CN210894470U - Backlight detection circuit and device - Google Patents
Backlight detection circuit and device Download PDFInfo
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- CN210894470U CN210894470U CN201921219871.7U CN201921219871U CN210894470U CN 210894470 U CN210894470 U CN 210894470U CN 201921219871 U CN201921219871 U CN 201921219871U CN 210894470 U CN210894470 U CN 210894470U
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Abstract
A load module, a current collection module, a voltage collection module and a control module are added to automatically collect backlight voltage and backlight current of a backlight source, compare the collected backlight voltage and backlight current with preset values and output comparison results, so that whether the backlight current and the backlight voltage of the backlight source meet requirements can be automatically judged in real time, and the problems of missing detection and error detection caused by judging whether the backlight current meets the requirements by manually reading the current value of an electronic load instrument in the traditional technical scheme are solved.
Description
Technical Field
The utility model belongs to the technical field of the current detection in a poor light, especially, relate to a detection circuitry and device are shaded.
Background
At present, the backlight current test of the backlight source of the traditional three-in-one television board card generally directly utilizes an electronic load instrument to be directly connected with the television board card, and then judges whether the backlight current meets the requirement or not by manually reading the current value on the electronic load instrument, but the problems of missing test and mistest easily occur in the traditional mode.
Therefore, the conventional technical scheme has the problems of leakage detection and error detection of the backlight current.
SUMMERY OF THE UTILITY MODEL
In view of this, the embodiment of the present invention provides a backlight detection circuit and device, which aim to solve the problems of leakage and misdetection of backlight current and voltage existing in the conventional technical solution.
The utility model discloses a first aspect of the embodiment provides a detection circuitry is shaded, is connected with the backlight of TV set integrated circuit board, detection circuitry is shaded includes: the load module is connected with the positive output end of the backlight source and is used for providing a target load; the current acquisition module is used for acquiring a current signal output by the backlight current flowing through the target load and acquiring backlight detection current according to the current signal; the input end of the voltage acquisition module is connected with the positive output end of the backlight source, and the voltage acquisition module is used for acquiring the backlight voltage of the backlight source; and the control module is connected with the current acquisition module and the voltage acquisition module and is used for comparing the backlight detection current with a preset current value and generating a current comparison result, and comparing the backlight voltage with a preset voltage value and generating a voltage comparison result.
In one embodiment, the current collection module comprises: the input end of the current input unit is connected with the load module, and the current input unit is used for accessing the current signal; the input end of the current amplification unit is connected with the output end of the current input unit, and the current amplification unit is used for amplifying the current signal into the backlight detection current; the current negative feedback unit is connected with the current amplification unit and is used for enabling the amplification value of the current amplification unit to be a target amplification value; and the input end of the output current filtering unit is connected with the output end of the current amplifying unit, the output end of the output current filtering unit is grounded, and the output current filtering unit is used for filtering clutter interference of backlight detection current output by the current amplifying unit.
In one embodiment, the current input unit includes: the backlight detection circuit comprises a first resistor, a second resistor, a first capacitor and a second capacitor, wherein the first end of the first resistor, the first end of the second resistor, the first end of the first capacitor and the first end of the second capacitor are connected into the backlight detection current, the second end of the second resistor is grounded, the second end of the first capacitor and the second end of the second capacitor are connected to the ground in a shared mode, and the second end of the first resistor serves as the output end of the current input unit.
In one embodiment, the current amplifying unit includes an amplifier, a third capacitor and a fourth capacitor, a non-inverting input terminal of the amplifier is connected to the output terminal of the current input unit, a power source terminal of the amplifier, a first terminal of the third capacitor and a first terminal of the fourth capacitor are externally connected to a power source, and an output terminal of the amplifier is the output terminal of the current amplifying unit.
In one embodiment, the current degeneration unit includes: the first end of the third resistor and the first end of the fifth capacitor are connected to the output end of the current amplification unit in a sharing mode, the second end of the third resistor, the second end of the fifth capacitor and the first end of the fourth resistor are connected to the negative feedback end of the current amplification unit in a sharing mode, and the second end of the fourth resistor is grounded.
