CN114326893B - 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 includes at least one power generation circuit, each for providing a power supply voltage to a load, wherein the PID control system includes: the programmable gate array module comprises gate array sub-modules which are in one-to-one correspondence with the power supply generating circuits; the input end of the gate array submodule is connected with the voltage feedback end of the corresponding power supply generating circuit, the output end of the gate array submodule is connected with the control end of the corresponding power supply generating circuit and used for adjusting the output voltage of the power supply generating 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. 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 fast 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
The image signal generator (Pattern Generator, PG) is a signal generating device that can generate different image test signals in response to different instructions to realize the test of display panels such as a liquid crystal display (Liquid Crystal Display, LCD) and an Organic Light-Emitting Diode (OLED).
The image signal generator can generate multiple paths of power supply signals for providing different power supply signals for the display panel to be tested (i.e. the screen to be tested) for testing. The multiple power signals may be generated using multiple power generation circuits and provided to a load (i.e., a panel under test). In the testing process of the screen to be tested, in order to ensure the testing effect, the stability of the power supply voltage provided by the power supply generating circuit needs to be ensured.
Accordingly, it is desirable to provide a technique capable of effectively ensuring the stability of each path of power supply voltage supplied from an image signal generator.
Disclosure of Invention
The present invention has been made in view of the above-described 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 comprising at least one power generation circuit, each power generation circuit being arranged to provide a supply voltage to a load, wherein the PID control system comprises: the programmable gate array module comprises gate array sub-modules which are in one-to-one correspondence with the power supply generating circuits; the input end of the gate array submodule is connected with the voltage feedback end of the corresponding power supply generating circuit, the output end of the gate array submodule is connected with the control end of the corresponding power supply generating circuit and used for adjusting the output voltage of the power supply generating 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.
Illustratively, the PID control system further comprises: the input end of the feedback voltage selection module is respectively connected with the corresponding preset inner feedback end and the corresponding 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 be switched between a preset inner feedback end and a preset outer feedback end under the control of the first control signal.
The feedback voltage selection module comprises a switch sub-module and a switch control sub-module, wherein the input end of the switch sub-module is respectively connected with the preset inner feedback end and the preset outer feedback end, and the output end of the switch sub-module is connected with the input end of the gate array sub-module; the input end of the switch control sub-module is used as the control end of the feedback voltage selection module, the output end of the switch control sub-module is connected with the control end of the switch sub-module, and the switch control sub-module is used for controlling the input end of the switch sub-module to switch between a preset inner feedback end and a preset outer feedback end under the control of a first control signal.
The switch sub-module is a relay, the switch control sub-module 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; the first common contact of the relay is connected with the first input end of the door array sub-module, and the first normally open contact and the first normally closed contact of the relay are grounded; the second common contact of the relay is connected with the second input end of the gate array sub-module, the second normally open contact of the relay is connected with the first feedback end, the second normally closed contact of the relay is connected with the second feedback end, and 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.
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, wherein the analog-to-digital conversion module and the digital-to-analog conversion module are in one-to-one correspondence with at least one power supply generating circuit, 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 carrying out analog-to-digital conversion on the analog voltage signal sampled from the voltage feedback end so as 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 an 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 sub-module, the output end of the digital-to-analog conversion module is connected with the control end of the power supply 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 supply generation circuit so as to regulate the output voltage of the power supply generation circuit.
Illustratively, 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; the coefficients in the preset formula are related to the conversion coefficients calibrated by the analog-to-digital conversion module and the conversion coefficients calibrated by the digital-to-analog conversion module.
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 sub-module is used as the input end of the power generation circuit, and the switching power supply sub-module 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 sub-module is connected with the output end of the switching power supply sub-module, the output end of the linear power supply sub-module is used as a preset internal feedback end, and the linear power supply sub-module is used for adjusting the first voltage to 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 sub-module.
According to another aspect of the present invention, there is provided an adjustable voltage source comprising at least one power generation 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 adjustable voltage source.
The image signal generator further comprises a controller for transmitting 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 controller is also used for transmitting the voltage signal fed back by the voltage feedback end to the upper computer for display.
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 host 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 sub-module, where the user selection instruction is used to instruct the voltage feedback end to be one of a preset inner feedback end and a preset outer feedback end.
