CN116682338B - Voltage control circuit and universal screen test board - Google Patents
Voltage control circuit and universal screen test board Download PDFInfo
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- CN116682338B CN116682338B CN202310716706.7A CN202310716706A CN116682338B CN 116682338 B CN116682338 B CN 116682338B CN 202310716706 A CN202310716706 A CN 202310716706A CN 116682338 B CN116682338 B CN 116682338B
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
- G01R1/28—Provision in measuring instruments for reference values, e.g. standard voltage, standard waveform
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The application relates to a voltage control circuit and a universal screen test board, which belong to the technical field of electronic circuits, and comprise a voltage conversion module, a control module and a voltage regulation module, wherein the voltage conversion module receives a positive voltage of external voltage to convert the positive voltage into a negative voltage to obtain a test voltage; the output end of the voltage conversion module is connected with the load circuit so as to output the regulated test voltage to the load circuit; the problem that the negative pressure special chip is difficult to be suitable for testing partial screens, so that the universality is poor and the using effect is poor can be solved.
Description
Technical Field
The application relates to a voltage control circuit and a universal screen test board, and belongs to the technical field of electronic circuits.
Background
Screens, also known as displays, are appliances for displaying images and colors. In order to avoid abnormal phenomena such as dead spots, stroboscopic, black screen, white screen, dead halt, color distortion and the like of the screen, the screen usually has a certain performance index, so before the screen is used, whether the screen meets the performance index needs to be tested.
When testing the screen in the traditional technology, including two types of test circuits of positive power supply test and negative power supply test, because the voltage that uses when the negative voltage test is lower for the negative voltage test is safer, consequently use the negative power supply circuit to test the screen. In a typical negative voltage control circuit scheme, a negative power supply is connected to a negative power supply special chip and then connected to a screen circuit, and the negative power supply special chip receives the voltage input by the negative power supply and outputs the voltage suitable for a screen to the screen circuit after voltage adjustment so as to test the screen.
However, the voltage application ranges of different screens are different, the applicable voltage of most screens is contained in the voltage range of-1 to-10V, but the voltage range which can be output by the negative pressure special chip is-2 to-6V, so that the negative pressure special chip is difficult to be applied to the test of part of the screens, the universality is poor, and the application effect is poor.
Disclosure of Invention
The application provides a voltage control circuit and general screen test board, can solve the special chip of negative pressure and be difficult to be applicable to the test of partial screen, lead to the commonality relatively poor to lead to the relatively poor problem of result in the result of use. The application provides the following technical scheme:
in a first aspect, there is provided a voltage control circuit comprising: the device comprises a voltage conversion module, a control module and a voltage regulation module;
the voltage conversion module receives a positive voltage of an external voltage to convert the positive voltage into a negative voltage, so as to obtain the test voltage;
the first output end of the control module is connected with the input end of the voltage regulation module so as to output a voltage regulation signal to the voltage regulation module;
the output end of the voltage regulating module is connected with the feedback end of the voltage converting module so as to output a voltage feedback signal to the voltage converting module through the feedback end under the condition of receiving the voltage regulating signal;
the voltage conversion module is further used for adjusting the test voltage based on a voltage value indicated by the voltage feedback signal under the condition that the feedback end receives the voltage feedback signal, so as to obtain an adjusted test voltage; the output end of the voltage conversion module is connected with the load circuit so as to output the regulated test voltage to the load circuit under the condition that the regulated test voltage is obtained.
Optionally, the voltage control circuit further comprises: the voltage sampling module is connected with the output end of the voltage conversion module;
the output end of the voltage sampling module is connected with the control module so as to output the sampling signal to the control module under the condition that the sampling signal is obtained by sampling the test voltage through the output end of the voltage conversion module;
the control module is also used for detecting whether the sampling value indicated by the sampling signal is matched with a preset set value or not, and outputting the voltage regulating signal to the voltage regulating module under the condition that the sampling value is not matched with the set value.
Optionally, the voltage sampling module includes: an inverting proportional amplifier and an analog-to-digital converter connected with the inverting proportional amplifier;
the input end of the inverting proportional amplifier is connected with the output end of the voltage converter so as to collect the test voltage and convert the negative test voltage into a positive test voltage;
the analog-to-digital converter is used for converting the positive voltage test voltage from an analog signal to a digital signal to obtain a sampling signal; the output end of the analog-to-digital converter is connected with the input end of the control module so as to output the sampling signal to the control module.
