CN114326893A - PID control system of adjustable voltage source, adjustable voltage source and image signal generator - Google Patents
PID control system of adjustable voltage source, adjustable voltage source and image signal generator Download PDFInfo
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Abstract
The embodiment of the invention provides a PID control system of an adjustable voltage source, the adjustable voltage source and an image signal generator. The adjustable voltage source comprises at least one power supply generating circuit, each power supply generating circuit is used for providing power supply voltage for a load, wherein the PID control system comprises: the programmable gate array module comprises gate array sub-modules which correspond to the power generation circuits one by one; the input end of the gate array submodule is connected with the voltage feedback end of the corresponding power generation circuit, the output end of the gate array submodule is connected with the control end of the corresponding power generation circuit, and the gate array submodule is used for adjusting the output voltage of the power generation circuit based on the voltage fed back by the voltage feedback end, wherein the voltage feedback end is a preset inner feedback end or a preset outer feedback end. The PID control system can effectively ensure the stability of each path of power supply voltage provided by the image signal generator. In addition, the power supply of the whole adjustable voltage source is high in adjusting speed and high in efficiency.
Description
Technical Field
The invention relates to the technical field of display panel detection, in particular to a PID control system of an adjustable voltage source, the adjustable voltage source and an image signal generator.
Background
A Pattern Generator (PG) is a signal generating device that can generate different image test signals in response to different commands to realize the test of Display panels such as Liquid Crystal Displays (LCDs) and Organic Light-Emitting diodes (OLEDs).
The image signal generator can generate a plurality of power signals for providing different power signals for the display panel to be tested (i.e. the screen to be tested) to perform the test. The multiple power signals may be generated using multiple power generation circuits and provided to a load (i.e., a screen under test). In the test process of the screen to be tested, in order to ensure the test effect, the stability of the power supply voltage provided by the power supply generating circuit needs to be ensured.
Therefore, it is desirable to provide a technique capable of effectively ensuring the stability of each power supply voltage provided by the image signal generator.
Disclosure of Invention
The present invention has been made in view of the above problems. The invention provides a PID control system of an adjustable voltage source, the adjustable voltage source and an image signal generator.
According to an aspect of the present invention, there is provided a PID control system of an adjustable voltage source, the adjustable voltage source comprising at least one power generating circuit, each power generating circuit for providing a power voltage to a load, wherein the PID control system comprises: the programmable gate array module comprises gate array sub-modules which correspond to the power generation circuits one by one; the input end of the gate array submodule is connected with the voltage feedback end of the corresponding power generation circuit, the output end of the gate array submodule is connected with the control end of the corresponding power generation circuit, and the gate array submodule is used for adjusting the output voltage of the power generation circuit based on the voltage fed back by the voltage feedback end, wherein the voltage feedback end is a preset inner feedback end or a preset outer feedback end.
Illustratively, the PID control system further comprises: the feedback voltage selection module is in one-to-one correspondence with the at least one power generation circuit, the input end of the feedback voltage selection module is respectively connected with the corresponding preset inner feedback end and the preset outer feedback end, the output end of the feedback voltage selection module is connected with the input end of the programmable gate array module, and the control end of the feedback voltage selection module is used for being connected with the output end of the controller; the feedback voltage selection module is used for controlling the voltage feedback end to switch between a preset inner feedback end and a preset outer feedback end under the control of the first control signal.
Illustratively, the feedback voltage selection module comprises a switch submodule and a switch control submodule, wherein the input end of the switch submodule is respectively connected with a preset inner feedback end and a preset outer feedback end, and the output end of the switch submodule is connected with the input end of the gate array submodule; the input end of the switch control submodule is used as the control end of the feedback voltage selection module, the output end of the switch control submodule is connected with the control end of the switch submodule, and the switch control submodule is used for controlling the input end of the switch submodule to be switched between a preset inner feedback end and a preset outer feedback end under the control of a first control signal.
Illustratively, the switch submodule is a relay, and the switch control submodule is a relay driving circuit, wherein an input end of the relay driving circuit is used for receiving a first control signal, an output end of the relay driving circuit is connected with a coil input end of the relay, and the relay driving circuit is used for generating a driving signal for driving a contact of the relay to be switched on or switched off under the control of the first control signal; a first common contact of the relay is connected with a first input end of the door array submodule, and a first normally open contact and a first normally closed contact of the relay are grounded; a second common contact of the relay is connected with a second input end of the door array submodule, a second normally open contact of the relay is connected with the first feedback end, and a second normally closed contact of the relay is connected with the second feedback end, wherein the first feedback end and the second feedback end are different and are respectively one of a preset inner feedback end and a preset outer feedback end; the first input end and the second input end form a pair of differential input ends.
