CN111445865B - Output voltage precision control circuit and precision control method applied to AMOLED display - Google Patents
Output voltage precision control circuit and precision control method applied to AMOLED display Download PDFInfo
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- CN111445865B CN111445865B CN202010256314.3A CN202010256314A CN111445865B CN 111445865 B CN111445865 B CN 111445865B CN 202010256314 A CN202010256314 A CN 202010256314A CN 111445865 B CN111445865 B CN 111445865B
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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
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
- G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
- G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
- G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
- G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
- G09G3/3258—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element
Abstract
The invention relates to an output voltage precision control circuit applied to an AMOLED display, which comprises a band gap reference unit; the boost control unit is used for receiving the signal transmitted by the band gap reference unit, eliminating the offset voltage signal generated at the input position of the boost control unit and transmitting the signal to the boost conversion unit; the boost conversion unit is used for receiving the input voltage, boosting the input voltage according to the signal transmitted by the boost control unit and outputting the output voltage; the first buck-boost control unit is used for receiving an externally input control signal, converting an offset voltage signal in the control signal into a high-frequency signal, filtering the high-frequency signal and outputting the control signal; the second buck-boost control unit is used for receiving the first buck-boost control unit, eliminating the offset voltage signal generated at the input position of the second buck-boost control unit and outputting a control signal; and the voltage-boosting and voltage-reducing conversion unit outputs output voltage, wherein the polarity of the output voltage is opposite to that of the input voltage. The invention has the effect of improving the precision of the output voltage.
Description
Technical Field
The invention relates to the technical field of voltage control methods, in particular to an output voltage precision control circuit and a precision control method applied to an AMOLED display.
Background
Currently, AMOLED (Active-matrix organic light-emitting diode, or Active-matrix organic light-emitting diode, in English) is a display screen technology. Among them, OLEDs (organic light emitting diodes) are a specific type describing thin film display technology: organic electroluminescent display; AM (active matrix or active matrix) refers to the pixel addressing technique behind.
The existing voltage stabilizer for the AMOLED display power supply needs to output very high-precision output voltage under all normal working conditions, the precision of the output voltage is generally determined by the reference precision, the error amplification bias and the matching degree of an output feedback resistor voltage divider, the input at the reference precision is improved by the matching degree of the mosfet, and the existing voltage stabilizer generally adopts the mode of increasing the size of the mosfet to improve the matching degree of the mosfet so as to reduce offset voltage.
The above prior art solutions have the following drawbacks: although a mosfet with a larger size is used, the mosfets cannot be completely the same, so that the matching degree still cannot reach a higher level, and an offset voltage inevitably occurs at the input of the amplifier, so that the accuracy of the output voltage is difficult to guarantee.
Disclosure of Invention
In view of the disadvantages of the prior art, an object of the present invention is to provide an output voltage precision control circuit and a precision control method for an AMOLED display, which have the effect of improving the precision of the output voltage.
The above object of the present invention is achieved by the following technical solutions: an output voltage precision control circuit applied to an AMOLED display comprises,
the band-gap reference unit is used for generating a band-gap reference voltage signal for eliminating the offset voltage signal;
the boost control unit is used for receiving the signal transmitted by the band gap reference unit, eliminating the offset voltage signal generated at the input position of the boost control unit and transmitting the signal to the boost conversion unit;
the boost conversion unit is used for receiving the input voltage, boosting the input voltage according to the signal transmitted by the boost control unit and outputting the output voltage;
the first buck-boost control unit is used for receiving an externally input control signal, converting an offset voltage signal in the control signal into a high-frequency signal, filtering the high-frequency signal and outputting the control signal;
the second buck-boost control unit is used for receiving the first buck-boost control unit, eliminating the offset voltage signal generated at the input position of the second buck-boost control unit and outputting a control signal;
and the buck-boost conversion unit is used for receiving the input voltage, boosting or reducing the input voltage according to the control signal transmitted by the second buck-boost control unit, and outputting the output voltage, wherein the polarity of the output voltage is opposite to that of the input voltage.
By adopting the technical scheme, the bandgap reference voltage signal generated by the bandgap reference unit eliminates the offset voltage signal, and the boost control unit receives the bandgap reference voltage signal and eliminates the offset voltage signal generated by the input end of the boost control unit, so that the error of the signal input to the boost conversion unit is small; the first boost control unit converts the offset voltage signal that self input produced into high frequency signal and filters, and the second boost control unit eliminates the offset voltage signal that self input produced to the messenger inputs the signal error of buck-boost converting unit less, thereby has reduced the offset voltage signal, has improved output voltage's precision.
