CN209930135U - Power signal generating circuit and driving device - Google Patents
Power signal generating circuit and driving device Download PDFInfo
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- CN209930135U CN209930135U CN201920387588.9U CN201920387588U CN209930135U CN 209930135 U CN209930135 U CN 209930135U CN 201920387588 U CN201920387588 U CN 201920387588U CN 209930135 U CN209930135 U CN 209930135U
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Abstract
The application discloses power signal produces circuit and drive arrangement, this power signal produces the circuit and includes: the power supply module is used for providing power supply voltage and feedback voltage; the adjustable current source comprises a variable resistance unit, the variable resistance unit is connected with the power supply module, and the feedback voltage acts on the variable resistance unit to generate variable current; the control module is connected with the adjustable current source and provides a control signal to the adjustable current source so as to adjust the resistance value of the variable resistance unit; and the output resistor is respectively connected with the power supply module and the variable resistance unit, and adjusts the power supply voltage according to the variable current, so that the power supply voltage changes along with the variable current, wherein the feedback voltage is stabilized at a set voltage value.
Description
Technical Field
The utility model relates to a show technical field, more specifically relates to a power signal produces circuit and drive arrangement.
Background
With the development of Liquid Crystal Display (LCD) technology, LCDs have become more and more popular, and in order to protect privacy of users, a privacy function can be implemented by driving a Polymer Dispersed Liquid Crystal (PDLC).
Fig. 1 shows a schematic diagram of a PDLC driving apparatus of the related art, and fig. 2 shows a signal waveform diagram of fig. 1.
As shown in fig. 1 and fig. 2, the power chip 130 provides a feedback voltage Vfb and a switching signal LX, and adjusts the switching signal according to the current flowing through the resistors Rb and Rc; the boost circuit 110 generates a first power voltage VS + according to the switching signal LX and provides the first power voltage VS + to the operation circuit 140 through a diode D and a resistor Ra; the charge pump 120 generates a second power voltage VS-according to the switching signal LX and provides the second power voltage VS-to the operation circuit 140; the operational circuit 140 includes an operational amplifier, receives a power voltage VS + and a second power voltage VS-, and generates a first driving signal AC1 and a second driving signal AC2, in the prior art, since the feedback voltage Vfb provided by the power chip 130 is a constant value and the resistances of the resistors Rb and Rc are fixed, the current flowing through the resistors Rb and Rc is also a constant value, so that the first power voltage VS + and the second power voltage VS-are both constant voltages, as shown in fig. 2. However, the first driving signal AC1 and the second driving signal AC2 for driving the PDLC are AC signals, and the first power voltage VS + and the second power voltage VS-are both constant voltages, which causes a problem of high power consumption of the operational amplifier in the operational circuit 140, and further causes the operational amplifier to generate heat, thereby reducing the service life of the PDLC driving apparatus.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the above-mentioned problem to existence among the prior art provides a power signal production circuit and drive arrangement, has solved the problem of operational amplifier high-power consumption.
According to the utility model discloses an aspect provides a power signal produces circuit, include: the power supply module is used for providing power supply voltage and feedback voltage; the adjustable current source comprises a variable resistance unit, the variable resistance unit is connected with the power supply module, and the feedback voltage acts on the variable resistance unit to generate variable current; the control module is connected with the adjustable current source and provides a control signal to the adjustable current source so as to adjust the resistance value of the variable resistance unit; and the output resistor is respectively connected with the power supply module and the variable resistance unit, and adjusts the power supply voltage according to the variable current so that the power supply voltage changes along with the variable current, wherein the feedback voltage is stabilized at a set voltage value.
Preferably, the variable resistance unit includes: the fixed resistor is connected with the output resistor in series between the output end of the power supply voltage and a reference ground potential, and an intermediate node of the fixed resistor and the output resistor receives the feedback voltage; and at least one accessible resistor, wherein the control signal selectively controls the accessible resistor in parallel with the fixed resistor.
Preferably, the adjustable current source further includes at least one transistor, the number of the transistors corresponds to the number of the accessible resistors, each accessible resistor is connected in series between the corresponding first path terminal of the transistor and the intermediate node, the control terminal of the transistor receives the control signal, and the second path terminal of the transistor is connected to the reference ground potential.
