CN111277134A - Voltage conversion circuit and display device - Google Patents
Voltage conversion circuit and display device Download PDFInfo
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- CN111277134A CN111277134A CN202010071786.1A CN202010071786A CN111277134A CN 111277134 A CN111277134 A CN 111277134A CN 202010071786 A CN202010071786 A CN 202010071786A CN 111277134 A CN111277134 A CN 111277134A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/06—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using resistors or capacitors, e.g. potential divider
Abstract
The invention provides a voltage conversion circuit and a display device, belongs to the technical field of display, and can solve the problems that the output voltage of the conventional voltage conversion circuit is low in regulation range and low in regulation precision. The voltage conversion circuit of the present invention includes: a conversion unit for converting an input voltage into an output voltage and outputting the output voltage; the adjusting unit is used for generating an adjusting voltage according to the control instruction; and the feedback unit is used for generating the pre-output voltage according to the output voltage and the regulating voltage and feeding the pre-output voltage back to the conversion unit so that the conversion unit adjusts the pre-output voltage according to the reference voltage to obtain the adjusted output voltage for outputting.
Description
Technical Field
The invention belongs to the technical field of display, and particularly relates to a voltage conversion circuit and a display device.
Background
A DC/DC Direct-current voltage conversion circuit (Direct current-Direct current converter) is a voltage conversion circuit that converts a Direct-current high voltage (low voltage) into a Direct-current low voltage (high voltage).
The inventor finds that at least the following problems exist in the prior art: the output voltage converted by the DC/DC direct voltage conversion circuit is generally a fixed voltage value or the voltage value of the output voltage needs to be manually adjusted, so the adjustment range of the output voltage of the DC/DC direct voltage conversion circuit in the prior art is low, the adjustment accuracy is low, and the requirement of the display device for the output voltage cannot be met.
Disclosure of Invention
The present invention is directed to at least one of the problems of the prior art, and provides a voltage converting circuit and a display device.
The technical scheme adopted for solving the technical problem of the invention is a voltage conversion circuit, which comprises:
a conversion unit for converting an input voltage into an output voltage and outputting the output voltage;
the adjusting unit is used for generating an adjusting voltage according to the control instruction;
and the feedback unit is used for generating a pre-output voltage according to the output voltage and the regulating voltage and feeding back the pre-output voltage to the conversion unit so that the conversion unit adjusts the pre-output voltage according to the reference voltage to obtain an adjusted output voltage for outputting.
Optionally, the adjusting unit includes: a controller and a digital-to-analog converter;
the controller is connected with the digital-to-analog converter and used for generating a digital signal according to the control instruction and inputting the digital signal into the digital-to-analog converter;
the digital-to-analog converter is connected with the feedback unit and used for converting the digital signal into regulated voltage and inputting the regulated voltage into the feedback unit.
Optionally, the feedback unit includes: a first resistor and a second resistor;
one end of the first resistor is connected with the conversion unit and a power supply voltage output end, and the other end of the first resistor is connected with the conversion unit and one end of the second resistor;
one end of the second resistor is connected with the other end of the first resistor and the conversion unit, and the other end of the second resistor is connected with the digital-to-analog converter.
Optionally, the voltage conversion circuit further includes: a first filtering unit;
the first filtering unit is used for filtering the input voltage.
Optionally, the first filtering unit includes: a first capacitor;
one end of the first capacitor is connected with the power supply voltage input end and the conversion unit, and the other end of the first capacitor is connected with the conversion unit and grounded.
Optionally, the voltage conversion circuit further includes: a second filtering unit;
the second filtering unit is used for filtering the output voltage.
Optionally, the second filtering unit includes: an inductor and a second capacitor;
one end of the inductor is connected with the conversion unit, and the other end of the inductor is connected with one end of the first resistor, one end of the second capacitor and the power supply voltage output end;
one end of the second capacitor is connected with the other end of the inductor, one end of the first resistor and the power supply voltage output end.
