CN220440959U - Lamp fault feedback circuit - Google Patents
Lamp fault feedback circuit Download PDFInfo
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- CN220440959U CN220440959U CN202321728475.3U CN202321728475U CN220440959U CN 220440959 U CN220440959 U CN 220440959U CN 202321728475 U CN202321728475 U CN 202321728475U CN 220440959 U CN220440959 U CN 220440959U
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- 238000001514 detection method Methods 0.000 claims abstract description 28
- 238000001914 filtration Methods 0.000 claims abstract description 4
- 230000002265 prevention Effects 0.000 claims abstract description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 239000003990 capacitor Substances 0.000 claims description 7
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The embodiment of the utility model discloses a lamp fault feedback circuit, which comprises: the LED display device comprises a power supply unit, an LED unit, a signal detection unit and a fault feedback unit; the power supply unit is used for providing working voltage, filtering and reverse connection prevention protection for the LED unit; the LED unit is used for being turned on or turned off according to the working voltage; the signal detection unit is used for detecting whether the LED unit works normally or not; and the fault feedback unit is used for feeding back a fault signal to the appointed equipment when the LED unit does not work normally. The circuit of the embodiment of the utility model has simple structure and low cost, can detect faults, and meets the requirement of functional safety.
Description
Technical Field
The utility model relates to the technical field of lamps, in particular to a lamp fault feedback circuit.
Background
At present, driving schemes for LED car lamps in the market comprise three driving modes of linear chips, resistive or triode constant current, and the three driving modes are very mature.
However, the current driving scheme only considers how to normally drive the lamp, but cannot timely process the lamp when the lamp fails, and cannot meet the requirement of functional safety; in the prior art, a singlechip is combined with a peripheral circuit to detect and process faults, but the structure is complex, and the cost is high.
Therefore, it is necessary to design a new circuit, which has a simple structure, low cost, and can detect faults and meet the requirements of functional safety.
Disclosure of Invention
The utility model aims to provide a lamp fault feedback circuit.
In order to solve the technical problems, the aim of the utility model is realized by the following technical scheme: there is provided a luminaire failure feedback circuit comprising: the LED display device comprises a power supply unit, an LED unit, a signal detection unit and a fault feedback unit;
the power supply unit is used for providing working voltage, filtering and reverse connection prevention protection for the LED unit;
the LED unit is used for being turned on or turned off according to the working voltage;
the signal detection unit is used for detecting whether the LED unit works normally or not;
and the fault feedback unit is used for feeding back a fault signal to the appointed equipment when the LED unit does not work normally.
The further technical scheme is as follows: the signal detection unit includes a diode TD2 and a diode TD3.
The further technical scheme is as follows: the fault feedback unit comprises a switch component and a voltage stabilizing tube D2; the switch component is respectively connected with the voltage stabilizing tube D2 and the signal detection unit.
The further technical scheme is as follows: the switch component comprises a triode Q1, a triode Q2, a triode Q3 and a triode Q4, and the signal detection unit is connected with the base electrode of the triode Q3; the emitter of the triode Q2 is connected with the base electrode of the triode Q2; the collector of the triode Q2 is connected with the base of the triode Q1, the collector of the triode Q1 is connected with the base of the triode Q4, and the collector of the triode Q4 is connected with the voltage stabilizing tube D2.
The further technical scheme is as follows: the negative electrode of the voltage stabilizing tube D2 is connected with a resistor R4, the resistor R4 is grounded through a resistor R5, and the resistor R5 is connected with the emitter of the triode Q4.
The further technical scheme is as follows: the positive electrode of the voltage stabilizing tube D2 is connected with the diode D1.
The further technical scheme is as follows: the emitter of the triode Q2 is grounded through a voltage stabilizing tube D3.
The further technical scheme is as follows: the base electrode of the triode Q4 is connected with a divider resistor R1 and a divider resistor R6.