In one embodiment, the output current filtering unit includes: the negative electrode of the first voltage-regulator tube and the first end of the sixth capacitor are connected in common to serve as the input end of the output current filtering unit, and the positive electrode of the first voltage-regulator tube and the second end of the sixth capacitor are connected in common to serve as the output end of the output current filtering unit.
In one embodiment, the voltage acquisition unit includes: the input end of the voltage input unit is connected with the positive output end of the backlight source, and the voltage input unit is used for accessing the backlight voltage; the input end of the voltage amplifying unit is connected with the output end of the voltage input unit, and the voltage amplifying unit is used for amplifying the backlight voltage; the voltage negative feedback unit is connected with the voltage amplification unit and is used for enabling the amplification value of the backlight voltage to be a target amplification value; and the input end of the output voltage filtering unit is connected with the output end of the voltage amplifying unit, the output end of the output voltage filtering unit is grounded, and the output voltage filtering unit is used for filtering clutter interference of the backlight detection voltage output by the voltage amplifying unit.
A second aspect of the embodiments of the present invention provides a backlight detection apparatus, including: the power supply module is used for providing a target working power supply; and a backlight detection circuit as described above.
In one embodiment, the backlight detecting apparatus further comprises: and the isolation communication module is connected with the control module and the main control board of the television board card, and is used for transmitting the current comparison result and the voltage comparison result to the main control board.
In one embodiment, the power module includes: the main input end of the isolated power supply conversion unit is externally connected with a direct-current power supply; and the power supply conversion control unit is connected with the secondary input end of the isolation power supply conversion unit and is used for controlling the isolation power supply conversion unit to convert the direct-current power supply into a target working power supply.
According to the backlight detection circuit and the backlight detection device, the load module, the current collection module, the voltage collection module and the control module are added to automatically collect the backlight voltage and the backlight current of the backlight source, compare the backlight voltage and the backlight current with the preset value and output the comparison result, so that whether the backlight current and the backlight voltage of the backlight source meet the requirements can be automatically judged in real time, and the problems of missing detection and error detection caused by judging whether the backlight current meets the requirements by manually reading the current value of the electronic load instrument in the traditional technical scheme are solved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the embodiments or the prior art descriptions will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive labor.
Fig. 1 is a schematic circuit diagram of a backlight detection circuit according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an exemplary circuit of a current collection module in the backlight detection circuit shown in FIG. 1;
FIG. 3 is an exemplary detailed circuit schematic of the various elements of the current acquisition module shown in FIG. 1;
fig. 4 is a schematic circuit diagram of a power module of a backlight detection apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a circuit diagram of a backlight detection circuit according to a first embodiment of the present invention is shown, for convenience of illustration, only the relevant portions of the embodiment are shown, and the following details are described:
the backlight detection circuit in this embodiment is connected to the backlight source 100 of the tv board card, and the backlight detection circuit includes: the backlight module comprises a load module 200, a current collection module 300, a voltage collection module 400 and a control module 500, wherein the load module 200 is connected with the positive output end of the backlight source 100, the input end of the current collection module 300 is connected with the load module 200, the input end of the voltage collection module 400 is connected with the positive output end of the backlight source 100, and the control module 500 is connected with the current collection module 300 and the voltage collection module 400; the load module 200 is used to provide a target load; the current collecting module 300 is configured to collect a current signal output by the backlight current flowing through the target load, and obtain the backlight detection current according to the current signal; the voltage collecting module 400 is used for collecting the backlight voltage of the backlight source 100; the control module 500 is configured to compare the backlight detection current with a preset current value and generate a current comparison result, and compare the backlight voltage with a preset voltage value and generate a voltage comparison result.