The present invention in a preferred example may be further configured to: the band-gap reference unit comprises a first input stage transistor, a second input stage transistor and a clock chopper amplifier, wherein the output end of the first input stage transistor and the output end of the second input stage transistor are respectively and electrically connected with the two input ends of the clock chopper amplifier, the control end of the first input stage transistor is electrically connected with the control end of the second input stage transistor, and the output end of the clock chopper amplifier is electrically connected with the in-phase end of the boost control unit.
Through adopting above-mentioned technical scheme, first input stage transistor and second input stage transistor and clock chopper amplifier produce band gap reference voltage signal jointly, and clock chopper amplifier converts the offset voltage that the input produced into high frequency signal and filters to make the offset voltage signal in the band gap reference voltage signal reduce, even the size of the transistor of input is less, also be difficult for producing great offset voltage, thereby further save chip area.
The present invention in a preferred example may be further configured to: the boost control unit comprises a first automatic zero setting amplifier, the in-phase end of the first automatic zero setting amplifier is electrically connected with the output end of the clock chopper amplifier, and the inverting end of the first automatic zero setting amplifier is electrically connected with the output end of the boost conversion unit.
By adopting the technical scheme, the offset voltage generated at the input end of the first automatic zero setting amplifier is eliminated after passing through the first automatic zero setting amplifier, so that the offset voltage signal of the input end cannot influence the output control signal, and the precision of the output voltage is guaranteed.
The present invention in a preferred example may be further configured to: the first buck-boost control unit comprises a clock chopping buffer, the in-phase end of the clock chopping buffer is connected with the external input, and the output end of the clock chopping buffer is connected with the anti-phase end of the clock chopping buffer and the second buck-boost control unit.
Through adopting above-mentioned technical scheme, the clock chopping buffer converts the offset voltage that self input produced into high frequency signal, and this high frequency signal and control signal are behind clock chopping buffer, and high frequency signal is filtered, and control signal exports to make the signal that reachs second buck-boost the control unit comparatively accurate.
The invention in a preferred example may be further configured to: the second buck-boost control unit comprises a second automatic zero setting amplifier, the in-phase end of the second automatic zero setting amplifier is grounded, the out-phase end of the second automatic zero setting amplifier is connected with the output end of the clock chopping amplifier and the output end of the clock chopping buffer, and the output end of the second automatic zero setting amplifier is electrically connected with the buck-boost conversion unit.
By adopting the technical scheme, the offset voltage generated at the input end of the second auto-zero amplifier is eliminated after passing through the second auto-zero amplifier, so that the offset voltage signal of the input end cannot influence the output control signal, and the precision of the output voltage is guaranteed.
The above object of the present invention is achieved by the following technical solutions: a method for controlling the precision of output voltage includes such steps as,
generating a band gap reference voltage through a band gap reference unit;
eliminating offset voltage signals generated at the input end of the boost control unit and outputting control signals;
performing feedback control according to a voltage signal at the output end of the boost conversion unit;
acquiring an externally input digital quantity signal, and converting the digital quantity signal into an analog quantity signal;
the offset voltage signal generated at the input end of the first buck-boost control unit is eliminated, and the signal is output to the second buck-boost control unit;
the offset voltage signal generated at the input end of the second buck-boost control unit is eliminated, and the control signal is output;
and performing feedback control according to the voltage signal of the voltage output end.
By adopting the technical scheme, the band gap reference voltage is generated by the band gap reference unit, then the offset voltage at the input end of the boost control unit is eliminated, and then feedback control is performed according to the control signal with the offset voltage signal eliminated, so that the boost operation of the boost conversion unit is realized; the digital quantity of external input is transmitted to first buck-boost control unit after turning into the analog quantity signal, and first buck-boost control unit transmits control signal to second buck-boost control unit after eliminating the maladjustment voltage signal that the input produced, and second buck-boost control unit exports control signal after eliminating the maladjustment voltage signal that the input produced, realizes the operation of buck-boost, and in the control process of whole output voltage, the influence of maladjustment voltage is very little, has ensured output voltage's precision.
The invention in a preferred example may be further configured to: the specific method for generating the bandgap reference voltage through the bandgap reference unit comprises the following steps:
generating a reference precision signal according to an external input;
converting an offset voltage signal generated at the input end of the band-gap reference unit into a high-frequency signal;
filtering out a high-frequency signal mixed in the reference precision signal;
and outputting a band gap reference voltage signal.