Optionally, the conversion unit includes a conversion chip; the conversion chip has: the circuit comprises an input end, an enable end, a grounding end, an output end and a feedback end; the input end with enable end short circuit connects the mains voltage input end, the earthing terminal ground connection, the output is connected the one end of inductance, the feedback end is connected the other end of first resistance with the one end of second resistance.
Optionally, the conversion chip includes: the device comprises a starting module, a conversion module, a comparison module and a reference voltage module;
the control signal input end of the starting module is used as the enabling end;
a voltage input end and a voltage output end of the conversion module are respectively used as the input end and the output end;
the positive input end of the comparison module is used as the feedback end, the negative input end of the comparison module is connected with the reference voltage module, and the signal output end of the comparison module is connected with the conversion module.
The technical scheme adopted for solving the technical problem of the invention is a voltage conversion circuit, which comprises: the circuit comprises a first capacitor, a second capacitor, a conversion chip, an inductor, a first resistor, a second resistor, a controller and a digital-to-analog converter; the conversion chip is provided with an input end, an enable end, a grounding end, an output end and a feedback end;
one end of the first capacitor is connected with a power supply voltage input end, the input end and the enable end, and the other end of the first capacitor is connected with the grounding end and grounded;
the input end of the conversion chip is in short circuit with the enable end and is connected with the power supply voltage input end and one end of the first capacitor, the grounding end is connected with the other end of the first capacitor and is grounded, the output end is connected with one end of the inductor, and the feedback end is connected with the other end of the first resistor and one end of the second resistor;
one end of the inductor is connected with the output end, and the other end of the inductor is connected with one end of the first resistor, one end of the second capacitor and the power supply voltage output end;
one end of the second capacitor is connected with the other end of the inductor, one end of the first resistor and the power supply voltage output end;
one end of the first resistor is connected with the other end of the inductor, one end of the second capacitor and the power supply voltage output end, and the other end of the first resistor is connected with the feedback end and one end of the second resistor;
one end of the second resistor is connected with the other end of the first resistor and the feedback end, and the other end of the second resistor is connected with the digital-to-analog converter;
the controller is connected with the digital-to-analog converter;
the digital-to-analog converter is connected with the other end of the second resistor.
The technical scheme adopted for solving the technical problem of the invention is a display device which comprises the voltage conversion circuit.
Drawings
Fig. 1 and fig. 3 are schematic structural diagrams of a voltage conversion circuit according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an implementation principle of a voltage conversion circuit according to an embodiment of the present invention.
Wherein the reference numerals are: 101-conversion unit, 102-regulation unit, 103-feedback unit, 104-first filtering unit, 105-second filtering unit, 1021-controller, 1022-digital-analog converter, Vin 1-power voltage input terminal, Vout 1-power voltage output terminal, R1-first resistor, R2-second resistor, C1-first capacitor, L-inductor, C2-second capacitor, Vin 2-input terminal, EN-enable terminal, GND-ground terminal, Vout 2-output terminal, and FB-feedback terminal.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Example one
Fig. 1 is a schematic structural diagram of a voltage conversion circuit according to an embodiment of the present invention, as shown in fig. 1, the voltage conversion circuit includes: a conversion unit 101, an adjustment unit 102 and a feedback unit 103. The conversion unit 101 is configured to convert an input voltage into an output voltage and output the output voltage. The adjusting unit 102 is configured to generate an adjusting voltage according to the control instruction. The feedback unit 103 is configured to generate a pre-output voltage according to the output voltage and the regulated voltage, and feed back the pre-output voltage to the conversion unit 101, so that the conversion unit 101 adjusts the pre-output voltage according to the reference voltage, and obtains an adjusted output voltage for output.