The further technical scheme is as follows: the power supply unit comprises a diode TT1, a filter capacitor TC2 and an anti-reflection diode TD1; the diode TT1 is connected with a power supply, the other end of the diode TT1 is grounded, and the diode TT1 is connected with the filter capacitor TC2 in parallel; the power supply is connected with the LED unit through an anti-reflection diode TD 1.
The further technical scheme is as follows: the LED unit comprises a driving subunit and an LED lamp, wherein the LED lamp is connected with the anti-reflection diode TD1, the driving subunit is connected with the LED lamp, and the signal detection unit is connected with the LED lamp.
Compared with the prior art, the utility model has the beneficial effects that: according to the utility model, the power supply unit, the LED unit, the signal detection unit and the fault feedback unit are arranged, the state of the LED unit is monitored by the signal detection unit, when the LED unit fails, the fault feedback unit is used for feeding back to the appointed equipment, and the combination of the triode, the diode and the voltage stabilizing tube is used for fault detection and feedback, so that the LED power supply device has a simple structure, is low in cost, can detect faults, and meets the requirement of functional safety.
The utility model is further described below with reference to the drawings and specific embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present utility model, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic block diagram of a lamp fault feedback circuit provided by an embodiment of the present utility model;
FIG. 2 is a schematic circuit diagram of a lamp fault feedback circuit according to an embodiment of the present utility model;
the figure identifies the description:
10. a power supply unit; 20. an LED unit; 30. a signal detection unit; 40. and a fault feedback unit.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
It should be understood that the terms "comprises" and "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the utility model herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
Referring to fig. 1, fig. 1 is a schematic block diagram of a lamp fault feedback circuit according to an embodiment of the present utility model, where the circuit can be applied to a lamp that is lighted by all automobile lamp systems, such as a turn signal, and a low-cost control circuit is implemented under the conditions of realizing functions and meeting functional safety and LED faults.
Referring to fig. 1, the lamp fault feedback circuit includes: a power supply unit 10, an LED unit 20, a signal detection unit 30, and a fault feedback unit 40;
a power supply unit 10 for providing an operating voltage, filtering and anti-reverse connection protection for the LED unit 20;
an LED unit 20 for being turned on or off according to an operation voltage;
a signal detection unit 30 for detecting whether the LED unit 20 is operating normally;
the fault feedback unit 40 is used for feeding back a fault signal to the designated equipment when the LED unit 20 is not operating normally.
In the embodiment, when one LED lamp fails, the circuit can realize fault feedback, the circuit is simplified, the change of node voltage when the LEDs in the application loop are broken and the on-off characteristic of the switch tube is utilized, a singlechip and surrounding circuits for controlling in the traditional circuit are canceled, the requirement that the circuit can realize fault feedback when part of LEDs are broken and fail is met, and particularly, the LED car lamp circuit which does not need to realize dynamic effect has strong universality for common lighting effect; the circuit of the embodiment adopts common discrete components to construct the circuit, and has low cost, simple function and strong realizability.
In an embodiment, referring to fig. 2, the signal detection unit 30 includes a diode TD2 and a diode TD3.
In other embodiments, the signal detection unit 30 may further include other diodes, the number of which is related to the number of LED lamps.
In one embodiment, referring to fig. 2, the fault feedback unit 40 includes a switch component and a regulator D2; the switching elements are connected to the voltage regulator D2 and the signal detection unit 30, respectively.
In an embodiment, referring to fig. 2, the switch assembly includes a transistor Q1, a transistor Q2, a transistor Q3, and a transistor Q4, and the signal detecting unit 30 is connected to the base of the transistor Q3; the emitter of the triode Q2 is connected with the base of the triode Q2; the collector of the triode Q2 is connected with the base electrode of the triode Q1, the collector of the triode Q1 is connected with the base electrode of the triode Q4, and the collector of the triode Q4 is connected with the voltage stabilizing tube D2.
In this embodiment, the unidirectional conductivity of the diode and the low level characteristic of the node when the LED is turned off are used in the circuit to form the LED off detection circuit, and the diode is connected in series with the emitter of the triode to clamp the voltage of the base electrode when the triode is turned on, thereby realizing the requirement for the control of the triode region.
