CN113342116B - Voltage reference setting circuit capable of being adjusted in program control mode and hardware equipment - Google Patents
Voltage reference setting circuit capable of being adjusted in program control mode and hardware equipment Download PDFInfo
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- CN113342116B CN113342116B CN202110735807.XA CN202110735807A CN113342116B CN 113342116 B CN113342116 B CN 113342116B CN 202110735807 A CN202110735807 A CN 202110735807A CN 113342116 B CN113342116 B CN 113342116B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D10/00—Energy efficient computing, e.g. low power processors, power management or thermal management
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Abstract
The invention provides a programmable voltage reference setting circuit, which comprises: the first operational amplifier circuit and the second operational amplifier circuit; the first end of the first operational amplifier circuit is used for receiving an output voltage setting reference signal; the second end of the first operational amplifier circuit is connected with the first end of the isolation resistor; the second end of the isolation resistor is connected with a transmitting port of the reference voltage output signal; the first end of the second operational amplifier circuit is used for receiving the normal judgment reference signal and is connected with the second end of the first operational amplifier circuit; the second end of the second operational amplifier circuit is connected with the first end of the switching device, and the second end of the switching device is connected with the second end of the isolation resistor. The invention uses the operational amplifier circuit to form an output reference voltage comparison circuit to judge whether the output voltage setting reference signal, namely the program control voltage reference is in a normal range or not, thereby outputting a corresponding voltage reference value.
Description
Technical Field
The invention belongs to the technical field of power electronics, and particularly relates to a programmable voltage reference setting circuit.
Background
At present, along with increasing intelligent requirements of power supplies, a single chip microcomputer is designed for a plurality of switching power supplies, and program control voltage regulation, protection and other functions are realized.
Although the design of the singlechip is added to improve the intelligent level of the power supply, the reliability is also reduced due to the addition of extra circuit hardware and software.
If the voltage reference given by the singlechip deviates greatly, abnormal values of the output voltage of the power supply can be caused, so that the fault of a later stage load is caused.
Disclosure of Invention
Aiming at the problem of abnormal setting of power supply output voltage when a given program-controlled voltage reference is abnormal, such as a singlechip, the invention provides a program-controlled voltage reference setting circuit and hardware equipment.
The invention provides a programmable voltage reference setting circuit, which comprises: the first operational amplifier circuit and the second operational amplifier circuit;
the first end of the first operational amplifier circuit is used for receiving an output voltage setting reference signal;
the second end of the first operational amplifier circuit is connected with the first end of the isolation resistor;
the second end of the isolation resistor is connected with a transmitting port of the reference voltage output signal;
the first end of the second operational amplifier circuit is used for receiving the normal judgment reference signal and is connected with the second end of the first operational amplifier circuit;
the second end of the second operational amplifier circuit is connected with the first end of the switching device, and the second end of the switching device is connected with the second end of the isolation resistor.
Further, the method comprises the steps of,
the switching device is a diode;
the direction of the switching device is determined according to the judgment condition of the voltage reference setting circuit:
when the output voltage setting reference signal is used for judging whether the output voltage setting reference signal is lower than a specified threshold value, the first end of the switching device is a diode anode, and the second end of the switching device is a cathode of the diode;
when the output voltage setting reference signal is higher than a specified threshold, the second terminal of the switching device is the diode anode, and the first terminal of the switching device is the diode cathode.
Further, the method comprises the steps of,
the first operational amplifier circuit comprises a follower circuit for amplifying the output voltage setting reference signal;
the second operational amplifier circuit comprises a first comparator circuit for judging whether the voltage setting reference signal amplified by the first operational amplifier circuit meets a specified threshold value according to the normal judging reference signal:
if the voltage is met, the switching device is turned off, and the first operational amplifier circuit outputs an output voltage setting reference signal as a reference voltage output signal;
if the voltage is not satisfied, the switching device is turned on, and the second operational amplifier circuit outputs a default voltage reference signal as a reference voltage output signal.
