CN219122587U - Voltage limiting output control circuit and device thereof - Google Patents
Voltage limiting output control circuit and device thereof Download PDFInfo
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- CN219122587U CN219122587U CN202222330153.5U CN202222330153U CN219122587U CN 219122587 U CN219122587 U CN 219122587U CN 202222330153 U CN202222330153 U CN 202222330153U CN 219122587 U CN219122587 U CN 219122587U
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Abstract
A voltage-limiting output control circuit relates to the field of voltage-regulating circuits. The voltage stabilizing device comprises a voltage stabilizing module, a voltage feedback module and a control module, wherein the voltage stabilizing module is connected with the voltage feedback module, the voltage feedback module comprises a plurality of resistors which are connected in parallel, the control module is connected with the voltage feedback module, the voltage feedback module is provided with a resistor switch, the resistor switch is used for controlling the connection state among a plurality of resistors, the control module is provided with a control unit, the control unit is connected with the resistor switch, and the control unit is used for selecting the state of the resistor switch by detecting a switch signal sent by the control module and outputting the control signal. The utility model realizes that the corresponding control signal is directly regenerated by generating the switching signal in the MCU normal work, namely, the working voltage is normally and stably output to the equipment connected subsequently at the output end, and the mode can be used for adjusting the output voltage by setting the switching signal generated by the control module, so that the flexibility is higher.
Description
Technical Field
The utility model relates to the field of voltage regulating circuits, in particular to a voltage limiting output control circuit and a device thereof.
Background
The stage lamp is used as equipment with high heat productivity, is complex and various in applicable environment, and is often used in high-temperature environments, so that heat dissipation treatment can be performed on the design, and an air cooling system is used for performing heat dissipation treatment on the lamp, so that more fans can be installed in the lamp. However, fans with different sizes and specifications are required to be installed at different positions and positions of the lamp, wherein rated driving voltages and currents of different fans are not the same, for example, the driving voltages of the fans are 12V, 24V and the like, voltage limiting treatment is required on the hard design of the fans with different voltages, adaptive hardware element parameters are required to be selected on the hardware driving to limit the output highest voltage of the fan driving, so that protection of the fans is realized, if the highest voltage limiting output of a fan driving circuit is not performed, the fans are very easy to burn out due to overvoltage, for example, for a fan with the voltage of 12V, the highest voltage limiting output of the circuit is 24V, and in the using process, when the fan circuit outputs the fan with the highest voltage of 24V to the fan with the voltage of 12V, the fans are burnt out. If the fan cannot be found and replaced in time due to burning, the lamp is damaged due to the fact that heat cannot be dissipated in time in the using process of the stage lamp, and huge loss is caused.
The current voltage limiting setting of the fan in the hardware circuit is mainly realized by selecting the resistance values of feedback circuits with different specifications, namely, the highest output voltage of the driving circuit is configured by welding resistors with different resistance values at the same position on the same circuit board, when the feedback resistance specification of one circuit board is selected, the maximum voltage output by the circuit board is fixed, only the fan with the corresponding rated voltage can be driven, the multi-purpose of one circuit board component cannot be realized, the use limitation of the circuit board component is caused, the management and the recycling of materials are not facilitated, and in summary, how to design a circuit with strong anti-interference capability, high reliability and high practicability is realized.
In the prior art, in order to further improve the output voltage of the circuit board, the output voltage is often regulated by combining with the feedback end of the voltage stabilizing circuit, in the hardware driving circuit, the output voltage is controlled by the voltage feedback unit, and the control of the output voltage of VOUT can be realized only by changing the resistance value of (R1// R2// R3 …// Rn), so that the control of the output voltage is realized by changing the control mode of the parallel resistor in the voltage feedback network and mainly controlling the resistance switch by setting different logic levels through the MCU I/O port, namely the control module, for example, closing the resistance switch when setting logic '0'; when a logic '1' is set, a resistance switch is turned on, and at the moment, a switch unit is completely controlled by the level of an MCU I/O port, and the technology has a disadvantage that: in order to make the output voltage of the MCU I/O pin uncertain when the MCU processor is powered on and not configured or when the MCU processor receives an abnormal operation of external ESD interference, the MCU I/O pin is possibly in a high-level 1/low-level 0/high-resistance state, and the circuit cannot work according to the expected requirement.
