CN220673381U - NTC control circuit of projector - Google Patents
NTC control circuit of projector Download PDFInfo
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- CN220673381U CN220673381U CN202322291684.2U CN202322291684U CN220673381U CN 220673381 U CN220673381 U CN 220673381U CN 202322291684 U CN202322291684 U CN 202322291684U CN 220673381 U CN220673381 U CN 220673381U
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- resistor
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- comparator
- circuit
- capacitor
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- 239000003990 capacitor Substances 0.000 claims description 39
- 230000009977 dual effect Effects 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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Abstract
The utility model discloses a projector NTC control circuit, which comprises a comparator running circuit, wherein the comparator running circuit comprises a comparator U1, a 7 pin 2OUT of the comparator U1 is respectively connected with a resistor R1 and a base electrode of a triode Q1, the other end of the resistor R1 is connected with a 3.3V_STB circuit, an emitter electrode of the triode Q1 is grounded, and a collector electrode of the triode Q1 is respectively connected with a resistor R2 and an NTC_DET pin on a lamp panel; the 6 pin 2IN of the comparator U1 is connected with a resistor R6, and the other end of the resistor R6 is respectively connected with signal pins of the joints of the resistors R5 and CN 1; the projector is internally provided with the NTC protection control circuit, and the power supply can be turned off by controlling the NTC protection control circuit when the lamp panel is at abnormal high temperature, so that the projector is protected.
Description
Technical Field
The utility model relates to a projector, in particular to a projector NTC control circuit.
Background
As shown in fig. 1, fig. 1 is a power panel protection circuit diagram of a projector in the prior art, the power panel protection circuit is to connect a temperature control protection switch between a power panel and an LED lamp panel, the temperature control protection switch 1 is fixed on the back of the lamp panel, when the temperature exceeds a set value, the temperature control protection switch is turned off, the LED lamp is extinguished, and the temperature control protection switch needs to be increased on a light source connecting line, and the fixed position of the temperature control protection switch needs to be considered, so that the cost is high and the assembly is difficult.
Disclosure of Invention
Aiming at the defects in the prior art, the technical problem to be solved by the utility model is to provide the projector NTC control circuit, and the purpose of designing the NTC control circuit is to turn off the power supply of the LED lamp through the NTC control circuit to protect the projector when the lamp panel is at an abnormally high temperature, so that the projector is prevented from being high Wen Shousun.
In order to solve the technical problems, the utility model is realized by the following scheme: an NTC control circuit of a projector of the present utility model, the control circuit includes:
two connectors, wherein a CN1 connector is electrically connected with the NTC module, and a CN2 connector is electrically connected with a power panel;
a comparator operation circuit including a comparator U1, the 4-pin GND of the comparator U1 being grounded; the 8-pin VCC is respectively and electrically connected with the 12V_STB circuit, the capacitor C1 and the capacitor C2; the capacitor C1 and the capacitor C2 are connected in parallel and then grounded, the pin 7 OUT of the comparator U1 is respectively connected with a resistor R1 and the base electrode of a triode Q1, the other end of the resistor R1 is connected with a 3.3V_STB circuit, the emitter electrode of the triode Q1 is grounded, and the collector electrode of the triode Q1 is respectively connected with the resistor R2 and the NTC_DET pin on the lamp panel; the 6-pin 2IN of the comparator U1 is connected with a resistor R6, the other end of the resistor R6 is respectively connected with signal pins of the joints of the resistors R5 and CN1, the 5-pin 2IN of the comparator U1 is connected with the first end of a resistor R7, and the second end of the resistor R7 is connected with a VREF circuit;
the NTC protection post-stage circuit is electrically connected with the CN2 joint and comprises an inductor FB1, a capacitor C4 and a capacitor C5 which are connected into the 12V_STB circuit, wherein the capacitor C4 and the capacitor C5 are connected in parallel and then grounded, the other end of the inductor FB1 is connected with the pins 5 of the capacitor C3 and the CN2 joint, and the other end of the capacitor C3 is grounded; the NTC protection post-stage circuit further comprises a resistor R8, a resistor R9, a resistor R10 and a capacitor C6, wherein one end of the resistor R8 is connected to the BRI-ADJ circuit, the other end of the resistor R8 is respectively connected with the resistor R9 and the resistor R10, the other end of the resistor R10 is grounded, the other end of the resistor R9 is connected with the capacitor C6 and the pin 1 of the CN2 connector, and the other end of the capacitor C6 is grounded; the circuit node between the resistor R9 and the resistor R8 is electrically connected to the ntc_det pin.