Optionally, the voltage control circuit further comprises: an isolation module;
the first input end of the isolation module is connected with the second output end of the control module so as to receive a first enabling signal output by the control module; the output end of the isolation module is connected with the enabling end of the voltage conversion module, so that under the condition that the first enabling signal is received, a power-on signal is output to the voltage conversion module through the enabling end, and the voltage conversion module is started.
Optionally, the isolation module comprises a photo coupler.
Optionally, the voltage control circuit further comprises: a current protection module;
the input end of the current protection module is connected with the input end of the load circuit, and the current protection module is used for collecting the current value of the load circuit and outputting a circuit abnormality signal to the control module under the condition that the current value is larger than a preset maximum current value;
the control unit is further used for outputting a second enabling signal to the isolation module under the condition that the circuit abnormal signal is received;
the isolation module is further configured to output a down-going signal to the voltage conversion module through the enable terminal under the condition that the second enable signal is received, so that the voltage conversion module is turned off.
Optionally, the voltage regulating module comprises a digital-to-analog converter, an in-phase amplifier connected with the digital-to-analog converter, and a multi-node circuit connected with the in-phase amplifier;
the input end of the digital-to-analog converter is connected with the control module, and the output end of the digital-to-analog converter is connected with the input end of the in-phase amplifier so as to output a first voltage regulating signal to the in-phase amplifier under the condition that the voltage regulating signal is received;
the in-phase amplifier is used for outputting a second voltage regulating signal to the multi-node circuit under the condition that the first voltage regulating signal is received;
the multi-node circuit is respectively connected with the feedback end, the output end of the voltage conversion module and the grounding end of the voltage conversion module, so that the test voltage is adjusted based on kirchhoff current law, and a voltage feedback signal is output to the feedback end under the condition that the second voltage adjusting signal is received.
Optionally, the voltage control circuit further comprises: a first filter capacitor and a second filter capacitor;
the first filter capacitor is connected to the input end of the external power supply to filter positive voltage input by the external power supply;
the second filter capacitor access is connected with the output end of the voltage conversion module so as to filter the test voltage output by the voltage conversion module and the regulated test voltage.
Optionally, the voltage control circuit is integrated in the same chip.
In a second aspect, a universal screen test panel is provided, the universal screen test panel comprising at least one voltage control circuit, the voltage control circuit comprising a voltage control circuit according to any of claims 1-9.
The beneficial effects of this application include at least: the voltage control circuit comprises a voltage conversion module, a control module and a voltage regulation module, wherein the voltage conversion module receives positive voltage of external voltage to convert the positive voltage into negative voltage to obtain test voltage, a first output end of the control module is connected with an input end of the voltage regulation module to output a voltage regulation signal to the voltage regulation module, an output end of the voltage regulation module is connected with a feedback end of the voltage conversion module to output a voltage feedback signal to the voltage conversion module through the feedback end under the condition that the voltage regulation signal is received, and the voltage conversion module is further used for regulating the test voltage based on a voltage value indicated by the voltage feedback signal under the condition that the voltage feedback signal is received by the feedback end to obtain the regulated test voltage; the output end of the voltage conversion module is connected with the load circuit so as to output the regulated test voltage to the load circuit under the condition that the regulated test voltage is obtained; the problem that the negative pressure special chip is difficult to be suitable for testing part of the screen, so that the universality is poor and the using effect is poor can be solved; the voltage value of the test voltage is regulated by the voltage regulating circuit, so that the regulating range of the voltage value of the test voltage can be increased, and the universality is improved.
In addition, by comparing whether the sampling value and the setting value are matched, it is possible to determine whether the voltage value of the test voltage is a voltage value desired by the user, thereby improving accuracy.
In addition, under the condition that the sampling value and the setting value are not matched, the voltage regulating circuit regulates the test voltage so as to enable the voltage value of the test voltage to be matched with the voltage value expected by a user, and therefore the use effect can be improved.
In addition, by arranging the current protection module, the power supply is turned off in time when the load circuit is short-circuited, so that the damage of the voltage control circuit is avoided, the service life of the voltage control circuit is prolonged, and the safety of the voltage control circuit is improved.