According to the PID control system of the adjustable voltage source, the adjustable voltage source and the image signal generator, stability of power supply voltages of all paths provided by the image signal generator can be effectively guaranteed. 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 from the following more particular description of embodiments of the present invention, as illustrated in the accompanying drawings. The accompanying drawings are included to provide a further understanding of embodiments of the invention and are incorporated in and constitute a part of this specification, illustrate the invention and together with the embodiments of the invention, and not constitute a limitation to the invention. In the drawings, like reference numerals generally refer to like parts or steps.
FIG. 1 shows a schematic block diagram of a PID control system for an adjustable voltage source, a power supply generation circuit, and a load according to an embodiment of the invention;
FIG. 2 shows 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 driving 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 with reference to the accompanying drawings. It should be apparent that the described embodiments are only some embodiments of the present invention and not all embodiments of the present invention, and it should be understood that the present invention is not limited by the example embodiments described herein. Based on the embodiments of the invention described in the present application, all other embodiments that a person skilled in the art would have without inventive effort shall fall within the scope of the invention.
In order to at least partially solve the above-mentioned 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 of 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 one embodiment of the invention. Fig. 2 shows a schematic block diagram of a more specific embodiment of a PID control system 100 of an adjustable voltage source and a 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 merely examples and are not limiting, and the PID control system 100 and the power generation circuit 200 provided in the embodiments 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 includes at least one power generation circuit 200, each power generation circuit 200 for providing a supply voltage to a load 300. Different power supply generating circuits 200 may supply different power supply voltages to the same load 300, or may supply the same or different power supply 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 in one-to-one correspondence with the power generation circuit 200; the input end of the gate array sub-module 122 is connected with the voltage feedback end of the corresponding power supply generating circuit 200, and the output end of the gate array sub-module 122 is connected with the control end of the corresponding power supply generating circuit 200, and is used for adjusting the output voltage of the power supply generating 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 end and the preset outer feedback end are relative concepts. The preset inner feedback terminal may be a node near the output terminal (node U4) of the power generation circuit 200, and the preset 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 greater.
The PID control system 100 can include a programmable gate array module 120. By way of example and not limitation, 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 at least one power generation circuit 200. In practical applications, the programmable gate array module 120 may employ a programmable gate array chip, and the at least one power generation circuit 200 may share the programmable gate array chip.
There is a transmission line between the power generation circuit 200 and the load 300 (the transmission line between nodes U4 and Vext is a dashed line in fig. 1, indicating that other modules or devices may exist therebetween), and there is a certain degree of loss in the process of transmitting the power supply voltage signal to the load by the power generation circuit 200. Therefore, the voltage output by the power supply generation circuit 200 may not coincide with the voltage actually input to the load 300. In performing PID adjustment for the power generation circuit 200, either internal feedback (node U4) or external feedback (e.g., node Vext) may be selected. That is, the internal feedback and the external feedback have different voltage sampling precision, and further have different voltage adjustment precision, and a user can select a proper feedback mode according to the needs.
The output of the gate array sub-module 122 is connected to the control 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 derivative (Proportional, integrating, differentiation) control loop, which is called PID control loop for short. An inherent drawback of the power supply is that when the load current increases, the output voltage may start to drop, i.e. the power supply may have a problem of load regulation. This problem is solved very well by using a PID control loop in the power supply, which can maintain the output voltage at a set voltage value, regardless of the load current.
Embodiments of the present invention are implemented using programmable hardware programmable gate array modules. The programmable gate array module can sample at the voltage output place, can automatically complete PID calculation and adjustment without communication with a complex control system (such as a singlechip), and can rapidly control the output voltage in real time. Furthermore, a programmable gate array is a type of programmable hardware that, unlike a processing unit (CPU), is single threaded, and can execute code in parallel upon solidification of logic circuits by the programmable gate array. Therefore, the embodiment of the invention can independently and simultaneously carry out PID adjustment on the output voltages of different power supply generating circuits through the programmable gate array module, thereby adjusting the speed block.
In summary, the PID control system according to the embodiment of the invention can effectively ensure the stability of each path of power supply voltage provided by the image signal generator. In addition, the PID control system can independently and synchronously carry out PID adjustment on a plurality of (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 adjustment 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 input ends of the feedback voltage selection modules are respectively connected with corresponding preset inner feedback ends and 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 connected with the output ends of the controller; the feedback voltage selection module is used for controlling the voltage feedback end to be switched 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.