In the voltage conversion circuit provided by the embodiment of the present invention, the input voltage may be input to the conversion unit 101 through the power voltage input terminal Vin1, and the conversion unit 101 may convert the input voltage into an output voltage, where the output voltage may be a pulse voltage with a certain amplitude, or may be further converted into a direct current voltage, so as to provide a power voltage for other components. The regulating unit 102 may generate a regulating voltage according to the control instruction. The feedback unit 103 may generate a pre-output voltage from the output voltage of the power supply voltage output terminal Vout1 and the regulation voltage generated by the regulation unit 102, and feed back the pre-output voltage to the conversion unit 101. After receiving the pre-output voltage, the converting unit 101 may adjust the pre-output voltage according to the reference voltage, and output the adjusted output voltage. Thus, on the basis of the original voltage conversion circuit, the adjustment of the output voltage of the conversion unit 101 can be realized only by applying the adjustment voltage to the conversion unit 101 through the feedback unit 103 by using the adjustment unit 102, and other additional components are not required to be added, so that the complexity of adjusting the voltage in the existing voltage conversion circuit can be simplified, the reliability of the circuit can be improved, and the design and manufacturing cost of the circuit can be saved.
Optionally, the adjusting unit 102 includes: a controller 1021 and a digital-to-analog converter 1022; the controller 1021 is connected to the digital-to-analog converter 1022, and is configured to generate a digital signal according to the control instruction, and input the digital signal to the digital-to-analog converter; the digital-to-analog converter 1022 is connected to the feedback unit 103, and is configured to convert the digital signal into a regulated voltage, and input the regulated voltage to the feedback unit.
It should be noted that the adjusting unit 102 may specifically be composed of a digital-to-analog converter 1022 controlled by the controller 1021. The controller 1021 may be a Microcontroller Unit (MCU), or a Central Processing Unit (CPU), and may be connected to the digital-to-analog converter 1022 through a Serial Peripheral Interface (SPI) or other bus, and in this embodiment of the present invention, an MCU may be preferred. The user can input a control command to the controller 1021 according to actual needs. The controller 1021 can generate a digital signal according to a control instruction input by a user, and input the digital signal to the digital-to-analog converter 1022. The digital-to-analog converter 1022 may convert the digital signal input by the controller 1021 into an analog signal that can be recognized by the voltage conversion circuit, i.e., a regulated voltage, and input the regulated voltage into the feedback unit 103, so that the conversion unit 101 may adjust the pre-output voltage according to the reference voltage, thereby obtaining and outputting the adjusted output voltage. It is understood that, in the embodiment of the present invention, the adjusting unit 102 may also be formed by a Pulse Width Modulation (PWM) circuit or an R-2R resistor network, and the implementation principle thereof is similar to the above implementation principle, and is not described herein again.
Optionally, the feedback unit 103 includes: a first resistor R1 and a second resistor R2. One end of the first resistor R1 is connected to the switching unit 101 and the power supply voltage output terminal Vout1, and the other end is connected to the switching unit 101 and one end of the second resistor R2; one end of the second resistor R2 is connected to the other end of the first resistor R1 and the converting unit 101, and the other end is connected to the digital-to-analog converter 1022.
It should be noted that, when the pre-output voltage Vfb of the input conversion unit 101 is decomposed into the regulated voltage Vdac and the output voltage Vout1 to be applied to the circuits, respectively, according to the voltage superposition principle, the pre-output voltage Vfb may be the sum of Vfb1 and Vfb 2. As shown in fig. 2, the pre-output voltage Vfb may be: Vfb-Vfb 1+ Vfb2 ═ Vout1R2/(R1+ R2) + VdacR1/(R1+ R2), and thus, it can be obtained that Vout1 ═(Vfb (R1+ R2) -VdacR 1)/R2, as can be seen from the above, the factors affecting the output voltage Vout1 include the resistance values of the first resistor R1 and the second resistor R2 in the feedback unit 103, and the regulated voltage Vdac output by the regulating unit 102, so that the regulation of the output voltage Vout1 in the voltage conversion circuit can be realized by changing the regulated voltage Vdac output by the regulating unit 102, and no additional component needs to be added in the whole circuit, so that the complexity of the regulated voltage in the existing voltage conversion circuit can be simplified, and the reliability of the circuit can be improved, and the circuit design and manufacturing cost can be saved.
