CN113765464A - Voltage conversion device, motor control system and air conditioner - Google Patents
Voltage conversion device, motor control system and air conditioner Download PDFInfo
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- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
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Abstract
The invention provides a voltage conversion device, a motor control system and an air conditioner. Wherein, voltage conversion device is connected with the controller, and the controller outputs first voltage signal, and voltage conversion device includes: a voltage output circuit outputting a second voltage signal; and the comparison circuit is connected with the controller and the voltage output circuit and compares the first voltage signal with the second voltage signal to obtain a pulse width modulation signal. The voltage conversion device can convert the voltage of 0V to 10V output by the controller into a pulse width modulation signal so as to be suitable for the control of the motor. The technical scheme of the invention can solve the problem of insufficient matching compatibility of the 0V-10V motor controller and the conventional motor, and ensure the control universality.
Description
Technical Field
The invention relates to the technical field of motors, in particular to a voltage conversion device, a motor control system and an air conditioner.
Background
At present, the common control method of the motor in the air conditioner includes: PWM speed regulation control, 0V to 10V voltage speed regulation control and the like. The voltage regulation from 0V to 10V can directly use a universal controller, and is concerned about because of simple control mode, but the defects are that the cost of the corresponding motor is high, the compatibility is poor, and only the motor which is matched with the special 0V to 10V can be limited.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, an aspect of the present invention is to provide a voltage conversion apparatus.
Another aspect of the present invention is to provide a motor control system.
Yet another aspect of the present invention is to provide an air conditioner.
In view of the above, according to one aspect of the present invention, there is provided a voltage converting apparatus, the voltage converting apparatus is connected to a controller, the controller outputs a first voltage signal, and the voltage converting apparatus includes: a voltage output circuit outputting a second voltage signal; and the comparison circuit is connected with the controller and the voltage output circuit and compares the first voltage signal with the second voltage signal to obtain a pulse width modulation signal.
In the technical scheme, the controller outputs a first voltage signal, the numerical range of the first voltage signal is 0V to 10V, the voltage conversion device can convert the voltage of 0V to 10V into a pulse width modulation signal, and the pulse width modulation signal is 3.3V or 5V and is suitable for controlling the motor. Specifically, the voltage conversion apparatus includes a voltage output circuit and a comparison circuit that compares a first voltage signal with a second voltage signal of the voltage output circuit to output a pulse width modulation signal. The technical scheme of the invention can solve the problem of insufficient matching compatibility of the 0V-10V motor controller and the conventional motor, and ensure the control universality.
According to the voltage conversion device of the present invention, the following technical features may be provided:
in the above technical solution, the voltage output circuit includes: a first comparator; one end of the first capacitor is connected with the inverting input end and the power supply end of the first comparator, and the other end of the first capacitor is grounded; one end of the first resistor is connected with the power supply end, and the other end of the first resistor is connected with the inverting input end of the first comparator and the first capacitor; and the second resistor is connected between the inverting input end of the first comparator and the output end of the first comparator, wherein the voltage output circuit alternately works between a first working stage and a second working stage, the voltage of the inverting input end of the first comparator is used as a second voltage signal, the first working stage is that the power supply end charges the first capacitor through the first resistor, so that the voltage of the output end of the first comparator is converted into a low level from the third voltage signal, and the second working stage is that the first capacitor discharges through the second resistor, so that the voltage of the output end of the first comparator is converted into the third voltage signal from the low level.
In this technical solution, the first operation stage of the voltage output circuit includes: when the voltage of the inverting input end of the first comparator is 0, the voltage of the non-inverting input end of the first comparator and the voltage of the output end of the first comparator are both third voltage signals, the power supply end charges the first capacitor through the first resistor, and the voltage of the output end of the first comparator is converted into low level from the third voltage signals until the voltage of the inverting input end of the first comparator is greater than the third voltage signals; the second operation phase of the voltage output circuit comprises: when the voltage of the output end of the first comparator is at a low level, the voltage of the non-inverting input end of the first comparator is a fourth voltage signal, the voltage of the inverting input end of the first comparator is a second voltage signal, the first capacitor discharges through the second resistor until the second voltage signal is smaller than the fourth voltage signal, the voltage of the output end of the first comparator is converted into a third voltage signal from the low level, and the voltage of the non-inverting input end of the first comparator is recovered into the third voltage signal. And repeating the first working stage and the second working stage, and forming a similar sawtooth wave (namely a second voltage signal) at the inverting input end of the first comparator, so that the second voltage signal can be compared with the voltage from 0V to 10V to obtain a pulse width modulation signal, and the matching of the controller from 0V to 10V and the alternating current/direct current motor is realized.