Illustratively, 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 of the programmable gate array module 120 corresponding to the current power generation circuit 200. The first control signal may be transmitted by the controller to the feedback voltage selection module through a transmission block in a gate array sub-module in the programmable gate array module 120. At this time, the function of the programmable gate array module 120 can be understood as one transmission line.
By way of example and not 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, wherein the position can be a preset inner feedback end (U4) or a preset outer feedback end (Vext). When the requirement on sampling precision is not high, the voltage of the U4 node (namely the power supply output end is also an internal feedback point) can be sampled; when the sampling accuracy is high, the voltage of the Vext node (namely the load end and the external feedback point) can be sampled.
For example, the user may select internal feedback or external feedback on the upper computer, and the upper computer sends a request to the controller according to the selection operation, and the controller generates a first control signal (drvrlrlay-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 selecting module may control whether the voltage sampling feedback point is at the Vext node or the U4 node according to the first control signal (drvrlrlay-fb), and feedback the sampled voltage to an analog-to-digital conversion (ADC) module, for subsequent processes, see the PID adjustment process described above.
Through the feedback voltage selection module, a user can independently select internal feedback or external feedback according to the 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 sub-module and a switch control sub-module, wherein the input end of the switch sub-module is respectively connected with the preset inner feedback end and the preset outer feedback end, and the output end of the switch sub-module is connected with the input end of the gate array sub-module; the input end of the switch control sub-module is used as the control end of the feedback voltage selection module, the output end of the switch control sub-module is connected with the control end of the switch sub-module, and the switch control sub-module is used for controlling the input end of the switch sub-module to switch between a preset inner feedback end and a preset outer feedback end under the control of a first control signal.
The switch sub-module is a relatively simple module capable of enabling the input end to be switched between the preset inner feedback end and the 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. The feedback voltage selection module has 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, 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; the first common contact of the relay is connected with the first input end of the door array sub-module, and the first normally open contact and the first normally closed contact of the relay are grounded; the second common contact of the relay is connected with the second input end of the gate array sub-module, the second normally open contact of the relay is connected with the first feedback end, the second normally closed contact of the relay is connected with the second feedback end, and 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 driving circuit and a relay (i.e., relay 1). The relay 2 shown in fig. 3 is used to control the connection and disconnection of the transmission line between the power generation circuit 200 and the load 300, and is not related to the PID control described herein, and is not described herein. The voltage fed back by the node U4 or the node Vext can be controlled to be analog-digital converted by the relay 1 and then input to 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 limiting of the invention, and the invention may be used without these devices or with other devices further. Further, the current sampling module shown in fig. 3 is also an example, which may not be present. In addition, the power generation circuit 200 shown in fig. 3 includes a Low Dropout (LDO) linear voltage 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 driving circuit and a relay in a feedback voltage selection module according to one embodiment of the invention. As shown in fig. 4, the relay driving 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 drvlelay-FB is low, transistor Q23 is non-conductive, contacts 2 and 3 of relay RL13 are connected, contacts 6 and 7 are connected, the voltage at 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 drvlelay-FB is high, 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 of the node Vext (i.e., sense+) is output to the second input terminal fb+, and the ground signal (i.e., sense-) of the load terminal is output to the port first input terminal FB-. At this time, the sampling point of the feedback voltage is Vext, which is external feedback.
FB-and FB+ are a pair of differential inputs for the purpose of shifting the reference ground of the sampling voltage point along with the position of the sampling point so that the accuracy of the sampling voltage is higher.
The diode D17 functions to prevent current reverse-filling.
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 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 preset power supply voltage may be any power supply voltage, which is not limited by the present invention. The structure of the relay driving circuit has been described above in conjunction with fig. 4, and the present embodiment can be understood with reference to the above description, and will not be repeated here.
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 at least one power supply generating circuit, wherein the input end of the ADC module is connected with the voltage feedback end, the output end of the ADC module is connected with the input end of the corresponding gate array sub-module, and the ADC module is used for carrying out ADC on the analog voltage signal sampled from the voltage feedback end so as 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 an ideal digital voltage signal; the input end of the DAC module is connected with the output end of the corresponding gate array sub-module, the output end of the DAC module is connected with the control end of the power supply generation circuit, and the DAC module is used for converting digital control signals into analog control signals and outputting the analog control signals to the control end of the power supply generation circuit so as to regulate the output voltage of the power supply generation circuit.
