consumes the amount of electricity stored in the battery. Generally speaking, when designing a locomotive, the manufacturer will carefully plan the locomotive's overall performance, power consumption, etc., and will match the appropriate battery and standard wattage (eg 12V, 35W). Luminaires (such as headlights) enable the luminaire not only to perform good and safe lighting performance, but also to make the battery have a long service life, but some users tend to have personal factors such as fashion or unconventional, and will be on the locomotive. The luminaire is modified and replaced with a standard wattage lamp with a high wattage (eg 12V, 60W), so that if the locomotive originally used a standard wattage luminaire, it only costs 2.91 amps (A The current will be changed to a high wattage luminaire, which will consume 5 amps of current, making the luminaire's current consumption exceeds the expectations of the operator, which in turn causes additional consumption of electricity in the battery, which can easily lead to battery storage. The problem of insufficient quantity not only makes the battery storage capacity unable to start the locomotive, but also causes the memory effect caused by the battery being unfilled for a long time, which greatly shortens the battery life. In addition, since the high wattage lamp consumes a relatively high current, a higher temperature is generated. Therefore, the control circuit of the lamp corresponding to the high wattage is also subjected to a temperature exceeding a desired temperature for a long time. It is prone to burnout or short circuit, which not only causes the control circuit to malfunction, but also seriously affects the user's driving safety.

The aforementioned current overload condition is even more serious in the design of symmetrical headlamps. After all, when more and more standard wattage lamps are replaced with high wattage lamps, the lamps will cost much more than the manufacturer. The expected current is only in the field of current locomotives, and has not yet designed a good solution for the overload situation. However, in the field of liquid crystal display panels, it is possible to find a panel manufacturer who has designed an application for a discharge lamp with abnormal load. The protection circuit in the discharge lamp driving device, but in particular, the circuit described later can not be directly used on the locomotive, and the technical fields of the two are also different, and the following description only describes the circuit. The technical concept, and some of the technical concepts can be cited in the technical field of locomotives.

Referring to FIG. 1 , the discharge lamp driving device 1 includes a control unit 11 , two switching elements 12 and 13 (eg, an N-channel enhancement MOSFET), two transformers 14 and 15 , and a protection circuit 16 . The DRV1 terminal and the DRV2 terminal of the control unit 11 are respectively connected to the gates of the switching elements 12 and 13, and can output driving signals to the switching elements 12 and 13, and the switching elements 12 and 13 are respectively A drain is connected to the primary side of each of the transformers 14, 15 and a predetermined high frequency voltage can be applied to the primary side of each of the transformers 14, 15 so that the secondary side of each of the transformers 14, 15 can be generated. The high voltage, in addition, the secondary side of each of the transformers 14, 15 is respectively provided with a corresponding connection terminal 141, 142, 151, 152, wherein a discharge lamp 144 is connected between the two connection terminals 141, 142, and the remaining two connection terminals 151 152 are connected to another discharge lamp 154, so that each of the discharge lamps 144, 154 can receive current and emit light.

Referring to FIG. 1 , the protection circuit 16 is respectively connected to the F/B terminal of the control unit 11 , the source of each of the switching elements 12 and 13 , and the transformers 14 and 15 . The secondary side is connected, and the load between the connection terminals 141, 142, 151, 152 can be detected, and a predetermined feedback signal is transmitted to the control unit 11, the protection circuit 16 includes a two-side universal resistor 161, 162, a total current detecting resistor 163, two Zener diodes 164, 165 and a transistor 166, wherein one end of each of the side common resistors 161, 162 is respectively connected to a corresponding connecting terminal 142, 152, The other end is connected to one end of the total current detecting resistor 163, and the common connection point of the side common resistors 161, 162 and the total current detecting resistor 163 is connected to the collector of the transistor 166. And the F/B terminal of the control unit 11, and the other end of the total current detecting resistor 163 is connected to the ground (GND), and the anode of the Zener diodes 164 and 165 Connected to each other and to the base of the transistor 166, the Zener The cathodes of the diodes 164 and 165 are respectively connected to one ends of the side common resistors 161 and 162. Further, the emitter (Emitter) of the transistor 166 and the ground terminal (GND) and each of the switching elements The sources of 12 and 13 are connected.