In any of the above technical solutions, the voltage output circuit further includes: one end of the third resistor is grounded, and the other end of the third resistor is connected with the non-inverting input end of the first comparator; the fourth resistor is connected between the power supply end and the non-inverting input end of the first comparator; and the fifth resistor is connected between the non-inverting input end of the first comparator and the output end of the first comparator.
In this technical solution, when the voltage at the inverting input terminal of the first comparator is 0, the voltage at the non-inverting input terminal of the first comparator and the voltage at the output terminal of the first comparator are both the voltage division (i.e., the third voltage signal) of the third resistor and the fourth resistor on the power supply terminal. After the voltage at the output end of the first comparator is at a low level, the voltage at the output end of the first comparator is a voltage divided by the third resistor and the fifth resistor after being connected in parallel and the fourth resistor to the power supply end (i.e., a fourth voltage signal).
In any of the above technical solutions, the voltage output circuit further includes: and the anode of the diode is connected with the second resistor, and the cathode of the diode is connected with the output end of the first comparator.
In the technical scheme, the anode of the diode is connected with the second resistor, and the cathode of the diode is connected with the output end of the first comparator, namely the diode is connected between the inverted input end of the first comparator and the output end of the first comparator, so that the damage of reverse voltage to the first comparator is avoided.
In any of the above technical solutions, the comparison circuit includes: the non-inverting input end of the second comparator is connected with the inverting input end of the first comparator, and the inverting input end of the second comparator is connected with the controller; the opto-coupler circuit, the output of second comparator is all connected to the first input of opto-coupler circuit and the second input of opto-coupler circuit, and it has the feeder ear to connect between the first input of opto-coupler circuit and the output of second comparator, wherein, when first voltage signal is greater than second voltage signal, the output of second comparator is the low level, the opto-coupler circuit switches on, the output of opto-coupler circuit is the low level, when first voltage signal is less than second voltage signal, the output of second comparator is the high level, the opto-coupler circuit ends, the output of opto-coupler circuit is the high level, so that the output pulse width modulation signal of opto-coupler circuit.
In the technical scheme, a sawtooth wave and a 0V to 10V signal U are formed through the inverting input end of a first comparatorinputComparing, when the sawtooth voltage is lower than UinputWhen the output end of the second comparator is at a low level, since a power supply end (the power supply end can be 15V) is connected between the first input end of the optical coupling circuit and the output end of the second comparator, the optical coupling circuit is switched on, and the output end of the optical coupling circuit is at the low level; when the sawtooth voltage is higher than UinputWhen the output end of the second comparator is at a high level, because a power supply end (the power supply end can be 15V) is connected between the first input end of the optical coupling circuit and the output end of the second comparator, the optical coupling circuit is cut off, the output end of the optical coupling circuit is at the high level, and therefore the output end of the optical coupling circuit outputs a waveform (namely a pulse width modulation signal) with a specific duty ratio. Furthermore, the voltage of the corresponding 0V to 10V signal can be calculated by judging the duty ratio of the high level and the low level, and the detection of the 0V to 10V input voltage is completed.
In any of the above technical solutions, the comparison circuit further includes: the sixth resistor is connected between the output end of the second comparator and the first input end of the optical coupler circuit; and the seventh resistor is connected between the output end of the second comparator and the second input end of the optical coupler circuit.
In the technical scheme, the sixth resistor is connected between the output end and the first input end of the second comparator, the seventh resistor is connected between the output end and the second input end of the second comparator, and the sixth resistor and the seventh resistor both play a role in current limiting, so that the pulse width modulation signal output by the comparison circuit is more accurate.
In any of the above technical solutions, the comparison circuit further includes: an eighth resistor; the eighth resistor and the second capacitor are connected in parallel to form a parallel circuit, the first end of the parallel circuit is connected with the inverting input end of the second comparator, and the second end of the parallel circuit is grounded; a ninth resistor connected between the parallel circuit and the inverting input terminal of the second comparator; and the tenth resistor is connected between the non-inverting input end of the second comparator and the output end of the second comparator.