Illustratively, the relay driving circuit comprises a triode and a diode, wherein a coil of the relay is connected with the diode in parallel, a first end formed by the parallel connection is connected with a preset power supply voltage, and a second end formed by the parallel connection is connected with a collector electrode of the triode; the base electrode of the triode is used for receiving the first control signal, and the emitting electrode of the triode is grounded.
The programmable gate array module further comprises an analog-to-digital conversion module and a digital-to-analog conversion module which are in one-to-one correspondence with the at least one power generation circuit, wherein an input end of the analog-to-digital conversion module is connected with the voltage feedback end, an output end of the analog-to-digital conversion module is connected with an input end of the corresponding gate array submodule, and the analog-to-digital conversion module is used for performing analog-to-digital conversion on an analog voltage signal sampled from the voltage feedback end to obtain a digital voltage signal; the gate array submodule is used for calculating and generating a digital control signal according to the digital voltage signal and the ideal digital voltage signal; the input end of the digital-to-analog conversion module is connected with the output end of the corresponding gate array submodule, the output end of the digital-to-analog conversion module is connected with the control end of the power generation circuit, and the digital-to-analog conversion module is used for converting a digital control signal into an analog control signal and outputting the analog control signal to the control end of the power generation circuit so as to adjust the output voltage of the power generation circuit.
Illustratively, the gate array submodule is used for calculating and generating a digital control signal according to the digital voltage signal, the ideal digital voltage signal and a preset formula; and the coefficient in the preset formula is related to the conversion coefficient calibrated by the analog-to-digital conversion module and the conversion coefficient calibrated by the digital-to-analog conversion module.
Illustratively, the power supply generation circuit comprises a switching power supply submodule and a linear power supply submodule, wherein an input end of the switching power supply submodule is used as an input end of the power supply generation circuit, and the switching power supply submodule is used for converting the received initial power supply voltage into a first voltage under the control of the second control signal; the input end of the linear power supply submodule is connected with the output end of the switching power supply submodule, the output end of the linear power supply submodule is used as a preset internal feedback end, and the linear power supply submodule is used for regulating the first voltage into the second voltage under the control of the third control signal.
Illustratively, the control terminal of the power generation circuit is the control terminal of the linear power submodule.
According to another aspect of the present invention, there is provided an adjustable voltage source comprising at least one power generating circuit and the PID control system described above.
According to another aspect of the invention, there is provided an image signal generator comprising the adjustable voltage source described above.
The image signal generator may further comprise a controller for sending a first control signal to any of the at least one power generation circuit through a transmission block in the gate array sub-module of the adjustable voltage source; and/or the transmission block in the gate array submodule of the adjustable voltage source is also used for transmitting the voltage signal fed back by the voltage feedback end to the controller.
The controller is further used for transmitting the voltage signal fed back by the voltage feedback end to an upper computer for displaying.
Illustratively, when the PID control system adopts a PID control system including a feedback voltage selection module, the controller is further configured to receive a user selection instruction from the upper computer, generate a corresponding first control signal based on the user selection instruction, and transmit the first control signal to the feedback voltage selection module through a transmission block in the gate array submodule, where the user selection instruction is used to indicate that the voltage feedback terminal is one of a preset inner feedback terminal and a preset outer feedback terminal.
According to the PID control system of the adjustable voltage source, the adjustable voltage source and the image signal generator, the stability of each path of power supply voltage provided by the image signal generator can be effectively ensured. In addition, the PID control system can independently and synchronously perform PID regulation on at least one (for example, 9) power supply generating circuits of the image signal generator by means of the programmable gate array module, so that the power supply regulation speed of the whole adjustable voltage source is high, and the efficiency is high.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent by describing in more detail embodiments of the present invention with reference to the attached drawings. The accompanying drawings are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings, like reference numbers generally represent like parts or steps.