Further, the method comprises the steps of,
the first operational amplifier circuit comprises a first resistor and a follower circuit which are connected in series;
the follower circuit includes a follower;
one end of the first resistor is connected to a receiving port of the output voltage setting reference signal;
the other end of the first resistor is connected with the same-direction input end of the follower;
the output end of the follower is connected with the reverse input end of the follower to form a feedback circuit;
the positive electrode of the working power supply of the follower is connected with the working power supply, and the negative electrode of the working power supply is grounded;
the output end of the follower is grounded through a second resistor and is connected to a transmitting port of a reference voltage output signal through a third resistor;
the output end of the follower sends the amplified output voltage setting reference signal into a comparator of the second operational amplifier circuit;
the output end of the follower is connected with the reverse input end of the comparator in the second operational amplifier circuit through a fifth resistor.
Further, the method comprises the steps of,
the second operational amplifier circuit comprises a fourth resistor, a first comparator circuit and a first diode which are connected in series;
one end of the fourth resistor is connected with a receiving port of the normal judgment reference signal;
the other end of the fourth resistor is connected with the first comparator circuit;
the first comparator circuit comprises the first comparator, a sixth resistor, a fifth resistor and a seventh resistor;
the other end of the fourth resistor is connected with the positive input port of the first comparator;
the fifth resistor is connected with the reverse input port of the first comparator;
the output port of the first comparator is connected with the positive input port of the first comparator through a sixth resistor to form a feedback circuit;
the output port of the first comparator is connected with one end of a seventh resistor, and the other end of the seventh resistor is grounded through an eighth resistor;
the other end of the seventh resistor is connected with the anode of the first diode, the cathode of the first diode is connected with the third resistor, and the cathode of the first diode is connected with the transmitting port of the reference voltage output signal.
Further, the method comprises the steps of,
the eighth resistance is less than 1/10 of the third resistance.
Further, the circuit also comprises a third operational amplifier circuit,
the third operational amplifier circuit comprises a ninth resistor, a second comparator circuit and a second diode which are connected in series;
one end of the ninth resistor is connected with the receiving port of the normal judgment reference signal;
the other end of the ninth resistor is connected with the second comparator circuit;
the second comparator circuit comprises a second comparator, a tenth resistor, the fifth resistor and an eleventh resistor;
the other end of the ninth resistor is connected with the reverse input port of the second comparator;
the fifth resistor is connected with the positive input port of the second comparator;
the output port of the second comparator is connected with the positive input port of the second comparator through a tenth resistor to form a feedback circuit;
the output port of the second comparator is connected with one end of an eleventh resistor, and the other end of the eleventh resistor is connected with a working power supply of the second comparator through a twelfth resistor;
the other end of the eleventh resistor is connected with the cathode of the second diode, the anode of the second diode is connected with the third resistor, and the anode of the second diode is connected with the transmitting port of the reference voltage output signal.
The present invention also provides a hardware device, comprising: the device comprises a program control module, a voltage reference setting circuit and a power supply module;
the program control module is connected with the voltage reference setting circuit;
the voltage reference setting circuit is connected with the power supply module;
the program control module sends an output voltage setting reference signal to the voltage reference setting circuit through the singlechip;
the voltage reference setting circuit judges whether the voltage reference setting circuit meets the threshold requirement or not, and outputs a reference voltage output signal to the power supply module according to the judging result;
wherein, the voltage reference setting circuit is: a programmable voltage reference setting circuit as described above.