Referring back to fig. 3, the programmable gate array module is shown to include an ADC module and a DAC module. 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 program gate array module may include 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 after calibration of the ADC module and the conversion coefficients after calibration of the DAC module.
Illustratively, the magnitude of the digital control signal may be calculated by the following formula: vctrl=k=vi—vfd|, where 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 block. k is a coefficient of a preset formula, which is related to the conversion coefficient after calibration of the ADC module and the coefficient after calibration of the DAC module.
The ADC module itself has a conversion formula: vfd=k1 vfd_a+b1; wherein vfd_a is an analog voltage value (i.e., an analog voltage fed back by a voltage feedback terminal) input to the ADC module, and k1 and b1 are conversion coefficients of the ADC module.
The DAC module itself also has the conversion formula: vctrl_a=k2 vctrl+b2; wherein vctrl_a is an analog voltage value (i.e., analog control signal) converted and 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, b2 are intrinsic parameters of the ADC module and the DAC module, but in practical application, these parameters may also deviate due to the deviation of resistance and capacitance. Accordingly, digital control signals can be calculated in the gate array sub-module based on the calibrated k1, k2, b1, b2 to obtain a more accurate control effect. Those skilled in the art can understand the calibration manners of the conversion coefficients of the ADC module and the DAC module, which are not described herein.
According to an embodiment of the present invention, the power generation circuit 200 may include a switching power supply sub-module and a linear power supply sub-module, where an input terminal of the switching power supply sub-module is used as an input terminal of the power generation circuit 200, and the switching power supply sub-module is used to convert the received initial power supply voltage into the first voltage under the control of the second control signal; the input end of the linear power supply sub-module is connected with the output end of the switching power supply sub-module, the output end of the linear power supply sub-module is used as a preset internal feedback end, and the linear power supply sub-module is used for adjusting the first voltage to the second voltage under the control of the third control signal.
The switching power supply sub-module 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 capable of realizing 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 voltage regulator chip.
The second control signal and the third control signal may be from any suitable circuit or device, for example from the controller described above connected to the adjustable voltage source.
The linear power supply submodule is connected with the switching power supply submodule to form a two-stage power supply. The two-stage power supplies each convert or regulate the voltage received by the two-stage power supplies, and finally, the initial power supply voltage input from the switching power supply submodule can be converted into a required second voltage and the second voltage is output from the output end of the linear power supply submodule.
The output voltage of the switching power supply has a relatively large range, but the output noise is 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 can combine the advantages of a switching power supply and a linear power supply by a two-stage power supply design. In the two-stage power supply, a switching power supply submodule is adopted in the first stage to expand the range of power supply output voltage, and a linear power supply submodule is adopted in the second stage to inhibit noise output by the switching power supply submodule of the first stage. Therefore, the two-stage power supply design can simultaneously meet the requirements of noise, power supply efficiency, voltage output range and the like.
According to an embodiment of the present invention, the control terminal of the power generation circuit 200 is the control terminal of the linear power sub-module.
For example, the control signal output by the DAC module may be input to the FB pin of the LDO linear voltage regulator chip (i.e., the control terminal of the linear power supply sub-module).
According to another aspect of the present invention, there is provided an adjustable voltage source comprising at least one power generation circuit and the PID control system described above.
According to another aspect of the present invention, there is provided an image signal generator including the above voltage source.
According to an embodiment of the present invention, the image signal generator further includes a controller for transmitting a first control signal to any one of the at least one power generation circuits 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 embodiments of transmitting the first control signal through the transport block in the gate array sub-module have been described above and will not be described here 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 display.
The upper computer displays the voltage signal fed back by the voltage feedback end, so that a user can check the value of the output voltage of the current power supply generating circuit conveniently, and the user can grasp the working state of the adjustable voltage source conveniently.
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 host 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 end is one of a preset inner feedback end and a preset outer feedback end.