FIG. 1 shows a schematic block diagram of a PID control system, a power generation circuit and a load for an adjustable voltage source according to one embodiment of the invention;
FIG. 2 illustrates a schematic block diagram of a more specific embodiment of a PID control system for an adjustable voltage source and a power generation circuit, according to an embodiment of the invention;
FIG. 3 shows a schematic diagram of a feedback voltage selection module according to one embodiment of the invention; and
fig. 4 shows a schematic diagram of a relay driver circuit and a relay in a feedback voltage selection module according to one embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, exemplary embodiments according to the present invention will be described in detail below with reference to the accompanying drawings. It is to be understood that the described embodiments are merely a subset of embodiments of the invention and not all embodiments of the invention, with the understanding that the invention is not limited to the example embodiments described herein. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the invention described herein without inventive step, shall fall within the scope of protection of the invention.
In order to at least partially solve the above problems, embodiments of the present invention provide a PID control system of an adjustable voltage source, an adjustable voltage source and an image signal generator.
A PID control system for an adjustable voltage source according to an embodiment of the invention is described below in connection with fig. 1-2. Fig. 1 shows a schematic block diagram of a PID control system 100 of an adjustable voltage source, a power generation circuit 200 and a load 300 according to an embodiment of the invention. Fig. 2 shows a schematic block diagram of a more specific embodiment of the adjustable voltage source PID control system 100 and the power generation circuit 200 according to an embodiment of the invention. It should be noted that the structures of the PID control system 100 and the power generation circuit 200 shown in fig. 2 are only examples and are not limiting to the present invention, and the PID control system 100 and the power generation circuit 200 provided in the embodiment of the present invention are not limited to the specific examples shown in fig. 1.
As shown in fig. 1-2, the adjustable voltage source comprises at least one power generating circuit 200, each power generating circuit 200 for providing a supply voltage to a load 300. Different power generation circuits 200 may provide different power voltages to the same load 300, or may provide the same or different power voltages to different loads 300.
As shown in fig. 1-2, the PID control system 100 may include: the programmable gate array module 120, the programmable gate array module 120 may include gate array sub-modules 122 corresponding to the power generation circuits 200 one to one; the input end of the gate array sub-module 122 is connected to the voltage feedback end of the corresponding power generation circuit 200, and the output end of the gate array sub-module 122 is connected to the control end of the corresponding power generation circuit 200, for adjusting the output voltage of the power generation circuit 200 based on the voltage fed back by the voltage feedback end, wherein the voltage feedback end is a preset inner feedback end or a preset outer feedback end. The preset inner feedback terminal and the preset outer feedback terminal are relative concepts. The default inner feedback terminal may be a node near the output terminal (node U4) of the power generation circuit 200, and the default outer feedback terminal may be a node Vext near the input terminal of the load 300.
Fig. 1-2 each show only one power generation circuit and its corresponding gate array sub-module 122, but this is merely an example and not a limitation of the present invention, and the number of power generation circuits may be larger.
The PID control system 100 can include a programmable gate array module 120. By way of example and not limitation, the programmable gate array module 120 may be a Field Programmable Gate Array (FPGA) module or the like. The programmable gate array module 120 may include at least one gate array sub-module 122 in one-to-one correspondence with the at least one power generation circuit 200. In practical applications, the programmable gate array module 120 may employ one programmable gate array chip, and the at least one power generation circuit 200 may share one programmable gate array chip.
A transmission line exists between the power generation circuit 200 and the load 300 (in fig. 1, the transmission line between the nodes U4 and Vext is a dotted line, which indicates that other modules or devices may exist therebetween), and there is a certain loss during the transmission of the power voltage signal to the load by the power generation circuit 200. Therefore, the voltage output by the power generation circuit 200 may not coincide with the voltage actually input to the load 300. In PID tuning for the power generation circuit 200, either the inner feedback (node U4) or the outer feedback (e.g., node Vext) may be selected. That is to say, interior feedback and outer feedback have different voltage sampling precision, and then have different voltage regulation precision, and the user can select suitable feedback mode as required.
The output end of the gate array submodule 122 is connected with the control end of the corresponding power generation circuit 200. The gate array sub-module 122 may perform PID adjustment on the output voltage of the power generation circuit 200 based on the voltage fed back by the voltage feedback terminal.