Disclosure of Invention
The utility model aims to overcome at least one defect of the prior art and provides a voltage limiting output control circuit and a device thereof, so as to solve the problem of single rated voltage output by the existing hardware circuit.
The voltage limiting output control circuit comprises a voltage stabilizing module, a voltage feedback module and a control module, wherein the voltage stabilizing module is connected with the voltage feedback module and used for receiving a voltage regulating signal of the voltage feedback module to control and regulate output voltage, the voltage feedback module comprises a plurality of resistors connected in parallel, the control module is connected with the voltage feedback module and used for controlling parallel resistance values of the voltage feedback module, the voltage feedback module is provided with a resistance switch which is used for controlling connection states among the plurality of resistors, the control module is connected with a control unit, the other end of the control unit is connected with the resistance switch and used for controlling the states of the resistance switch, and the control unit is used for selecting the states of the resistance switch by detecting switching signals sent by the control module and outputting control signals so as to regulate the parallel resistance values of the plurality of resistors. The utility model further limits the output voltage (Vout) through the insertion of the software internal structure, wherein the utility model codes and controls the control module to generate a switching signal, the switching signal is the highest limit corresponding to Vout, after the research and development writing are carried out to enable the control module to generate the switching signal, the control unit detects the switching signal, and when the corresponding switching signal is detected, the control unit regenerates the control unit into a corresponding control signal, such as logic '1' or logic '0', the control signal corresponds to the later parallel resistor connection state, namely, the parallel resistor resistance value is controlled, and when the voltage stabilizing module detects the resistance value of the voltage feedback unit at the feedback end, the corresponding voltage is output, and the utility model realizes that: the corresponding control signal is directly regenerated by generating the switching signal in the MCU normal operation, namely, the working voltage is normally and stably output to the equipment connected subsequently at the output end, and the output voltage can be regulated by setting the switching signal generated by the control module, so that the flexibility is higher.
Preferably, the voltage stabilizing module further comprises a grounding end.
Preferably, the voltage stabilizing module comprises a feedback end, an input end and an output end, wherein one end of the control module is output and connected with the resistance switch and used for controlling the resistance value of the voltage feedback module, the other end of the control module is output and connected with the feedback end, one end of the voltage feedback module is connected with the output end, and the other end of the voltage feedback module is connected with the feedback end.
Preferably, the switching signal comprises a pulse signal, the control unit comprises an isolation unit, the isolation unit comprises at least one capacitor, and the non-pulse signal from the control module is isolated through the capacitor. In the utility model, when the output of the control module is uncertain and the high level '1'/low level '0'/high resistance state is possible, the common characteristic of the three states is that the three states are detected as a constant state, and when the control module further outputs a pulse signal, the signal tends to fluctuate within a certain range, and according to the law of signal change, the utility model adopts the capacitor to charge the pulse signal and isolate the pulse signal under the constant state, so as to distinguish the state of the input end of the control module.
Further, the control unit further comprises a judging module, and the judging module is used for converting the isolated switch signal into a control signal. In the above scheme, the differentiated switch signal may be directly output as a control signal in an ac state, or a signal conversion circuit may be further provided to normalize the output of the control signal and convert it into a simple logic level.
Preferably, the control unit further comprises an isolation unit, a guiding unit, a charging unit, a voltage dividing unit and an operation unit which are sequentially connected, the control module inputs a switching signal to the isolation unit, the guiding unit is used for inputting a constant signal to charge the charging unit, the switching signal and the constant signal form electric potentials at two ends of the charging unit, the electric potentials are subjected to voltage dividing treatment by the voltage dividing unit, and the operation unit is used for outputting the control signal to the resistance switch. In the scheme, the isolation unit is used for isolating and detecting signals, and the guide unit, the charging unit, the voltage dividing unit and the budget unit are used for converting and outputting the signals, so that the output control signals can be directly corresponding to logic levels and used for controlling the states of the resistance switches.