In the technical scheme, a parallel circuit formed by an eighth resistor and a second capacitor is connected between the inverting input end of the second comparator and the ground end, a ninth resistor is connected between the parallel circuit and the inverting input end of the second comparator, and a tenth resistor is connected between the non-inverting input end of the second comparator and the output end of the second comparator. The eighth resistor plays a role in filtering, the ninth resistor and the tenth resistor play a role in limiting current, and the second capacitor plays a role in filtering, so that the pulse width modulation signal output by the comparison circuit is more accurate.
In any one of the above technical solutions, the output terminal of the optical coupling circuit includes a first output terminal and a second output terminal, the second output terminal is grounded, and the comparison circuit further includes: the eleventh resistor is connected between the first output end and the power supply end; the twelfth resistor is connected with the first output end; and one end of the third capacitor is connected with the first output end, and the other end of the third capacitor is grounded.
In the technical scheme, an eleventh resistor is connected between the first output end of the optical coupling circuit and the power supply end, one end of a twelfth resistor is connected with the first output end of the optical coupling circuit, the other end of the twelfth resistor can be connected with a processor, the processor can receive a pulse width modulation signal, and a third capacitor is connected between the first output end and the ground end. The eleventh resistor and the twelfth resistor both play a role in current limiting, and the third capacitor plays a role in filtering, so that the pulse width modulation signal output by the comparison circuit is more accurate.
In any of the above technical solutions, the method further includes: and the thirteenth resistor is connected between the voltage output circuit and the comparison circuit.
In the technical scheme, the thirteenth resistor is connected between the voltage output circuit and the comparison circuit and plays a role in limiting the current.
According to another aspect of the present invention, there is provided a motor control system including: the controller outputs a first voltage signal; the voltage conversion device according to any one of the above technical solutions is connected to the controller, and converts the first voltage signal into a pulse width modulation signal; and the processor is connected with the voltage conversion device, outputs a control signal according to the pulse width modulation signal and controls the motor according to the control signal.
In the technical scheme, the motor control system comprises a controller, a voltage conversion device and a processor, wherein the controller outputs a first voltage signal of 0V to 10V, the voltage conversion device converts the first voltage signal into a pulse width modulation signal, and the processor outputs a control signal according to the pulse width modulation signal so as to control the motor. The technical scheme of the invention can solve the problem of insufficient matching compatibility of the 0V-10V motor controller and the conventional motor, and ensure the control universality.
According to another aspect of the present invention, there is provided an air conditioner including: a voltage conversion device according to any one of the above embodiments; or a motor control system according to any of the above-mentioned solutions.
In this embodiment, the air conditioner includes the voltage conversion device according to any one of the above-described embodiments or the motor control system according to any one of the above-described embodiments, and therefore all advantageous technical effects of the voltage conversion device or the motor control system can be achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 shows a schematic block diagram of a voltage conversion apparatus of a first embodiment of the present invention;
fig. 2 shows a circuit diagram of a voltage conversion device of a second embodiment of the present invention;
FIG. 3 shows waveforms of the inverting input of the first comparator, the output of the first comparator and the output of the comparison circuit according to an embodiment of the invention;
fig. 4 shows a schematic block diagram of a motor control system of the first embodiment of the present invention;
FIG. 5 illustrates a schematic diagram of the operation of a motor control system of an embodiment of the present invention;
fig. 6 shows a circuit diagram of a motor control system of a second embodiment of the present invention.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments of the present invention and features of the embodiments may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited to the specific embodiments disclosed below.
An embodiment of the first aspect of the present invention provides a voltage conversion apparatus, where the voltage conversion apparatus is connected to a controller, and the controller outputs a first voltage signal. Fig. 1 shows a schematic block diagram of a voltage conversion apparatus 100 of a first embodiment of the present invention. The voltage conversion apparatus 100 includes:
a voltage output circuit 102, wherein the voltage output circuit 102 outputs a second voltage signal;
and the comparison circuit 104 is connected with the controller and voltage output circuit 102, and the comparison circuit 104 compares the first voltage signal with the second voltage signal to obtain a pulse width modulation signal.