Referring to FIG. 1 , by the design of the protection circuit 16 described above, when the load between the two connection terminals 141 and 142 is abnormal, such as when a large current flow phenomenon occurs, the corresponding side common resistance 161 and The cathode of the Zener diode 164 can receive the large current. At this time, if the cathode potential of the Zener diode 164 exceeds the Zener potential, the Zener diode 164 is turned on, and The transistor 166 is turned on. At this time, the F/B terminal of the control unit 11 becomes a ground potential, so that the control unit 11 can determine that the current discharge lamp 144 is abnormal, and stops driving the switching elements 12 and 13 respectively. Therefore, the discharge lamps 144, 154 cannot be illuminated. Similarly, when the load between the other connection terminals 151, 152 is abnormal, the discharge lamps 144, 154 cannot be illuminated.

Therefore, how to quote the above technical concept, and design a new structure on the locomotive, in order to solve the problem of luminaire overload, has become an important issue for the current manufacturing and design locomotives.

In view of the current locomotive field, no good solution has been designed for the current overload condition of the luminaire. Therefore, after long-term research and experiment, the inventor finally developed and designed a lamp control system with overload protection mechanism of the present invention. With the advent of the present invention, the aforementioned problems can be effectively solved.

An object of the present invention is to provide a vehicle lamp control system with an overload protection mechanism, which is applied to a vehicle, mainly to prevent the user from replacing the original standard wattage lamp with a high wattage lamp, thereby causing the height. The wattage of the wattage consumes more current than the standard current expected by the operator, which in turn leads to insufficient battery storage and even battery damage. Therefore, the lamp control system of the present invention is composed of at least one luminaire, at least one power component, An overload detecting circuit and a control unit, wherein the control unit is electrically connected to the overload detecting circuit and the power component, and can transmit current to the power component, and the power component and the overload detecting circuit respectively And the lamp is electrically connected, and can transmit current to the lamp, so that the lamp can emit light due to receiving the current, and the overload detecting circuit can detect the current value transmitted by the power component to the lamp, and An overload threshold value is set therein, and when it is judged that the current value is higher than the overload threshold value, a Carrier signal to the control unit, when the control unit receives the overload signal, transmission will be terminated to the current power device, so that the lamp can not be lighted. Thus, once the current value of the high wattage luminaire to the power component exceeds the overload threshold, the control unit automatically terminates the transmission current to the power component, so that the high wattage luminaire cannot be illuminated. Forcing the user to use the standard wattage luminaire according to the manufacturer's specified luminaire specifications, effectively preventing the related electronic components or lines in the lamp control system from being burnt or short-circuited due to excessive current exceeding the overload threshold.

Another object of the present invention is that the lamp control system further includes a wire breakage detection circuit, the wire breakage detection circuit is electrically connected to the power component and the control unit, respectively, and can detect that the power component is transmitted to The current value of the lamp is generated to generate a detection signal. In addition, the control unit has a wire break threshold value, and when it determines that the current value included in the detection signal is lower than the wire break threshold value Next, the control unit terminates the transfer of current to the power component. Thus, when the power component is connected to a plurality of luminaires and one of the luminaires is damaged, the control unit automatically terminates the transmission of current to the power components so that all of the luminaires are not illuminated to avoid A damaged luminaire burns out due to continuous current reception and causes an unexpected problem.

For your convenience, the review committee can make a further understanding and understanding of the purpose, technical features and effects of the present invention. The embodiments are combined with the drawings, and the details are as follows:

In the long-term research and development process of locomotives and other related fields, the inventors found that current users have the behavior of replacing locomotive lamps (such as headlights), and usually replace the standard wattage lamps with high wattage lamps. The overall load of the locomotive is much higher than the original design load of the locomotive, resulting in insufficient battery storage capacity of the locomotive. After a long time, it is easy to cause damage to the battery or related circuits, which makes the operator suffer from the evaluation of the poor quality of the locomotive. The overall structure has been further improved to resolve the above problems, but still has not been properly solved. In view of this, the inventor is thinking about a vehicle lamp control system with an overload protection mechanism to solve the aforementioned problems.