The voltage feedback end is a preset inner feedback end or a preset outer feedback end, which can be selected by a user through an upper computer. The scheme allows the 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 above illustrative embodiments are merely illustrative and are not intended to limit the scope of the present invention thereto. Various changes and modifications may be made therein by one of ordinary skill in the art without departing from the scope and spirit of the 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 solution. 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 use of the words first, second, third, etc. do not denote any order. These words may be interpreted as names.
The foregoing description is merely illustrative of specific embodiments of the present invention and the scope of the present invention is not limited thereto, and any person skilled in the art can easily think about variations or substitutions within the scope of the present invention. The protection scope of the invention is subject to the protection scope of the claims.
Claims (11)
1. A PID control system of an adjustable voltage source comprising at least one power generation circuit, each power generation circuit for providing a power supply voltage to a load, wherein the PID control system comprises:
the programmable gate array module comprises gate array sub-modules which are in one-to-one correspondence with the power supply generating circuits;
the input end of the gate array sub-module is connected with the corresponding voltage feedback end of the power supply generating circuit, the output end of the gate array sub-module is connected with the corresponding control end of the power supply generating circuit, and the gate array sub-module is used for adjusting the output voltage of the power supply generating 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 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,
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 carrying out analog-to-digital conversion on the analog voltage signal sampled from the voltage feedback end so as 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 an 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 supply generating 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 supply generating circuit so as to regulate the output voltage of the power supply generating circuit;
the PID control system further comprises: feedback voltage selection modules in one-to-one correspondence with the at least one power supply generation circuit,
the input end of the feedback voltage selection module is respectively connected with the corresponding preset inner feedback end and the corresponding 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 be switched between the preset inner feedback end and the preset outer feedback end under the control of a first control signal;
the feedback voltage selection module comprises a switch sub-module and a switch control sub-module, wherein,
the input end of the switch sub-module is connected with the preset inner feedback end and the preset outer feedback end respectively, and the output end of the switch sub-module is connected with the input end of the gate array sub-module;
the input end of the switch control sub-module is used as the control end of the feedback voltage selection module, the output end of the switch control sub-module is connected with the control end of the switch sub-module,
the switch control sub-module is used for controlling the input end of the switch sub-module to switch between the preset inner feedback end and the preset outer feedback end under the control of the first control signal.
2. The PID control system of claim 1, wherein the switch sub-module is a relay, 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;
the first common contact of the relay is connected with the first input end of the door array submodule, and the first normally open contact and the first normally closed contact of the relay are grounded;
the second common contact of the relay is connected with the second input end of the gate array submodule, the second normally-open contact of the relay is connected with the first feedback end, and the 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 the preset inner feedback end and the preset outer feedback end;
wherein the first input and the second input form a pair of differential inputs.
3. The PID control system of claim 2, wherein the relay drive circuit comprises a transistor and a diode, wherein,
the 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 the 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.
4. The PID control system of claim 1, 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 equation;
the coefficients in the preset formula are related to the conversion coefficients calibrated by the analog-to-digital conversion module and the conversion coefficients calibrated by the digital-to-analog conversion module.
5. The PID control system of any one of claims 1-3, 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 sub-module is used as the input end of the power supply generating circuit, and the switching power supply sub-module 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 sub-module is connected with the output end of the switching power supply sub-module, the output end of the linear power supply sub-module is used as the preset internal feedback end, and the linear power supply sub-module is used for adjusting the first voltage to the second voltage under the control of a third control signal.
6. The PID control system of claim 5, wherein the control terminal of the power generation circuit is the control terminal of the linear power sub-module.
7. An adjustable voltage source comprising at least one power generation circuit and a PID control system as claimed in any of claims 1-6.
8. An image signal generator comprising the adjustable voltage source of claim 7.
9. The image signal generator of claim 8, wherein the image signal generator further comprises a controller for sending a first control signal to any one of the at least one power generation circuits through a transmission block in the gate array sub-module of the adjustable voltage source; and/or
The transmission block in the gate array sub-module of the adjustable voltage source is further configured to transmit a voltage signal fed back by the voltage feedback end to the controller.
10. The image signal generator of claim 9, wherein the controller is further configured to transmit the voltage signal fed back by the voltage feedback terminal to an upper computer for display.
11. The image signal generator of claim 9 wherein,
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 sub-module, where the user selection instruction is configured to instruct the voltage feedback end to be one of the preset inner feedback end and the preset outer feedback end.
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