The invention uses the operational amplifier circuit to form an output reference voltage comparison circuit to judge whether the output voltage setting reference signal, namely the program control voltage reference is in a normal range or not, thereby outputting a corresponding voltage reference value. When the program control voltage reference is not in the normal range, the program control voltage reference is output by default voltage reference set by hardware. When the program control voltage reference is in the normal range, the power supply outputs with the program control voltage reference. Therefore, the safety of the controlled power supply module and the safety of the rear-stage device are improved, and intelligent and safe power supply output control management is realized.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a programmable voltage reference setting circuit according to an embodiment of the invention;
FIG. 2 shows a schematic circuit diagram of a programmable voltage reference setting circuit according to an embodiment of the invention;
FIG. 3 shows a schematic circuit diagram of another programmable voltage reference setting circuit according to an embodiment of the invention;
fig. 4 shows a schematic diagram of a hardware device according to an embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a voltage reference setting circuit (voltage reference setting circuit for short) capable of being regulated in a program-controlled way, as shown in fig. 1, the voltage reference setting circuit comprises: the first end of the first operational amplifier circuit is used for receiving the output voltage setting reference signal, the second end of the first operational amplifier circuit is connected with the first end of the isolation resistor, and the second end of the isolation resistor is connected with a transmitting port (Vref) of the reference voltage output signal; the first end of the second operational amplifier circuit is used for receiving the normal judgment reference signal and is connected with the second end of the first operational amplifier circuit; the second end of the second operational amplifier circuit is connected with the first end of the switching device, and the second end of the switching device is connected with the second end of the isolation resistor. "connected" in embodiments of the present invention is electrically connected, including directly connected or indirectly connected, such as via conductors or power electronics. Illustratively, the switching device is a diode (not limited to a diode, a single channel switch STMPS2161, etc. may be used). The direction of the switching device (connected to the transmission port of the reference voltage output signal via the cathode or anode) is determined according to the judgment condition of the voltage reference setting circuit. For example, when it is required to determine whether the output voltage setting reference signal is lower than a specified threshold, the first end of the switching device is a diode anode, the second end of the switching device is a diode cathode, i.e., the diode is connected, and the diode cathode is connected with the transmission port of the reference voltage output signal; when the output voltage setting reference signal is required to be judged whether to be higher than a specified threshold value, the second end of the switching device is a diode anode, and the first end of the switching device is a cathode of the diode, namely the diode is reversely connected.
Wherein the first operational amplifier circuit comprises a follower circuit for amplifying the output voltage setting reference signal. The second operational amplifier circuit comprises a first comparator circuit for judging whether the voltage setting reference signal amplified by the first operational amplifier circuit meets a specified threshold value according to the normal judging reference signal, if so (if the voltage setting reference signal is higher than the lowest threshold value or lower than the highest threshold value), the switching device is turned off, and the first operational amplifier circuit outputs the output voltage setting reference signal as a reference voltage output signal; if the voltage is not satisfied (for example, is lower than the lowest threshold or higher than the highest threshold), the switching device is turned on, and the second operational amplifier circuit outputs the output default voltage reference signal as a reference voltage output signal. Illustratively, the specified threshold is the lowest voltage or the highest voltage, and whether the specified threshold is satisfied is whether the voltage setting reference signal is higher than the lowest voltage or lower than the highest voltage.
The voltage reference setting circuit is applied to hardware equipment capable of adjusting voltage in a programmable manner, and the hardware setting is used for adjusting voltage through a single chip microcomputer, namely, an output voltage setting reference signal is sent to the power supply module through the single chip microcomputer. The voltage reference setting circuit in the embodiment of the invention is arranged between the singlechip and the power supply module and is used for monitoring whether an output voltage setting reference signal output by the singlechip meets the requirement. When the singlechip works, an output voltage setting reference signal is sent, the output voltage setting reference signal is output through an isolation resistor after a first operational amplifier circuit of the follower circuit is built, meanwhile, a signal output by the first operational amplifier circuit is input into a comparator circuit of a second operational amplifier circuit, whether the output voltage setting reference signal is in a normal range or not is compared, when the output voltage setting reference signal is normal, the comparator circuit outputs a low level, and at the moment, a diode is reversely cut off, and the first operational amplifier circuit is not influenced to normally send the output voltage setting reference signal out and is used as a reference voltage output signal. When the output voltage setting reference signal is in an abnormal range, if the output voltage setting reference signal is lower than a specified threshold (first threshold), the comparator circuit outputs a high level, the diode is turned on in the forward direction, and the second operational amplifier circuit outputs a default voltage reference signal as a reference voltage output signal. The default voltage reference signal is a default working voltage determined according to a hardware device where the circuit is located.
The specific circuit configuration of the programmable voltage reference setting circuit according to the embodiment of the present invention will be further described with reference to fig. 2.