For the adjustment range of the output voltage Vout1, when Vdac is 0, the entire voltage conversion circuit can reach the maximum output voltage, i.e., Vfb (R1+ R2)/R2; when Vdac is Vfb (R1+ R2)/R1, the entire voltage conversion circuit can reach the minimum output voltage of 0V. In practical applications, if the influence of the output resistance Rout of the dac 1022 on the whole circuit is considered, then Vout1 is (Vfb (R1+ R2+ Rout) -VdacR 1)/(R2+ Rout), then the maximum output voltage is Vfb (R1+ R2+ Rout)/(R2+ Rout), and the minimum output voltage is 0V. Therefore, the voltage conversion circuit provided by the embodiment of the invention can realize a larger voltage adjustment range.
For the regulation accuracy of the output voltage Vout1, regardless of the influence of temperature, resistance accuracy and other factors on the circuit, assuming that the step voltage of Vdac is Vstep, the step voltage of Vout1 is Vstep · R1/R2. Assuming that the precision of the digital-to-analog converter in the effective output range is 14bit, the maximum output voltage Vout1 of the voltage conversion circuit is 24 volts (V), and the pre-output voltage Vfb is 1.25V, then R1/R2 is 18.2, in this case, the Vout step voltage is 18.2 · Vstep, that is, the output precision of about 10bit is achieved, and if the precision cannot meet the actual requirement, the precision of the digital-to-analog converter only needs to be improved, that is, the precision of the output voltage Vout1 can be correspondingly improved. Therefore, the voltage conversion circuit provided by the embodiment of the invention can realize the accurate adjustment of the output voltage Vout 1.
Optionally, the voltage conversion circuit further comprises: a first filtering unit 104. The first filtering unit 104 is used for filtering the input voltage.
It should be noted that the first filtering unit 104 may filter the voltage input by the supply voltage input terminal Vin1, and may filter a voltage that may cause interference to the converting unit 101 from the voltage input by the supply voltage input terminal Vin1, so as to reduce the interference of the input voltage on the performance of the converting unit 101.
Optionally, the first filtering unit 104 includes: a first capacitor C1. One end of the first capacitor C1 is connected to the power voltage input terminal Vin1 and the converting unit 101, and the other end is connected to the converting unit 101 and grounded.
It should be noted that, in practical applications, the first filtering unit 104 may include a first capacitor C1, and due to the characteristics of the capacitor itself, the first capacitor C1 may filter the ac voltage portion of the input voltage, so as to reduce the interference on the performance of the converting unit 101.
Optionally, the voltage conversion circuit further comprises: a second filtering unit 105. The second filtering unit 102 is used for filtering the output voltage.
It should be noted that the converting unit 101 may convert an input voltage into an output voltage, where the output voltage may be a pulse voltage having a certain amplitude, and the second filtering unit 105 may filter the pulse voltage and filter an interference voltage in the pulse voltage, so as to form a desired dc voltage.
Optionally, the second filtering unit 105 includes: an inductance L and a second capacitance C2. One end of the inductor L is connected to the converting unit 101, and the other end is connected to one end of the first resistor R1, one end of the second capacitor C2, and the power supply voltage output terminal Vout 1; one end of the second capacitor C2 is connected to the other end of the inductor L, one end of the first resistor R1, and the power supply voltage output terminal Vout 1.
It should be noted that the inductor L and the second capacitor C2 may form an LC resonant circuit, and may separate a required dc voltage from the pulse voltage, so that the dc voltage may be output through the power supply voltage output terminal Vout1, and further, the dc voltage may be used to provide a power supply voltage for other components.
Optionally, the conversion unit 101 includes a conversion chip; the conversion chip has: an input terminal Vin2, an enable terminal EN, a ground terminal GND, an output terminal Vout2 and a feedback terminal FB; the input terminal Vin2 is shorted with the enable terminal EN and connected to the power voltage input terminal Vin1, the ground terminal GND is grounded, the output terminal Vout2 is connected to one end of the inductor L, and the feedback terminal FB is connected to the other end of the first resistor R1 and one end of the second resistor R2.
