CN211405861U - High-precision adjustable power supply circuit capable of reducing power supply ripple and power supply equipment - Google Patents
High-precision adjustable power supply circuit capable of reducing power supply ripple and power supply equipment Download PDFInfo
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- CN211405861U CN211405861U CN202021545056.2U CN202021545056U CN211405861U CN 211405861 U CN211405861 U CN 211405861U CN 202021545056 U CN202021545056 U CN 202021545056U CN 211405861 U CN211405861 U CN 211405861U
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Abstract
The application relates to a high-precision adjustable power supply circuit capable of reducing power supply ripples and power supply equipment, wherein the power supply circuit comprises a power supply module, a primary voltage regulating circuit and a secondary voltage regulating circuit, wherein the power supply module is used for outputting voltage Vout 1; the primary voltage regulating circuit is connected with the power supply module and is used for regulating the output voltage Vout1 of the power supply module according to a first reference voltage Vdac 1; the secondary voltage regulating circuit is connected with the power supply module and is used for outputting a voltage Vout2 according to a second reference voltage Vdac2 and an output voltage Vout1 of the power supply module; meanwhile, the two-stage voltage regulating circuit comprises a ripple module which is used for filtering the output voltage Vout1 of the power supply module so as to reduce power supply ripple. The high-precision adjustable power supply circuit capable of reducing the power supply ripple has the advantages that the precision is higher, the power supply ripple can be reduced, and the higher requirements of the liquid crystal module can be met in the two aspects of voltage precision and power supply quality.
Description
Technical Field
The application relates to the technical field of liquid crystal module power supplies, in particular to a high-precision adjustable power supply circuit capable of reducing power supply ripples and power supply equipment.
Background
Along with the requirement of the liquid crystal module on the working voltage is higher and higher, the working voltage provided by the testing equipment can adjust the voltage value within a certain range to adapt to the liquid crystal modules with different sizes, and moreover, the ripple of the output voltage is required to be small enough, so that the water ripple or the flicker can be prevented from occurring when the modules are in point screen, and the picture quality of the screen can be ensured.
In the related art, on one hand, in order to adjust the voltage value within a certain range, a digital power supply using a PWM controller as a voltage adjusting module is used, and the working process of the digital power supply is as follows: the output voltage value is adjusted by changing the duty cycle or frequency of the PWM signal. However, the accuracy of adjusting the voltage value is not high, and the method cannot be more accurately matched with liquid crystal modules with different sizes.
On the other hand, in order to reduce the power supply ripple, an LC filter circuit is usually used, but the filter circuit and the ripple frequency are different, different power supply circuits need different LC parameters, which needs to be determined by frequency or simulation, and the use is complicated, and under the condition of outputting a large current, the dc impedance of the inductor in the LC filter circuit will bring a voltage drop, and the accuracy of the output voltage will also be directly affected.
Disclosure of Invention
The embodiment of the application provides a high-precision adjustable power supply circuit capable of reducing power supply ripples and power supply equipment, so as to solve the technical problems of low precision of output voltage and large power supply ripples in the related art.
In a first aspect, a high-precision adjustable power circuit capable of reducing power supply ripple is provided, which includes:
a power supply module for outputting a voltage Vout 1;
the primary voltage regulating circuit is connected with the power supply module and is used for regulating the output voltage Vout1 of the power supply module according to a first reference voltage Vdac 1;
the secondary voltage regulating circuit is connected with the power supply module and is used for outputting a voltage Vout2 according to a second reference voltage Vdac2 and an output voltage Vout1 of the power supply module; at the same time, the user can select the desired position,
the two-stage voltage regulating circuit comprises a ripple module which is used for filtering the output voltage Vout1 of the power supply module so as to reduce power supply ripple.
In some embodiments, the one-stage voltage regulation circuit comprises:
a voltage following module, configured to output a voltage V _ op1 with stronger driving capability according to a first reference voltage Vdac 1;
the first voltage division module is connected with the power supply module, two input ends of the first voltage division module are respectively connected with the output voltage V _ op1 of the voltage following module and the FB pin of the power supply module, an output end of the first voltage division module is connected with the output voltage Vout1 of the power supply module, and the first voltage division module is used for adjusting the voltage Vout1 of the voltage V _ op1 in a resistance voltage division mode.