Preferably, the at least one accessible resistance comprises a first accessible resistance, the at least one transistor comprises a first transistor, and the first accessible resistance is connected in series between a first pass terminal of the first transistor and the intermediate node; and the control end of the first transistor receives a first control signal, and the second path end of the first transistor is connected with a reference ground potential.
Preferably, the at least one accessible resistor further comprises a second accessible resistor, the at least one transistor further comprises a second transistor, and the second accessible resistor is connected in series between a first pass terminal of the second transistor and the intermediate node; and the control end of the second transistor receives the second control signal, and the second pass end of the second transistor is connected with a reference ground potential.
Preferably, the power supply module includes: the power unit is used for providing feedback voltage and a switching signal, is connected with the variable resistance unit and adjusts the switching signal according to the variable current; the boosting unit is connected with the power unit and used for providing a first power supply voltage according to the switching signal; and the charge pump is connected with the power unit and used for providing a second power supply voltage according to the switching signal.
Preferably, the power module further includes a diode and a protection resistor, an anode of the diode is connected to the voltage boosting unit, a cathode of the diode is connected to a first end of the protection resistor, and a second end of the protection resistor outputs the first power voltage, wherein the output resistor is connected in series between the cathode of the diode and the intermediate node.
According to the utility model discloses an on the other hand of the embodiment provides a drive arrangement, include: the power supply voltage generation circuit as described above; and at least one arithmetic circuit which is connected with the power supply voltage generating circuit to receive the power supply voltage and generate a driving signal, wherein the driving signal comprises an alternating current signal, and the voltage difference between the power supply voltage and the driving signal is kept at a preset value.
Preferably, the control module switches the level state of the control signal according to a preset condition, wherein the preset condition is set according to the level of the driving signal.
Preferably, the control module comprises a micro control unit.
According to the utility model provides a power signal produces circuit and drive arrangement provides control signal to the resistance of adjustable current source in order to adjust the variable resistance unit through control module to make variable current produce corresponding change, finally make output resistance adjust mains voltage according to the variable current who changes, make mains voltage change along with variable current, compare with prior art, the embodiment of the utility model provides a keep the difference between mains voltage and drive voltage presetting, thereby solved the problem of operational amplifier high-power consumption, and then make operational amplifier's the phenomenon of generating heat reduce, improved PDLC drive arrangement's life.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of a PDLC driving device of the prior art.
Fig. 2 shows a signal waveform diagram of fig. 1.
Fig. 3 shows a schematic block diagram of a power signal generating circuit according to an embodiment of the present invention.
Fig. 4 shows a schematic structural diagram of a power signal generating circuit according to an embodiment of the present invention.
Fig. 5 shows a schematic diagram of a driving device of a PDLC according to an embodiment of the present invention.
Fig. 6 shows a signal waveform diagram of fig. 5.
Detailed Description
The invention will be described in more detail below with reference to the accompanying drawings. Like elements in the various figures are denoted by like reference numerals. For purposes of clarity, the various features in the drawings are not necessarily drawn to scale. In addition, certain well known components may not be shown.
Numerous specific details of the invention are set forth in the following description in order to provide a more thorough understanding of the invention. However, as will be understood by those skilled in the art, the present invention may be practiced without these specific details.
Fig. 3 shows a schematic block diagram of a power signal generating circuit according to an embodiment of the present invention.
As shown in fig. 3, the power signal generating circuit according to the embodiment of the present invention includes: the circuit comprises a power supply module 210, an adjustable current source 220, a control module 230 and an output resistor R1, wherein the adjustable current source 220 comprises a variable resistance unit 221.
The power module 210 is used for providing a power voltage and a feedback voltage Vfb stabilized at a set voltage value, wherein the power voltage includes a first power voltage VS + and a second power voltage VS-. The output resistor R1 is connected in series between the node Q and the output terminal of the first power voltage VS +, the variable resistor unit 221 is connected to the node Q, the feedback voltage Vfb acts on the variable resistor unit 221 to generate a variable current Ia, the control module 230 provides a control signal to the adjustable current source 220 to adjust the resistance of the variable resistor unit 221, so that the magnitude of the variable current Ia changes with the resistance of the variable resistor unit 221, and the output resistor R1 adjusts the first power voltage VS + according to the variable current Ia, so that the first power voltage VS + changes with the variable current Ia.
Fig. 4 shows a schematic structural diagram of a power signal generating circuit according to an embodiment of the present invention.