In an embodiment, referring to fig. 2, a resistor R4 is connected to the negative electrode of the voltage regulator D2, the resistor R4 is grounded through a resistor R5, and the resistor R5 is connected to the emitter of the transistor Q4.
In an embodiment, referring to fig. 2, the positive electrode of the voltage regulator D2 is connected to the diode D1.
In an embodiment, referring to fig. 2, the emitter of the transistor Q2 is grounded through the voltage regulator D3.
In an embodiment, referring to fig. 2, a base of the transistor Q4 is connected to a voltage dividing resistor R1 and a voltage dividing resistor R6.
In an embodiment, referring to fig. 2, the power unit 10 includes a diode TT1, a filter capacitor TC2, and an anti-reflection diode TD1; the diode TT1 is connected with a power supply, the other end of the diode TT1 is grounded, and the diode TT1 is connected with the filter capacitor TC2 in parallel; the power supply is connected to the LED unit 20 through the anti-reflection diode TD 1.
In the present embodiment, the diode TT1 is a transient spike suppression diode; the filter capacitor TC2 is a ceramic capacitor; the anti-reflection diode TD1 is used for preventing damage to the lamp when the power supply is reversely connected.
In an embodiment, referring to fig. 2, the LED unit 20 includes a driving subunit and an LED lamp, the LED lamp is connected to the anti-reflection diode TD1, the driving subunit is connected to the LED lamp, and the signal detecting unit 30 is connected to the LED lamp.
In this embodiment, the LED lamp is mainly composed of a plurality of LEDs connected in series, and in this embodiment, 3 LEDs are used to form the LED lamp in series.
In this embodiment, the driving subunit is a resistive driving circuit, which is composed of resistors TR1-TR6, and the circuit current is regulated by the resistance values of the resistors TR1-TR 6.
In other embodiments, the driving subunit may be a triode constant current driving circuit. Depending on the actual situation.
In this embodiment, when the LED is operating normally, the voltage at the TEST node corresponds to the voltage clamped by the voltage regulator D3 and the PN junction of the transistor Q2, which is about 2.1V, and is low relative to the voltage at the negative electrode of the LED (about 6V), the voltage drop between the two points is insufficient to turn on the transistor Q3, so that the transistor Q2 is turned on, the transistor Q3 is turned off, the base voltage of the transistor Q1 is clamped at 1.2V, the emitter voltage of the transistor Q1 is 1.9V, the transistor Q1 is turned on, the base voltage of the transistor Q4 is divided by the voltage dividing resistors R1 and R6 and is stabilized at 0.8V, the transistor Q4 is turned on according to the turn-on principle of the NPN transistor, the voltage regulator D2 and the resistor R4 are shorted, and the body receives a low-level signal at this time, and the voltage is less than 1V. When an LED, such as TL1, fails, the cathode of the diode TD2 is grounded through a resistor, the base electrode of the triode Q2 is grounded, the triode Q2 is in a cut-off state, no voltage difference exists between the emitter electrode and the base electrode of the triode Q1 and cannot be conducted, the triode Q4 is in a cut-off state, the voltage stabilizing tube D2 is conducted according to the reverse conduction characteristic of the voltage stabilizing tube, and a high-level signal is received by a vehicle body.
After the LED breaks circuit and loses efficacy, the automobile body can detect the fault feedback demand, and the demand of functional safety can be met. The common singlechip detection is canceled, the loop node voltage when the LED is disconnected is utilized, the development characteristic of the triode is combined, the application that the circuit can realize fault feedback after the LED fails is completed, compared with the singlechip and surrounding circuits for realizing the function, the circuit has the advantages of simple structure, low cost of components and parts, strong interchangeability, simple EMC (electromagnetic compatibility ) experiment correction and the like, and can be suitable for all functions of an automobile, and the circuit has simple functions and more LEDs.
In the present embodiment, the above-described specifying apparatus refers to a vehicle body terminal or the like.