Further, the isolation unit includes a capacitor c4_1, and the charging unit includes a capacitor c4_2.
Further, the voltage dividing unit includes a voltage dividing resistor r4_1 and a voltage dividing resistor r4_2, one ends of the voltage dividing resistor r4_1 and the voltage dividing resistor r4_2, which are close, are voltage dividing nodes, and are used for outputting and connecting the operation unit, and the other ends of the voltage dividing resistor r4_1 and the voltage dividing resistor r4_2 are connected with two ends of the capacitor c4_2.
Further, the circuit further comprises a capacitor C4_3 and a resistor R4_3, the operation unit comprises a +IN end, -IN end and an output end, the capacitor C4_3 is connected with the-IN end and the output end of the operation unit, the +IN end and the output end are connected with the resistor R4_3, the +IN end is connected with the voltage division unit, and the output end of the operation unit is connected with the resistor switch.
Further, the control module is provided with a digital-to-analog conversion module, one end of the control module is connected with the control unit and used for outputting pulse signals, and the other end of the control module is connected with the digital-to-analog conversion module and used for outputting analog voltage signals to the feedback end.
Further, the voltage feedback module is further provided with a feedback resistor R2_1, one end of the feedback resistor R2_1 is connected with the resistor, the other end of the feedback resistor R2_1 is connected with the digital-to-analog conversion module, and/or the voltage feedback module further comprises a feedback resistor R2_2, one end of the feedback resistor R2_2 is connected with the parallel resistor, and the other end of the feedback resistor R2_2 is grounded.
The device comprises a switch control system, wherein a connection node of the voltage feedback module and the output end of the voltage stabilizing circuit is an output node, and the output node is used for connecting electric equipment.
Further, the electric equipment is a fan, one end of the fan is connected with the output node, and the other end of the fan is grounded.
Compared with the prior art, the utility model has the beneficial effects that:
in the utility model, the control module can realize the highest voltage limiting setting of the circuit in a software program mode so as to adapt to the working voltages of electric appliances with different specifications, and meanwhile, the anti-interference capability of the control circuit is improved.
Drawings
Fig. 1 is a block diagram of a voltage-limiting output control circuit according to the present utility model.
Fig. 2 is a block diagram of a control unit of a voltage-limiting output control circuit according to the present utility model.
Fig. 3 is a block diagram of a control unit of a voltage-limiting output control circuit according to the present utility model.
Fig. 4 is a circuit configuration diagram of a voltage-limiting output control circuit according to the present utility model.
Fig. 5 is a circuit configuration diagram of a control unit of a voltage-limiting output control circuit of the present utility model.
In the figure, a control unit 100, an isolation unit 110, a guiding unit 120, a charging unit 130, a voltage dividing unit 140, an operation unit 150, a voltage stabilizing module 200, a voltage feedback module 300, and a control module 400.