It should be understood that the load module 200 is used for simulating the loading condition of the backlight 100, the load module 200 may include a serial LED lamp array composed of a plurality of serial LED lamps and a plurality of switch modules composed of switch tubes, the load module 200 provides a target load according to a required detection requirement, for example, the specification of each LED lamp is 30V, when the target load is 60V, the two LED lamps are turned on by controlling the on and off of the switch tubes, so that the load module 200 can provide a load of 60V; the current collection module 300 and the voltage collection module 400 may include resistors, capacitors, amplifiers, and the like; the control module 500 may be formed by a microprocessor, such as a single chip microcomputer of the STM32 family.
In the backlight detection circuit in this embodiment, the load module 200, the current collection module 300, the voltage collection module 400, and the control module 500 are added to automatically collect the backlight voltage and the backlight current of the backlight source 100, compare the collected backlight voltage and the backlight current with a preset value, and output a comparison result, so that whether the backlight current and the backlight voltage of the backlight source 100 meet the requirements can be automatically judged in real time, and the problems of missing detection and misdetection caused by manually reading the current value of the electronic load instrument to judge whether the backlight current meets the requirements in the conventional technical scheme are avoided.
Referring to fig. 2, in one embodiment, the current collecting module 300 includes: the current collection module 300 includes: the current amplifying circuit comprises a current input unit 310, a current amplifying unit 320, a current negative feedback unit 330 and an output current filtering unit 340, wherein the input end of the current input unit 310 is connected with the load module 200, the input end of the current amplifying unit 320 is connected with the output end of the current input unit 310, the current negative feedback unit 330 is connected with the current amplifying unit 320, the input end of the output current filtering unit 340 is connected with the output end of the current amplifying unit 320, and the output end of the output current filtering unit 340 is grounded; the current input unit 310 is used for accessing a current signal; the current amplifying unit 320 is used for amplifying the current signal into a backlight detection current; current negative feedback section 330 is for making the amplification value of current amplification section 320 a target amplification value; the output current filtering unit 340 is configured to filter noise interference of the backlight detection current output by the current amplifying unit 320.
It should be understood that the current input unit 310 may be composed of a resistor and a filter capacitor; the current amplifying unit 320 may be formed of a device or a chip having a signal amplifying function, such as a positive phase amplifier U1, an inverse phase amplifier U1, or the like; the current degeneration unit 330 may be formed of a feedback device, such as a feedback resistor; the output current filtering unit 340 may be formed of a device having a filtering function, such as a filter capacitor, a zener diode, and the like.
The current collection module 300 in this embodiment is stably connected to the backlight detection current by adding the current input unit 310; the current amplification unit 320 is added to amplify the backlight detection current, so that the problems that a proper threshold value is difficult to select for comparison and the error of the comparison result is large due to the fact that the backlight detection current is too small are solved; by adding the current negative feedback unit 330, the normal operation of the current amplification unit 320 is ensured, and the amplification error of the current amplification unit 320 is avoided; by adding the output current filtering unit 340, the noise interference is maximally filtered, and the interference of the noise to the backlight detection current output to the control module 500 is avoided.
Referring to fig. 3, in one embodiment, the current input unit 310 includes: the backlight detection circuit comprises a first resistor R1, a second resistor R2, a first capacitor C1 and a second capacitor C2, wherein a first end of the first resistor R1, a first end of the second resistor R2, a first end of the first capacitor C1 and a first end of the second capacitor C2 are connected to the backlight detection current, a second end of the second resistor R2 is grounded, a second end of the first capacitor C1 and a second end of the second capacitor C2 are connected to the ground in a shared mode, and a second end of the first resistor R1 serves as an output end of the current input unit 310.
Referring to fig. 3, in an embodiment, the current amplifying unit 320 includes an amplifier U1, a third capacitor C3, and a fourth capacitor C4, the non-inverting input terminal of the amplifier U1 is connected to the output terminal of the current input unit 310, the power supply 10 terminal of the amplifier U1, the first terminal of the third capacitor C3, and the first terminal of the fourth capacitor C4 are externally connected to the power supply 10, and the output terminal of the amplifier U1 is the output terminal of the current amplifying unit 320.