In this embodiment, the controller outputs a first voltage signal, the value range of the first voltage signal is 0V to 10V, and the voltage conversion device can convert the voltage of 0V to 10V into a pulse width modulation signal, and the pulse width modulation signal is 3.3V or 5V, so as to be suitable for controlling the motor. Specifically, the voltage conversion apparatus includes a voltage output circuit 102 and a comparison circuit 104, and the comparison circuit 104 compares a first voltage signal with a second voltage signal of the voltage output circuit 102 to output a pulse width modulation signal. The embodiment of the invention can solve the problem that the compatibility of the 0V-10V motor controller and the conventional motor is insufficient, and ensure the universality of control.
Fig. 2 shows a circuit diagram of a voltage conversion device of a second embodiment of the present invention. Wherein, voltage conversion device is connected with 0V to 10V signal input, and the voltage conversion device includes:
a voltage output circuit 202, the voltage output circuit 202 outputting a second voltage signal;
the comparator circuit 204 is connected to the 0V to 10V signal input and voltage output circuit 202, and the comparator circuit 204 compares the first voltage signal with the second voltage signal to obtain a pulse width modulation signal.
The voltage output circuit 202 includes:
a first comparator U1;
one end of a first capacitor C1, one end of a first capacitor C1 is connected with the inverting input end and the power supply end VCC of the first comparator U1, and the other end of the first capacitor C1 is connected with the ground end GND;
one end of a first resistor R1, one end of a first resistor R1 is connected with a power supply terminal VCC, and the other end of the first resistor R1 is connected with an inverting input terminal of a first comparator U1 and a first capacitor C1;
a second resistor R2, the second resistor R2 being connected between the inverting input terminal of the first comparator U1 and the output terminal of the first comparator U1;
a third resistor R3, the third resistor R3 being connected between the ground GND and the non-inverting input terminal of the first comparator U1;
the fourth resistor R4, the fourth resistor R4 is connected between the power supply terminal VCC and the non-inverting input terminal of the first comparator U1;
a fifth resistor R5, the fifth resistor R5 is connected between the non-inverting input terminal of the first comparator U1 and the output terminal of the first comparator U1;
and the anode of the diode D is connected with the second resistor R2, and the cathode of the diode D is connected with the output end of the first comparator U1.
The comparison circuit 204 includes:
a non-inverting input terminal of the second comparator U2 is connected with an inverting input terminal of the first comparator U1, and an inverting input terminal of the second comparator U2 is connected with the controller;
the first input end of the optical coupling circuit IC and the second input end of the optical coupling circuit IC are both connected with the output end of a second comparator U2, and a power supply end VCC is connected between the first input end of the optical coupling circuit IC and the output end of a second comparator U2;
a sixth resistor R6, the sixth resistor R6 being connected between the output terminal of the second comparator U2 and the first input terminal of the opto-coupler circuit IC;
the seventh resistor R7 is connected between the output end of the second comparator U2 and the second input end of the optical coupling circuit IC, and the seventh resistor R7 is connected between the output end of the second comparator U2 and the second input end of the optical coupling circuit IC;
an eighth resistor R8;
the second capacitor C2, the eighth resistor R8 and the second capacitor C2 are connected in parallel to form a parallel circuit, the first end of the parallel circuit is connected with the inverting input end of the second comparator U2, and the second end of the parallel circuit is grounded;
a ninth resistor R9, the ninth resistor R9 being connected between the parallel circuit and the inverting input terminal of the second comparator U2;
a tenth resistor R10, the tenth resistor R10 being connected between the non-inverting input of the second comparator U2 and the output of the second comparator U2;
the eleventh resistor R11 and the eleventh resistor R11 are connected between the first output end and the power supply end VCC of the optical coupling circuit IC, the output end of the optical coupling circuit IC comprises a first output end and a second output end, and the second output end of the optical coupling circuit IC is grounded;
the twelfth resistor R12 is connected with the first output end of the optical coupling circuit IC through the twelfth resistor R12;
one end of a third capacitor C3, one end of a third capacitor C3 is connected with the first output end of the optocoupler circuit IC, and the other end of the third capacitor C3 is connected with the ground end GND.
The voltage conversion apparatus further includes:
a thirteenth resistor R13, a thirteenth resistor R13 is connected between the voltage output circuit and the comparison circuit.