In addition, through the cooperation of multinode circuit and homophase amplifier, can further enlarge the accommodation of the voltage value size of test voltage, improve voltage control circuit's commonality.
In addition, the filter capacitor can reduce alternating current interference and improve the stability of the voltage control circuit.
The foregoing description is only an overview of the technical solutions of the present application, and in order to make the technical means of the present application more clearly understood, it can be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present application will be given with reference to the accompanying drawings.
Drawings
Fig. 1 is a circuit schematic diagram of a voltage control circuit according to an embodiment of the present application.
Detailed Description
The detailed description of the present application is further described in detail below with reference to the drawings and examples. The following examples are illustrative of the present application, but are not intended to limit the scope of the present application.
When testing the screen in the traditional technology, two schemes including a negative power supply test and a positive power supply test are included, and the negative power supply is safer during the negative power supply test because the negative voltage output by the negative power supply is lower. Therefore, in one negative voltage control circuit scheme, the voltage control circuit is arranged in the universal screen test board, the negative power supply is connected into the universal screen test board to output negative voltage to the negative voltage chip, the negative voltage chip regulates test voltage used for voltage control test, and the test voltage is output to the tested screen circuit.
However, the voltage adjusting range of the negative voltage chip is-2 to-6V, and the voltage range used for screen test is-1 to-10V, so that the universality of the negative voltage chip is poor, the universality of the voltage control circuit is poor, and the use effect of the universal screen test board is poor.
Based on this, the application provides a voltage control circuit which can be used in a universal screen test board to improve the voltage range that the universal screen test board can regulate. In practical application, the voltage control circuit can be used in the scenes of wireless, microwave, base station, optical communication, signal interfaces among different analog modules and the like, and the embodiment does not limit the application scene of the voltage control circuit. The voltage control circuit is described below.
Fig. 1 is a schematic circuit diagram of a voltage control circuit according to an embodiment of the present application, and as can be seen from fig. 1, the power control circuit at least includes: a voltage conversion module 110, a control module 120, and a voltage regulation module 130.
The voltage conversion module 110 receives a positive voltage of the external power supply to convert the positive voltage into a negative voltage, thereby obtaining a test voltage. The test voltage is a voltage output to the load circuit when the load circuit is tested.
Specifically, the port VIN is used for accessing an external power supply, the voltage conversion module 110 includes a buck dc converter DCDC, the ground terminal OUT of the voltage conversion module 110 is grounded, the input terminal IN of the voltage conversion module 110 is used for receiving a positive voltage output by the external power supply, and the output terminal GND of the voltage conversion module 110 is connected to the load circuit to output the test voltage VNEG to the load circuit.
The voltage conversion module 110 converts the positive voltage input by the external power supply into the negative voltage to output, so that the negative voltage is used when testing the load circuit, and the safety of the voltage control circuit can be improved.
Since the voltage conversion module 110 is activated when the load voltage is not being tested, power is wasted.
Thus, optionally, the voltage control circuit further comprises: the isolation module 140.
Specifically, the first input terminal 1 of the isolation module 140 is connected to the second output terminal of the control module 120, so as to receive the first enable signal output by the control module 120; the output terminal 3 of the isolation module 140 is connected to the enable terminal EN of the voltage conversion module 110, so that the voltage conversion module 110 is started by outputting a power-on signal to the voltage conversion module 110 through the enable terminal EN when the first enable signal is received.
Optionally, the first enable signal is generated when the control module 120 is powered up. In actual implementation, the control module 120 may generate the first enable signal when receiving a control instruction input by another device, and the embodiment does not limit the generation manner of the first enable signal.
For example, the isolation module 140 includes a photo coupler U1, the second input end 4 of the photo coupler U1 is connected to an external power supply, and a current limiting resistor R8 is connected in series between the input end of the photo coupler U1 and the external power supply to limit the current input by the external power supply to the isolation module 140; the first input end 1 of the photoelectric coupler U1 is connected with the control module 120 to receive a first enabling signal output by the control module 120, and a current limiting resistor R9 is connected in series between the first input end 1 and the control module 120; the grounding end 2 of the photoelectric coupler U1 is grounded, one end of the pull-down resistor R10 is connected with the first input end 1, and the other end of the pull-down resistor R10 is connected with the grounding end 2 so as to pull down an unstable level output by the control unit, in other words, stabilize a first enabling signal received by the photoelectric coupler U1, thereby ensuring that the photoelectric coupler U1 can work stably and improving the stability of the voltage control circuit; the output terminal 3 of the photo coupler U1 is connected to the enable terminal EN, so that the voltage conversion module 110 is started by outputting a power-on signal to the voltage conversion module 110 through the enable terminal EN when the first enable signal is received.