As shown in fig. 3 and 4, the power module 210 includes a power unit 211, a boosting unit 212, and a charge pump (chargeable) 213.
The power unit 211 is connected to the boosting unit 212 and the charge pump 213, respectively, to provide the switching signal LX to the boosting unit 212 and the charge pump 213, and the power unit 211 is further connected to the node Q for providing the feedback voltage Vfb stabilized at a set voltage value to the variable resistance unit 221.
The voltage boosting unit 212 is configured to provide a first supply voltage VS at a first output in response to the switching signal LX, and the charge pump 213 is configured to provide a second supply voltage VS at a second output in response to the switching signal LX.
In some preferred embodiments, the power module 210 further includes a diode D1 and a protection resistor R5, an anode D1 of the diode is connected to the voltage boosting unit 212, a cathode of the diode is connected to a first end of the protection resistor R5, a second end of the protection resistor R5 outputs the first power voltage VS +, and an output resistor R1 is connected in series between the cathode of the diode D1 and the node Q.
In the above embodiments, the Power unit 211 is implemented by, for example, a Power chip (Power IC), and the boosting unit is implemented by, for example, a boosting (Boost) circuit.
The variable resistance unit 211 includes a fixed resistor R2 and at least one accessible resistor, the fixed resistor R2 and the output resistor R1 are connected in series between the output terminal of the first power voltage VS + and the reference ground, and the control signal selectively controls the accessible resistor to be connected in parallel with the fixed resistor R2. The adjustable current source 220 further includes at least one transistor, the number of the transistors corresponds to the number of the accessible resistors, each accessible resistor is connected in series between the first path terminal of the corresponding transistor and a node Q, the control terminal of the transistor receives the control signal, and the second path terminal of the transistor is connected to the ground reference potential, wherein the node Q is an intermediate node between the output resistor R1 and the fixed resistor R2.
In some specific embodiments, the at least one accessible resistor includes a first accessible resistor R3 and/or a second accessible resistor R4, the at least one transistor includes a first transistor M1 and/or a second transistor M2, and the control signal includes a first control signal ctr1 and a second control signal ctr 2.
The first accessible resistor R3 is connected in series between the first pass terminal (source) of the first transistor M1 and the node Q, the control terminal (gate) of the first transistor M1 receives the first control signal ctr1 provided by the control module 230, and the second pass terminal (drain) of the first transistor M1 is connected to the ground reference potential. The second accessible resistor R4 is connected in series between the first pass terminal (source) of the second transistor M2 and the node Q, the control terminal (gate) of the second transistor M2 receives the second control signal ctr2 provided by the control module 230, and the second pass terminal (drain) of the second transistor M2 is connected to the reference ground potential.
However, the embodiments of the present invention are not limited thereto, and those skilled in the art may perform other settings on the accessible resistors, the number of transistors, and the control signals corresponding to the accessible resistors as needed.
In the embodiment, the first transistor M1 and the second transistor M2 are N-channel MOS transistors, and the first via terminal and the second via terminal can be interchanged.
Fig. 5 shows a schematic diagram of a driving device of a PDLC according to an embodiment of the present invention, and fig. 6 shows a schematic diagram of a signal waveform of fig. 5.
The principle of the power signal generating circuit and the driving device of the present invention will be described in detail with reference to fig. 4 to 6 and the specific embodiments.
As shown in fig. 5, the operational circuit 300 has at least one operational amplifier, which receives the first power voltage VS + and the second power voltage VS-provided by the power signal generating circuit 200 in fig. 4 and generates the first driving signal AC1 and the second driving signal AC 2.
In some embodiments, the first power voltage VS + is set in 3 steps and is 15V, 20V and 25V, respectively, and the feedback voltage Vfb provided by the power unit 211 is constant at 200 mV.
The power unit 211 provides a switching signal LX to the voltage boost unit 212 and the charge pump 213, respectively, so that the voltage boost unit 212 outputs a first power voltage VS + and a second power voltage VS-, when the first control signal ctr1 and the second control signal ctr2 provided by the control module 230 are both low level signals, the first transistor M1 and the second transistor M2 are turned off, at this time, the resistance value of the variable resistor unit 221 is the same as the resistance value of the resistor R2, and the first power voltage VS + is obtained by using equation (1):
the first power voltage VS + is 15V, the current flowing through the output resistor R1 is Ia, the power unit 211 adjusts the switching signal LX according to the current Ia, and the second power voltage VS-output by the charge pump 213 according to the switching signal LX is-15V by setting the resistance values of R1 and R2.