It should be noted that the conversion chip can convert the input voltage into the output voltage, and adjust the output voltage according to the voltage of the feedback terminal FB. When the output voltage of the voltage conversion circuit does not need to be adjusted, the voltage of the feedback terminal FB of the conversion chip is generally equal to the reference voltage, and the output voltage is a constant value. When the output voltage needs to be adjusted, the output voltage and the regulated voltage can be input to the feedback terminal FB through the first resistor R1 and the second resistor R2, and the output voltage is accurately adjusted according to the reference voltage.
Optionally, the conversion chip comprises: the device comprises a starting module, a conversion module, a comparison module and a reference voltage module; the control signal input end of the starting module is used as an enabling end EN; the voltage input end and the voltage output end of the conversion module are respectively used for an input end Vin2 and an output end Vout 2; the positive input end of the comparison module is used as a feedback end FB, the negative input end of the comparison module is connected with the reference voltage module, and the signal output end of the comparison module is connected with the conversion module.
It should be noted that the start module may control the conversion chip to start and operate when the start voltage is input to the control signal input terminal. The conversion module may convert an input voltage into an output voltage, and the output voltage may have a pulse voltage with a certain amplitude. The comparison module can compare a pre-output voltage formed by the output voltage and the regulated voltage with a reference voltage provided by the reference voltage module, generate a pre-output voltage according to the reference voltage, and feed back the pre-output voltage to the conversion module. The reference voltage module may provide a reference voltage for the comparison module, where the reference voltage may be 1.2V, or may be other voltage values, and the voltage values of the reference voltage may be set according to actual needs, which are not listed here.
Example two
Fig. 3 is a voltage conversion circuit according to an embodiment of the present invention, where the voltage conversion circuit includes: a first capacitor C1, a second capacitor C2, a conversion chip, an inductor L, a first resistor R1, a second resistor R2, a controller 1021, and a digital-to-analog converter 1022; the conversion chip has an input terminal Vin2, an enable terminal EN, a ground terminal GND, an output terminal Vout2, and a feedback terminal FB.
One end of the first capacitor C1 is connected to the power voltage input terminal Vin1, the input terminal Vin2 and the enable terminal EN, and the other end is connected to the ground terminal GND and grounded; an input end Vin2 and an enable end EN of the conversion chip are in short circuit and connected with a power voltage input end Vin1 and one end of a first capacitor C1, a ground end GND is connected with the other end of the first capacitor C1 and grounded, an output end Vout2 is connected with one end of an inductor L, and a feedback end FB is connected with the other end of a first resistor R1 and one end of a second resistor R2; one end of the inductor L is connected with the output end Vout2, and the other end is connected with one end of the first resistor R1, one end of the second capacitor C2 and the power supply voltage output end Vout 1; one end of the second capacitor C2 is connected with the other end of the inductor L, one end of the first resistor R1 and the power supply voltage output terminal Vout 1; one end of the first resistor R1 is connected with the other end of the inductor L, one end of the second capacitor C2 and the power supply voltage output end Vout1, and the other end is connected with the feedback end FB and one end of the second resistor R2; one end of the second resistor R2 is connected to the other end of the first resistor R1 and the feedback terminal FB, and the other end is connected to the digital-to-analog converter 1022; the controller 1021 is connected to the digital-to-analog converter 1022; the digital-to-analog converter 1022 is connected to the other end of the second resistor R2.