In some embodiments, the voltage follower module includes a first operational amplifier OP1, an input terminal of the first operational amplifier OP1 is connected to the first reference voltage Vdac1, an output terminal of the first operational amplifier OP1 is connected to another input terminal, and an output terminal of the first operational amplifier OP1 outputs a voltage V _ OP 1.
In some embodiments, the first voltage division module includes a resistor R1, a resistor R2, and a resistor R3, the resistor R1 is connected between the FB pin of the power module and the output terminal of the voltage follower module, the resistor R2 is connected between the FB pin of the power module and the output terminal of the power module, and the resistor R3 is connected between the FB pin of the power module and ground.
In some embodiments, the one-stage voltage regulation circuit comprises a first digital-to-analog converter DAC1, the first digital-to-analog converter DAC1 being configured to output a first reference voltage Vdac 1.
In some embodiments, the ripple module includes a transistor Q1 and a second operational amplifier OP2, a first terminal of the transistor Q1 is connected to the output terminal of the power module, a second terminal of the transistor Q1 is connected to the output terminal of the second operational amplifier OP2, and a third terminal of the transistor Q1 outputs a voltage Vout 2; one input end of the second operational amplifier OP2 is connected to the second reference voltage Vdac2, and the other input end of the second operational amplifier OP2 is connected to the third end of the transistor Q1.
In some embodiments, the two-stage voltage regulating circuit further includes a second voltage dividing circuit, which includes a plurality of resistors, an input terminal of the second voltage dividing circuit is connected to another input terminal of the second operational amplifier OP2, an output terminal of the second voltage dividing circuit is connected to the third terminal of the transistor Q1, and the second voltage dividing circuit is configured to adjust the voltage Vout2 by dividing a second reference voltage Vdac2 through resistors.
In some embodiments, the second voltage divider circuit includes a resistor R4 and a resistor R5, the resistor R4 and the resistor R5 are connected in series and then connected between the third terminal of the transistor Q1 and ground, and a connection point of the resistor R4 and the resistor R5 is connected to another input terminal of the second operational amplifier OP 2.
In some embodiments, the two-stage voltage regulation circuit comprises a second digital-to-analog converter DAC2, the second digital-to-analog converter DAC2 being configured to output a second reference voltage Vdac 2.
In some embodiments, the transistor Q1 is a PMOS transistor.
In a second aspect, the present application provides a power supply apparatus including the above-described high-precision adjustable power supply circuit that can reduce power supply ripple.
The beneficial effect that technical scheme that this application provided brought includes: not only the precision is higher, but also can reduce the power ripple to can satisfy liquid crystal module's higher demand in voltage precision and power quality two aspects.
The application provides a but high accuracy adjustable power supply circuit of reduction power ripple, can carry out preliminary pressure regulating through one-level voltage regulating circuit, control pressure difference, provide sufficient load current, then pass through second level voltage regulating circuit again, accurate final output voltage that sets up, meanwhile, still carry out filtering process to voltage Vout1 through the ripple module, reduce the power ripple, improve output voltage's power quality, thereby make this adjustable power supply circuit not only the precision higher, but also can reduce the power ripple, with the higher demand that can satisfy liquid crystal module in voltage precision and power quality two aspects.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block diagram of a high-precision adjustable power circuit capable of reducing power supply ripples according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of a high-precision adjustable power supply capable of reducing power supply ripples according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
Referring to fig. 1, the present application provides a high-precision adjustable power circuit capable of reducing power supply ripples, which includes a power module, a primary voltage regulating circuit and a secondary voltage regulating circuit.
The power supply module is used for outputting voltage Vout 1; the primary voltage regulating circuit is connected with the power supply module and is used for regulating the output voltage Vout1 of the power supply module according to a first reference voltage Vdac 1; the secondary voltage regulating circuit is connected with the power supply module and is used for outputting a voltage Vout2 according to a second reference voltage Vdac2 and an output voltage Vout1 of the power supply module; meanwhile, the two-stage voltage regulating circuit comprises a ripple module which is used for filtering the output voltage Vout1 of the power supply module so as to reduce power supply ripple.