Referring to fig. 3, in one embodiment, the current degeneration unit 330 includes: a third resistor R3, a fourth resistor R4 and a fifth capacitor C5, wherein a first end of the third resistor R3 and a first end of the fifth capacitor C5 are commonly connected to the output terminal of the current amplifying unit 320, a second end of the third resistor R3, a second end of the fifth capacitor C5 and a first end of the fourth resistor R4 are commonly connected to the negative feedback terminal of the current amplifying unit 320, and a second end of the fourth resistor R4 is grounded.
Referring to fig. 3, in one embodiment, the output current filtering unit 340 includes: a negative electrode of the first voltage-regulator tube and a first end of the sixth capacitor C6 are connected in common as an input end of the output current filtering unit 340, and a positive electrode of the first voltage-regulator tube and a second end of the sixth capacitor C6 are connected in common as an output end of the output current filtering unit 340.
In one embodiment, the voltage acquisition unit includes: the voltage amplifying circuit comprises a voltage input unit, a voltage amplifying unit, a voltage negative feedback unit and an output voltage filtering unit; the input end of the voltage input unit is connected with the positive output end of the backlight source 100, the input end of the voltage amplification unit is connected with the output end of the voltage input unit, the voltage negative feedback unit is connected with the voltage amplification unit, the input end of the output voltage filtering unit is connected with the output end of the voltage amplification unit, and the output end of the output voltage filtering unit is grounded; the voltage input unit is used for accessing backlight voltage; the voltage amplifying unit is used for amplifying the backlight voltage; the voltage negative feedback unit is used for enabling the amplification value of the backlight voltage to be a target amplification value; the output voltage filtering unit is used for filtering out clutter interference of the backlight detection voltage output by the voltage amplifying unit.
It should be understood that the voltage input unit may be composed of a resistor and a filter capacitor; the voltage amplifying unit may be formed of a device or a chip having a signal amplifying function, such as a positive phase amplifier U1, an inverse phase amplifier U1, or the like; the voltage negative feedback unit may be formed of a feedback device, such as a feedback resistor; the output voltage filtering unit may be formed by a device having a filtering function, such as a filter capacitor, a zener diode, and the like.
A second aspect of the embodiments of the present invention provides a backlight detection apparatus, including: the power supply module is used for providing a target working power supply; and a backlight detection circuit as in the first aspect of the embodiments of the present invention.
Optionally, the power source connected to the power module in this embodiment and the power source 10 appearing in the first aspect of the embodiment of the present invention may be the same power source; optionally, the power supply 10 appearing in the first aspect of the embodiment of the present invention may also be a power supply output by the power supply module in this embodiment.
In one embodiment, further comprising: and the isolation communication module is connected with the control module 500 and the main control board of the television board card, and is used for transmitting the current comparison result and the voltage comparison result to the main control board.
Referring to fig. 4, in an embodiment, the power module includes an isolated power conversion unit 920 and a power conversion control unit 910, wherein a main input end of the isolated power conversion unit 920 is externally connected to a dc power supply; the power conversion control unit 910 is connected to a secondary input end of the isolated power conversion unit 920, and the power conversion control unit 910 is configured to control the isolated power conversion unit 920 to convert the dc power into the target working power.
The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A backlight detection circuit is characterized in that the backlight detection circuit is connected with a backlight source of a television board card, and the backlight detection circuit comprises:
the load module is connected with the positive output end of the backlight source and is used for providing a target load;
the current acquisition module is used for acquiring a current signal output by the backlight current flowing through the target load and acquiring backlight detection current according to the current signal;
the input end of the voltage acquisition module is connected with the positive output end of the backlight source, and the voltage acquisition module is used for acquiring the backlight voltage of the backlight source; and
the control module is connected with the current acquisition module and the voltage acquisition module and used for comparing the backlight detection current with a preset current value and generating a current comparison result, and comparing the backlight voltage with a preset voltage value and generating a voltage comparison result.