Detailed Description
In order that the utility model may be readily understood, a more complete description of the utility model will be rendered by reference to the appended drawings. Preferred embodiments of the present utility model are shown in the drawings. This utility model may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. For better illustration of the following embodiments, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Example 1
As shown in fig. 1-4, a voltage-limiting output control circuit includes a voltage stabilizing module 200, a voltage feedback module 300, and a control module 400, where the voltage stabilizing module 200 is connected to the voltage feedback module 300 and is used for receiving a voltage regulating signal of the voltage feedback module 300 to control and regulate an output voltage, the voltage feedback module 300 includes a plurality of resistors connected in parallel, the control module 400 is connected to the voltage feedback module 300 and is used for controlling a parallel resistance value of the voltage feedback module 300, the voltage feedback module 300 is provided with a resistance switch, the resistance switch is used for controlling a connection state between the plurality of resistors, the control module 400 is connected with the control unit 100, the other end of the control unit 100 is connected with the resistance switch and is used for controlling a state of the resistance switch, and the control unit 100 is used for selecting the state of the resistance switch to regulate the parallel resistance value of the plurality of resistors by detecting a switching signal sent by the control module 400. The present utility model further defines the output voltage (Vout) by inserting the software internal structure, where the present utility model performs coding control on the control module 400 to generate a switching signal, where the switching signal is the highest limit corresponding to Vout, after writing is developed to make the control module 400 generate the switching signal, the control unit 100 detects the switching signal, and when the corresponding switching signal is detected, the control unit 100 generates a corresponding control signal, such as a logic "1" or a logic "0", where the control signal corresponds to a resistor connection state connected in parallel later, that is, a resistor resistance value connected in parallel is controlled, and when the voltage stabilizing module 200 detects the resistor value of the voltage feedback unit at the feedback end, the present utility model outputs a corresponding voltage, which implements: the corresponding control signal is directly regenerated by generating the switching signal in the normal operation of the MCU, namely, the working voltage is normally and stably output to the subsequently connected equipment at the output end, and the output voltage can be regulated by setting the switching signal generated by the control module 400 in the mode, so that the flexibility is higher.
Preferably, the voltage stabilizing module 200 includes a feedback end, an input end, and an output end, one end of the control module 400 is output and connected with a resistance switch, for controlling the resistance value of the voltage feedback module 300, the other end of the control module 400 is output and connected with the feedback end, one end of the voltage feedback module 300 is connected with the output end, the other end of the voltage feedback module 300 is connected with the feedback end, the control module 400 is connected with the control unit 100, the other end of the control unit 100 is connected with the resistance switch, for controlling the state of the resistance switch, the control unit 100 is used for selecting the state of the resistance switch by detecting a switching signal sent by the control module 400 and outputting the control signal, so as to adjust the parallel resistance value of a plurality of resistors.
Preferably, the voltage stabilizing module 200 further includes a ground terminal.
Preferably, the voltage stabilizing module 200 is a BUCK-BOOST circuit or a BOOST-BOOST circuit.
As shown in fig. 2, preferably, the switching signal includes a pulse signal, the control unit 100 includes an isolation unit 110, and the isolation unit 110 includes at least one capacitor, and the non-pulse signal from the control module 400 is isolated by the capacitor. In the present utility model, when the control module 400 outputs uncertain signals, which are possibly in high level "1"/low level "0"/high resistance state, the common characteristic of the three states is that the three states are detected as constant states, and when the control module 400 further outputs a switching signal, the signal tends to fluctuate within a certain range, and according to the rule of the signal change, the present utility model adopts the capacitor to charge the switching signal and to isolate the constant states, so as to distinguish the input end states of the control module 400.
Further, the control unit 100 further includes a judging module, where the judging module is configured to convert the isolated pulse signal into a control signal. In the above scheme, the differentiated pulse signal may be directly output as a control signal in an ac state, or a signal conversion circuit may be further provided to normalize the output of the control signal and convert it into a simple logic level.
Preferably, the control unit 100 further includes an isolation unit 110, a guiding unit 120, a charging unit 130, a voltage dividing unit 140, and an operation unit 150, which are sequentially connected, the control module 400 inputs a pulse signal to the isolation unit 110, the guiding unit 120 is used for inputting a constant signal to charge the charging unit 130, the pulse signal and the constant signal form a potential at two ends of the charging unit 130, the potential is divided by the voltage dividing unit 140, and the operation unit 150 outputs a control signal to the resistance switch. In this scheme, the isolation unit 110 is used to isolate and detect signals, and the guiding unit 120, the charging unit 130, the voltage dividing unit 140 and the budget unit are used to output signals through conversion, so that the output control signals can be directly corresponding to logic level for controlling the state of the resistance switch.
Further, the isolation unit 110 includes a capacitor c4_1, and the charging unit 130 includes a capacitor c4_2.