The voltage output circuit 202 includes two operating phases: the voltage output circuit 202 alternately operates between the first operating phase and the second operating phase, and uses the voltage generated at the inverting input terminal of the first comparator U1 during operation as the second voltage signal. The comparator circuit 204 compares the second voltage signal with the first voltage signal of 0V to 10V, and outputs a waveform (i.e., a pulse width modulation signal) having a specific duty ratio.
In the first working phase of the voltage output circuit 202, the first capacitor C1 is charged, and the level of the output terminal of the first comparator U1 is inverted:
initially, the input voltage at the inverting input terminal of the first comparator U1 is 0, the voltage at the non-inverting input terminal of the first comparator U1 and the voltage at the output terminal of the first comparator U1 are the voltage V divided by the third resistor R3 and the fourth resistor R4 to the power supply terminal VCCIn phase(ii) a As the power supply terminal VCC charges the first capacitor C1 through the first resistor R1, the voltage at the inverting input terminal of the first comparator U1 continuously rises until the voltage at the inverting input terminal of the first comparator U1 is higher than the voltage at the non-inverting input terminal of the first comparator U1, the output terminal of the first comparator U1 outputs a low level, and the voltage at the inverting input terminal of the first comparator U1 is V at this timeInverse phase。
In the second operation stage of the voltage output circuit 202, the first capacitor C1 discharges rapidly, and the level of the output terminal of the first comparator U1 flips again:
after the output of the first comparator U1 flips low,the voltage value of the non-inverting input terminal of the first comparator U1 is the divided voltage V of the third resistor R3 connected in parallel with the fifth resistor R5 and the fourth resistor R4 to the power supply terminal VCCIn phase’，VIn phase' less than V of the first working phaseIn phaseThe first capacitor C1 is discharged through the second resistor R2 until VInverse phaseLess than VIn phase', the output end level of the first comparator U1 is inverted and restored to VIn phaseThe voltage at the non-inverting input of the first comparator U1 also returns to VIn phaseThe power supply terminal VCC charges the first capacitor C1 again through the first resistor R1. The first comparator U1 repeats the first operation phase and the second operation phase through the continuous charging and discharging of the first capacitor C1, and a similar sawtooth wave (i.e., a second voltage signal) is formed at the inverting input terminal of the first comparator U1.
Finally, comparing the sawtooth wave with the first voltage signal to output a specific duty cycle waveform (i.e. a pulse width modulation signal):
the sawtooth wave formed by the inverting input terminal of the first comparator U1 in the first two working phases and the voltage U inputted by the signal from 0V to 10VinputComparing, when the sawtooth voltage is lower than UinputWhen the output end of the second comparator U2 outputs a low level, the optical coupling circuit IC is turned on, and the voltage U at the output end of the comparison circuit 204 is highoutputIs low level; when the sawtooth voltage is higher than UinputWhen the output end of the second comparator U2 outputs a high level, the optical coupling circuit IC is turned off, and the voltage U at the output end of the comparison circuit 204 is highoutputThe voltage is high level, so that the corresponding voltage U input by the 0V to 10V signal can be calculated by judging the duty ratio of the high level and the low levelinputAnd completing the detection of the input voltage of 0V to 10V.
FIG. 3 shows waveforms of an embodiment of the present invention, in which the waveform of the voltage (i.e. the second voltage signal) at the inverting input of the first comparator U1 is a sawtooth waveform, as shown in waveform A, the waveform of the voltage at the output of the first comparator U1 is shown in waveform B, and the voltage at the output of the comparison circuit 204 is shown in waveform UoutputThe voltage waveform of (2) is shown as waveform C.
The motor controller has the advantages of simple circuit, high reliability, low cost and convenience in popularization, the problem of universality of the motor controller in the market can be solved, the driving capability of the motor and the universality of motor control can be improved, the number of market accessories can be reduced due to enhanced compatibility, and the cost is reduced.
In a second aspect of the present invention, a motor control system is provided, and fig. 4 shows a schematic block diagram of a motor control system 300 according to a first embodiment of the present invention. Wherein, this motor control system 300 includes:
a controller 302, the controller 302 outputting a first voltage signal;
the voltage conversion device 304 according to any of the above embodiments is connected to the controller 302, and the voltage conversion device 304 converts the first voltage signal into a pulse width modulation signal;
and a processor 306 connected to the voltage conversion device 304, wherein the processor 306 outputs a control signal according to the pulse width modulation signal and controls the motor according to the control signal.