The high accuracy adjustable power supply circuit of this application embodiment can reduce power ripple, on the one hand, can carry out preliminary pressure regulating through one-level voltage regulating circuit, control pressure difference, provide sufficient load current, then pass through second level voltage regulating circuit again, accurate final output voltage that sets up, meanwhile, still carry out filtering process to voltage Vout1 through the ripple module, reduce power ripple, improve output voltage's power quality, thereby make this adjustable power supply module not only the precision higher, but also can reduce power ripple, with the higher demand that can satisfy liquid crystal module in voltage precision and power quality two aspects.
On the other hand, because this power supply circuit includes one-level regulator circuit and second grade regulator circuit, configuration voltage that can be nimble to reduce the consumption of circuit, thereby reduce the cost of circuit, moreover, this power supply circuit realizes that the process is simple, and components and parts are with low costs, and the practicality is stronger.
In the embodiment of the present application, the power module is a DCDC power module, which has an FB pin, which is a voltage feedback pin of the power module, and the power module provides a first stage output voltage Vout 1. The DCDC power module in the embodiment of the application can be a standard BUCK-type BUCK-DCDC circuit, and in practical application, the DCDC power module is selected according to actual requirements, and is not limited herein.
Furthermore, in the embodiment of the present application, the one-stage voltage regulation circuit includes a first digital-to-analog converter DAC1, a voltage following module, and a first voltage division module.
The first digital-to-analog converter DAC1 is configured to output a first reference voltage Vdac 1. The voltage following module is used for outputting a voltage V _ op1 with stronger driving capability according to a first reference voltage Vdac 1; the first voltage division module comprises a plurality of resistors, the resistors are connected with the power supply module, two input ends of the first voltage division module are respectively connected with the output voltage V _ op1 of the voltage following module and the FB pin of the power supply module, an output end of the first voltage division module is connected with the output voltage Vout1 of the power supply module, and the first voltage division module is used for regulating the voltage Vout1 by means of resistor voltage division of the voltage V _ op 1.
Referring to fig. 2, in the embodiment of the present application, the voltage follower module includes a first operational amplifier OP1, one input terminal of the first operational amplifier OP1 is connected to the first reference voltage Vdac1, an output terminal of the first operational amplifier OP1 is connected to another input terminal, and an output terminal of the first operational amplifier OP1 outputs a voltage V _ OP 1.
Specifically, in practical applications, a forward input terminal of the first operational amplifier OP1 is connected to the first reference voltage Vdac1, and an output terminal of the first operational amplifier OP1 is connected to an inverting input terminal.
The first operational amplifier OP1 according to the embodiment of the application is used for converting the first reference voltage Vdac1 output by the first digital-to-analog converter DAC1 into a voltage V _ OP1 with stronger driving capability, completing voltage conversion, and providing a voltage regulating current for the first voltage dividing module connected in the rear, so as to regulate the voltage Vout 1.
Still further, in the embodiment of the present application, the first voltage division module includes a resistor R1, a resistor R2, and a resistor R3, the resistor R1 is connected between the FB pin of the power module and the output terminal of the voltage follower module, the resistor R2 is connected between the FB pin of the power module and the output terminal of the power module, and the resistor R3 is connected between the FB pin of the power module and the ground.
The resistor R1, the resistor R2 and the resistor R3 of the embodiment of the application are all high-precision resistors, which form a first voltage dividing circuit, and the output voltage Vout1 of the power supply module is adjusted by utilizing the characteristics of voltage constancy and current balance at the FB pin of the power supply module.
The working principle of the first-stage voltage regulating circuit of the embodiment of the application is as follows:
after the DCDC power module is started, a constant voltage Vout1 is output, then software configures a DAC1 through an I2C bus or an SPI bus, a set first reference voltage Vdac1 is output, the first reference voltage Vdac1 is converted into a voltage V _ OP1 with stronger driving capability through the following driving of a first operational amplifier OP1, then the output voltage Vout1 is adjusted according to a certain linear relation through the current balance processing of resistors R1, R2 and R3 and the constant voltage characteristic of an FB pin of the DCDC power module.
