CN201035128Y - Dummy load circuit system - Google Patents

Abstract

The utility model provides a dummy load circuit system, it includes voltage source, luminescence unit, detection circuit and dummy load circuit, and it mainly constitutes the dummy load circuit with the tungsten filament subassembly and replaces traditional matching resistance subassembly. The dummy load circuit consumes energy to meet the preset current amount detected by the detection circuit, the temperature generated by the current passing through the tungsten wire assembly is easy to isolate, and the tungsten wire assembly has lower cost and lighter weight compared with the traditional matching resistor assembly, so that the load circuit device can meet the requirements of being applied to the automobile environment better.

Description

Dummy Load Circuitry

technical field

The utility model relates to a vehicle detection and display system, especially a dummy load circuit system therein.

Background technique

In order to enable the driver to know the status of the vehicle in real time while driving, the current automobile will be equipped with a vehicle detection and display system 1 as shown in Figure 1. The system 1 includes a trip computer 10 and a detection circuit. 11, and the trip computer 10 will display the situation learned by the detection circuit 11 on the dashboard of the car with a light 12. The driver can understand the condition of the current vehicle and take appropriate measures. Therefore, the detection circuit 11 is connected to each interior component 13 in the vehicle body. In this way, it is detected whether each of the components 13 fails.

Early cars may not have a trip computer as shown in Figure 1. The detection circuit will provide a slower blinking frequency of the direction light when the bulb is normal; and provide a significantly faster blinking frequency when the bulb fails to remind the owner of the vehicle. Lamp failure.

The headlights of traditional cars are generally equipped with customary light bulbs, which are used to project light and warn. But today's auto industry has already replaced conventional light bulbs with high-brightness and low-cost light-emitting diodes, which are used for car light projection and warning.

However, when the traditional detection circuit 11 is used to detect the magnitude of the current to determine whether an automobile component is faulty, when it is used to detect whether the light-emitting diode 2 is normal as the light source of the car lamp, because the light-emitting diode 2 is Low-power products pass very little current. Therefore, when the detection circuit 11 operates, the existence of the light-emitting diode 2 cannot be detected.

Therefore, as shown in FIG. 2 , the LED 2 is generally connected in parallel with a dummy load circuit 3 , and the dummy load circuit 3 generally includes a resistor 4 with a small impedance value. The impedance of the resistor 4 is small, so the current flowing through the resistor 4 is relatively large, which meets the detection condition of the detection circuit 11 . However, the resistor 4 will generate heat and form a high temperature during operation. Therefore, a dummy load circuit that can provide low heat is disclosed in the prior art, which can solve the problem of using the resistor 4 as the dummy load circuit 3 to generate high temperature. The prior art discloses a dummy load circuit composed of a plurality of diodes and a resistor, which can solve the problem of excessive power consumption and high heat generation in traditional dummy load circuits.

However, the above-mentioned dummy load circuit still contains resistor components, which still generate heat due to power loss, and the heat of traditional resistors is dissipated from the surface of the resistor. Difficulty; or by increasing the wattage of the dummy load resistor to disperse the heat, which invisibly causes the overall cost and weight of the dummy load to increase.

Contents of the invention

Therefore, the purpose of this utility model is to provide a new type of dummy load circuit system, which uses tungsten wire components as a dummy load circuit, and makes the consumption of the dummy load circuit conform to the preset current amount detected by the detection circuit, and The amount of current makes it easy to isolate the temperature generated by the tungsten wire assembly itself. At the same time, the tungsten wire assembly itself is low in cost and light in weight, so that the dummy load circuit system can better meet the requirements of the automotive environment.

For reaching above object, the technical scheme that the utility model adopts is:

A dummy load circuit system, characterized in that the dummy load circuit system includes:

Voltage source, light emitting unit, detection circuit and dummy load circuit. Wherein, the light-emitting unit is composed of a plurality of light-emitting diodes electrically connected, and is electrically connected with the voltage source;

Wherein, the detection circuit is electrically connected to the voltage source and the light-emitting unit, and is used to detect and judge whether the light-emitting unit has an abnormal state;

Wherein, the dummy load circuit includes at least one tungsten wire assembly connected in parallel with the light emitting unit and electrically connected with the voltage source;

Wherein: the tungsten wire assembly of the dummy load circuit has a matching circuit in series, and the matching circuit is electrically connected to the voltage source;

Wherein: the matching circuit is a step-down circuit;

Wherein: the matching circuit is a boost circuit;

Wherein: the matching circuit is a current limiting circuit.