The isolation module 140 is controlled by the first enable signal output by the control module 120 to output a power-on signal to control the start of the voltage conversion module 110, so that the voltage conversion module 110 is synchronous with the test of the load circuit, and therefore, the electric energy waste can be reduced.
The first output terminal of the control module 120 is connected to the input terminal IN of the voltage adjustment module 130 to output a voltage adjustment signal to the voltage adjustment module 130.
The voltage adjustment signal may be generated when the control module 120 is powered on, or may be generated when it detects that the sampling value does not match a pre-stored set value, which is not limited in this embodiment.
The output terminal of the voltage adjusting module 130 is connected to the feedback terminal FB of the voltage converting module 110, so as to output the voltage feedback signal VFB to the voltage converting module 110 through the feedback terminal FB when receiving the voltage adjusting signal.
Optionally, the voltage regulation module 130 includes a digital-to-analog converter (Digital to analog converter, DAC), an in-phase amplifier U4 coupled to the digital-to-analog converter DAC, and a multi-node circuit coupled to the in-phase amplifier U4.
Specifically, an input end of the digital-to-analog converter DAC is connected to the control module 120, and an output end of the digital-to-analog converter DAC is connected to an input end of the in-phase amplifier U4, so as to output a first voltage regulation signal to the in-phase amplifier U4 when receiving the voltage regulation signal; the in-phase amplifier U4 is used for outputting a second voltage regulating signal Vdac to the multi-node circuit under the condition of receiving the first voltage regulating signal; the multi-node circuit is respectively connected with the feedback end, the output end of the voltage conversion module 110 and the ground end of the voltage conversion module 110 to realize the adjustment of the test voltage based on kirchhoff current law, and outputs a voltage feedback signal VFB to the feedback end under the condition of receiving the second voltage regulating signal Vdac.
Specifically, the DAC is configured to convert the received voltage regulation signal and the digital signal into an analog signal, so as to obtain a first voltage regulation signal;
one end IN+ of the IN-phase amplifier U4 is used for receiving the first voltage regulating signal, the other end IN-of the IN-phase amplifier U4 is respectively connected with a resistor R5 and a resistor R4, the other end GND of the resistor R5 is grounded, the other end of the resistor R4 is connected with an output end OUT of the IN-phase amplifier U4 so as to amplify the power of the first voltage regulating signal to obtain a second voltage regulating signal Vdac, and the second voltage regulating signal Vdac is output to the multi-node circuit through the output end OUT of the IN-phase amplifier U4;
the multi-node circuit comprises a resistor R1, a resistor R2 and a resistor R3, wherein one end of the resistor R3 is connected with an output end OUT of the in-phase amplifier U4 so as to receive a second voltage regulating signal Vdac, and the other end of the resistor R3 is connected with a feedback end FB of the voltage conversion module 110; one end of the resistor R2 is connected with the feedback end, and the other end of the resistor R2 is connected with the output end GND of the voltage conversion module 110; one end of the resistor R1 is connected with the feedback end, and the other end of the resistor R1 is connected with the grounding end OUT of the voltage conversion module 110; at this time, based on kirchhoff's law, equation 1 can be obtained:
and wherein, based on the control principle of the direct current converter DCDC, equation 2 can be obtained:
wherein Vref is the reference voltage of the DC converter DCDC, and the voltage value is fixed.
Thus, based on equation 1 and equation 2, equation 3 for calculating the test voltage can be obtained:
as can be seen from equation 3, the test voltage VNEG output by the voltage conversion module 110 can be changed by adjusting the second voltage adjusting signal output by the in-phase amplifier U4 and the resistance values of the resistor R1, the resistor R2 and the resistor R3 in the multi-node circuit.