Further, the guiding unit 120 includes a diode d4_1 and a diode d4_2, the output of the capacitor c4_1 is connected to the anode of the diode d4_1, the output of the capacitor c4_1 is connected to the cathode of the capacitor c4_2, the first power output is connected to the anode of the capacitor c4_2, the cathode of the diode d4_1 is connected to the capacitor c4_2, and the output of the capacitor c4_2 is connected to the voltage dividing unit 140.
Specifically, 3.3V of the first power supply.
Further, one end of the capacitor c4_2 is grounded.
Preferably, the voltage dividing unit 140 includes a voltage dividing resistor r4_1 and a voltage dividing resistor r4_2, wherein one ends of the voltage dividing resistor r4_1 and the voltage dividing resistor r4_2, which are close, are voltage dividing nodes, and are used for outputting and connecting the operation unit 150, and the other ends of the voltage dividing resistor r4_1 and the voltage dividing resistor r4_2 are respectively connected with two ends of the capacitor c4_2.
Specifically, the resistor r4_1 is 1mΩ, and the resistor r4_2 is 5.1mΩ.
Further, the operation unit 150 is provided with a capacitor c4_3 and a resistor r4_3, the operation unit 150 includes a v+ end, a V-end, -IN end, +in end and an output end, the capacitor c4_3 is connected to the V-end and the output end of the operation unit 150, the resistor r4_3 is connected to the v+ end and the output end, -IN end is connected to the voltage division unit 140, the +in end is connected to a 3.3V power supply, the V-end and the v+ end are connected to a 5V power supply, and the output end of the operation unit 150 is connected to a resistor switch.
Specifically, the operation unit 150 sets the comparator U4_1 to-IN > + IN for the comparator U4_1.
Further, the control module 400 is provided with a digital-to-analog conversion module, one end of the control module 400 is connected with the control unit 100 for outputting a switching signal, and the other end of the control module 400 is connected with the digital-to-analog conversion module for outputting an analog voltage signal to the feedback end.
Further, the voltage feedback module 300 is further provided with a feedback resistor r2_1, one end of the feedback resistor r2_1 is connected with the resistor, the other end of the feedback resistor r2_1 is connected with the digital-to-analog conversion module, and/or the voltage feedback module 300 further comprises a feedback resistor r2_2, one end of the feedback resistor r2_2 is connected with the parallel resistor, and the other end of the feedback resistor r2_2 is grounded.
Specifically, the control module 400 includes an IO port, the resistance switches are MOS transistors Q1 to Qn, the IO port is connected to the plurality of control units 100, the n control units 100 are respectively and correspondingly connected to gates of the n MOS transistors, and drains and sources of the n MOS transistors are respectively and correspondingly connected to two ends of the n resistors in parallel.
As shown in fig. 5, further, a resistor R1 is provided, one end of the resistor R1 is connected to the output end of the voltage stabilizing module 200, the other end is connected to the feedback end, and the resistors R2 to rn+1 correspond to the parallel MOS transistors Q1 to Qn and the n control units 100, respectively.
The voltage limiting output control device comprises a switch control system, wherein a node of an output end of a voltage feedback module 300 and a voltage stabilizing circuit is an output node, and the output node is connected with electric equipment and is used for providing proper working voltage to the electric equipment.
Further, the electric equipment is a fan, one end of the fan is connected with the output node, and the other end of the fan is grounded.
Based on the voltage limiting output control circuit and the device, the following can be obtained:
voltage V output by voltage stabilizing module 200 OUT Under the control of the voltage feedback module 300, the calculation formula is as follows according to the KCL (kirchhoff current law) column equation:
V FB -constant, voltage at the feedback terminal;
V DAC the value is 0 to V CC (V CC Typically 3.3V) corresponding to the analog voltage output by the digital-to-analog conversion module;
r1// R2// R3 …// Rn- - -is the upper feedback resistor parallel value in the voltage feedback module 300;
r2_1 and R2_2 are feedback resistors, and are constant after being selected.
As can be seen from the above formula, after R2_1 and R2_2 are selected, V can be realized by only changing the resistance value of (R1// R2// R3.// Rn) OUT And (3) controlling the output voltage.