Further, when the first control signal ctr1 provided by the control module 230 is a high-level signal and the second control signal ctr2 is a low-level signal, the first transistor M1 is turned on and the second transistor M2 is turned off. At this time, the resistance of the variable resistance unit 221 is an equivalent resistance of the resistor R2 and the resistor R3 connected in parallel, and the first power voltage VS +:
since the resistance of the variable resistance unit 221 becomes smaller, the feedback voltage Vfb applied to the variable resistance unit 221 does not change, the current Ia flowing through the output resistor R1 becomes larger, so that the first power voltage VS + increases, the first power voltage VS + is 20V by setting the resistance of R3, the power unit 211 adjusts the switching signal LX according to the increased current Ia, and the second power voltage VS-output by the charge pump 213 according to the switching signal LX is-20V.
Further, when the first control signal ctr1 and the second control signal ctr2 provided by the control module 230 are both high-level signals, the first transistor M1 and the second transistor M2 are both turned on. At this time, the resistance of the variable resistor unit 221 is an equivalent resistance of the resistor R2, the resistor R3, and the resistor R4 connected in parallel, and the first power voltage VS + is obtained by using equation (3):
here, since the resistance value of the variable resistance unit 221 becomes smaller, the feedback voltage Vfb applied to the variable resistance unit 221 does not change, the current Ia flowing through the output resistor R1 becomes larger, so that the first power voltage VS + increases, the first power voltage VS + is set to 25V by setting the resistance value of R4, the power unit 211 adjusts the switching signal LX according to the further increased current Ia, and the second power voltage VS-output by the charge pump 213 according to the switching signal LX is set to-25V.
Further, the control module 230 provides a high-level first control signal ctr1 and a low-level second control signal ctr2, so that the first power voltage VS + is 20V and the second power voltage VS-is-20V, and detailed descriptions of the specific principles are omitted.
By repeating the above steps, the first power voltage VS + and the second power voltage VS-can be both ac conversion signals.
In the embodiment of the present invention, the control module 230 is implemented by a Micro Control Unit (MCU), and is designed by the voltage variation of the first driving signal AC1 and/or the second driving signal AC2 and the resistance of the resistors R1 to R4, and the level states of the first control signal ctr1 and the second control signal ctr2 are switched under the preset condition, so that the instantaneous voltage of the first power voltage VS + is always higher than the first driving signal AC1, and the voltage difference between the two is maintained at the preset value, the instantaneous voltage of the second power voltage VS-is always lower than the second driving signal AC2, and the voltage difference between the two is maintained at the preset value.
Table 1 comparison table of power consumption of driving device in this application and the prior art
| Serial number | Prior art Power consumption (mW) | Power consumption of the present application (mW) | Reduction ratio of power consumption |
| 1 | 528 | 294 | 44.32％ |
| 2 | 522 | 287 | 45.02％ |
| 3 | 514 | 290 | 43.58％ |
| 4 | 520 | 283 | 45.58％ |
Table 1 this application and prior art's drive arrangement consumption contrast table, when testing prior art's power consumption, first mains voltage VS + is constantly 25V, and second mains voltage VS-is constantly-25V, in the test the utility model discloses a during the power consumption, first mains voltage VS + is 3 grades of alternating current signal that change, is 15V, 20V and 25V respectively, and second mains voltage VS-is 3 grades of alternating current signal that change, is-15V, -20V and-25V respectively. In order to ensure the accuracy of test, make four group's contrast tests altogether, the power consumption decline than taking the average value of four group's tests, can know from table 1, the utility model discloses the drive arrangement consumption of embodiment is compared and is reduced about 44.6% in prior art.
