Fault alarm circuit

Abstract

The utility model discloses a fault alarm circuit, which relates to the technical field of photoelectricity and comprises at least two constant current sources, and each constant current source is connected with a first end of a corresponding light-emitting unit. The second end of the light-emitting unit is grounded; the connection point of the constant current source and the first end of the light-emitting unit is connected with the first end of the corresponding alarm unit. The second ends of the alarm units are connected. When part of the light-emitting units corresponding to the constant current sources break down, current of the constant current sources corresponding to the part of the light-emitting units can flow through the corresponding alarm circuits and give an alarm, accurate alarm of each light-emitting unit can be achieved, and due to the fact that the first ends of the alarm units are connected with the connection points of the constant current sources and the corresponding light-emitting units, the light-emitting units can give an alarm accurately. And the second ends of the alarm units are connected, so that the arrangement of the alarm units is simplified.

Description

Technical Field

[0001] The utility model relates to the field of photoelectric technology, in particular to a fault alarm circuit. Background Art

[0002] With the development of the automobile industry, the headlight industry has also entered a period of vigorous development, and its main trend is the rapid development towards LED.

[0003] In order to ensure the reliability of car lights, fault detection of the light circuit has become an indispensable step. The commonly used alarm circuit currently confirms the fault by sampling the voltage of the LED light string. When the LED light string is open, the voltage change is detected and an alarm is issued. However, this circuit requires many additional components. In addition, the alarm may be inaccurate.

[0004] Based on this, a simple and accurate fault alarm circuit is urgently needed to solve the above problems. Utility Model Content

[0005] In view of the above problems, the utility model provides a fault alarm circuit, the specific scheme is as follows:

[0006] A fault alarm circuit, the fault alarm circuit comprising:

[0007] At least two constant current sources, each of which is connected to a first end of a corresponding light emitting unit; and a second end of each light emitting unit is grounded;

[0008] The connection point between the constant current source and the first end of the light emitting unit is connected to the first end of the corresponding alarm unit;

[0009] The second ends of the alarm units are connected;

[0010] Wherein, when some of the light-emitting units fail, the alarm unit connected to the failed light-emitting units generates an alarm.

[0011] Optionally, in the above-mentioned fault alarm circuit, the voltage of the light-emitting unit during normal operation is lower than the voltage of the alarm unit correspondingly connected thereto during operation.

[0012] Optionally, in the above fault alarm circuit, the alarm unit comprises: an alarm element and a circuit protection element connected in parallel with the alarm element;

[0013] The alarm element is used to give an alarm when the light-emitting unit connected thereto fails;

[0014] The circuit protection element is used to protect the normal operation of the circuit when the light-emitting unit connected thereto is normal.

[0015] Optionally, in the above-mentioned fault alarm circuit, the alarm element is an alarm light.

[0016] Optionally, in the above-mentioned fault alarm circuit, the alarm light is an LED light.

[0017] Optionally, in the above-mentioned fault alarm circuit, the circuit protection element is a bidirectional transient voltage regulator diode.

[0018] Optionally, in the above fault alarm circuit, the breakdown voltage of the bidirectional transient voltage regulator diode is 10V.

[0019] Optionally, in the above fault alarm circuit, the light-emitting unit is an LED light string.

[0020] Optionally, in the above fault alarm circuit, the LED light string includes at least two LED lamp beads connected in series.

[0021] Optionally, in the above fault alarm circuit, the fault alarm circuit includes: a first constant current source, a second constant current source, a first light emitting unit, a second light emitting unit, a first alarm unit and a second alarm unit;

[0022] The first constant current source is connected to the first end of the first light-emitting unit, and the connection point is a first connection point; the second end of the first light-emitting unit is grounded;

[0023] The second constant current source is connected to the first end of the second light emitting unit, and the connection point is a second connection point; the second end of the second light emitting unit is grounded;

[0024] The first connection point is connected to the first end of the first alarm unit; the second connection point is connected to the first end of the second alarm unit;

[0025] The second end of the first alarm unit is connected to the second end of the second alarm unit.