From the formula, when V DAC When the output voltage is 0V, the output voltage is maximum, and at this time, only the on and off of the switch control unit 100 needs to be controlled, so that the (R1// R2// R3.// Rn) can take the required value, so that V OUT Is limited below a certain voltage range. Such as: when in use, the rated voltage of the fan is 12V, the voltage V can be limited OUT The output MAX is about 12.5V-13V; the rated voltage of the fan is 24V when in use, and the voltage V can be limited OUT The output MAX is about 24.5V-25V.
Wherein, the resistance switches Q1 to Qn are correspondingly controlled to be opened or shorted in parallel state of R2 to rn+1, and the on or off of the resistance switches is controlled by the logic level output by the control unit 100 in the operation based on the above formula;
analysis of the control unit 100 may yield:
a. when the output level of the input end MCU I/O is IN a high level "1"/low level "0"/high impedance state, any one of the states has no influence on the output end due to isolation of the capacitor c4_1, meanwhile, the 3.3V power supply IN the guiding unit 120 charges the c4_2 through d4_2/d4_1, the output voltage thereof is about 3.3-0.3x2=2.7v (where the diode voltage drops to 0.3V), after passing through the voltage dividing network of r4_1 and r4_2, the voltage at the-IN end of the operational amplifier (or comparator) u4_1 is about 3V, the voltage thereof is less than the power supply 3.3V at the +in end, and according to the characteristics of the operational amplifier, the output is at the high level, the feedback end voltage IN the circuit is 5V, that is, the output is not influenced by the input, and the rated voltage output at the Vout end is 12V; namely: as shown in fig. 5, when the control unit 100 does not receive the input of the control module 400MCU I/O pulse-free waveform, the voltages at the two ends of c4_2 are 2.907v, the output voltage of u4_1out is 4.946v, and the output voltage of vout_max is 12.94V, so as to meet the output requirement of the designed voltage limit of 12.5V-13.0V;
b. only when there is a continuous pulse on the input MCU I/O, when a low level "0" is input, 3.3V charges c4_1 through d4_2, and after c4_1 is fully charged, the left end is about 3.0V (here, the diode drop is 0.3V), and the right end is 0V;
c. when a high level '1' is input to the MCU I/O in the next stage, the left end of the C4_1 is raised to 6.3V due to the fact that the voltage at the two ends of the capacitor cannot be suddenly changed, the voltage charges the diode C4_2 through the D4_1, and finally the C4_2 is charged to 6.0V (6.3V-0.3V diode voltage drop), namely when the continuous pulse is input, the voltage of about 5.8-6V is generated in the capacitor C4_2; d. the voltage of 6V forms a resistor voltage division network through R4_1 and R4_2, a proper resistance value (such as R4_1=1MΩ, R4_2=5.1MΩ) is taken, about 5.0V voltage is obtained after voltage division and is input to the-IN end of an operational amplifier (or a comparator), the +IN end of the operational amplifier is connected with 3.3V, the +IN is provided with-IN > +IN, and the operational amplifier outputs low level 0V according to the characteristic of the operational amplifier; that is, as shown in fig. 5, when the MCU I/O has a pulse waveform input, the control unit 100 outputs the voltage at both ends of c4_2 of 5.912V, the voltage at u4_1out of 52.09Mv (about equal to 0V), vout_max outputs the voltage limit of 24.63V, and meets the designed voltage limit of 24.5V to 25.0V output requirements;
e. in summary, the control unit 100 implements the output of the control signal by detecting the MCU I/O pulse.
The output end of the u4_1 is connected with the grid electrode of the MOS tube in the voltage feedback module 300 in a direction combining with the output of the control signal, when the output of the u4_1 is 1, the MOS tube is turned on, otherwise, when the output of the u4_1 is 0, the MOS tube is turned off, and the upper end resistance value in the voltage feedback module 300 is changed through the on and the off of the MOS tube, so that the MAX value of the output voltage of the voltage stabilizing module 200 is changed.