Therefore, the voltage value of the test voltage output by the voltage conversion module 110 is adjusted by the combination of the multi-node circuit and the in-phase amplifier, so that the adjustment range of the test voltage can be enlarged, and the universality of the voltage control circuit can be improved.
Therefore, when the voltage control circuit adjusts the voltage used by the test load circuit, the voltage conversion module 110 is connected to the external power supply to convert the positive voltage output by the external power supply into the negative voltage, so as to obtain the test voltage, and the test voltage is output to the load circuit; the control module 120 outputs a voltage adjustment signal to the voltage adjustment module 130, the voltage adjustment module 130 outputs a voltage feedback signal to the feedback end of the voltage conversion module 110 when receiving the voltage adjustment signal, and the voltage conversion module 110 is configured to adjust the test voltage based on the voltage value indicated by the voltage feedback signal when receiving the voltage feedback signal at the feedback end, so as to obtain an adjusted test voltage; the voltage conversion module 110 outputs the adjusted test voltage to the load circuit in the case where the adjusted test voltage is obtained.
Through the combined action of the voltage conversion module 110, the control circuit and the voltage regulation module 130, the negative voltage can be used for outputting voltage to the load circuit, so that the carrying capacity of the voltage control circuit is improved, and the safety is improved; meanwhile, the voltage value of the negative voltage can be adjusted, the adjusting range of the voltage value of the negative voltage is enlarged, and therefore the universality can be improved.
Because the voltage value of the test voltage in the voltage control circuit may be different from the voltage value of the test voltage expected by the user, the test of the load circuit is affected, and the use effect of the voltage control circuit is affected.
Optionally, the voltage control circuit further comprises: and a voltage sampling module 150 connected to the output GND of the voltage conversion module 110.
The output terminal OUT of the voltage sampling module 150 is connected to the control module 120 to output a sampling signal to the control module 120 in case that the test voltage is sampled through the output terminal GND of the voltage conversion module 110 to obtain the sampling signal; the control module 120 is further configured to detect whether a sampling value indicated by the sampling signal matches a preset set value, and output a voltage adjustment signal to the voltage adjustment module 130 when the sampling value does not match the set value.
The setting values may be stored in the control module 120 in advance, or may be obtained from other devices, and the implementation of the setting values is not limited in this embodiment.
Specifically, the voltage sampling module 150 includes: an inverting proportional amplifier U3 and an analog-to-digital converter (ADC) connected to the inverting proportional amplifier U3.
The input end IN-of the inverting proportional amplifier U3 is connected with the output end GND of the voltage converter so as to collect test voltage and convert the negative test voltage into positive test voltage; the analog-to-digital converter ADC is used for converting the positive voltage test voltage from an analog signal to a digital signal to obtain a sampling signal; the output of the analog-to-digital converter ADC is connected to the input of the control module 120 to output the sampled signal to the control module 120.
One end in+ of the inverting proportional amplifier U3 is grounded, one end of the resistor R6 is connected with the input end IN-of the inverting proportional amplifier U3, and the other end of the resistor R6 is connected with the output end GND of the voltage conversion module 110; one end of the resistor R7 is connected with the input end IN-of the inverting proportional amplifier U3, and the other end of the resistor R7 is connected with the output end OUT of the inverting proportional amplifier U3.
Since the control module 120 cannot directly receive the analog signal, the analog signal is converted into the digital signal by using the analog-to-digital converter.
The voltage sampling module 150 samples the test voltage and outputs the sampled value to the control module 120, and the set value is compared with the sampled value to determine whether the test voltage is the test voltage expected by the user, and if the test voltage does not match the user's expected test voltage, a voltage feedback signal is output to adjust the test voltage, so that the influence on the load circuit can be avoided, and the use effect can be improved.
Because the load circuit may have a short circuit in the test process, the short circuit of the load circuit may cause the current in the voltage control circuit to increase along with the increase of the current in the load circuit, which may cause the damage of the voltage control circuit.
To improve the safety of the voltage control circuit, optionally, the voltage control circuit further comprises: a circuit protection module 160.