The invention relates to a vehicle lamp control system with an overload protection mechanism, which is applied to a lamp of a vehicle. In a preferred embodiment of the invention, please refer to FIG. 2, the lamp control system 2 comprises a battery. 20. A control unit 21, at least one power component 23 (e.g., MOSFET), an overload detection circuit 25, and at least one luminaire 27, in this embodiment, having two power components 23, and the luminaires 27 The description includes two remote light fixtures 271 and two low-light fixtures 273. However, in particular, the number and names of components used in this embodiment are for convenience only, and are available to the general public or Those skilled in the art will quickly appreciate the essence and gist of the present disclosure, and are not limited to the above-described component styles. The battery 20 can supply current to the various components of the vehicle lamp control system 2 to maintain normal operation of the lamp control system 2, and the control unit 21 is respectively associated with the power components 23 and the overload detection circuit 25. Electrically connected and capable of transmitting current to the power elements 23, in addition, the control unit 21 is still capable of receiving the current engine speed and adjusting the amount of current delivered to the power elements 23, such that when the vehicle is at idle In the state of the control unit 21, the current delivered to the power elements 23 can be reduced, so that the saved current can be recharged into the battery 20 to maintain the service life of the battery 20.

In addition, as shown in FIG. 2, the power components 23 are electrically connected to the overload detecting circuit 25 and the lamps 27, wherein one power component 23 is electrically connected to the headlights 271, and A power component 23 is electrically connected to the near-light fixtures 273. After receiving the current, the power components 23 transmit the current to the corresponding high-light fixture 271 or the low-light fixture 273, so that the high-light fixture 271 Or the near-light lamp 273 can emit light due to receiving the current, and the overload detecting circuit 25 can detect the current value of each of the power elements 23 transmitted to the corresponding headlight lamp 271 or the low-lamp lamp 273, and An overload threshold is provided. When the overload detection circuit 25 determines that the current value exceeds the overload threshold, an overload signal is generated and transmitted to the control unit 21.

As shown in FIG. 2, after receiving the overload signal, the control unit 21 can know that the current current of the high-light lamp 271 or the low-light lamp 273 is too high, and the transmission will be terminated. The current is supplied to the power component 23 such that the luminaire 27 corresponding to the power component 23 cannot be illuminated. Conversely, the control unit 21 continues to deliver current to the power component 23 such that the luminaire 27 corresponding to the power component 23 is continuously illuminated. In this way, when the user replaces the original standard wattage (such as 12V, 35W) with the high-wattage (such as: 12V, 60W) high-light lamps 271, the far-light lamps 271, because each far The lamp 271 needs to consume 5 amps of current. Therefore, the power component 23 transmits 10 amps of current to the lamp 271. At this time, the overload detecting circuit 25 can detect the power component 23. The current is transmitted too much, and an overload signal is generated, and the overload detecting circuit 25 transmits the overload signal to the control unit 21, and the control unit 21 can automatically terminate the transmission current to the power component 23, so that the remote lights Lamp 271 cannot be lit To force the user must specify the lamp according to the manufacturer specifications using standard wattage lamp apparatus 271 is far, therefore, the control system of the present invention through the lamp 2 will be able to achieve the following effects:

(1) Avoiding excessive current consumption due to the high wattage lamp 27, causing the battery 20 of the vehicle to be unable to be recharged for a long time, resulting in insufficient power storage;

(2) to avoid the memory effect caused by the battery 20 being unfilled for a long time, and the service life of the battery 20 is greatly shortened;

(3) Preventing the related electronic components or lines in the lamp control system 2 from being burnt or short-circuited due to excessive current exceeding the overload threshold value.

In order to clearly disclose the foregoing technical means, the relevant circuit of the vehicle lamp control system will be described. The control unit 21 is an integrated circuit (IC), and the power element 23 is an enhanced type of P channel. Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET), because the circuit structure and operation mode are described later, the voltage is taken as an example, but the technology is familiar with the field. People, when it is possible to convert and master the electrical concept of voltage and current, together with Chen Ming. Referring to FIGS. 3 and 4, the overload detecting circuit 25 includes an overload integrated circuit 251 (for example, an IC of the model LM358). The overload integrated circuit 251 is a dual operational amplifier, and the first leg is connected thereto. The fifth pin is connected and can output a signal to the fifth pin; the second leg of the overload integrated circuit 251 can pass through a first resistor R1 and a source and a gate of each of the power components 23 (Gate) Connected to the common contact of the fifth leg and the first leg through a second resistor R2; the third leg of the overload integrated circuit 251 can be connected to a third resistor R3 And receiving the voltage of the third resistor R3 as an input signal; the fourth pin of the overload integrated circuit 251 is connected to the ground; thus, the first resistor R1, the third resistor R3, and the overload integrated circuit 251 The first, second, and third legs can form a first stage operational amplifier circuit to detect the current load voltage of the lamp 27 (i.e., the current value transmitted by each of the power elements 23).