The description will be made taking as an example whether or not the output voltage setting reference signal is higher than the minimum voltage, i.e., whether or not the first threshold value is satisfied. As shown in fig. 2, the first operational amplifier circuit includes a first resistor R1 and a follower circuit connected in series, and the follower circuit includes a follower N1A. One end of the first resistor R1 is connected with a receiving port for outputting a voltage setting reference signal Vset, the other end of the first resistor R1 is connected with the same-direction input end of the follower N1A, and the output end of the follower N1A is connected with the reverse input end of the follower N1A to form a feedback circuit. The positive electrode of the working power supply of the follower N1A is connected with the working power supply VCC, and the negative electrode of the working power supply is grounded. The output end of the follower N1A is grounded through the second resistor R2 on the one hand, and is connected to the transmitting port of the reference voltage output signal Vref through the isolation resistor, i.e., the third resistor R3 on the other hand, and on the other hand, the output end of the follower N1A sends the amplified output voltage setting reference signal into the comparator N1B of the second op-amp circuit. The output end of the follower N1A is connected with the reverse input end of the comparator N1B in the second operational amplifier circuit through a fifth resistor R5. In the embodiment of the present invention, the follower N1A may use a follower chip.
The second operational amplifier circuit includes a fourth resistor R4, a first comparator circuit, and a first diode V1 connected in series. One end of the fourth resistor R4 is connected to the receiving port of the normal determination reference signal Vr, and the other end of the fourth resistor R4 is connected to the first comparator circuit. The first comparator circuit includes a first comparator N1B, a sixth resistor R6, a fifth resistor R5, and a seventh resistor R7. The other end of the fourth resistor R4 is connected with the positive input port of the first comparator N1B, the fifth resistor R5 is connected with the negative input port of the first comparator N1B, and the output port of the first comparator N1B is connected with the positive input port of the first comparator N1B through a sixth resistor R6 to form a feedback circuit. The output port of the first comparator N1B is further connected to one end of a seventh resistor R7, and the other end of the seventh resistor R7 is grounded through an eighth resistor R8. The other end of the seventh resistor R7 is connected to the anode of the first diode V1, the cathode of the first diode V1 is connected to the third resistor R3, and the cathode of the first diode V1 is connected to the transmission port of the reference voltage output signal. The positive electrode (VCC) of the working power supply of the first comparator N1B is connected to the working power supply VCC, and the negative electrode of the working power supply of the first comparator N1B is grounded. In the embodiment of the present invention, the first comparator NIB may employ a comparator chip.
The specific working process of the voltage reference setting circuit is as follows: when the singlechip works normally and sends an output voltage setting reference signal (program control voltage reference) Vset, the Vset isolates the output reference voltage output signal Vref through R3 after passing through a follower circuit built by N1A, and meanwhile, N1B of a second operational amplifier circuit is used as a comparator to compare whether the Vset is in an abnormal range or not: when Vset is normal, the first comparator N1B outputs a low level, and at this time, the first diode V1 is turned off reversely, so that the output reference voltage output signal Vref is not affected in the normal operating condition, and is the same as the output voltage setting reference signal Vset set by the singlechip.
When the output voltage setting reference signal Vset sent by the singlechip is abnormal, if the Vset is lower than the normal determination reference signal Vr. The first comparator N1B compares the Vr and the output signal of the follower N1A, so that the N1B outputs a high level, at this time, the output voltage of the resistor divided by the R7 and the resistor R8 is greater than the Vset value, the first diode V1 is turned on in the forward direction, and the output reference voltage output signal Vref is forcibly set to the default voltage reference signal preset value of the hardware (i.e., the resistor divided voltage value of the R7 and the resistor divided by the R8), so that when the program-controlled voltage reference is abnormal, the power supply outputs the output default voltage reference signal set by the hardware.
In the embodiment of the invention, the resistance value of R8 is far smaller than the resistance value of the isolation resistor R3 and smaller than 1/10 of the resistance value of the R3 resistor so as to reduce the influence of R3 access on the partial pressure of R7 and R8. When the Vset is normal, V1 is cut off, R7 and R8 are not connected to the transmission port of the reference voltage output signal, the N1A output signal is output through R3, when the N1A output signal is abnormal, because V1 is conducted, R7 and R8 are connected to the transmission port of the reference voltage output signal, because the R8 impedance is far smaller than R3, and the current transmitted to the reference output through R3 by the N1A output signal is negligible.