[0026] Compared with the prior art, the beneficial effects achieved by the utility model are:

[0027] The utility model provides a fault alarm circuit, which comprises at least two constant current sources, each constant current source is connected to the first end of the light emitting unit corresponding to it; the second end of the light emitting unit is grounded; the connection point between the constant current source and the first end of the light emitting unit is connected to the first end of the alarm unit corresponding to it; the second ends of the alarm units are connected; wherein, when the light emitting units corresponding to some constant current sources fail, the current of the corresponding constant current source will flow through the corresponding alarm circuit and alarm, so that accurate alarm of each light emitting unit can be realized, and because the first end of the alarm unit is connected to the connection point between the constant current source and the corresponding light emitting unit, and the second ends of the alarm units are connected, the setting of the alarm unit is simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other features, advantages and aspects of the embodiments of the present disclosure will become more apparent with reference to the following detailed description in conjunction with the accompanying drawings. Throughout the accompanying drawings, the same or similar reference numerals represent the same or similar elements. It should be understood that the drawings are schematic and the originals and elements are not necessarily drawn to scale.

[0029] Figure 1 A structural schematic diagram of a fault alarm circuit provided in this application;

[0030] Figure 2 A schematic diagram of the circuit structure of an alarm unit provided in an embodiment of the present application;

[0031] Figure 3 A schematic diagram of a circuit structure of a light-emitting unit provided in an embodiment of the present application;

[0032] Figure 4 A structural schematic diagram of another fault alarm circuit provided in an embodiment of the present application;

[0033] Figure 5 A structural schematic diagram of another fault alarm circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0035] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] refer to Figure 1 , Figure 1 A schematic diagram of a fault alarm circuit provided in the present application, wherein the fault alarm circuit comprises:

[0037] At least two constant current sources 01, each of which is connected to a first end 02a of a corresponding light emitting unit 02; and a second end 02b of the light emitting unit 02 is grounded.

[0038] A connection point C between the constant current source 01 and the first end 02 a of the light emitting unit 02 is connected to a first end 03 a of the corresponding alarm unit 03 .

[0039] The second ends 03b of the alarm units 03 are connected.

[0040] When part of the light-emitting units 02 fails, the alarm unit 03 corresponding to the failed light-emitting units 02 generates an alarm.

[0041] Specifically, the fault alarm circuit includes at least two constant current sources 01, that is, three, four or more constant current sources 01, which are not specifically limited here and can be set as needed. Each constant current source 01 is connected to the first end 02a of the corresponding light-emitting unit 02, and the second end 02b of the light-emitting unit 02 is grounded. When the light-emitting unit 02 does not fail, the current output by the constant current source 01 flows through the light-emitting unit 02 and is output from the second end 02b of the light-emitting unit 02 to form a loop.

[0042] The connection point C between the constant current source 01 and the first end 02a of the light-emitting unit 02 is connected to the first end 03a of the corresponding alarm unit 03. When multiple constant current sources 01 are provided, there will be multiple light-emitting units 02 and alarm units 03 of the same number. Each light-emitting unit 02 is connected to a corresponding alarm unit 03. When some light-emitting units 02 fail, the current output by the constant current source 01 connected thereto will flow through the alarm unit 03 correspondingly connected to the failed light-emitting unit 02 and give an alarm, thereby achieving an accurate alarm when the light-emitting unit 02 fails. The second ends 03b of the alarm units 03 are connected to each other, so that the setting of the alarm unit 03 is simpler and the cost is reduced.

[0043] Optionally, in another embodiment of the present application, the voltage of the light emitting unit 02 during normal operation is lower than the voltage of the alarm unit 03 corresponding thereto during operation.

[0044] Specifically, since the constant current source 01 will flow through the circuit with the smallest load voltage in the circuit to which it is connected and clamp the voltage value at the voltage value of the circuit, when the light-emitting unit 02 has no faults, in order for the light-emitting unit 02 to operate normally, the voltage required for the normal operation of the light-emitting unit 02 must be lower than the voltage of the alarm unit 03 connected thereto when it is operating, so as to ensure that the light-emitting unit 02 can emit light normally when there is no fault.

[0045] Optional, reference Figure 2 , Figure 2 A schematic diagram of the circuit structure of an alarm unit provided in an embodiment of the present application; in another embodiment of the present application, the alarm unit 03 includes: an alarm element 031 and a circuit protection element 032 connected in parallel with the alarm element 031.

[0046] The alarm element 031 is used to generate an alarm when the light emitting unit 02 connected thereto fails.

[0047] The circuit protection element 032 is used to protect the normal operation of the circuit when the light-emitting unit 02 connected thereto is normal.

[0048] Optionally, in another embodiment of the present application, the alarm element 032 is an alarm light.