Referring to FIGS. 3 and 4, the sixth leg of the overload integrated circuit 251 is connected to the fourth resistor R4 and the fifth resistor R5, respectively, and can receive a reference voltage; the seventh of the overload integrated circuit 251 The foot is connected to the base of the first transistor Q1 of the NPN type, and can output a signal to the first transistor Q1. The collector of the first transistor Q1 is connected to the control unit. The fifth leg of 21, the emitter (Emitter) is connected to the ground; the eighth leg of the overload integrated circuit 251 is connected to other circuits of the lamp control system 2; thus, the fourth resistor R4, The fifth resistor R5 and the fifth leg of the overload integrated circuit 251 can form a second stage comparison loop; in addition, the seventh leg of the control unit 21 is respectively connected to one of the NPN type second transistors Q2 and NPN. One of the bases of the third transistor Q3, the collector of the second transistor Q2 is connected to the gate of one of the power elements 23, and the emitter is connected to the ground through a switching element U1. The collector of the three transistors Q3 is connected to the gate of the other power component 23, and the emitter is connected through the other switching element U2. A ground terminal, and further, each of the power element 23 of the drain electrode (Drain) respectively connected to the corresponding lamps 27, to provide a current to each of the lamp 27.

As shown in Figures 3 and 4, when the lamp 27 is of a high wattage specification, the overload detecting circuit 25 transmits the voltage of the power component 23 obtained by the first stage operational amplifier circuit. The voltage is transmitted to the comparison loop of the second stage. At this time, the voltage of the fifth pin of the overload integrated circuit 251 is lower than the reference voltage of the sixth pin (ie, it is determined that the current value transmitted by the power component 23 is higher than the overload threshold. The value is such that the seventh pin outputs a signal to the first transistor Q1, so that the first transistor Q1 can be grounded, so that the fifth pin of the control unit 21 can sense the voltage signal to be 0 (ie, receive The overload signal), and the seventh pin outputs a signal to the second transistor Q2 and the third transistor Q3, so that the aforementioned transistors Q2 and Q3 can be grounded, so that the corresponding power component 23 is It is turned off, and current cannot be transmitted to each of the lamps 27 to achieve the effect of turning off the lamps 27.

In addition, due to the European Commission's (Economic Commission for Europe) (ECE) related safety regulations for locomotives, when the locomotive is a symmetrical headlight (ie double-headlight), if one of the headlights is broken At the time of the line, the locomotive must simultaneously stop supplying current to the headlights to improve the safety of the locomotive. Therefore, the vehicular light control system 2 of the present invention can further include a disconnection detecting circuit 26, see Fig. 2 The disconnection detection circuit 26 is electrically connected to the control unit 21 and each of the power components 23, respectively, and can detect that each of the power components 23 is transmitted to the corresponding headlight fixture 271 or the low-light fixture 273. The current value is used to generate a detection signal. Further, the control unit 21 is provided with a wire break threshold (for example, 5 amps). When the lamp 27 of the vehicle is turned on, the control unit 21 determines. When the current value exceeds the wire break threshold, it continuously transmits current to the power component 23, so that the lamp 27 corresponding to the power component 23 is continuously illuminated; when the lamp 27 of the vehicle is turned on, the control Unit 21 When the current value is broken below the wire break threshold, it will terminate the transfer of current to the power component 23, so that the lamp 27 corresponding to the power component 23 cannot be illuminated; thus, when the same set of standard wattages ( For example, when one of the luminaires 27 of the 12V (35W, 35W) luminaire 27 (eg, two high-light luminaires 271) is damaged, since only one luminaire 27 can still be illuminated, the corresponding power component 23 will transmit 2.91 amps. The current is supplied to the lamp 27, and the control unit 21 can determine, by the second detection signal, that the current value of the lamp 27 to the power component 23 is lower than the wire break threshold (eg, 5). Ampere), and automatically terminates the transfer of current to the power component 23, so that the same set of luminaires 27 cannot be illuminated to comply with the relevant safety regulations.