In this embodiment, the motor control system includes a controller 302, a voltage conversion device 304, and a processor 306. The motor control system 300 operates as shown in fig. 5, wherein the controller 302 outputs a voltage signal of 0V to 10V, the voltage conversion device 304 serves as an adapter board to isolate the front and rear ends, receives the voltage signal of 0V to 10V, and outputs a PWM (pulse width modulation) signal, and the processor 306 (i.e., the main MCU) outputs a motor driving signal according to the PWM signal to perform motor driving control. The embodiment of the invention can solve the problem that the compatibility of the 0V-10V motor controller and the conventional motor is insufficient, and ensure the universality of control.
After the processor 306 detects the signal of the controller 302, it outputs a motor control signal to control the motor, and drives the motor by dividing different gears according to the detected signal. For example, the wind level is divided into 7 gears, and the output voltage of the controller 302 and the output windshield controlled by the processor 306 correspond to each other as shown in table 1.
TABLE 1
Fig. 6 shows a circuit diagram of a motor control system of a second embodiment of the present invention. Wherein, this motor control system includes:
the controller 402 outputs 0V to 10V signal inputs.
The voltage conversion device 404, components included in the voltage conversion device 404, and connection relationships of the components are shown in fig. 2, which is not described again, and the voltage conversion device 404 converts the 0V to 10V signals into the PWM signals.
And a processor 406 for outputting a motor driving signal according to the PWM signal.
The motor 408 operates according to the motor drive signal.
The embodiment of the invention can enhance the control universality of the motor and solve the problems of various controllers, various motors and mutual mismatching in the market. After the compatibility is increased, the market can purchase the controller at will, and can select a more generalized and lower-cost scheme, thereby reducing the system scheme cost and the after-sale cost.
An embodiment of a third aspect of the present invention provides an air conditioner, including: a voltage conversion device as in any of the above embodiments; or a motor control system as in any of the embodiments described above.
In this embodiment, the air conditioner includes the voltage conversion device according to any one of the above-described embodiments, or the motor control system according to any one of the above-described embodiments, and thus all advantageous technical effects of the voltage conversion device or the motor control system can be achieved.
In the description herein, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance unless explicitly stated or limited otherwise; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A voltage conversion device, wherein the voltage conversion device is connected to a controller, the controller outputting a first voltage signal, the voltage conversion device comprising:
a voltage output circuit that outputs a second voltage signal;
and the comparison circuit is connected with the controller and the voltage output circuit and compares the first voltage signal with the second voltage signal to obtain a pulse width modulation signal.
2. The voltage conversion device of claim 1, wherein the voltage output circuit comprises:
a first comparator;
one end of the first capacitor is connected with the inverting input end and the power supply end of the first comparator, and the other end of the first capacitor is grounded;
one end of the first resistor is connected with the power supply end, and the other end of the first resistor is connected with the inverted input end of the first comparator and the first capacitor;
a second resistor connected between the inverting input terminal of the first comparator and the output terminal of the first comparator,
the voltage output circuit alternately works between a first working phase and a second working phase, and uses the voltage of the inverting input end of the first comparator as the second voltage signal, the first working phase is that the power supply end charges the first capacitor through the first resistor, so that the voltage of the output end of the first comparator is converted into a low level from a third voltage signal, and the second working phase is that the first capacitor discharges through the second resistor, so that the voltage of the output end of the first comparator is converted into the third voltage signal from the low level.
3. The voltage conversion device of claim 2, wherein the voltage output circuit further comprises:
one end of the third resistor is grounded, and the other end of the third resistor is connected with the non-inverting input end of the first comparator;
a fourth resistor connected between the supply terminal and a non-inverting input terminal of the first comparator;
a fifth resistor connected between the non-inverting input of the first comparator and the output of the first comparator.
4. The voltage conversion device of claim 2, wherein the voltage output circuit further comprises:
and the anode of the diode is connected with the second resistor, and the cathode of the diode is connected with the output end of the first comparator.