By adopting the technical scheme, the reference precision signal is generated according to the external input, then the band-gap reference unit converts the offset voltage signal generated by the input end into the high-frequency signal and filters the high-frequency signal, and the filtered signal is the band-gap reference voltage signal which is finally output, so that the error in the band-gap reference voltage signal is small.
The present invention in a preferred example may be further configured to: the specific method for eliminating the offset voltage signal generated at the input end of the first buck-boost control unit comprises the following steps:
converting an offset voltage signal generated by the input end of the first buck-boost control unit into a high-frequency signal;
high frequency signals mixed in the input analog quantity signal are filtered.
Through adopting above-mentioned technical scheme, the offset voltage that first buck-boost control unit produced the input converts high frequency signal into and filters to make the signal of output comparatively accurate.
In summary, the invention includes at least one of the following beneficial technical effects:
through converting offset voltage into high frequency signal and filtering to make the signal of first buck-boost the output of control unit more pure, through eliminating offset voltage, make the signal of second buck-boost the control unit and step up the output of control unit comparatively pure, thereby make buck-boost the transform unit and step up the transform unit and can carry out better control to output voltage, output voltage's precision can improve.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Fig. 2 is a schematic circuit diagram of the first auto-zero amplifier and the second auto-zero amplifier.
Fig. 3 is a schematic diagram of a circuit structure of the clock chopper amplifier.
Fig. 4 is a flow chart of the steps of the present invention.
Reference numerals: 1. a band gap reference unit; 11. a first input stage transistor; 12. a second input stage transistor; 13. a clock chopper amplifier; 2. a boost control unit; 3. a boost conversion unit; 4. a first buck-boost control unit; 5. a second buck-boost control unit; 6. and a buck-boost conversion unit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, the output voltage precision control circuit applied to the AMOLED display disclosed by the invention comprises a bandgap reference unit 1, a boost control unit 2, a boost conversion unit 3, a first buck-boost control unit 4, a second buck-boost control unit 5 and a buck-boost conversion unit 6. The bandgap reference unit 1 is electrically connected to the boost control unit 2, and the boost control unit 2 is electrically connected to the boost converter 3. The band gap reference unit 1 is electrically connected with the second buck-boost control unit 5, the first buck-boost control unit 4 is electrically connected with the second buck-boost control unit 5, and the second buck-boost control unit 5 is electrically connected with the buck-boost conversion unit 6.
The bandgap reference unit 1 includes a first input stage transistor 11, a second input stage transistor 12 and a clock chopper amplifier 13, the first input stage transistor 11 and the second input stage transistor 12 are mosfets, control ends of the first input stage transistor 11 and the second input stage transistor 12 are electrically connected, and an output end of the first input stage transistor 11 and an output end of the second input stage transistor 12 are respectively electrically connected to two input ends of the clock chopper amplifier 13.
The boost control unit 2 comprises a first auto-zero amplifier, and the non-inverting terminal of the first auto-zero amplifier is electrically connected with the output terminal of the clock chopper amplifier 13. The boost conversion unit 3 comprises a control circuit module, a first resistor R1 and a second resistor R2, the control circuit module is a logic control circuit or a power MOS device, the first resistor R1 and the second resistor R2 are connected in series, the second resistor R2 is grounded, one end of the first resistor R1 far away from the second resistor R2 is electrically connected with the output end of the control circuit module, and the connection midpoint of the first resistor R1 and the second resistor R2 is electrically connected with the inverting end of the first auto-zero amplifier.
The first buck-boost control unit 4 comprises a clock chopping buffer and a third resistor R3, the in-phase end of the clock chopping buffer is connected with the input of an external DAC, the output end of the clock chopping buffer is connected with the inverting end of the clock chopping buffer and the second buck-boost control unit 5, and the third resistor R3 is electrically connected between the inverting end of the clock chopping buffer and the second buck-boost control unit 5. The second buck-boost control unit 5 comprises a second auto-zero amplifier, a fourth resistor R4 and a fifth resistor R5, the in-phase end of the second auto-zero amplifier is grounded, the inverting end of the second auto-zero amplifier is connected with the output end of the clock chopper amplifier 13 and the output end of the clock chopper buffer, and the output end of the second auto-zero amplifier is electrically connected with the buck-boost conversion unit 6. The buck-boost conversion unit 6 comprises a logic circuit module, a first MOS transistor Q1, a second MOS transistor Q2 and an inductor L1, the logic circuit module is a logic control circuit, an input end of the logic circuit module is electrically connected with an output end of the second auto-zero amplifier, a G pole of the first MOS transistor Q1 and a G pole of the second MOS transistor Q2 are both electrically connected with an output end of the logic circuit module, an S pole of the first MOS transistor Q1 is electrically connected with a voltage input, a D pole of the first MOS transistor Q1 is electrically connected with a S pole of the second MOS transistor Q2, a D pole of the second MOS transistor Q2 is voltage output, one end of the inductor L1 is grounded, and the other end of the inductor L1 is electrically connected with the D pole of the first MOS transistor Q1. The fourth resistor R4 and the fifth resistor R5 are connected in series, the connection midpoint of the fourth resistor R4 and the fifth resistor R5 is electrically connected with the inverting terminal of the second auto-zero-setting amplifier, one end of the fifth resistor R5 far away from the fourth resistor R4 is electrically connected with the D pole of the second MOS transistor Q2, and one end of the fourth resistor R4 far away from the fifth resistor R5 is electrically connected with the output terminal of the clock chopper amplifier 13.