In the voltage conversion circuit provided by the embodiment of the invention, according to the voltage superposition principle, when the pre-output voltage Vfb input to the conversion chip can be decomposed into the regulated voltage Vdac and the output voltage Vout1 which are respectively applied to the circuit, the pre-output voltage Vfb can be the sum of Vfb1 and Vfb 2. As shown in fig. 2, the pre-output voltage Vfb may be: Vfb-Vfb 1+ Vfb2 ═ Vout1R2/(R1+ R2) + VdacR1/(R1+ R2), and thus, Vout1 ═ Vfb (R1+ R2) -VdacR 1)/R2, as can be seen from the above, factors influencing the output voltage Vout1 include the regulated voltage Vdac output by the digital-to-analog converter 1022 in addition to the resistances of the first resistor R1 and the second resistor R2, so that the regulated voltage Vdac output by the digital-to-analog converter 1022 can be changed by the controller, and the regulation of the output voltage Vout1 in the voltage conversion circuit is realized.
For the adjustment range of the output voltage Vout1, when Vdac is 0, the entire voltage conversion circuit can reach the maximum output voltage, i.e., Vfb (R1+ R2)/R2; when Vdac is Vfb (R1+ R2)/R1, the entire voltage conversion circuit can reach the minimum output voltage of 0V. In practical applications, if the influence of the output resistance Rout of the dac 1022 on the whole circuit is considered, then Vout1 is (Vfb (R1+ R2+ Rout) -VdacR 1)/(R2+ Rout), then the maximum output voltage is Vfb (R1+ R2+ Rout)/(R2+ Rout), and the minimum output voltage is 0V. Therefore, the voltage conversion circuit provided by the embodiment of the invention can realize a larger voltage adjustment range.
For the regulation accuracy of the output voltage Vout1, regardless of the influence of temperature, resistance accuracy and other factors on the circuit, assuming that the step voltage of Vdac is Vstep, the step voltage of Vout1 is Vstep · R1/R2. Assuming that the precision of the digital-to-analog converter in the effective output range is 14bit, the maximum output voltage Vout1 of the voltage conversion circuit is 24V, and the pre-output voltage Vfb is 1.25V, then R1/R2 is 18.2, in this case, the Vout step voltage is 18.2 · Vstep, that is, the output precision of about 10bit is achieved, and if the precision cannot meet the actual requirement, the precision of the digital-to-analog converter is only required to be improved, that is, the precision of the output voltage Vout1 can be correspondingly improved. Therefore, the voltage conversion circuit provided by the embodiment of the invention can realize the accurate adjustment of the output voltage Vout 1.
EXAMPLE III
Based on the same inventive concept, embodiments of the present invention provide a display device including the voltage conversion circuit provided as the above embodiments. The display device can be a mobile phone, a tablet personal computer or terminal equipment such as an intelligent television. The implementation principle is similar to that of the voltage conversion circuit, and is not described herein again.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (11)
1. A voltage conversion circuit, comprising:
a conversion unit for converting an input voltage into an output voltage and outputting the output voltage;
the adjusting unit is used for generating an adjusting voltage according to the control instruction;
and the feedback unit is used for generating a pre-output voltage according to the output voltage and the regulating voltage and feeding back the pre-output voltage to the conversion unit so that the conversion unit adjusts the pre-output voltage according to the reference voltage to obtain an adjusted output voltage for outputting.
2. The voltage conversion circuit of claim 1, wherein the adjustment unit comprises: a controller and a digital-to-analog converter;
the controller is connected with the digital-to-analog converter and used for generating a digital signal according to the control instruction and inputting the digital signal into the digital-to-analog converter;
the digital-to-analog converter is connected with the feedback unit and used for converting the digital signal into regulated voltage and inputting the regulated voltage into the feedback unit.
3. The voltage conversion circuit of claim 2, wherein the feedback unit comprises: a first resistor and a second resistor;
one end of the first resistor is connected with the conversion unit and a power supply voltage output end, and the other end of the first resistor is connected with the conversion unit and one end of the second resistor;
one end of the second resistor is connected with the other end of the first resistor and the conversion unit, and the other end of the second resistor is connected with the digital-to-analog converter.
4. The voltage conversion circuit of claim 3, further comprising: a first filtering unit;
the first filtering unit is used for filtering the input voltage.