The input end of the circuit protection module 160 is connected with the input end of the load circuit, the circuit protection module 160 is used for collecting the current value of the load circuit, and outputting a circuit abnormality signal to the control module 120 under the condition that the current value is greater than a preset maximum current value; the control unit is further configured to output a second enable signal to the isolation module 140 when the circuit abnormality signal is received; the isolation module 140 is further configured to output a down signal to the voltage conversion module 110 through the enable terminal to turn off the voltage conversion module 110 when the second enable signal is received.
Specifically, referring to fig. 1, the circuit protection module 160 includes: current sampler U2.
The current sampler U2 includes a resistor R shot, one end of the resistor R shot is connected to the output end GND of the voltage conversion module 110, the other end of the resistor R shot is connected to the input end of the load circuit, one end IN-of the current sampler U2 and the other end in+ of the current sampler U2 are respectively connected to two ends of the resistor R shot to collect the current at two ends of the resistor R shot, and when the current value is greater than the maximum current value, the current sampler is connected to the analog-to-digital converter ADC IN the voltage sampling module 150 to convert the analog signal into a digital signal, thereby outputting a circuit abnormal signal to the control module 120 to indicate a short circuit of the load circuit.
The circuit protection circuit is used for detecting whether the load circuit is short-circuited, and under the condition of short-circuited, the voltage converter is controlled to be powered down so as to turn off the power supply to avoid the damage of the voltage control circuit, so that the safety of the voltage control circuit can be further improved.
Since the current input by the external power supply is usually mixed with ac interference, the voltage control circuit optionally further comprises: a first filter capacitor C1 and a second filter capacitor C2.
The first filter capacitor C1 is connected to the input end of the external power supply to filter positive voltage input by the external power supply; the second filter capacitor C2 is connected to the output terminal of the voltage conversion module 110, so as to filter the test voltage output by the voltage conversion module 110 and the adjusted test voltage.
The filter capacitor eliminates the alternating current part, so that the output current is smoother, the influence of alternating current on the voltage control circuit is reduced, and the stability of the voltage control circuit can be improved.
Alternatively, the voltage control circuit is integrated in the same chip.
Optionally, the voltage control circuit is used in a universal screen test board, and the universal screen test board includes at least one voltage control circuit, so as to realize the adjustment of the voltage value of the test voltage, and improve the universality of the universal screen test board.
In this embodiment, the voltage control circuit includes: the voltage conversion module receives positive voltage of external voltage to convert the positive voltage into negative voltage to obtain test voltage, a first output end of the control module is connected with an input end of the voltage regulation module to output a voltage regulation signal to the voltage regulation module, an output end of the voltage regulation module is connected with a feedback end of the voltage conversion module to output a voltage feedback signal to the voltage conversion module through the feedback end under the condition that the voltage regulation signal is received, and the voltage conversion module is further used for regulating the test voltage based on a voltage value indicated by the voltage feedback signal under the condition that the voltage feedback signal is received by the feedback end to obtain the regulated test voltage; the output end of the voltage conversion module is connected with the load circuit so as to output the regulated test voltage to the load circuit under the condition that the regulated test voltage is obtained; the problem that the negative pressure special chip is difficult to be suitable for testing part of the screen, so that the universality is poor and the using effect is poor can be solved; the voltage value of the test voltage is regulated by the voltage regulating circuit, so that the regulating range of the voltage value of the test voltage can be increased, and the universality is improved.
In addition, by comparing whether the sampling value and the setting value are matched, it is possible to determine whether the voltage value of the test voltage is a voltage value desired by the user, thereby improving accuracy.
In addition, under the condition that the sampling value and the setting value are not matched, the voltage regulating circuit regulates the test voltage so as to enable the voltage value of the test voltage to be matched with the voltage value expected by a user, and therefore the use effect can be improved.
In addition, by arranging the current protection module, the power supply is turned off in time when the load circuit is short-circuited, so that the damage of the voltage control circuit is avoided, the service life of the voltage control circuit is prolonged, and the safety of the voltage control circuit is improved.
In addition, through the cooperation of multinode circuit and homophase amplifier, can further enlarge the accommodation of the voltage value size of test voltage, improve voltage control circuit's commonality.