Further, the comparator U1 is a low-power-consumption dual-voltage comparator.
Further, the 5 th pin 2in+ of the comparator U1 is a reference voltage output pin.
Further, a resistor R3 and a resistor R4 are connected in the VREF circuit, a second end of the resistor R7 is connected with the resistor R3 and the resistor R4 respectively, the other end of the resistor R3 is connected to the 12v_stb circuit, and the other end of the resistor R4 is grounded.
Further, the 4 feet of the CN2 connector and the 5 feet of the CN2 connector are connected with each other, the 2 feet of the CN2 connector and the 3 feet of the CN2 connector are connected with each other and then grounded, the 6 feet of the CN2 connector are grounded, and the 7 feet of the CN2 connector are grounded.
Further, the CN1 connector has four pins, three of which are grounded.
Compared with the prior art, the utility model has the beneficial effects that:
1. the projector is internally provided with the NTC protection control circuit, and the power supply can be turned off by controlling the NTC protection control circuit when the lamp panel is at abnormal high temperature, so that the projector is protected.
2. According to the utility model, a temperature control protection switch is removed, a comparator is arranged on a circuit board, one pin of the comparator is set as a reference voltage output pin, and the voltage of the 6 pin of the comparator and the voltage of the 5 pin of the comparator are judged, so that whether the comparator 7 outputs a low level or a high level or not is judged, and the on-off of a power supply is controlled, so that a projector is protected, and the projector is prevented from being high Wen Shousun.
Drawings
Fig. 1 is a schematic block diagram of a power panel protection circuit in a projector according to the prior art.
Fig. 2 is a schematic block diagram of an NTC protection control circuit according to the present utility model.
Fig. 3 is a circuit diagram of the operation of the comparator of the present utility model.
Fig. 4 is a circuit diagram of the NTC protection post-stage of the present utility model.
The reference numerals in the drawings: a temperature control protection switch 1.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described in the following with reference to the drawings in the embodiments of the present utility model, so that the advantages and features of the present utility model can be more easily understood by those skilled in the art, and thus the protection scope of the present utility model is more clearly and clearly defined. In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
Example 1: the specific structure of the utility model is as follows:
referring to fig. 2 to 4, an NTC control circuit for a projector according to the present utility model includes:
two connectors, wherein a CN1 connector is electrically connected with the NTC module, and a CN2 connector is electrically connected with a power panel;
a comparator operation circuit including a comparator U1, the 4-pin GND of the comparator U1 being grounded; the 8-pin VCC is respectively and electrically connected with the 12V_STB circuit, the capacitor C1 and the capacitor C2; the capacitor C1 and the capacitor C2 are connected in parallel and then grounded, the pin 7 OUT of the comparator U1 is respectively connected with a resistor R1 and the base electrode of a triode Q1, the other end of the resistor R1 is connected with a 3.3V_STB circuit, the emitter electrode of the triode Q1 is grounded, and the collector electrode of the triode Q1 is respectively connected with the resistor R2 and the NTC_DET pin on the lamp panel; the 6-pin 2IN of the comparator U1 is connected with a resistor R6, the other end of the resistor R6 is respectively connected with signal pins of the joints of the resistors R5 and CN1, the 5-pin 2IN of the comparator U1 is connected with the first end of a resistor R7, and the second end of the resistor R7 is connected with a VREF circuit;
the NTC protection post-stage circuit is electrically connected with the CN2 joint and comprises an inductor FB1, a capacitor C4 and a capacitor C5 which are connected into the 12V_STB circuit, wherein the capacitor C4 and the capacitor C5 are connected in parallel and then grounded, the other end of the inductor FB1 is connected with the pins 5 of the capacitor C3 and the CN2 joint, and the other end of the capacitor C3 is grounded; the NTC protection post-stage circuit further comprises a resistor R8, a resistor R9, a resistor R10 and a capacitor C6, wherein one end of the resistor R8 is connected to the BRI-ADJ circuit, the other end of the resistor R8 is respectively connected with the resistor R9 and the resistor R10, the other end of the resistor R10 is grounded, the other end of the resistor R9 is connected with the capacitor C6 and the pin 1 of the CN2 connector, and the other end of the capacitor C6 is grounded; the circuit node between the resistor R9 and the resistor R8 is electrically connected to the ntc_det pin.