The normal range of the output voltage setting reference signal Vset is, for example, 20-33V, and when the single chip microcomputer is abnormal, less than 20V (Vr) may occur, at this time, the first comparator N1B outputs a high level to control the first diode V1 to be turned on, and a default voltage reference signal, that is, a voltage value divided by the resistors of the hardware R7 and R8, for example, a voltage reference signal of 24V is output.
Further, when judging whether the output voltage setting reference signal is in an abnormal range, it is also possible to judge whether the output voltage setting reference signal is within a specified section range. For example, based on the above circuit configuration, a comparator N1C is added to determine whether Vset is higher than the second threshold. As shown in fig. 3, the circuit of the programmable voltage reference setting circuit includes a first operational amplifier circuit, a second operational amplifier circuit, and a third operational amplifier circuit. The structures of the first operational amplifier circuit and the second operational amplifier circuit are the same as those of the first operational amplifier circuit and the second operational amplifier circuit in the circuit of fig. 2, and the specific steps are as follows:
the first operational amplifier circuit comprises a first resistor R1 and a follower circuit which are connected in series, and the follower circuit comprises a follower N1A. One end of the first resistor R1 is connected to a receiving port of the output voltage setting reference signal Vset, the other end of the first resistor R1 is connected to the same-direction input end of the follower N1A, and the output end (OUT) of the follower N1A is connected to the reverse input end of the follower N1A, so as to form a feedback circuit. The positive electrode of the working power supply of the follower N1A is connected with the working power supply VCC, and the negative electrode of the working power supply is grounded. The output end of the follower N1A is grounded through the second resistor R2 on the one hand, and is connected to the transmitting port of the reference voltage output signal Vref through the isolation resistor, i.e., the third resistor R3 on the other hand, and on the other hand, the output end of the follower N1A sends the amplified output voltage setting reference signal into the first comparator N1B of the second operational amplifier circuit and the second comparator N1C of the third operational amplifier circuit. The output end of the follower N1A is connected with the reverse input end of the first comparator N1B in the second operational amplifier circuit through a fifth resistor R5. The output end of the follower N1A is connected with the reverse input end of the second comparator N1C in the third operational amplifier circuit through a fifth resistor R5. In the embodiment of the present invention, the follower N1A may use a follower chip.
The second operational amplifier circuit includes a fourth resistor R4, a first comparator circuit, and a first diode V1 connected in series. One end of the fourth resistor R4 is connected to the receiving port of the normal determination reference signal Vr, and the other end of the fourth resistor R4 is connected to the first comparator circuit. The first comparator circuit includes a first comparator N1B, a sixth resistor R6, a fifth resistor R5, and a seventh resistor R7. The other end of the fourth resistor R4 is connected with the positive input port of the first comparator N1B, the fifth resistor R5 is connected with the negative input port of the first comparator N1B, and the output port of the first comparator N1B is connected with the positive input port of the first comparator N1B through a sixth resistor R6 to form a feedback circuit. The output port of the first comparator N1B is further connected to one end of a seventh resistor R7, and the other end of the seventh resistor R7 is grounded through an eighth resistor R8. The other end of the seventh resistor R7 is connected to the anode of the first diode V1, the cathode of the first diode V1 is connected to the third resistor R3, and the cathode of the first diode V1 is connected to the transmission port of the reference voltage output signal. The positive electrode of the working power supply of the first comparator N1B is connected to the working power supply VCC, and the negative electrode of the working power supply of the first comparator N1B is grounded. In the embodiment of the present invention, the first comparator NIB may employ a comparator chip.