In addition, the filter capacitor can reduce alternating current interference and improve the stability of the voltage control circuit.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples merely represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the invention. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (7)
1. A voltage control circuit, the voltage control circuit comprising: the device comprises a voltage conversion module, a control module and a voltage regulation module;
the voltage conversion module receives positive voltage of an external power supply to convert the positive voltage into negative voltage so as to obtain test voltage;
the first output end of the control module is connected with the input end of the voltage regulation module so as to output a voltage regulation signal Vdac to the voltage regulation module;
the output end of the voltage regulating module is connected with the feedback end of the voltage converting module so as to output a voltage feedback signal VFB to the voltage converting module through the feedback end under the condition of receiving the voltage regulating signal;
the voltage conversion module is further used for adjusting the test voltage based on a voltage value indicated by the voltage feedback signal under the condition that the feedback end receives the voltage feedback signal, so as to obtain an adjusted test voltage; the output end of the voltage conversion module is connected with a load circuit so as to output the regulated test voltage VNEG to the load circuit under the condition that the regulated test voltage is obtained;
the voltage regulating module comprises a digital-to-analog converter, an in-phase amplifier connected with the digital-to-analog converter and a multi-node circuit connected with the in-phase amplifier;
the input end of the digital-to-analog converter is connected with the control module, and the output end of the digital-to-analog converter is connected with the input end of the in-phase amplifier so as to output a first voltage regulating signal to the in-phase amplifier under the condition that the voltage regulating signal is received;
the in-phase amplifier is used for outputting a second voltage regulating signal to the multi-node circuit under the condition that the first voltage regulating signal is received;
the multi-node circuit is respectively connected with the feedback end, the output end of the voltage conversion module and the grounding end of the voltage conversion module so as to realize the adjustment of the test voltage based on kirchhoff current law, and the voltage feedback signal is output to the feedback end under the condition of receiving the second voltage adjustment signal;
the multinode circuit consists of a resistor R1, a resistor R2 and a resistor R3, wherein one end of the resistor R3 is connected with the output end of the in-phase amplifier so as to receive a second voltage regulating signal Vdac, and the other end of the resistor R3 is connected with the feedback end of the voltage conversion module; one end of the resistor R2 is connected with the feedback end, and the other end of the resistor R2 is connected with the output end of the voltage conversion module; one end of the resistor R1 is connected with the feedback end, and the other end of the resistor R1 is connected with the grounding end of the voltage conversion module; based on kirchhoff's law the following formula is derived:
and wherein the following formula is derived based on the control principle of the direct current converter DCDC:
wherein Vref is the reference voltage of the DC converter DCDC, and the voltage value is fixed;
thus, the following formula for calculating the test voltage is derived based on the above formula:
；
the voltage control circuit further includes: the voltage sampling module is connected with the output end of the voltage conversion module;
the output end of the voltage sampling module is connected with the control module so as to output the sampling signal to the control module under the condition that the sampling signal is obtained by sampling the test voltage through the output end of the voltage conversion module;
the control module is also used for detecting whether a sampling value indicated by the sampling signal is matched with a preset set value or not, and outputting the voltage regulating signal to the voltage regulating module under the condition that the sampling value is not matched with the set value;
the voltage sampling module includes: an inverting proportional amplifier and an analog-to-digital converter connected with the inverting proportional amplifier;
the input end of the inverting proportional amplifier is connected with the output end of the voltage conversion module so as to collect the test voltage and convert the negative test voltage into a positive test voltage;
the analog-to-digital converter is used for converting the positive voltage test voltage from an analog signal to a digital signal to obtain a sampling signal; the output end of the analog-to-digital converter is connected with the input end of the control module so as to output the sampling signal to the control module.
2. The voltage control circuit of claim 1, wherein the voltage control circuit further comprises: an isolation module;
the first input end of the isolation module is connected with the second output end of the control module so as to receive a first enabling signal output by the control module; the output end of the isolation module is connected with the enabling end of the voltage conversion module, so that under the condition that the first enabling signal is received, a power-on signal is output to the voltage conversion module through the enabling end, and the voltage conversion module is started.
3. The voltage control circuit of claim 2, wherein the isolation module comprises a photo coupler.
4. The voltage control circuit of claim 2, wherein the voltage control circuit further comprises: a current protection module;
the input end of the current protection module is connected with the input end of the load circuit, and the current protection module is used for collecting the current value of the load circuit and outputting a circuit abnormality signal to the control module under the condition that the current value is larger than a preset maximum current value;
the control module is further used for outputting a second enabling signal to the isolation module under the condition that the circuit abnormal signal is received;
the isolation module is further configured to output a down-going signal to the voltage conversion module through the enable terminal under the condition that the second enable signal is received, so that the voltage conversion module is turned off.