A preferred technical scheme of the embodiment is as follows: the comparator U1 is a low-power-consumption dual-voltage comparator, and the model LM2903 comparator is selected in the embodiment.
A preferred technical scheme of the embodiment is as follows: the 5 th pin 2in+ of the comparator U1 is a reference voltage output pin.
A preferred technical scheme of the embodiment is as follows: the VREF circuit is connected with a resistor R3 and a resistor R4, the second end of the resistor R7 is respectively connected with the resistor R3 and the resistor R4, the other end of the resistor R3 is connected to the 12V_STB circuit, and the other end of the resistor R4 is grounded.
A preferred technical scheme of the embodiment is as follows: the 4 feet of the CN2 joint and the 5 feet of the CN2 joint are connected with each other, the 2 feet of the CN2 joint and the 3 feet of the CN2 joint are connected with each other and then grounded, the 6 feet of the CN2 joint are grounded, and the 7 feet of the CN2 joint are grounded.
A preferred technical scheme of the embodiment is as follows: the CN1 joint is provided with four pins, and three pins of the four pins are grounded.
Example 2:
the following is the control principle of the control circuit of the utility model:
as shown in fig. 2-4, the CN1 connector is connected with the NTC on the lamp panel, the NTC is used for collecting the temperature on the circuit board, and the CN2 connector is connected with the power panel; the 5 th pin 2in+ of the comparator U1 is set to a reference voltage value, and three control modes are set:
when the lamp panel is lighted, the NTC resistance on the lamp panel changes, and the 6 th pin 2 IN-voltage of the comparator U1 is further caused to change.
When the temperature of the lamp panel is lower, the 6 th pin 2 IN-voltage of the comparator U1 is lower than the 5 th pin 2IN+ voltage of the comparator U1, the 7 th pin OUT of the comparator U1 outputs a low level, the NTC_DET circuit connected to the NTC is high, and the BRI_ADJ circuit signal output to the power panel is not affected.
When the temperature of the lamp panel is higher, the 6 th pin 2 IN-voltage of the comparator U1 is higher than the 5 th pin 2IN+ voltage of the comparator U1, the 7 th pin OUT of the comparator U1 outputs a high level, the NTC_DET circuit connected to the NTC is low, the BRI_ADJ circuit signal on the power panel is pulled down, and the processor turns off the LED lamp light source to avoid damage caused by overhigh temperature of the projector.
In summary, the projector of the present utility model is provided with the NTC protection control circuit, and the LED lamp power can be turned off by the NTC protection control circuit when the lamp panel is at an abnormally high temperature, so that the projector can be protected. According to the utility model, a temperature control protection switch is removed, a comparator is arranged on a circuit board, one pin of the comparator is set as a reference voltage output pin, and the voltage of the 6 pin of the comparator and the voltage of the 5 pin of the comparator are judged, so that whether the comparator 7 outputs a low level or a high level or not is judged, and the on-off of a power supply is controlled, so that a projector is protected, and the projector is prevented from being high Wen Shousun.