[0049] Optionally, in another embodiment of the present application, the warning light is an LED light.

[0050] Optionally, in another embodiment of the present application, the circuit protection element 031 is a bidirectional transient voltage regulator diode.

[0051] Optionally, in another embodiment of the present application, the breakdown voltage of the bidirectional transient voltage regulator diode is 10V.

[0052] Specifically, the alarm unit 03 includes an alarm element 031 and a circuit protection element 032 connected in parallel with the alarm element 031. The alarm element 031 can give an alarm when the light-emitting unit 02 connected thereto fails. It should be noted that the alarm element 031 in the present application includes but is not limited to an alarm lamp, and can also be other alarm devices. In the present embodiment, the alarm lamp can be set to observe the fault alarm more intuitively, thereby simplifying the fault alarm circuit. The alarm lamp in the present application includes but is not limited to an LED lamp, and can also be other lamps. The circuit protection element 032 includes but is not limited to a bidirectional transient voltage regulator diode. The breakdown voltage of the bidirectional transient voltage regulator diode can be 10V. At this time, the breakdown voltage is relatively large. When the light-emitting unit 02 does not fail, it can ensure that the current of the constant current source 01 flows through the circuit where the light-emitting unit 02 is located, thereby ensuring the normal operation of the circuit.

[0053] Optional, reference Figure 3 , Figure 3 A schematic diagram of the circuit structure of a light-emitting unit provided in an embodiment of the present application; in another embodiment of the present application, the light-emitting unit 02 is an LED light string.

[0054] Optionally, in another embodiment of the present application, the LED light string includes at least two LED lamp beads connected in series.

[0055] Specifically, the light emitting unit 02 may include but is not limited to an LED light string. When the light emitting unit 02 is an LED light string, it includes at least two LED lamp beads connected in series. It should be noted that in this embodiment, the light emitting unit 02 may be a car lamp, and is not specifically limited.

[0056] Based on the above fault alarm circuit, the present application provides an embodiment for illustration. Figure 4 , Figure 4A structural diagram of another fault alarm circuit provided in an embodiment of the present application; in another embodiment of the present application, the fault alarm circuit includes:

[0057] A first constant current source 01A, a second constant current source 01B, a first light emitting unit 02A, a second light emitting unit 02B, a first alarm unit 03A and a second alarm unit 03B.

[0058] The first constant current source 01A is connected to the first end 02a of the first light emitting unit 02A, and the connection point is a first connection point C1; the second end 02b of the first light emitting unit 02A is grounded.

[0059] The second constant current source 01B is connected to the first end 02a of the second light emitting unit 02B, and the connection point is a second connection point C2; the second end 02b of the second light emitting unit 02B is grounded.

[0060] The first connection point C1 is connected to the first end 03a of the first alarm unit 03A; the second connection point C2 is connected to the first end 03a of the second alarm unit 03B.

[0061] The second end 03b of the first alarm unit 03A is connected to the second end 03b of the second alarm unit 03B.

[0062] Specifically, in this embodiment, the first light-emitting unit 02A is two LED lamp beads connected in series, including LED3 and LED4, the second light-emitting unit 02B is two LED lamp beads connected in series, including LED5 and LED6, the first alarm unit 03A includes a bidirectional transient voltage regulator diode TVS1 and an alarm light LED1 arranged in parallel, and the second alarm unit 03B includes a bidirectional transient voltage regulator diode TVS2 and an alarm light LED2 arranged in parallel. The forward voltage drop of the LED lamp is 3V, and the breakdown voltage of the bidirectional transient voltage regulator diode TVS1 and the bidirectional transient voltage regulator diode TVS2 is 10V.

[0063] When LED3 and LED4 in the first light-emitting unit 02A, and LED5 and LED6 in the second light-emitting unit 02B are normally lit, due to the characteristics of the constant current source, the current of the constant current source 01A flows through LED3 and LED4 in the first light-emitting unit 02A, clamping the voltage at 6V, and the current of the constant current source 01B flows through LED5 and LED6 in the second light-emitting unit 02B, clamping the voltage at 6V. At this time, the voltage is too small to break down the bidirectional transient voltage regulator diode, so LED1 and LED2 are turned off.

[0064] When LED3 or LED4 in the first light-emitting unit 02A fails to open circuit, the current of the constant current source 01A flows through LED1, TVS2, LED5 and LED6, the loop voltage reaches 19V, and the bidirectional transient voltage regulator diode TVS1 reaches the breakdown voltage, at which time LED1 lights up to alarm.