Via the above description, it can be known that the utility model has the advantages that:

The dummy load circuit system of the utility model uses a tungsten wire assembly as a dummy load circuit, and makes the consumption of the dummy load circuit conform to the preset current amount detected by the detection circuit, and the amount of current makes the tungsten wire assembly itself The generated temperature is easy to isolate, and the tungsten wire component itself is low in cost and light in weight, so that the dummy load circuit system can better meet the requirements of the application in the automotive environment.

Description of drawings

FIG. 1 is a schematic diagram of a conventional vehicle detection and display system installed in an automobile;

Fig. 2 is a known circuit block diagram, illustrating that a dummy load circuit is connected in parallel next to the light-emitting diode;

Fig. 3 is a circuit block diagram of the dummy load circuit system of the present invention, illustrating the first embodiment of the dummy load circuit system of the present invention;

Fig. 4 is the equivalent circuit schematic diagram of Fig. 3, illustrates the circuit characteristic of dummy load circuit;

Fig. 5 is a circuit block diagram of the dummy load circuit system of the present invention, illustrating the second embodiment of the dummy load circuit system of the present invention;

Fig. 6 is a circuit block diagram of the dummy load circuit system of the present invention, illustrating the third embodiment of the dummy load circuit system of the present invention;

Fig. 7 is a circuit block diagram of the dummy load circuit system of the present invention, illustrating the fourth embodiment of the dummy load circuit system of the present invention;

FIG. 8 is a circuit block diagram of the dummy load circuit system of the present invention, illustrating the fifth embodiment of the dummy load circuit system of the present invention.

Explanation of reference numerals: vehicle detection and display system 1; trip computer 10; detection circuit 11; lamp signal 12; in-vehicle components 13; light-emitting diode 2; dummy load circuit 3; resistor 4; voltage source 5; light-emitting unit 6; dummy load circuit 7; matching circuit 71; diode 710; tungsten wire assembly 72; boost circuit 73; current limiting circuit 74; detection circuit 8.

Detailed ways

With regard to the technical means of the present utility model, a number of preferred embodiments are described in detail below in conjunction with the drawings, for in-depth understanding and approval of the utility model.

Please refer to FIG. 3 , which is a schematic diagram of the first embodiment of the dummy load circuit system of the present invention. In this example, the dummy load circuit is electrically connected to the built-in detection circuit 8 of the car body. The dummy load circuit system includes a voltage source 5, a light emitting unit 6 and a dummy load circuit 7, wherein:

The voltage source 5 is the battery of the car body.

The light-emitting unit 6 is composed of a plurality of light-emitting diodes electrically connected, and is electrically connected to the voltage source 5 and the detection circuit 8, and the other end of the light-emitting unit 6 is electrically connected to the ground terminal. .

The dummy load circuit 7 is connected in parallel with the light-emitting unit 6 and is electrically connected to the voltage source 5. The dummy load circuit 7 includes a matching circuit composed of a plurality of diodes connected in series and has a step-down effect. circuit 71, and a tungsten wire assembly 72 connected in series with the matching circuit 71, and the other end of the tungsten wire assembly 72 is electrically connected to the ground. The tungsten filament assembly 72 can be a kind of tungsten filament bulb. If yes, the dummy load circuit system is constructed.

First, the circuit characteristics of the aforementioned dummy load circuit 7 will be described here, that is, if the dummy load circuit 7 is the matching circuit 71 composed of twelve diodes 710 connected in series, and the matching circuit 71 is connected in series with the matching circuit 71 The above-mentioned tungsten wire assembly 72 is composed (as shown in FIG. 4 ). The tungsten filament assembly 72 is a tungsten filament bulb with an electrical specification of 12 volts and 21 watts. When the light-emitting unit 6 is in an off state due to damage, if the voltage source 5 is 12 volts and is electrically connected to the dummy load circuit 7, the voltage drop in the matching circuit 71 is about 3.5 volts, And make the tungsten filament bulb produce weak light, at this moment, the current consumption of the tungsten filament bulb is only about 0.3 ampere, then the current consumption of the dummy load circuit 7 is about 0.3 ampere. If the same matching circuit 71 is connected in series with the tungsten bulb with a lower wattage specification, it can be concluded that the current consumption of the dummy load circuit 7 is smaller. Therefore, when the dummy load device is in use, the dummy load circuit 7 can choose to connect at least two sets of dummy load circuits 7 in parallel with the light emitting unit 6 according to the size of the preset detection current value of the detection circuit 8, or choose a specification The tungsten bulb with a lower wattage is used to meet the condition of the preset detection current value of the detection circuit 8 .