The PID control system is a Proportional, integral, and differential (Proportional, integral, differential) control loop, which is abbreviated as a PID control loop. The inherent defect of the power supply is that when the load current becomes large, the output voltage begins to drop, namely, the power supply has the problem of load regulation rate. This problem is solved very well by using a PID control loop in the power supply, which maintains the output voltage at a set voltage value, regardless of the load current.
The embodiment of the invention is realized by using a programmable hardware programmable gate array module. The programmable gate array module can sample at a voltage output place, can automatically complete PID calculation and regulation without communicating with a complex control system (such as a singlechip), and can quickly control output voltage in real time. In addition, a programmable gate array is a piece of programmable hardware that is not single threaded like a processing unit (CPU), and can execute code in parallel after solidifying logic circuits. Therefore, the embodiment of the invention can independently and simultaneously carry out PID adjustment on the output voltages of different power generation circuits through the programmable gate array module, thereby adjusting the speed block.
In summary, according to the PID control system of the embodiment of the present invention, the stability of each power voltage provided by the image signal generator can be effectively ensured. In addition, the PID control system can independently and synchronously perform PID regulation on a plurality of (for example, 9) power generation circuits of the image signal generator by the aid of the programmable gate array module, so that the power regulation speed of the whole adjustable voltage source is high, and the efficiency is high.
According to an embodiment of the present invention, the PID control system 100 may further include: the feedback voltage selection modules are in one-to-one correspondence with the at least one power generation circuit 200, the input ends of the feedback voltage selection modules are respectively connected with the corresponding preset inner feedback ends and the preset outer feedback ends, the output ends of the feedback voltage selection modules are connected with the input ends of the programmable gate array modules, and the control ends of the feedback voltage selection modules are used for being connected with the output ends of the controller; the feedback voltage selection module is used for controlling the voltage feedback end to switch between a preset inner feedback end and a preset outer feedback end under the control of the first control signal.
The controller may be any suitable controller having data processing capabilities and/or instruction execution capabilities. For example, the controller may be implemented using one or a combination of microprocessors, Central Processing Units (CPUs), Application Specific Integrated Circuits (ASICs), and other forms of processing units. In one example, the controller may be an embedded control system.
For example, the control terminal of the feedback voltage selection module may be connected to the output terminal of the controller via a gate array sub-module corresponding to the current power generation circuit 200 in the programmable gate array module 120. The first control signal may be transmitted by the controller to the feedback voltage selection module through a transmission block in a gate array submodule in the programmable gate array module 120. At this time, the programmable gate array module 120 may be understood as a transmission line.
For example, and not by way of limitation, the feedback voltage selection module may be implemented using a relay or the like. The feedback voltage selection module is used for selecting the position of a voltage sampling feedback point according to the requirement of a user on precision, and the position can be a preset inner feedback end (U4) or a preset outer feedback end (Vext). When the requirement on the sampling precision is not high, the voltage of the node U4 (namely the power supply output end and the internal feedback point) can be sampled; when the requirement on the sampling precision is high, the voltage of the Vext node (namely the load end, which is also an external feedback point) can be sampled.
For example, the user may select the internal feedback or the external feedback on the upper computer, the upper computer sends a request to the controller according to the selection operation, the controller generates a first control signal (drvrlrelay-fb) according to the request, and the control signal is output to the feedback voltage selection module after passing through the programmable gate array module 120. The feedback voltage selection module can control whether the voltage sampling feedback point is at the Vext node or the U4 node according to the first control signal (drvrlrelay-fb), and feed back the sampled voltage to the analog-to-digital conversion (ADC) module, and the subsequent process is referred to the PID adjustment process.
Through the feedback voltage selection module, a user can independently select internal feedback or external feedback according to needs, so that the requirements of the user on different sampling precision can be met, and the applicability of the image signal generator is better.
According to the embodiment of the invention, the feedback voltage selection module can comprise a switch submodule and a switch control submodule, wherein the input end of the switch submodule is respectively connected with a preset inner feedback end and a preset outer feedback end, and the output end of the switch submodule is connected with the input end of the gate array submodule; the input end of the switch control submodule is used as the control end of the feedback voltage selection module, the output end of the switch control submodule is connected with the control end of the switch submodule, and the switch control submodule is used for controlling the input end of the switch submodule to be switched between a preset inner feedback end and a preset outer feedback end under the control of a first control signal.