According to the utility model provides a power signal produces circuit and drive arrangement provides control signal to the resistance of adjustable current source in order to adjust the variable resistance unit through control module to make variable current produce corresponding change, finally make output resistance adjust mains voltage according to the variable current who changes, make mains voltage change along with variable current, compare with prior art, the embodiment of the utility model provides a keep the difference between mains voltage and drive voltage presetting, thereby solved the problem of operational amplifier high-power consumption, and then make operational amplifier's the phenomenon of generating heat reduce, improved PDLC drive arrangement's life.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
In accordance with the embodiments of the present invention as set forth above, these embodiments are not exhaustive and do not limit the invention to the precise embodiments described. The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any person skilled in the art can make various changes, modifications, etc. without departing from the scope of the present invention. The embodiments were chosen and described in order to best explain the principles of the invention and its practical application, to thereby enable others skilled in the art to best utilize the invention and its various embodiments with various modifications as are suited to the particular use contemplated.
Claims (10)
1. A power signal generation circuit, comprising:
the power supply module is used for providing power supply voltage and feedback voltage;
the adjustable current source comprises a variable resistance unit, the variable resistance unit is connected with the power supply module, and the feedback voltage acts on the variable resistance unit to generate variable current;
the control module is connected with the adjustable current source and provides a control signal to the adjustable current source so as to adjust the resistance value of the variable resistance unit; and
an output resistor connected to the power module and the variable resistance unit, respectively, for adjusting the power voltage according to the variable current so that the power voltage varies with the variable current,
wherein, the feedback voltage is stabilized at a set voltage value.
2. The power signal generation circuit of claim 1, wherein the variable resistance unit comprises:
the fixed resistor is connected with the output resistor in series between the output end of the power supply voltage and a reference ground potential, and an intermediate node of the fixed resistor and the output resistor receives the feedback voltage; and
at least one of the accessible resistors is connected to the resistor,
wherein the control signal selectively controls the accessible resistance in parallel with the fixed resistance.
3. The power signal generating circuit of claim 2, wherein the adjustable current source further comprises at least one transistor, the number of the transistors corresponds to the number of the accessible resistors, each accessible resistor is connected in series between the first pass terminal of the corresponding transistor and the intermediate node, the control terminal of the transistor receives the control signal, and the second pass terminal of the transistor is connected to a ground reference potential.
4. The power signal generating circuit of claim 3, wherein the at least one accessible resistor comprises a first accessible resistor, the at least one transistor comprises a first transistor,
the first accessible resistance is connected in series between a first pass end of the first transistor and the intermediate node;
and the control end of the first transistor receives a first control signal, and the second path end of the first transistor is connected with a reference ground potential.
5. The power signal generating circuit of claim 4, wherein the at least one accessible resistor further comprises a second accessible resistor, the at least one transistor further comprises a second transistor,
the second accessible resistor is connected in series between the first pass end of the second transistor and the intermediate node;
and the control end of the second transistor receives a second control signal, and the second pass end of the second transistor is connected with a reference ground potential.
6. The power signal generation circuit of claim 5, wherein the power module comprises:
the power unit is used for providing feedback voltage and a switching signal, is connected with the variable resistance unit and adjusts the switching signal according to the variable current;
the boosting unit is connected with the power unit and used for providing a first power supply voltage according to the switching signal; and
and the charge pump is connected with the power unit and used for providing a second power supply voltage according to the switching signal.
7. The power signal generating circuit of claim 6, wherein the power module further comprises a diode and a protection resistor,
the anode of the diode is connected with the boosting unit, the cathode of the diode is connected with the first end of the protection resistor, the second end of the protection resistor outputs the first power voltage,
wherein the output resistor is connected in series between the cathode of the diode and the intermediate node.
8. A drive device, comprising:
the power supply signal generating circuit of any one of claims 1-7; and
at least one arithmetic circuit connected to the power signal generating circuit to receive the power voltage and generate a driving signal,
wherein the driving signal comprises an alternating current signal, and a voltage difference between the power supply voltage and the driving signal is kept at a preset value.
9. The driving apparatus as claimed in claim 8, wherein the control module switches the level state of the control signal according to a preset condition,
wherein the preset condition is set according to a level of the driving signal.
10. The drive of claim 9, wherein the control module comprises a micro control unit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920387588.9U CN209930135U (en) | 2019-03-26 | 2019-03-26 | Power signal generating circuit and driving device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920387588.9U CN209930135U (en) | 2019-03-26 | 2019-03-26 | Power signal generating circuit and driving device |
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| CN209930135U true CN209930135U (en) | 2020-01-10 |
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| CN201920387588.9U Active CN209930135U (en) | 2019-03-26 | 2019-03-26 | Power signal generating circuit and driving device |
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