When the light-emitting unit 6 is in an open circuit state due to damage in use, the dummy load circuit 7 will consume a certain amount of current, and the amount of current is sufficient for the detection circuit 8 to detect and judge the current. The light-emitting unit 6 is currently in an off state, and the detection circuit 8 will execute a preset action program. Because the tungsten filament bulb is easy to install, and the heat generated by the tungsten filament bulb is concentrated on the surface of the glass bulb, it is not easy to conduct to other places through the installation place, but the heat can be effectively isolated, and the tungsten filament bulb itself is expensive. Inexpensive, light weight, more in line with the requirements of the automotive environment.

Please refer to FIG. 5 , which is a schematic diagram of the second embodiment of the dummy load circuit system of the present invention. In this example, the dummy load circuit is electrically connected to the built-in detection circuit 8 of the car body. The dummy load circuit system includes a voltage source 5, a light emitting unit 6 and a dummy load circuit 7, wherein:

The voltage source 5 is the battery of the car body.

The light-emitting unit 6 is composed of a plurality of light-emitting diodes electrically connected, and is electrically connected to the voltage source 5 and the detection circuit 8, and the other end of the light-emitting unit 6 is electrically connected to the ground terminal. connect.

The dummy load circuit 7 is connected in parallel with the light emitting unit 6 and electrically connected to the voltage source 5. The dummy load circuit 7 is composed of four tungsten wire assemblies 72 in series, and the tungsten wire assemblies 72 are A tungsten filament light bulb with electrical specifications of 12 volts, 21 watts.

When the light-emitting unit 6 is in an open circuit state due to its damage in use, and the voltage source 5 is in a 12-volt state, each tungsten wire assembly 72 bears a voltage drop of about 3 volts, thereby causing the The current of the wire assembly 72 is relatively small, which is equivalent to reducing the voltage of the tungsten wire assembly 72 to control it from generating high temperature, and the current is sufficient for the detection circuit 8 to detect and judge. Knowing that the light-emitting unit 6 is currently in an off state, the detection circuit 8 will execute a preset action program.

Please refer to FIG. 6 , which is a schematic diagram of the third embodiment of the dummy load circuit system of the present invention. In this example, the dummy load circuit is electrically connected to the built-in detection circuit 8 of the car body. The dummy load circuit system includes a voltage source 5, a light emitting unit 6 and a dummy load circuit 7, wherein:

The voltage source 5 is the battery of the car body.

The light-emitting unit 6 is composed of a plurality of light-emitting diodes electrically connected, and is electrically connected to the voltage source 5 and the detection circuit 8, and the other end of the light-emitting unit 6 is electrically connected to the ground terminal. connect.

The dummy load circuit 7 is connected in parallel with the light emitting unit 6 and is electrically connected to the voltage source 5. The dummy load circuit 7 is composed of two tungsten wire assemblies 72 connected in series, and the tungsten wire assembly 72 It is a tungsten filament bulb with an electrical specification of 24 volts and 21 watts.

When the light-emitting unit 6 is in an open circuit state due to its damage in use, and the voltage source 5 is in a 12-volt state, each tungsten wire assembly 72 bears a voltage drop of about 6 volts, and then the tungsten filaments flowing through the tungsten The current of the wire assembly 72 is relatively small, which is equivalent to using the tungsten wire assembly 72 to reduce the voltage, and the current consumed by the dummy load circuit 7 is sufficient for the detection circuit 8 to detect and determine the The light-emitting unit 6 is currently in an off state, and the detection circuit 8 will execute a preset action program.