In the implementation process of the primary voltage regulating circuit, the calculation formula of each voltage parameter is as follows:
Vdac1=V_op1
(V_op1–Vfb)/R1 + (Vout1–Vfb)/R2 = Vfb/R3
in the formula, Vdac1 is a first reference voltage value, V _ OP1 is an output voltage value of the first operational amplifier OP1, Vfb is an output voltage value of the FB pin of the DCDC power module, R1 is a resistance value of the resistor R1, R2 is a resistance value of the resistor R2, R3 is a resistance value of the resistor R3, and Vout1 is an output voltage value of the power module.
The calculation formula of the output voltage Vout1 can be derived from the above:
Vout1 = [Vfb*(R1*R2+R1*R3+R2*R3)–Vdac1*R2*R3]/ (R1*R3)
can be simplified as follows:
Vout1 = a*Vdac1 + b
wherein a = -R2/R1, b = Vfb (R1 × R2+ R1 × R3+ R2 × R3)/(R1 × R3).
Because the resistance values of the resistor R1, the resistor R2 and the resistor R3 are known values, and the Vfb is an output voltage value of an FB pin of the DCDC power module and is also a known voltage value, the linear relation between the output voltage Vout1 of the power module and the first reference voltage Vdac1 is obtained through derivation, the DAC1 can be configured through software, the output voltage Vout1 can be flexibly adjusted, and the purpose of primary voltage regulation is achieved.
Further, in the embodiment of the present application, the ripple module includes a transistor Q1 and a second operational amplifier OP2, a first terminal of the transistor Q1 is connected to the output terminal of the power module, a second terminal of the transistor Q1 is connected to the output terminal of the second operational amplifier OP2, and a third terminal of the transistor Q1 outputs a voltage Vout 2; one input end of the second operational amplifier OP2 is connected to the second reference voltage Vdac2, and the other input end of the second operational amplifier OP2 is connected to the third end of the transistor Q1.
Specifically, in the embodiment of the present application, the other input terminal of the second operational amplifier OP2 is connected to the third terminal of the transistor Q1 through the resistor R4.
Preferably, in this embodiment, the transistor Q1 is a PMOS transistor and functions as a voltage switch, and in this embodiment, the transistor Q1 operates in the variable resistance region to control the voltage level of the output voltage Vout2, so that the circuit structure is simpler and the performance is better by using the PMOS transistor.
When the transistor Q1 is a PMOS transistor, the source S of the transistor Q1 is connected to the output terminal of the power module, the gate G of the transistor Q1 is connected to the output terminal of the second operational amplifier OP2, and the drain D of the transistor Q1 outputs the voltage Vout 2.
The operating principle of the ripple module of the embodiment of the application is as follows:
the transistor Q1 and the second operational amplifier OP2 form a negative feedback circuit, when the negative feedback circuit works stably, the negative feedback balance characteristic of the second operational amplifier OP2 is utilized, the second operational amplifier OP2 outputs a self-adaptive adjustable voltage value V _ OP2 when the circuit is stable, the working state of the transistor Q1 is controlled through the voltage value V _ OP2, the transistor Q1 works in a variable resistance area, also called a non-saturation area, and when the voltage difference U between the grid and the source of the transistor Q1 is generatedGSConstant drain current IDThe region is approximately a straight line in linear relation to the gate and drain voltages of the transistor Q1, and a voltage U is applied between the drain and the gate of the transistor Q1GSThe variable resistor is controlled, so that the voltage Vout1 is filtered, and the power supply ripple is reduced.
Furthermore, in this embodiment, the two-stage voltage regulating circuit further includes a second voltage dividing circuit, which includes a plurality of resistors, an input terminal of the second voltage dividing circuit is connected to another input terminal of the second operational amplifier OP2, an output terminal of the second voltage dividing circuit is connected to the third terminal of the transistor Q1, and the second voltage dividing circuit is configured to adjust the voltage Vout2 by dividing the second reference voltage Vdac2 through resistors.
Specifically, in the embodiment of the present application, the second voltage dividing circuit includes a resistor R4 and a resistor R5, the resistor R4 and the resistor R5 are connected in series and then connected between the third terminal of the transistor Q1 and the ground, and a connection point of the resistor R4 and the resistor R5 is connected to another input terminal of the second operational amplifier OP 2.
The resistor R4 and the resistor R5 in the embodiment of the present application are high-precision resistors, which form a second voltage dividing circuit, divide the output voltage Vout2, and form a negative feedback loop with the second operational amplifier OP2 and the transistor Q1 to adjust the final output voltage Vout 2.