The foregoing description is only of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes using the descriptions and the drawings of the present utility model or directly or indirectly applied to other related technical fields are included in the scope of the utility model.
Claims (6)
1. A projector NTC control circuit characterized in that the control circuit comprises:
two connectors, wherein a CN1 connector is electrically connected with the NTC module, and a CN2 connector is electrically connected with a power panel;
a comparator operation circuit including a comparator U1, the 4-pin GND of the comparator U1 being grounded; the 8-pin VCC is respectively and electrically connected with the 12V_STB circuit, the capacitor C1 and the capacitor C2; the capacitor C1 and the capacitor C2 are connected in parallel and then grounded, the pin 7 OUT of the comparator U1 is respectively connected with a resistor R1 and the base electrode of a triode Q1, the other end of the resistor R1 is connected with a 3.3V_STB circuit, the emitter electrode of the triode Q1 is grounded, and the collector electrode of the triode Q1 is respectively connected with the resistor R2 and the NTC_DET pin on the lamp panel; the 6-pin 2IN of the comparator U1 is connected with a resistor R6, the other end of the resistor R6 is respectively connected with signal pins of the joints of the resistors R5 and CN1, the 5-pin 2IN of the comparator U1 is connected with the first end of a resistor R7, and the second end of the resistor R7 is connected with a VREF circuit;
the NTC protection post-stage circuit is electrically connected with the CN2 joint and comprises an inductor FB1, a capacitor C4 and a capacitor C5 which are connected into the 12V_STB circuit, wherein the capacitor C4 and the capacitor C5 are connected in parallel and then grounded, the other end of the inductor FB1 is connected with the pins 5 of the capacitor C3 and the CN2 joint, and the other end of the capacitor C3 is grounded; the NTC protection post-stage circuit further comprises a resistor R8, a resistor R9, a resistor R10 and a capacitor C6, wherein one end of the resistor R8 is connected to the BRI-ADJ circuit, the other end of the resistor R8 is respectively connected with the resistor R9 and the resistor R10, the other end of the resistor R10 is grounded, the other end of the resistor R9 is connected with the capacitor C6 and the pin 1 of the CN2 connector, and the other end of the capacitor C6 is grounded; the circuit node between the resistor R9 and the resistor R8 is electrically connected to the ntc_det pin.
2. The NTC projector control circuit of claim 1 wherein the comparator U1 is a low power dual voltage comparator.
3. The NTC control circuit of claim 1 characterized IN that pin 5, 2IN + of the comparator U1 is the reference voltage output pin.
4. The NTC control circuit of claim 1 characterized in that the VREF circuit is connected with a resistor R3 and a resistor R4, the second end of the resistor R7 is connected with a resistor R3 and a resistor R4, respectively, the other end of the resistor R3 is connected to the 12v_stb circuit, and the other end of the resistor R4 is grounded.
5. The NTC control circuit of claim 1 characterized in that the 4 pins of the CN2 joint and the 5 pins of the CN2 joint are connected to each other, the 2 pins of the CN2 joint and the 3 pins of the CN2 joint are connected to each other and then grounded, the 6 pins of the CN2 joint are grounded, and the 7 pins of the CN2 joint are grounded.
6. The NTC projector control circuit of claim 1 wherein the CN1 joint has four pins, three of which are grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322291684.2U CN220673381U (en) | 2023-08-25 | 2023-08-25 | NTC control circuit of projector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322291684.2U CN220673381U (en) | 2023-08-25 | 2023-08-25 | NTC control circuit of projector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220673381U true CN220673381U (en) | 2024-03-26 |
Family
ID=90336266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322291684.2U Active CN220673381U (en) | 2023-08-25 | 2023-08-25 | NTC control circuit of projector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220673381U (en) |
-
2023
- 2023-08-25 CN CN202322291684.2U patent/CN220673381U/en active Active
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