The switch submodule is a relatively simple module which can enable the input end to be switched between a preset inner feedback end and a preset outer feedback end, and can control the voltage feedback end to be switched between the preset inner feedback end and the preset outer feedback end by controlling the connection relation of the input end of the switch submodule. The feedback voltage selection module has a simple structure and low hardware cost. The switch control sub-module may be any suitable module capable of controlling the switch sub-module.
According to the embodiment of the invention, the switch submodule is a relay, and the switch control submodule is a relay driving circuit, wherein the input end of the relay driving circuit is used for receiving a first control signal, the output end of the relay driving circuit is connected with the coil input end of the relay, and the relay driving circuit is used for generating a driving signal for driving the contact of the relay to be switched on or switched off under the control of the first control signal; a first common contact of the relay is connected with a first input end of the door array submodule, and a first normally open contact and a first normally closed contact of the relay are grounded; a second common contact of the relay is connected with a second input end of the door array submodule, a second normally open contact of the relay is connected with the first feedback end, and a second normally closed contact of the relay is connected with the second feedback end, wherein the first feedback end and the second feedback end are different and are respectively one of a preset inner feedback end and a preset outer feedback end; the first input end and the second input end form a pair of differential input ends.
FIG. 3 shows a schematic diagram of a feedback voltage selection module according to one embodiment of the invention. As shown in fig. 3, the feedback voltage selection module may include a relay driver circuit and a relay (i.e., relay 1). The relay 2 shown in fig. 3 is used to control the on/off of the transmission line between the power generating circuit 200 and the load 300, and is not related to the PID control described herein, and is not described herein again. Through the relay 1, the voltage fed back by the node U4 or the node Vext can be controlled to be input into the ADC for analog-to-digital conversion and further input into the programmable gate array module 120 for PID adjustment. Fig. 3 also shows that the feedback voltage is passed through an attenuator and amplifier (Amp) before being input to the ADC, but these additional devices are merely examples and not limitations of the present invention, and the present invention may not employ these devices or further employ other devices. In addition, the current sampling module shown in fig. 3 is also an example, which may not be present. Further, the power generation circuit 200 shown in fig. 3 includes a Low Dropout (LDO) linear regulator module, a digital-to-analog conversion and amplification (DAC & AMP) module, and the like, which are also examples, and the power generation circuit 200 may not include these devices and may include other devices than those shown in fig. 3.
Fig. 4 shows a schematic diagram of a relay driver circuit and a relay in a feedback voltage selection module according to one embodiment of the invention. As shown in fig. 4, the relay driver circuit may include a transistor Q23 and a diode D17. The relay in fig. 4 is denoted by RL 13.
When the first control signal drvrelay-FB is low, the transistor Q23 is not turned on, the contacts 2 and 3 of the relay RL13 are connected, the contacts 6 and 7 are connected, the voltage of the node U4 is output to the second input terminal FB +, and the ground signal is output to the first input terminal FB-. At this time, the sampling point of the feedback voltage is U4, which is the internal feedback.
When the first control signal drvrelay-FB is at a high level, the transistor Q23 is turned on, the contacts 4 and 3 of the relay RL13 are connected, the contacts 5 and 6 are connected, the voltage at the node Vext (i.e., sense +) is output to the second input terminal FB +, and the ground signal at the load terminal (i.e., sense-) is output to the first input terminal FB-. At this time, the sampling point of the feedback voltage is Vext, which is the external feedback.
FB-and FB + are a pair of differential inputs for the purpose of shifting the reference ground of the sampled voltage point along with the position of the sampled point, so that the accuracy of the sampled voltage is higher.
The diode D17 functions to prevent current from flowing backwards.
According to the embodiment of the invention, the relay driving circuit comprises a triode and a diode, wherein a coil of the relay is connected with the diode in parallel, a first end formed by the parallel connection is connected with a preset power supply voltage, and a second end formed by the parallel connection is connected with a collector of the triode; the base electrode of the triode is used for receiving the first control signal, and the emitting electrode of the triode is grounded.
The predetermined power voltage may be any power voltage, which is not limited in the present invention. The structure of the relay driving circuit has been described above with reference to fig. 4, and the present embodiment can be understood with reference to the above description, which is not described herein again.