The third operational amplifier circuit includes a ninth resistor R9, a second comparator circuit, and a second diode V2 connected in series. One end of the ninth resistor R9 is connected to the receiving port of the normal determination reference signal Vr, and the other end of the ninth resistor R9 is connected to the second comparator circuit. The second comparator circuit includes a second comparator N1C, a tenth resistor R10, a fifth resistor R5, and an eleventh resistor R11. The other end of the ninth resistor R9 is connected with the reverse input port of the second comparator N1C, the fifth resistor R5 is connected with the forward input port of the second comparator N1C, and the output port of the second comparator N1C is connected with the forward input port of the second comparator N1C through a tenth resistor R10 to form a feedback circuit. The output port of the second comparator N1C is further connected to one end of an eleventh resistor R11, and the other end of the eleventh resistor R11 is connected to the operating power VCC of the second comparator through a twelfth resistor R12. That is, one end of the twelfth resistor R12 is connected to the other end of the eleventh resistor R11, and the other end of the twelfth resistor R12 is connected to VCC. The other end of the eleventh resistor R11 is connected to the cathode of the second diode V2, the anode of the second diode V2 is connected to the third resistor R3, and the anode of the second diode V2 is connected to the transmission port of the reference voltage output signal. The positive electrode of the working power supply of the second comparator N1C is connected to the working power supply VCC, and the negative electrode of the working power supply of the second comparator N1C is grounded. In the embodiment of the present invention, the second comparator NIC may use a comparator chip.
When the singlechip works, an output voltage setting reference signal is sent to a first operational amplifier circuit of the follower circuit, and then the reference voltage output signal is output through the isolation resistor, and meanwhile, the signal output by the first operational amplifier circuit is input into a first comparator circuit of a second operational amplifier circuit and a second comparator circuit of a third operational amplifier circuit. The first comparator circuit compares whether the output voltage setting reference signal is higher than a first threshold value, when the output voltage setting reference signal is normal (higher than the first threshold value and lower than a second threshold value), the first comparator circuit outputs a low level, the second comparator circuit outputs a high level, and at the moment, the first diode and the second diode are both reversely cut off, so that the first operational amplifier circuit is not influenced to normally send the output voltage setting reference signal out to serve as a reference voltage output signal. When the output voltage setting reference signal is lower than a first threshold value, the first comparator circuit outputs a high level, the first diode is conducted in the forward direction, and the second operational amplifier circuit outputs a default voltage reference signal as a reference voltage output signal. Also, when the output voltage setting reference signal is higher than the second threshold, the second comparator circuit outputs a low level, the second diode is turned on in the forward direction, and the third operational amplifier circuit outputs a default voltage reference signal (R11 and R12 divided output voltage values) as a reference voltage output signal.
In another embodiment, the voltage reference setting circuit may also include only the first operational amplifier circuit and the third operational amplifier circuit, so as to determine whether the voltage meets the second threshold, i.e. meets the requirement of being lower than the highest voltage.
The embodiment of the invention also provides hardware equipment, as shown in fig. 4, which comprises a program control module, a voltage reference setting circuit and a power supply module. The program control module comprises a single chip microcomputer, the program control module is connected with a voltage reference setting circuit, the voltage reference setting circuit is connected with the power supply module, the program control module sends an output voltage setting reference signal to the voltage reference setting circuit through the single chip microcomputer, the voltage reference setting circuit judges whether the voltage reference setting circuit meets the threshold requirement or not, and the voltage reference setting circuit outputs a reference voltage output signal to the power supply module according to the judging result so as to control the power supply module to work normally, and the safety of electric equipment at the rear stage of the power supply module is guaranteed. The voltage reference setting circuit is the voltage reference setting circuit capable of being adjusted in a program control mode.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A programmable voltage reference setting circuit, comprising: the first operational amplifier circuit and the second operational amplifier circuit;
the first operational amplifier circuit comprises a follower circuit for amplifying the output voltage setting reference signal;
the first end of the first operational amplifier circuit is used for receiving an output voltage setting reference signal;
the second end of the first operational amplifier circuit is connected with the first end of the isolation resistor;
the second end of the isolation resistor is connected with a transmitting port of the reference voltage output signal;
the second operational amplifier circuit comprises a first comparator circuit for judging whether the voltage setting reference signal amplified by the first operational amplifier circuit meets a specified threshold value according to the normal judging reference signal: if the voltage is met, the switching device is turned off, and the first operational amplifier circuit outputs an output voltage setting reference signal as a reference voltage output signal;
if the voltage reference signal does not meet the preset voltage reference signal, the switching device is turned on, and the second operational amplifier circuit outputs the output default voltage reference signal as a reference voltage output signal;
the first end of the second operational amplifier circuit is used for receiving the normal judgment reference signal and is connected with the second end of the first operational amplifier circuit;
the second end of the second operational amplifier circuit is connected with the first end of the switching device, and the second end of the switching device is connected with the second end of the isolation resistor;
the circuit also comprises a third operational amplifier circuit,
the third operational amplifier circuit comprises a ninth resistor, a second comparator circuit and a second diode which are connected in series;
one end of the ninth resistor is connected with the receiving port of the normal judgment reference signal;
the other end of the ninth resistor is connected with the second comparator circuit;
the second comparator circuit comprises a second comparator, a tenth resistor, a fifth resistor and an eleventh resistor;
the other end of the ninth resistor is connected with the reverse input port of the second comparator;
the fifth resistor is connected with the positive input port of the second comparator;
the output port of the second comparator is connected with the positive input port of the second comparator through a tenth resistor to form a feedback circuit;
the output port of the second comparator is connected with one end of an eleventh resistor, and the other end of the eleventh resistor is connected with a working power supply of the second comparator through a twelfth resistor;
the other end of the eleventh resistor is connected with the cathode of the second diode, the anode of the second diode is connected with the third resistor, and the anode of the second diode is connected with the transmitting port of the reference voltage output signal.