[0065] When LED5 or LED6 in the second light-emitting unit 02B fails to open circuit, the current of the constant current source 01B flows through LED2, TVS1, LED3 and LED4, the loop voltage reaches 19V, and the bidirectional transient voltage regulator diode TVS2 reaches the breakdown voltage, at which time LED2 lights up to alarm.

[0066] It should be noted that when there are more light-emitting units 02, more alarm units 03 can be added. For example, when there are three light-emitting units 02, refer to Figure 5 , Figure 5 A structural diagram of another fault alarm circuit provided in an embodiment of the present application; in this way, the open circuit fault detection of each light-emitting power source 02 can be realized according to the above-mentioned fault detection method. The alarm unit 02 is set in each channel to realize the accurate alarm of each light-emitting unit 02. And setting the circuit in this way can reduce the component settings in the alarm circuit and reduce the cost. It should be noted that when all the light-emitting units 02 have open circuit faults, the alarm detection cannot be realized, but this situation generally does not occur. As long as there is a constant current source 01 corresponding to the light-emitting unit 02 that is normal, the alarm detection of the light-emitting units 02 corresponding to other constant current sources 01 can be realized. It should also be noted that the above-mentioned LED lamp, bidirectional transient voltage regulator diode and constant current source are all existing components, and there is no improvement in any method.

[0067] The above is a detailed introduction to a fault alarm circuit provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiments is only used to help understand the method and core idea of ​​the utility model; at the same time, for general technical personnel in this field, according to the idea of ​​the utility model, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the utility model.

[0068] It should be noted that each embodiment in this specification focuses on the differences from other embodiments, and the same or similar parts between the embodiments can be referenced to each other.

[0069] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device that includes a series of elements is inherent to the elements, or also includes elements inherent to these processes, methods, articles or devices. In the absence of further restrictions, the elements defined by the sentence "including a..." do not exclude the presence of other identical elements in the process, method, article or device that includes the elements.

[0070] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A fault alarm circuit, characterized in that: The fault alarm circuit comprises: At least two constant current sources, each of which is connected to a first end of a corresponding light emitting unit; and a second end of each light emitting unit is grounded; The connection point between the constant current source and the first end of the light emitting unit is connected to the first end of the corresponding alarm unit; The second ends of the alarm units are connected; Wherein, when some of the light-emitting units fail, the alarm unit connected to the failed light-emitting units generates an alarm.

2. The fault alarm circuit according to claim 1, characterized in that: The voltage of the light-emitting unit during normal operation is lower than the voltage of the alarm unit correspondingly connected thereto during operation.

3. The fault alarm circuit according to claim 1, characterized in that: The alarm unit comprises: an alarm element and a circuit protection element connected in parallel with the alarm element; The alarm element is used to give an alarm when the light-emitting unit connected thereto fails; The circuit protection element is used to protect the normal operation of the circuit when the light-emitting unit connected thereto is normal.

4. The fault alarm circuit according to claim 3, characterized in that: The alarm element is an alarm light.

5. The fault alarm circuit according to claim 4, characterized in that: The warning light is an LED light.

6. The fault alarm circuit according to claim 3, characterized in that: The circuit protection element is a bidirectional transient voltage regulator diode.

7. The fault alarm circuit according to claim 6, characterized in that: The breakdown voltage of the bidirectional transient voltage regulator diode is 10V.

8. The fault alarm circuit according to claim 1, characterized in that: The light emitting unit is an LED light string.

9. The fault alarm circuit according to claim 8, characterized in that: The LED light string comprises at least two LED lamp beads connected in series.

10. The fault alarm circuit according to claim 1, characterized in that: The fault alarm circuit comprises: a first constant current source, a second constant current source, a first light emitting unit, a second light emitting unit, a first alarm unit and a second alarm unit; The first constant current source is connected to the first end of the first light-emitting unit, and the connection point is a first connection point; the second end of the first light-emitting unit is grounded; The second constant current source is connected to the first end of the second light emitting unit, and the connection point is a second connection point; the second end of the second light emitting unit is grounded; The first connection point is connected to the first end of the first alarm unit; the second connection point is connected to the first end of the second alarm unit; The second end of the first alarm unit is connected to the second end of the second alarm unit.

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