According to the embodiment of the invention, the programmable gate array module further comprises an ADC module and a DAC module which are in one-to-one correspondence with the at least one power generation circuit, wherein an input end of the ADC module is connected with the voltage feedback end, an output end of the ADC module is connected with an input end of the corresponding gate array sub-module, and the ADC module is configured to perform ADC on an analog voltage signal sampled from the voltage feedback end to obtain a digital voltage signal; the gate array submodule is used for calculating and generating a digital control signal according to the digital voltage signal and the ideal digital voltage signal; the DAC module is used for converting the digital control signal into an analog control signal and outputting the analog control signal to the control end of the power generation circuit so as to adjust the output voltage of the power generation circuit.
Referring back to fig. 3, the ADC module and DAC module comprised by the programmable gate array module are shown. In the example shown in fig. 3, the DAC module is combined with an AMP (amplification) module, and the DAC & AMP module shown in fig. 3 can be regarded as one DAC module. Of course, the AMP module may not be present and the programming gate array module may contain only a separate DAC module.
According to the embodiment of the invention, the gate array submodule is used for calculating and generating a digital control signal according to the digital voltage signal, the ideal digital voltage signal and a preset formula; the coefficients in the preset formula are related to the conversion coefficients calibrated by the ADC module and the conversion coefficients calibrated by the DAC module.
Illustratively, the magnitude of the digital control signal may be calculated by the following formula: vctrl represents the magnitude of the digital control signal, Vi represents the magnitude of the ideal digital voltage signal, and Vfd represents the magnitude of the digital voltage signal output by the ADC module. And k is a coefficient of a preset formula, and is related to the conversion coefficient after the ADC module is calibrated and the coefficient after the DAC module is calibrated.
The ADC module itself has the conversion formula: vfd — k1 × Vfd _ a + b 1; wherein Vfd _ a is an analog voltage value input to the ADC block (i.e. an analog voltage fed back by the voltage feedback terminal), and k1 and b1 are conversion coefficients of the ADC block.
The DAC module itself also has the conversion formula: vctrl _ a — k2 × Vctrl + b 2; where Vctrl _ a is an analog voltage value (i.e., an analog control signal) output by the DAC module, and k2 and b2 are conversion coefficients of the DAC module.
k is related to k1, k2, b1, b 2. k1, k2, b1 and b2 are intrinsic parameters of the ADC module and the DAC module, but in practical applications, these parameters may also have variations due to variations in resistance-capacitance. Therefore, digital control signals can be calculated in the gate array sub-modules based on the calibrated k1, k2, b1, b2 to obtain more accurate control effect. Those skilled in the art can understand the calibration method of the conversion coefficients of the ADC module and the DAC module, which is not described herein.
According to the embodiment of the present invention, the power generation circuit 200 may include a switching power supply submodule and a linear power supply submodule, wherein an input terminal of the switching power supply submodule is used as an input terminal of the power generation circuit 200, and the switching power supply submodule is configured to convert a received initial power supply voltage into a first voltage under the control of a second control signal; the input end of the linear power supply submodule is connected with the output end of the switching power supply submodule, the output end of the linear power supply submodule is used as a preset internal feedback end, and the linear power supply submodule is used for regulating the first voltage into the second voltage under the control of the third control signal.
The switching power supply submodule is a module capable of realizing the function of the switching power supply. By way of example and not limitation, the switching power supply sub-module may include a direct current-to-direct current (DC-DC) conversion chip.
The linear power supply sub-module is a module that can implement the function of a linear power supply. By way of example and not limitation, the linear power supply sub-module may include an LDO linear regulator chip.
The second control signal and the third control signal may come from any suitable circuit or device, such as from the controller connected to the adjustable voltage source described above.
The linear power supply submodule is connected with the switching power supply submodule to form a two-stage power supply. The two-stage power supply converts or regulates the voltage received by the two-stage power supply, and finally, the initial power supply voltage input from the switching power supply submodule can be converted into the required second voltage and the second voltage can be output from the output end of the linear power supply submodule.
The range of the output voltage of the switching power supply is relatively large, but the output noise is also relatively large. While the output noise of the linear power supply is relatively low, the output voltage range is limited, and the efficiency of the power supply is relatively low.
The above embodiments may combine the advantages of both switching power supplies and linear power supplies by a two stage power supply design. In the two-stage power supply, a first stage adopts a switching power supply submodule to enlarge the range of the output voltage of the power supply, and a second stage adopts a linear power supply submodule to inhibit the noise output by the switching power supply submodule of the first stage. Therefore, the two-stage power supply design of the invention can simultaneously meet the requirements of noise, power supply efficiency, voltage output range and the like.