2. The backlight detection circuit of claim 1, wherein the current collection module comprises:
the input end of the current input unit is connected with the load module, and the current input unit is used for accessing the current signal;
the input end of the current amplification unit is connected with the output end of the current input unit, and the current amplification unit is used for amplifying the current signal into the backlight detection current;
the current negative feedback unit is connected with the current amplification unit and is used for enabling the amplification value of the current amplification unit to be a target amplification value; and
the output current filtering unit, the input of output current filtering unit with the output of current amplification unit is connected, the output ground connection of output current filtering unit, the output current filtering unit is used for the filtering the clutter interference of the detection current in a poor light of current amplification unit output.
3. The backlight detection circuit according to claim 2, wherein the current input unit comprises: the backlight detection circuit comprises a first resistor, a second resistor, a first capacitor and a second capacitor, wherein the first end of the first resistor, the first end of the second resistor, the first end of the first capacitor and the first end of the second capacitor are connected into the backlight detection current, the second end of the second resistor is grounded, the second end of the first capacitor and the second end of the second capacitor are connected to the ground in a shared mode, and the second end of the first resistor serves as the output end of the current input unit.
4. The backlight detecting circuit of claim 2, wherein the current amplifying unit comprises an amplifier, a third capacitor and a fourth capacitor, a non-inverting input terminal of the amplifier is connected to the output terminal of the current input unit, a power source terminal of the amplifier, a first terminal of the third capacitor and a first terminal of the fourth capacitor are externally connected to a power source, and an output terminal of the amplifier is an output terminal of the current amplifying unit.
5. The backlight detection circuit of claim 2, wherein the current negative feedback unit comprises: the first end of the third resistor and the first end of the fifth capacitor are connected to the output end of the current amplification unit in a sharing mode, the second end of the third resistor, the second end of the fifth capacitor and the first end of the fourth resistor are connected to the negative feedback end of the current amplification unit in a sharing mode, and the second end of the fourth resistor is grounded.
6. The backlight detection circuit of claim 2, wherein the output current filtering unit comprises: the negative electrode of the first voltage-regulator tube and the first end of the sixth capacitor are connected in common to serve as the input end of the output current filtering unit, and the positive electrode of the first voltage-regulator tube and the second end of the sixth capacitor are connected in common to serve as the output end of the output current filtering unit.
7. The backlight detection circuit of claim 1, wherein the voltage acquisition unit comprises:
the input end of the voltage input unit is connected with the positive output end of the backlight source, and the voltage input unit is used for accessing the backlight voltage;
the input end of the voltage amplifying unit is connected with the output end of the voltage input unit, and the voltage amplifying unit is used for amplifying the backlight voltage;
the voltage negative feedback unit is connected with the voltage amplification unit and is used for enabling the amplification value of the backlight voltage to be a target amplification value; and
the output voltage filtering unit, the input of output voltage filtering unit with the output of voltage amplification unit is connected, the output ground connection of output voltage filtering unit, output voltage filtering unit is used for the filtering the clutter interference of the detection voltage in a poor light of voltage amplification unit output.
8. A backlight detection apparatus, comprising:
the power supply module is used for providing a target working power supply; and
the backlight detection circuit according to any of claims 1-7.
9. The backlight detecting device according to claim 8, further comprising:
and the isolation communication module is connected with the control module and the main control board of the television board card, and is used for transmitting the current comparison result and the voltage comparison result to the main control board.
10. The backlight detection apparatus of claim 8, wherein the power module comprises:
the main input end of the isolated power supply conversion unit is externally connected with a direct-current power supply; and
and the power supply conversion control unit is connected with the secondary input end of the isolation power supply conversion unit and is used for controlling the isolation power supply conversion unit to convert the direct-current power supply into a target working power supply.
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| CN201921219871.7U CN210894470U (en) | 2019-07-29 | 2019-07-29 | Backlight detection circuit and device |
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| CN201921219871.7U CN210894470U (en) | 2019-07-29 | 2019-07-29 | Backlight detection circuit and device |
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| CN210894470U true CN210894470U (en) | 2020-06-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865294A (en) * | 2020-07-30 | 2020-10-30 | 清华四川能源互联网研究院 | Power matching interface circuit and power matching system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111865294A (en) * | 2020-07-30 | 2020-10-30 | 清华四川能源互联网研究院 | Power matching interface circuit and power matching system |
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