2. The programmable voltage reference setting circuit of claim 1, wherein,
the switching device is a diode;
the direction of the switching device is determined according to the judgment condition of the voltage reference setting circuit:
when the output voltage setting reference signal is used for judging whether the output voltage setting reference signal is lower than a specified threshold value, the first end of the switching device is a diode anode, and the second end of the switching device is a cathode of the diode;
when the output voltage setting reference signal is higher than a specified threshold, the second terminal of the switching device is the diode anode, and the first terminal of the switching device is the diode cathode.
3. The programmable voltage reference setting circuit of claim 1, wherein,
the first operational amplifier circuit comprises a first resistor and a follower circuit which are connected in series;
the follower circuit includes a follower;
one end of the first resistor is connected to a receiving port of the output voltage setting reference signal;
the other end of the first resistor is connected with the same-direction input end of the follower;
the output end of the follower is connected with the reverse input end of the follower to form a feedback circuit;
the positive electrode of the working power supply of the follower is connected with the working power supply, and the negative electrode of the working power supply is grounded;
the output end of the follower is grounded through a second resistor and is connected to a transmitting port of a reference voltage output signal through a third resistor;
the output end of the follower sends the amplified output voltage setting reference signal into a comparator of the second operational amplifier circuit;
the output end of the follower is connected with the reverse input end of the comparator in the second operational amplifier circuit through a fifth resistor.
4. The programmable voltage reference setting circuit of claim 3, wherein,
the second operational amplifier circuit comprises a fourth resistor, a first comparator circuit and a first diode which are connected in series;
one end of the fourth resistor is connected with a receiving port of the normal judgment reference signal;
the other end of the fourth resistor is connected with the first comparator circuit;
the first comparator circuit comprises the first comparator, a sixth resistor, a fifth resistor and a seventh resistor;
the other end of the fourth resistor is connected with the positive input port of the first comparator;
the fifth resistor is connected with the reverse input port of the first comparator;
the output port of the first comparator is connected with the positive input port of the first comparator through a sixth resistor to form a feedback circuit;
the output port of the first comparator is connected with one end of a seventh resistor, and the other end of the seventh resistor is grounded through an eighth resistor;
the other end of the seventh resistor is connected with the anode of the first diode, the cathode of the first diode is connected with the third resistor, and the cathode of the first diode is connected with the transmitting port of the reference voltage output signal.
5. The programmable voltage reference setting circuit of claim 4, wherein,
the eighth resistance is less than 1/10 of the third resistance.
6. A hardware device, comprising: the device comprises a program control module, a voltage reference setting circuit and a power supply module;
the program control module is connected with the voltage reference setting circuit;
the voltage reference setting circuit is connected with the power supply module;
the program control module sends an output voltage setting reference signal to the voltage reference setting circuit through the singlechip;
the voltage reference setting circuit judges whether the voltage reference setting circuit meets the threshold requirement or not, and outputs a reference voltage output signal to the power supply module according to the judging result;
wherein, the voltage reference setting circuit is: a programmable voltage reference setting circuit as claimed in any one of claims 1 to 5.
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