According to the embodiment of the present invention, the control terminal of the power generation circuit 200 is the control terminal of the linear power submodule.
For example, the control signal output by the DAC module may be input to an FB pin terminal (i.e., a control terminal of the linear power supply sub-module) of the LDO linear regulator chip.
According to another aspect of the present invention, there is provided an adjustable voltage source comprising at least one power generating circuit and the PID control system described above.
According to another aspect of the present invention, there is provided an image signal generator comprising the above voltage source.
According to the embodiment of the present invention, the image signal generator further comprises a controller for sending a first control signal to any one of the at least one power generation circuit through a transmission block in the gate array sub-module of the adjustable voltage source; and/or the transmission block in the gate array submodule of the adjustable voltage source is also used for transmitting the voltage signal fed back by the voltage feedback end to the controller.
The embodiment of transmitting the first control signal through the transmission block in the gate array sub-module has been described above, and is not described herein again.
According to the embodiment of the invention, the controller is also used for transmitting the voltage signal fed back by the voltage feedback end to the upper computer for displaying.
The upper computer displays the voltage signal fed back by the voltage feedback end, so that a user can conveniently check the value of the output voltage of the current power supply generating circuit, and the user can conveniently master the working state of the adjustable voltage source.
According to an embodiment of the present invention, when the PID control system adopts the PID control system 100 including the feedback voltage selection module, the controller is further configured to receive a user selection instruction from the upper computer, generate a corresponding first control signal based on the user selection instruction, and transmit the first control signal to the feedback voltage selection module through the transmission block in the gate array sub-module, where the user selection instruction is used to indicate that the voltage feedback terminal is one of a preset inner feedback terminal and a preset outer feedback terminal.
Whether the voltage feedback end is the preset inner feedback end or the preset outer feedback end can be selected by a user through an upper computer. The scheme allows a user to independently select whether to adopt internal feedback or external feedback according to the precision requirement, and the user experience is good.
Although the illustrative embodiments have been described herein with reference to the accompanying drawings, it is to be understood that the foregoing illustrative embodiments are merely exemplary and are not intended to limit the scope of the invention thereto. Various changes and modifications may be effected therein by one of ordinary skill in the pertinent art without departing from the scope or spirit of the present invention. All such changes and modifications are intended to be included within the scope of the present invention as set forth in the appended claims.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
The above description is only for the specific embodiment of the present invention or the description thereof, and the protection scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the protection scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (14)
1. A PID control system for an adjustable voltage source comprising at least one power generating circuit, each for providing a supply voltage to a load, wherein the PID control system comprises:
the programmable gate array module comprises gate array sub-modules which correspond to the power generation circuits one to one;
the input end of the gate array submodule is connected with the corresponding voltage feedback end of the power generation circuit, the output end of the gate array submodule is connected with the corresponding control end of the power generation circuit and used for adjusting the output voltage of the power generation circuit based on the voltage fed back by the voltage feedback end, and the voltage feedback end is a preset inner feedback end or a preset outer feedback end.
2. The PID control system of claim 1, further comprising: feedback voltage selection modules in one-to-one correspondence with the at least one power generation circuit,
the input end of the feedback voltage selection module is respectively connected with the corresponding preset inner feedback end and the preset outer feedback end, the output end of the feedback voltage selection module is connected with the input end of the programmable gate array module, and the control end of the feedback voltage selection module is used for being connected with the output end of the controller;
the feedback voltage selection module is used for controlling the voltage feedback end to switch between the preset inner feedback end and the preset outer feedback end under the control of the first control signal.
3. The PID control system of claim 2, wherein the feedback voltage selection module includes a switch sub-module and a switch control sub-module, wherein,
the input end of the switch submodule is connected with the preset inner feedback end and the preset outer feedback end respectively, and the output end of the switch submodule is connected with the input end of the gate array submodule;
the input end of the switch control submodule is used as the control end of the feedback voltage selection module, the output end of the switch control submodule is connected with the control end of the switch submodule,
the switch control submodule is used for controlling the input end of the switch submodule to switch between the preset inner feedback end and the preset outer feedback end under the control of the first control signal.