5. The voltage conversion circuit of claim 4, wherein the first filtering unit comprises: a first capacitor;
one end of the first capacitor is connected with the power supply voltage input end and the conversion unit, and the other end of the first capacitor is connected with the conversion unit and grounded.
6. The voltage conversion circuit of claim 5, further comprising: a second filtering unit;
the second filtering unit is used for filtering the output voltage.
7. The voltage conversion circuit of claim 6, wherein the second filtering unit comprises: an inductor and a second capacitor;
one end of the inductor is connected with the conversion unit, and the other end of the inductor is connected with one end of the first resistor, one end of the second capacitor and the power supply voltage output end;
one end of the second capacitor is connected with the other end of the inductor, one end of the first resistor and the power supply voltage output end.
8. The voltage conversion circuit of claim 7, wherein the conversion unit comprises a conversion chip; the conversion chip has: the circuit comprises an input end, an enable end, a grounding end, an output end and a feedback end; the input end with enable end short circuit connects the mains voltage input end, the earthing terminal ground connection, the output is connected the one end of inductance, the feedback end is connected the other end of first resistance with the one end of second resistance.
9. The voltage conversion circuit of claim 8, wherein the conversion chip comprises: the device comprises a starting module, a conversion module, a comparison module and a reference voltage module;
the control signal input end of the starting module is used as the enabling end;
a voltage input end and a voltage output end of the conversion module are respectively used as the input end and the output end;
the positive input end of the comparison module is used as the feedback end, the negative input end of the comparison module is connected with the reference voltage module, and the signal output end of the comparison module is connected with the conversion module.
10. A voltage conversion circuit, comprising: the circuit comprises a first capacitor, a second capacitor, a conversion chip, an inductor, a first resistor, a second resistor, a controller and a digital-to-analog converter; the conversion chip is provided with an input end, an enable end, a grounding end, an output end and a feedback end;
one end of the first capacitor is connected with a power supply voltage input end, the input end and the enable end, and the other end of the first capacitor is connected with the grounding end and grounded;
the input end of the conversion chip is in short circuit with the enable end and is connected with the power supply voltage input end and one end of the first capacitor, the grounding end is connected with the other end of the first capacitor and is grounded, the output end is connected with one end of the inductor, and the feedback end is connected with the other end of the first resistor and one end of the second resistor;
one end of the inductor is connected with the output end, and the other end of the inductor is connected with one end of the first resistor, one end of the second capacitor and the power supply voltage output end;
one end of the second capacitor is connected with the other end of the inductor, one end of the first resistor and the power supply voltage output end;
one end of the first resistor is connected with the other end of the inductor, one end of the second capacitor and the power supply voltage output end, and the other end of the first resistor is connected with the feedback end and one end of the second resistor;
one end of the second resistor is connected with the other end of the first resistor and the feedback end, and the other end of the second resistor is connected with the digital-to-analog converter;
the controller is connected with the digital-to-analog converter;
the digital-to-analog converter is connected with the other end of the second resistor.
11. A display device comprising the voltage conversion circuit according to claim 10.
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| CN202010071786.1A CN111277134A (en) | 2020-01-21 | 2020-01-21 | Voltage conversion circuit and display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410985A (en) * | 2021-06-29 | 2021-09-17 | 展讯通信（上海）有限公司 | Direct-current voltage conversion circuit, voltage conversion shunt switch, device and power supply system |
| CN114629498A (en) * | 2022-03-24 | 2022-06-14 | 中国科学院半导体研究所 | Multi-channel digital-to-analog signal converter |
| CN114629498B (en) * | 2022-03-24 | 2024-05-17 | 中国科学院半导体研究所 | Multichannel digital-analog signal converter |
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| CN114629498A (en) * | 2022-03-24 | 2022-06-14 | 中国科学院半导体研究所 | Multi-channel digital-to-analog signal converter |
| CN114629498B (en) * | 2022-03-24 | 2024-05-17 | 中国科学院半导体研究所 | Multichannel digital-analog signal converter |
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Application publication date: 20200612 |