Compared with the prior art, the utility model has the beneficial effects that:
in the utility model, the control module 400 can realize the highest voltage limiting setting of the circuit in a software program mode so as to adapt to the working voltages of electric appliances with different specifications, and meanwhile, the anti-interference capability of the control circuit is improved, and the utility model has the characteristics of strong anti-interference capability, high reliability and good applicability.
It should be understood that the foregoing examples of the present utility model are merely illustrative of the present utility model and are not intended to limit the present utility model to the specific embodiments thereof. Any modification, equivalent replacement, improvement, etc. that comes within the spirit and principle of the claims of the present utility model should be included in the protection scope of the claims of the present utility model.
Claims (10)
1. The voltage limiting output control circuit is characterized by comprising a voltage stabilizing module, a voltage feedback module and a control module, wherein the voltage stabilizing module is connected with the voltage feedback module and used for receiving a voltage regulating signal of the voltage feedback module to regulate output voltage, the voltage feedback module comprises a plurality of resistors connected in parallel, the control module is connected with the voltage feedback module and used for controlling the parallel resistance value of the voltage feedback module, the voltage feedback module is provided with a resistance switch which is used for controlling the connection state among a plurality of resistors, the control module is connected with a control unit, the other end of the control unit is connected with the resistance switch and used for controlling the state of the resistance switch, the control unit is used for selecting the state of the resistance switch and outputting a control signal through detecting a switch signal sent by the control module so as to regulate the parallel resistance value of a plurality of resistors.
2. The voltage-limiting output control circuit of claim 1, wherein the voltage stabilizing module is provided with a ground terminal.
3. The voltage-limiting output control circuit according to claim 1, wherein the voltage stabilizing module comprises a feedback end, an input end and an output end, one end of the control module is output and connected with the resistance switch for controlling the resistance value of the voltage feedback module, the other end of the control module is output and connected with the feedback end, one end of the voltage feedback module is connected with the output end, and the other end of the voltage feedback module is connected with the feedback end.
4. A voltage-limited output control circuit according to claim 3, wherein the switching signal is a pulse signal, the control unit comprises an isolation unit comprising at least one capacitor for isolating the non-pulse signal from the control module.
5. The voltage-limited output control circuit of claim 4, wherein the control unit further comprises a judgment module for converting the isolated pulse signal into the control signal.
6. The voltage-limiting output control circuit according to claim 1, wherein the control module is provided with a digital-to-analog conversion module, one end of the control module is connected with the control unit for outputting the switching signal, and the other end of the control module is connected with the digital-to-analog conversion module for outputting the analog voltage signal to the feedback end.
7. The voltage-limiting output control circuit according to claim 6, wherein the voltage feedback module is further provided with a feedback resistor r2_1, one end of the feedback resistor r2_1 is connected with a resistor, the other end of the feedback resistor r2_1 is connected with the digital-to-analog conversion module, and/or the voltage feedback module is further provided with a feedback resistor r2_2, one end of the feedback resistor r2_2 is connected with a resistor in parallel, and the other end of the feedback resistor r2_2 is grounded.
8. The voltage-limiting output control circuit according to claim 4 or 5, wherein the control unit further comprises an isolation unit, a guide unit, a charging unit, a voltage dividing unit and an operation unit which are sequentially connected, the control module inputs a pulse signal to the isolation unit, the guide unit is used for inputting a constant signal to charge the charging unit, the pulse signal and the constant signal form electric potentials at two ends of the charging unit, the electric potentials are subjected to voltage dividing treatment by the voltage dividing unit, and the operation unit is used for outputting the control signal to the resistance switch.
9. A voltage limiting output control device, the device comprising a switch control system according to any one of claims 2-8, wherein a connection node between the voltage feedback module and the output terminal of the voltage stabilizing circuit is an output node, and the output node is used for connecting with electrical equipment.
10. The voltage-limiting output control device according to claim 9, wherein the electric device is a fan, one end of the fan is connected to the output node, and the other end of the fan is grounded.
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