Referring to fig. 4, the method for controlling the accuracy of the output voltage applied to the AMOLED display disclosed by the invention comprises the following steps:
generating a band gap reference voltage through the band gap reference unit 1; the first input stage transistor 11 and the second input stage transistor 12 are matched with each other to generate a reference precision signal, the clock chopper amplifier 13 converts an offset voltage signal generated at its input terminal into a high frequency signal, and then filters the high frequency signal mixed in the reference precision signal to output a band gap reference voltage signal.
The offset voltage signal generated at the input end of the boost control unit 2 is eliminated and a control signal is output; when the signal reaches the boost control unit 2, the first auto-zero amplifier in the boost control unit 2 eliminates the offset voltage signal generated at the input end of the first auto-zero amplifier and outputs a control signal at the output end.
Performing feedback control according to a voltage signal at the output end of the boost conversion unit 3; the boost conversion unit 3 receives the control signal, controls the output voltage according to the control signal, and simultaneously feeds back the output voltage to the boost control unit 2, thereby realizing the feedback control of the boost conversion unit 3.
Acquiring an externally input digital quantity signal, and converting the digital quantity signal into an analog quantity signal; and converting the externally input digital quantity signal into an analog quantity signal through the DAC module.
The offset voltage signal generated at the input end of the first buck-boost control unit 4 is eliminated, and the signal is output to the second buck-boost control unit 5; when the analog quantity signal is input to the first buck-boost control unit 4, the clock chopping buffer in the first buck-boost control unit 4 converts the offset voltage signal generated by the input end of the clock chopping buffer into a high-frequency signal and then filters the high-frequency signal, and then the analog quantity signal with the offset voltage signal eliminated is output to the second buck-boost control unit 5.
The offset voltage signal generated at the input end of the second buck-boost control unit 5 is eliminated, and a control signal is output; when the signal reaches the second buck-boost control unit 5, the second auto-zero amplifier in the second buck-boost control unit 5 eliminates the offset voltage signal generated at the input end of the second auto-zero amplifier and outputs a final control signal.
Performing feedback control according to the voltage signal of the voltage output end; the buck-boost conversion unit 6 receives the control signal and controls the output voltage, and the output voltage signal is fed back to the second buck-boost control unit 5, so that the feedback control of the buck-boost conversion unit 6 is realized.
The implementation principle of the embodiment is as follows: when boosting operation is performed, the first input stage transistor 11 and the second input stage transistor 12 are matched with each other to generate a reference precision signal, the clock chopper amplifier 13 converts an offset voltage signal generated at an input end thereof into a high-frequency signal, and then filters the high-frequency signal mixed in the reference precision signal, so that a bandgap reference voltage signal is output to a non-inverting end of the first auto-zero amplifier, the first auto-zero amplifier eliminates the offset voltage signal generated at the input end thereof and outputs a control signal at an output end, the control circuit module controls an output voltage after receiving the control signal, and the output voltage is fed back to an inverting end of the first auto-zero amplifier to perform feedback control.
When the buck-boost operation is carried out, the DAC module converts an externally input digital quantity signal into an analog quantity signal and transmits the analog quantity signal to the clock chopping buffer, the clock chopping buffer converts an offset voltage signal generated by the input end of the clock chopping buffer into a high-frequency signal and then filters the high-frequency signal, the high-frequency signal is transmitted to the inverting end of the second auto-zero amplifier, the second auto-zero amplifier eliminates the offset voltage signal generated by the input end of the second auto-zero amplifier and outputs a final control signal, the logic circuit module receives the control signal so as to control the first MOS tube Q1 and the second MOS tube Q2, output voltage is controlled and fed back to the inverting end of the second auto-zero amplifier, and feedback control is carried out.