Further, in the embodiment of the present application, the two-stage voltage regulating circuit includes a second digital-to-analog converter DAC2, and the second digital-to-analog converter DAC2 is configured to output a second reference voltage Vdac 2.
The working principle of the secondary voltage regulating circuit of the embodiment of the application is as follows:
in the secondary voltage regulating circuit, a DAC2 is configured through software, a set second reference voltage Vdac2 is output, voltage division is carried out through a resistor R4 and a resistor R5, and the output voltage Vout2 can be accurately configured;
meanwhile, the transistor Q1, the second operational amplifier OP2, the resistor R4 and the resistor R5 form a negative feedback loop, and the output voltage Vout1 of the power module is filtered to reduce power supply ripple.
In the implementation process of the secondary voltage regulating circuit, the calculation formula of each voltage parameter is as follows:
Vdac2 = Vout2 * R5/(R4+R5)
in the formula, Vdac2 is a second reference voltage value, Vout2 is a circuit output voltage value, R4 is a resistance value of the resistor R4, and R5 is a resistance value of the resistor R5.
The calculation formula for the output voltage Vout2 derived from the above is:
Vout2 = Vdac2 * (R4+R5)/R5
since the resistances of the resistor R4 and the resistor R5 are known, it is derived that the output voltage Vout2 and the second reference voltage Vdac2 have a linear relationship, and according to the linear relationship, the output voltage Vout2 can be accurately configured by software.
Meanwhile, in the two-stage voltage regulating circuit, the ripple of the output voltage Vout2 is greatly reduced by using the filtering characteristic of a negative feedback circuit consisting of the transistor Q1 and the second operational amplifier OP2, so that the power supply quality is improved.
In the high-precision adjustable power circuit capable of reducing the power supply ripple, the two-stage output voltages Vout1 and Vout2 are respectively controlled and adjusted by setting the output voltage values of the DAC1 and the DAC2, the Vout1 is larger than the Vout2, and a certain voltage difference is always kept, wherein the voltage difference is generally between 0.2V and 1V, adjustment needs to be set according to actual circuit parameters and specification requirements, and the voltage difference is reasonably set according to actual application conditions, so that a negative feedback loop of a later stage can stably work, the ripple can be inhibited to the maximum effect, heat consumption on a transistor Q1 can be controlled, and power consumption in the circuit is reduced.
The embodiment of the application also provides power supply equipment which comprises the high-precision adjustable power supply circuit capable of reducing the power supply ripple.
The power supply equipment provided by the embodiment of the application is an application of the high-precision adjustable power supply circuit capable of reducing the power supply ripple, can be adaptively adjusted according to an actual application scene, and can realize all functional effects of the high-precision adjustable power supply circuit capable of reducing the power supply ripple.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A high-precision adjustable power supply circuit capable of reducing power supply ripples is characterized by comprising:
a power supply module for outputting a voltage Vout 1;
the primary voltage regulating circuit is connected with the power supply module and is used for regulating the output voltage Vout1 of the power supply module according to a first reference voltage Vdac 1;
the secondary voltage regulating circuit is connected with the power supply module and is used for outputting a voltage Vout2 according to a second reference voltage Vdac2 and an output voltage Vout1 of the power supply module; at the same time, the user can select the desired position,
the two-stage voltage regulating circuit comprises a ripple module which is used for filtering the output voltage Vout1 of the power supply module so as to reduce power supply ripple.
2. A high precision adjustable power circuit capable of reducing power supply ripples according to claim 1, wherein the one-stage voltage regulating circuit comprises:
a voltage following module, configured to output a voltage V _ op1 with stronger driving capability according to a first reference voltage Vdac 1;
the first voltage division module is connected with the power supply module, two input ends of the first voltage division module are respectively connected with the output voltage V _ op1 of the voltage following module and the FB pin of the power supply module, an output end of the first voltage division module is connected with the output voltage Vout1 of the power supply module, and the first voltage division module is used for adjusting the voltage Vout1 of the voltage V _ op1 in a resistance voltage division mode.