5. The voltage conversion device according to any one of claims 2 to 4, wherein the comparison circuit includes:
the non-inverting input end of the second comparator is connected with the inverting input end of the first comparator, and the inverting input end of the second comparator is connected with the controller;
the first input end of the optical coupling circuit and the second input end of the optical coupling circuit are both connected with the output end of the second comparator, and a power supply end is connected between the first input end of the optical coupling circuit and the output end of the second comparator,
the output end of the second comparator is at a low level, the optical coupling circuit is switched on, the output end of the optical coupling circuit is at a low level, the first voltage signal is smaller than the second voltage signal, the output end of the second comparator is at a high level, the optical coupling circuit is switched off, and the output end of the optical coupling circuit is at a high level, so that the output end of the optical coupling circuit outputs the pulse width modulation signal.
6. The voltage conversion device of claim 5, wherein the comparison circuit further comprises:
a sixth resistor connected between the output of the second comparator and the first input of the opto-coupler circuit;
and the seventh resistor is connected between the output end of the second comparator and the second input end of the optical coupler circuit.
7. The voltage conversion device of claim 5, wherein the comparison circuit further comprises:
an eighth resistor;
the eighth resistor and the second capacitor are connected in parallel to form a parallel circuit, the first end of the parallel circuit is connected with the inverting input end of the second comparator, and the second end of the parallel circuit is grounded;
a ninth resistor connected between the parallel circuit and the inverting input of the second comparator;
a tenth resistor connected between the non-inverting input of the second comparator and the output of the second comparator.
8. The voltage conversion device of claim 5, wherein the output of the optical coupling circuit comprises a first output and a second output, the second output being coupled to ground, the comparison circuit further comprising:
an eleventh resistor connected between the first output terminal and the power supply terminal;
a twelfth resistor connected to the first output terminal;
and one end of the third capacitor is connected with the first output end, and the other end of the third capacitor is grounded.
9. The voltage conversion device according to any one of claims 1 to 4, further comprising:
a thirteenth resistor connected between the voltage output circuit and the comparison circuit.
10. A motor control system, comprising:
a controller outputting a first voltage signal;
the voltage conversion device of any one of claims 1 to 9, connected to the controller, the voltage conversion device converting the first voltage signal to a pulse width modulated signal;
and the processor is connected with the voltage conversion device, outputs a control signal according to the pulse width modulation signal and controls the motor according to the control signal.
11. An air conditioner, comprising:
a voltage conversion device according to any one of claims 1 to 9; or
The motor control system of claim 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010465601.5A CN113765464A (en) | 2020-05-28 | 2020-05-28 | Voltage conversion device, motor control system and air conditioner |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010465601.5A CN113765464A (en) | 2020-05-28 | 2020-05-28 | Voltage conversion device, motor control system and air conditioner |
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| CN113765464A true CN113765464A (en) | 2021-12-07 |
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| CN202010465601.5A Pending CN113765464A (en) | 2020-05-28 | 2020-05-28 | Voltage conversion device, motor control system and air conditioner |
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|---|---|---|---|---|
| US4891828A (en) * | 1987-03-09 | 1990-01-02 | Oki Electric Industry Co., Ltd. | Voltage to pulse-width conversion circuit |
| US6281639B1 (en) * | 1999-08-20 | 2001-08-28 | Minebea Co., Ltd. | Cold cathode discharge lamp lighting circuit |
| CN202713720U (en) * | 2012-07-09 | 2013-01-30 | 深圳市垅运照明电器有限公司 | PWM dimming signal generating circuit |
| CN206595973U (en) * | 2016-12-23 | 2017-10-27 | 芜湖国睿兆伏电子有限公司 | A kind of pwm control circuit |
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2020
- 2020-05-28 CN CN202010465601.5A patent/CN113765464A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4891828A (en) * | 1987-03-09 | 1990-01-02 | Oki Electric Industry Co., Ltd. | Voltage to pulse-width conversion circuit |
| US6281639B1 (en) * | 1999-08-20 | 2001-08-28 | Minebea Co., Ltd. | Cold cathode discharge lamp lighting circuit |
| CN202713720U (en) * | 2012-07-09 | 2013-01-30 | 深圳市垅运照明电器有限公司 | PWM dimming signal generating circuit |
| CN206595973U (en) * | 2016-12-23 | 2017-10-27 | 芜湖国睿兆伏电子有限公司 | A kind of pwm control circuit |
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