5. The voltage control circuit of claim 1, wherein the voltage control circuit further comprises: a first filter capacitor and a second filter capacitor;
the first filter capacitor is connected to the input end of the external power supply to filter positive voltage input by the external power supply;
the second filter capacitor access is connected with the output end of the voltage conversion module so as to filter the test voltage output by the voltage conversion module and the regulated test voltage.
6. The voltage control circuit of claim 1, wherein the voltage control circuit is integrated in the same chip.
7. A universal screen test board comprising at least one voltage control circuit comprising the voltage control circuit of any one of claims 1-6.
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| CN202310716706.7A CN116682338B (en) | 2023-06-16 | 2023-06-16 | Voltage control circuit and universal screen test board |
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Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002176768A (en) * | 2000-09-28 | 2002-06-21 | Fuji Electric Co Ltd | Power circuit |
| CN105679230A (en) * | 2016-04-25 | 2016-06-15 | 京东方科技集团股份有限公司 | Display driving circuit, driving method of display driving circuit, and display device |
| CN106535390A (en) * | 2016-10-09 | 2017-03-22 | 深圳创维－Rgb电子有限公司 | Constant current driving power supply and display equipment |
| CN107546981A (en) * | 2017-09-01 | 2018-01-05 | 歌尔股份有限公司 | A kind of power circuit |
| CN107681464A (en) * | 2017-09-01 | 2018-02-09 | 歌尔股份有限公司 | A kind of power circuit |
| CN112187024A (en) * | 2020-09-27 | 2021-01-05 | 上海新进芯微电子有限公司 | Switching power supply and output power regulation and control circuit and method thereof |
| CN112653326A (en) * | 2020-12-24 | 2021-04-13 | 珠海禅光科技有限公司 | Automatic voltage regulating circuit |
| CN217904001U (en) * | 2022-07-14 | 2022-11-25 | 深圳市汇川技术股份有限公司 | Output overcurrent protection circuit and device |
| CN218122535U (en) * | 2022-07-28 | 2022-12-23 | 深圳市得辉达智能科技有限公司 | Voltage regulation protection circuit |
| CN115793766A (en) * | 2022-12-23 | 2023-03-14 | 哲库科技(北京)有限公司 | Voltage control circuit, method, chip, terminal and readable storage medium |
-
2023
- 2023-06-16 CN CN202310716706.7A patent/CN116682338B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002176768A (en) * | 2000-09-28 | 2002-06-21 | Fuji Electric Co Ltd | Power circuit |
| CN105679230A (en) * | 2016-04-25 | 2016-06-15 | 京东方科技集团股份有限公司 | Display driving circuit, driving method of display driving circuit, and display device |
| CN106535390A (en) * | 2016-10-09 | 2017-03-22 | 深圳创维－Rgb电子有限公司 | Constant current driving power supply and display equipment |
| CN107546981A (en) * | 2017-09-01 | 2018-01-05 | 歌尔股份有限公司 | A kind of power circuit |
| CN107681464A (en) * | 2017-09-01 | 2018-02-09 | 歌尔股份有限公司 | A kind of power circuit |
| CN112187024A (en) * | 2020-09-27 | 2021-01-05 | 上海新进芯微电子有限公司 | Switching power supply and output power regulation and control circuit and method thereof |
| CN112653326A (en) * | 2020-12-24 | 2021-04-13 | 珠海禅光科技有限公司 | Automatic voltage regulating circuit |
| CN217904001U (en) * | 2022-07-14 | 2022-11-25 | 深圳市汇川技术股份有限公司 | Output overcurrent protection circuit and device |
| CN218122535U (en) * | 2022-07-28 | 2022-12-23 | 深圳市得辉达智能科技有限公司 | Voltage regulation protection circuit |
| CN115793766A (en) * | 2022-12-23 | 2023-03-14 | 哲库科技(北京)有限公司 | Voltage control circuit, method, chip, terminal and readable storage medium |
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| CN116682338A (en) | 2023-09-01 |
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