3. A highly accurate adjustable power supply circuit capable of reducing power supply ripple according to claim 2, wherein:
the voltage following module comprises a first operational amplifier OP1, wherein one input end of the first operational amplifier OP1 is connected with the first reference voltage Vdac1, the output end of the first operational amplifier OP1 is connected with the other input end, and the output end of the first operational amplifier OP1 outputs a voltage V _ OP 1.
4. A highly accurate adjustable power supply circuit capable of reducing power supply ripple according to claim 2, wherein:
the first voltage division module comprises a resistor R1, a resistor R2 and a resistor R3, wherein the resistor R1 is connected between the FB pin of the power supply module and the output end of the voltage following module, the resistor R2 is connected between the FB pin of the power supply module and the output end of the power supply module, and the resistor R3 is connected between the FB pin of the power supply module and the ground.
5. A highly accurate adjustable power supply circuit capable of reducing power supply ripple according to claim 1, wherein:
the one-stage voltage regulating circuit comprises a first digital-to-analog converter DAC1, and the first digital-to-analog converter DAC1 is used for outputting a first reference voltage Vdac 1.
6. A highly accurate adjustable power supply circuit capable of reducing power supply ripple according to claim 1, wherein:
the ripple module comprises a transistor Q1 and a second operational amplifier OP2, a first end of the transistor Q1 is connected with the output end of the power supply module, a second end of the transistor Q1 is connected with the output end of the second operational amplifier OP2, and a third end of the transistor Q1 outputs a voltage Vout 2; one input end of the second operational amplifier OP2 is connected to the second reference voltage Vdac2, and the other input end of the second operational amplifier OP2 is connected to the third end of the transistor Q1.
7. The adjustable power supply circuit with high precision and capable of reducing power supply ripples according to claim 6, wherein:
the two-stage voltage regulating circuit further comprises a second voltage dividing circuit, the second voltage dividing circuit comprises a plurality of resistors, the input end of the second voltage dividing circuit is connected with the other input end of the second operational amplifier OP2, the output end of the second voltage dividing circuit is connected with the third end of the transistor Q1, and the second voltage dividing circuit is used for adjusting the voltage Vout2 of a second reference voltage Vdac2 in a resistor voltage dividing mode.
8. A highly accurate adjustable power supply circuit capable of reducing power supply ripple according to claim 7, wherein:
the second voltage division circuit comprises a resistor R4 and a resistor R5, the resistor R4 and the resistor R5 are connected in series and then connected between the third end of the transistor Q1 and the ground, and the connection point of the resistor R4 and the resistor R5 is connected with the other input end of the second operational amplifier OP 2.
9. A highly accurate adjustable power supply circuit capable of reducing power supply ripple according to claim 1, wherein:
the two-stage voltage regulating circuit comprises a second digital-to-analog converter DAC2, and the second digital-to-analog converter DAC2 is used for outputting a second reference voltage Vdac 2.
10. A power supply apparatus comprising the high-precision adjustable power supply circuit according to any one of claims 1 to 9, which can reduce power supply ripple.
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| CN202021545056.2U CN211405861U (en) | 2020-07-30 | 2020-07-30 | High-precision adjustable power supply circuit capable of reducing power supply ripple and power supply equipment |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786557A (en) * | 2020-09-07 | 2020-10-16 | 武汉精测电子集团股份有限公司 | Power circuit and signal generator capable of automatically reducing power consumption of LDO (low dropout regulator) |
| CN112953214A (en) * | 2021-04-02 | 2021-06-11 | 海的电子科技(苏州)有限公司 | High-precision high-efficiency low-ripple adjustable constant-voltage circuit |
| CN114371754A (en) * | 2021-11-30 | 2022-04-19 | 南京中感微电子有限公司 | High-precision voltage regulator |
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2020
- 2020-07-30 CN CN202021545056.2U patent/CN211405861U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111786557A (en) * | 2020-09-07 | 2020-10-16 | 武汉精测电子集团股份有限公司 | Power circuit and signal generator capable of automatically reducing power consumption of LDO (low dropout regulator) |
| CN112953214A (en) * | 2021-04-02 | 2021-06-11 | 海的电子科技(苏州)有限公司 | High-precision high-efficiency low-ripple adjustable constant-voltage circuit |
| CN114371754A (en) * | 2021-11-30 | 2022-04-19 | 南京中感微电子有限公司 | High-precision voltage regulator |
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