4. The PID control system of claim 3, wherein the switch sub-module is a relay and the switch control sub-module is a relay drive circuit, wherein,
the input end of the relay driving circuit is used for receiving the first control signal, the output end of the relay driving circuit is connected with the coil input end of the relay, and the relay driving circuit is used for generating a driving signal for driving the contact of the relay to be switched on or switched off under the control of the first control signal;
a first common contact of the relay is connected with a first input end of the gate array submodule, and a first normally open contact and a first normally closed contact of the relay are grounded;
a second common contact of the relay is connected with a second input end of the gate array submodule, a second normally open contact of the relay is connected with a first feedback end, and a second normally closed contact of the relay is connected with a second feedback end, wherein the first feedback end and the second feedback end are different and are respectively one of the preset inner feedback end and the preset outer feedback end;
wherein the first input terminal and the second input terminal form a pair of differential input terminals.
5. The PID control system of claim 4, wherein the relay drive circuit comprises a transistor and a diode, wherein,
a coil of the relay is connected with the diode in parallel, a first end formed by the parallel connection is connected with a preset power supply voltage, and a second end formed by the parallel connection is connected with a collector electrode of the triode;
and the base electrode of the triode is used for receiving the first control signal, and the emitting electrode of the triode is grounded.
6. The PID control system of any one of claims 1 to 5, wherein the programmable gate array module further comprises an analog-to-digital conversion module and a digital-to-analog conversion module in one-to-one correspondence with the at least one power generation circuit, wherein,
the input end of the analog-to-digital conversion module is connected with the voltage feedback end, the output end of the analog-to-digital conversion module is connected with the input end of the corresponding gate array sub-module, and the analog-to-digital conversion module is used for performing analog-to-digital conversion on an analog voltage signal sampled from the voltage feedback end to obtain a digital voltage signal;
the gate array submodule is used for calculating and generating a digital control signal according to the digital voltage signal and the ideal digital voltage signal;
the input end of the digital-to-analog conversion module is connected with the output end of the corresponding gate array submodule, the output end of the digital-to-analog conversion module is connected with the control end of the power generation circuit, and the digital-to-analog conversion module is used for converting the digital control signal into an analog control signal and outputting the analog control signal to the control end of the power generation circuit so as to adjust the output voltage of the power generation circuit.
7. The PID control system of claim 6, wherein the gate array sub-module is configured to calculate and generate a digital control signal based on the digital voltage signal, the ideal digital voltage signal, and a preset formula;
and the coefficient in the preset formula is related to the conversion coefficient calibrated by the analog-to-digital conversion module and the conversion coefficient calibrated by the digital-to-analog conversion module.
8. The PID control system of any one of claims 1 to 5, wherein the power generation circuit comprises a switching power supply sub-module and a linear power supply sub-module, wherein,
the input end of the switching power supply submodule is used as the input end of the power supply generation circuit, and the switching power supply submodule is used for converting the received initial power supply voltage into a first voltage under the control of a second control signal;
the input end of the linear power supply submodule is connected with the output end of the switching power supply submodule, the output end of the linear power supply submodule is used as the preset internal feedback end, and the linear power supply submodule is used for regulating the first voltage into a second voltage under the control of a third control signal.
9. The PID control system of claim 7, wherein the control terminal of the power generation circuit is a control terminal of the linear power submodule.
10. An adjustable voltage source comprising at least one power generation circuit and a PID control system as claimed in any one of claims 1 to 9.
11. An image signal generator comprising an adjustable voltage supply as claimed in claim 10.
12. The image signal generator of claim 11, wherein the image signal generator further comprises a controller for sending the first control signal to any of the at least one power generation circuit through a transmission block in the gate array sub-module of the adjustable voltage source; and/or
The transmission block in the gate array submodule of the adjustable voltage source is further used for transmitting the voltage signal fed back by the voltage feedback end to the controller.
13. The image signal generator according to claim 12, wherein the controller is further configured to transmit the voltage signal fed back by the voltage feedback terminal to an upper computer for displaying.
14. The image signal generator according to claim 12, wherein, when the PID control system employs the PID control system according to any one of claims 2 to 5,
the controller is further configured to receive a user selection instruction from an upper computer, generate a corresponding first control signal based on the user selection instruction, and transmit the first control signal to the feedback voltage selection module through a transmission block in the gate array submodule, where the user selection instruction is used to indicate that the voltage feedback terminal is one of the preset inner feedback terminal and the preset outer feedback terminal.
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