The above is only the preferred embodiment of the present invention, but the scope of the claims of the present invention is not limited thereto, and according to those skilled in the art, according to the technical content disclosed in the present invention, Equivalent changes that are easily considered are within the scope of protection of the invention.

2. . . Headlight control system

20. . . Battery

twenty one. . . control unit

twenty three. . . Power component

25. . . Overload detection circuit

251. . . Overload integrated circuit

26. . . Wire break detection circuit

27. . . Lamp

271. . . High beam light

273. . . Near lamp

R1. . . First resistance

R2. . . Second resistance

R3. . . Third resistance

R4. . . Fourth resistor

R5. . . Fifth resistor

Q1. . . First transistor

Q2. . . Second transistor

Q3. . . Third transistor

U1, U2. . . Switching element

Figure 1 is a circuit diagram of a conventional discharge lamp driving device;

Figure 2 is a block diagram of the circuit hardware of the present invention;

Figure 3 is a schematic diagram of the circuit of the present invention; and

Figure 4 is a schematic diagram of the overload detection circuit of the present invention.

2. . . Headlight control system

20. . . Battery

twenty one. . . control unit

twenty three. . . Power component

25. . . Overload detection circuit

26. . . Wire break detection circuit

27. . . Lamp

271. . . High beam light

273. . . Near lamp

Claims (4)

A vehicle lamp control system with an overload protection mechanism is applied to a vehicle lamp, characterized in that it comprises: at least one power component electrically connected to the lamp and capable of transmitting current to the lamp; an overload detecting circuit And electrically connecting the power component, and detecting a current value transmitted by the power component to the lamp, wherein the overload detection circuit is provided with an overload threshold value, and determining that the current value is higher than the overload threshold In the state of the value, an overload signal is generated; a control unit is electrically connected to the overload detecting circuit and the power component, and can transmit current to the power component, and the control unit receives the overload detecting circuit. In the state of the overload signal, the transmission current is terminated to the power component; and a wire breakage detection circuit is electrically connected to the power component and the control unit, respectively, and can detect The power component transmits a current value to the luminaire, and generates a detection signal, and the control unit has a wire break threshold and receives the detection Number, and determines the current state value comprises within the detection signal is lower than the disconnection threshold value, the control unit terminates the current to the power transmitting element. The vehicle lamp control system of claim 1, wherein the overload detection circuit is provided with an overload integrated circuit, the overload integrated circuit is a dual operational amplifier: the first leg of the overload integrated circuit and the fifth thereof The legs are connected to output a signal to the fifth pin; the second leg of the overload integrated circuit is transmitted through a first resistor and each of the power elements The second leg is connected to the common contact of the fifth leg and the first leg through a second resistor; the third leg of the overload integrated circuit is connected to a third resistor to Receiving the voltage of the third resistor as an input signal; the fourth leg of the overload integrated circuit is connected to the ground; the sixth leg of the overload integrated circuit can receive a reference voltage; and the overload integrated circuit The seventh leg is connected to the control unit through a first transistor; in a state where the voltage of the fifth pin is lower than the reference voltage of the sixth pin, the current value is higher than the overload threshold. The vehicle lamp control system of claim 2, wherein the seventh leg of the overload integrated circuit is connected to a base of the first transistor, and the collector of the first transistor is connected to the control unit, The emitter is connected to the ground. When the voltage of the fifth pin is lower than the reference voltage of the sixth pin, the seventh leg of the overload integrated circuit turns on the first transistor. The lighting control system of claim 3, wherein the control unit is further connected to each of the power components through a second transistor and a third transistor, wherein each of the power components is an enhanced metal oxide half field effect a transistor, the second transistor and the third transistor system are of an NPN type, the bases of the second transistor and the third transistor are respectively connected to the control unit, and the collectors are respectively connected to corresponding power components a gate of the gate, wherein the emitters are respectively connected to the ground, and the source and the gate of each of the power components are respectively connected to the first resistor, and the drains are respectively connected to the corresponding lamps; and the control unit receives the In the state of the overload signal, the control unit forces the second transistor and the third transistor to be grounded, so that each of the power components is It is turned off and cannot deliver current to each of the lamps.