In this embodiment, after the open-circuit fault state is detected, the open-circuit protection operation is performed, the fault signal is fed back to the whole vehicle, and the open-circuit feedback operation is performed.
According to the lamp fault feedback circuit, the power supply unit 10, the LED unit 20, the signal detection unit 30 and the fault feedback unit 40 are arranged, the state of the LED unit 20 is monitored by the signal detection unit 30, when the LED unit 20 breaks down, the fault feedback unit 40 is used for feeding back to appointed equipment, and the fault detection and feedback are carried out by adopting the combination of the triode, the diode and the voltage regulator tube, so that the lamp fault feedback circuit is simple in structure, low in cost, capable of detecting faults and meeting the requirements of functional safety.
While the utility model has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.
Claims (10)
1. A luminaire failure feedback circuit, comprising: the LED display device comprises a power supply unit, an LED unit, a signal detection unit and a fault feedback unit;
the power supply unit is used for providing working voltage, filtering and reverse connection prevention protection for the LED unit;
the LED unit is used for being turned on or turned off according to the working voltage;
the signal detection unit is used for detecting whether the LED unit works normally or not;
and the fault feedback unit is used for feeding back a fault signal to the appointed equipment when the LED unit does not work normally.
2. A luminaire fault feedback circuit as claimed in claim 1, characterized in that the signal detection unit comprises a diode TD2 and a diode TD3.
3. A lamp fault feedback circuit according to claim 1, wherein the fault feedback unit comprises a switching assembly and a regulator tube D2; the switch component is respectively connected with the voltage stabilizing tube D2 and the signal detection unit.
4. A lamp fault feedback circuit according to claim 3, wherein the switch assembly comprises a transistor Q1, a transistor Q2, a transistor Q3 and a transistor Q4, and the signal detection unit is connected to the base of the transistor Q3; the emitter of the triode Q2 is connected with the base electrode of the triode Q2; the collector of the triode Q2 is connected with the base of the triode Q1, the collector of the triode Q1 is connected with the base of the triode Q4, and the collector of the triode Q4 is connected with the voltage stabilizing tube D2.
5. The lamp fault feedback circuit according to claim 4, wherein a resistor R4 is connected to a negative electrode of the voltage regulator D2, the resistor R4 is grounded through a resistor R5, and the resistor R5 is connected to an emitter of the triode Q4.
6. A lamp fault feedback circuit according to claim 5, wherein the positive pole of the regulator D2 is connected to the diode D1.
7. A lamp fault feedback circuit according to claim 6, wherein the emitter of transistor Q2 is grounded through a regulator D3.
8. The lamp fault feedback circuit according to claim 7, wherein a base of the triode Q4 is connected to a voltage dividing resistor R1 and a voltage dividing resistor R6.
9. A lamp fault feedback circuit according to claim 1, wherein the power supply unit comprises a diode TT1, a filter capacitor TC2 and an anti-reflection diode TD1; the diode TT1 is connected with a power supply, the other end of the diode TT1 is grounded, and the diode TT1 is connected with the filter capacitor TC2 in parallel; the power supply is connected with the LED unit through an anti-reflection diode TD 1.
10. A luminaire fault feedback circuit as claimed in claim 9, characterized in that the LED unit comprises a drive subunit and an LED lamp, the LED lamp being connected to the anti-reflection diode TD1, the drive subunit being connected to the LED lamp, the signal detection unit being connected to the LED lamp.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321728475.3U CN220440959U (en) | 2023-07-04 | 2023-07-04 | Lamp fault feedback circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321728475.3U CN220440959U (en) | 2023-07-04 | 2023-07-04 | Lamp fault feedback circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220440959U true CN220440959U (en) | 2024-02-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321728475.3U Active CN220440959U (en) | 2023-07-04 | 2023-07-04 | Lamp fault feedback circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220440959U (en) |
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2023
- 2023-07-04 CN CN202321728475.3U patent/CN220440959U/en active Active
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