The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (8)
1. The utility model provides an output voltage precision control circuit for AMOLED display which characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
a band-gap reference unit (1) for generating a band-gap reference voltage signal for eliminating the offset voltage signal;
the boost control unit (2) is used for receiving the signal transmitted by the band gap reference unit (1), eliminating an offset voltage signal generated at the input position of the boost control unit and transmitting the signal to the boost conversion unit (3);
the boost conversion unit (3) is used for receiving the signal output by the boost control unit (2), boosting the input voltage according to the signal transmitted by the boost control unit (2), and outputting a first output voltage;
the first buck-boost control unit (4) is used for receiving an externally input control signal, converting an offset voltage signal in the control signal into a high-frequency signal, filtering the high-frequency signal and outputting the control signal;
the second buck-boost control unit (5) is used for receiving the control signal output by the first buck-boost control unit (4) and the band-gap reference voltage signal output by the band-gap reference unit (1), eliminating the offset voltage signal generated at the input position of the second buck-boost control unit and outputting the control signal;
and the voltage-boosting and voltage-reducing conversion unit (6) is used for receiving the input voltage, boosting or reducing the input voltage according to the control signal transmitted by the second voltage-boosting and voltage-reducing control unit (5) and outputting a second output voltage, wherein the polarity of the output voltage is opposite to that of the input voltage.
2. The output voltage precision control circuit applied to an AMOLED display of claim 1, wherein: the band-gap reference unit (1) comprises a first input stage transistor (11), a second input stage transistor (12) and a clock chopper amplifier (13), the output end of the first input stage transistor (11) and the output end of the second input stage transistor (12) are electrically connected with two input ends of the clock chopper amplifier (13) respectively, the control end of the first input stage transistor (11) is electrically connected with the control end of the second input stage transistor (12), and the output end of the clock chopper amplifier (13) is electrically connected with the in-phase end of the boost control unit (2).
3. The output voltage precision control circuit applied to the AMOLED display as set forth in claim 2, wherein: the boost control unit (2) comprises a first automatic zero setting amplifier, the in-phase end of the first automatic zero setting amplifier is electrically connected with the output end of the clock chopper amplifier (13), and the inverting end of the first automatic zero setting amplifier is electrically connected with the output end of the boost conversion unit (3).
4. The output voltage precision control circuit applied to the AMOLED display as set forth in claim 3, wherein: the first buck-boost control unit (4) comprises a clock chopping buffer, the in-phase end of the clock chopping buffer is connected with the external input, and the output end of the clock chopping buffer is connected with the anti-phase end of the clock chopping buffer and the second buck-boost control unit (5).
5. The output voltage precision control circuit applied to the AMOLED display as set forth in claim 4, wherein: the second buck-boost control unit (5) comprises a second automatic zero setting amplifier, the in-phase end of the second automatic zero setting amplifier is grounded, the inverting end of the second automatic zero setting amplifier is connected with the output end of the clock chopping amplifier (13) and the output end of the clock chopping buffer, and the output end of the second automatic zero setting amplifier is electrically connected with the buck-boost conversion unit (6).
6. An output voltage accuracy control method based on the circuit of any one of claims 3 to 5, characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
generating a bandgap reference voltage by a bandgap reference unit (1);
the offset voltage signal generated at the input end of the boost control unit (2) is eliminated and a control signal is output;
performing feedback control according to a voltage signal at the output end of the boost conversion unit (3);
acquiring an externally input digital quantity signal, converting the digital quantity signal into an analog quantity signal and inputting the analog quantity signal to the input end of the first buck-boost control unit (4);
the offset voltage signal generated at the input end of the first buck-boost control unit (4) is eliminated, and the signal is output to the second buck-boost control unit (5);
the offset voltage signal generated at the input end of the second buck-boost control unit (5) is eliminated, and a control signal is output;
and the buck-boost conversion unit (6) boosts or lowers the input voltage according to the control signal.
7. The output voltage accuracy control method according to claim 6, characterized in that: the specific method for generating the bandgap reference voltage through the bandgap reference unit (1) comprises the following steps:
generating a reference precision signal according to an external input;
the offset voltage signal generated at the input end of the band-gap reference unit (1) is converted into a high-frequency signal;
filtering out a high-frequency signal mixed in the reference precision signal;
and outputting a band-gap reference voltage signal.
8. The output voltage accuracy control method according to claim 6, characterized in that: the specific method for eliminating the offset voltage signal generated at the input end of the first buck-boost control unit (4) comprises the following steps:
the offset voltage signal generated by the input end of the first buck-boost control unit (4) is converted into a high-frequency signal;
high frequency signals mixed in the input analog quantity signal are filtered.
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