Please refer to FIG. 7 , which is a schematic diagram of the fourth embodiment of the dummy load circuit system of the present invention. In this example, the dummy load circuit is electrically connected to the built-in detection circuit 8 of the car body. The dummy load circuit system includes a voltage source 5, a light emitting unit 6 and a dummy load circuit 7, wherein:

The voltage source 5 is the battery of the car body.

The light-emitting unit 6 is composed of a plurality of light-emitting diodes electrically connected, and is electrically connected to the voltage source 5 and the detection circuit 8, and the other end of the light-emitting unit 6 is electrically connected to the ground terminal. .

The dummy load circuit 7 is connected in parallel with the light-emitting unit 6 and is electrically connected to the voltage source 5. The dummy load circuit 7 is composed of a boost circuit 73 electrically connected to a tungsten wire assembly 72, and the The tungsten filament assembly 72 is a tungsten filament bulb with an electrical specification of 110 volts and 30 watts.

When the light-emitting unit 6 is in an open circuit state due to its damage in use, and the voltage source 5 is in a state of 12 volts, after the booster circuit 73 raises the voltage to 36 volts, the tungsten wire assembly 72 Withstand a voltage drop of 36 volts, so that the amount of current flowing through the tungsten wire assembly 72 is small, and the amount of current consumed by the dummy load circuit 7 is sufficient for the detection circuit 8 to detect and judge that the The light-emitting unit 6 is currently in an off state, and the detection circuit 8 will execute a preset action program.

Please refer to FIG. 8 , which is a schematic diagram of a fifth embodiment of the dummy load circuit system of the present invention. In this example, the dummy load circuit is electrically connected to the built-in detection circuit 8 of the car body. The dummy load circuit system includes a voltage source 5, a light emitting unit 6 and a dummy load circuit 7, wherein:

The voltage source 5 is the battery of the car body.

The light-emitting unit 6 is composed of a plurality of light-emitting diodes electrically connected, and is electrically connected to the voltage source 5 and the detection circuit 8, and the other end of the light-emitting unit 6 is electrically connected to the ground terminal. .

The dummy load circuit 7 is connected in parallel with the light emitting unit 6 and is electrically connected to the voltage source 5. The dummy load circuit 7 is composed of a current limiting circuit 74 and a tungsten wire assembly 72 connected in series, and the The tungsten filament assembly 72 is a tungsten filament bulb with an electrical specification of 110 volts and 30 watts.

When the light-emitting unit 6 is in an open circuit state due to its damage in use, and the voltage source 5 is in a 12 volt state, the voltage will output a preset current through the current limiting circuit, so that the tungsten that flows through the tungsten The current of the wire assembly 72 is small, and the current consumed by the dummy load circuit 7 is enough for the detection circuit 8 to detect and judge that the light emitting unit 6 is currently in an open circuit state, then the detection circuit 8 The preset action program will be executed.

Via the above description, it can be known that the utility model has the advantages that:

The dummy load circuit system of the utility model uses a tungsten wire assembly as a dummy load circuit, and makes the consumption of the dummy load circuit conform to the preset current amount detected by the detection circuit, and the amount of current makes the tungsten wire assembly itself The generated temperature is easy to isolate, and the tungsten wire component itself is low in cost and light in weight, so that the dummy load circuit system can better meet the requirements of the application in the automotive environment.

The above description is only illustrative, rather than restrictive, of the present utility model. Those of ordinary skill in the art understand that many modifications, changes or equivalents can be made without departing from the spirit and scope defined in the claims. But all will fall within the limitable scope of the claims of the present utility model.

Claims (4)

1. A kind of dummy load circuit system, it is characterized in that, described dummy load circuit system comprises: power source; A light-emitting unit, which is composed of a plurality of light-emitting diodes electrically connected, and is electrically connected to the voltage source; A detection circuit, which is electrically connected to the voltage source and the light-emitting unit, and is used to detect and judge whether the light-emitting unit has an abnormal state; The dummy load circuit includes at least one tungsten wire assembly and a matching circuit connected in series with the tungsten wire assembly, so that the dummy load circuit is connected in parallel with the light emitting unit and electrically connected with the voltage source. 2. The preload circuit system as claimed in claim 1, wherein the matching circuit is a step-down circuit. 3. The preload circuit system of claim 1, wherein the matching circuit is a boost circuit. 4. The preload circuit system of claim 1, wherein the matching circuit is a current limiting circuit.

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