CN216699831U - Control circuit and motor control device - Google Patents
Control circuit and motor control device Download PDFInfo
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- CN216699831U CN216699831U CN202122765216.5U CN202122765216U CN216699831U CN 216699831 U CN216699831 U CN 216699831U CN 202122765216 U CN202122765216 U CN 202122765216U CN 216699831 U CN216699831 U CN 216699831U
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Abstract
The application provides a control circuit and motor control device, control circuit includes: the logic control chip is provided with two voltage input ends; the voltage regulating circuit is electrically connected with the logic control chip and is provided with two voltage output ends, and the voltage output ends are used for being connected with a load; the voltage sampling circuit is connected to a connection loop of the voltage output end and the load, and is used for collecting the voltage at the connection point of the connection loop and the voltage sampling circuit; a voltage feedback circuit; the voltage feedback circuit is respectively electrically connected with the voltage sampling circuit and the logic control chip and is used for detecting the voltage value acquired by the voltage sampling circuit and sending a feedback signal to the logic control chip; the logic control chip is used for controlling and regulating the output voltage of the voltage regulating circuit. The method and the device solve the problem that the existing microcontroller is low in operation efficiency of control algorithms of different circuit modules.
Description
Technical Field
The application relates to the technical field of motor control, in particular to a control circuit and a motor control device.
Background
At present, in motor driving, a motor control algorithm part is usually realized by using a software mode, such as a PI control algorithm commonly used in a motor, but the software realization mode of the algorithm occupies memory resources in a Microcontroller (MCU), so that the Microcontroller (MCU) has low operation efficiency on control algorithms of different circuit modules.
SUMMERY OF THE UTILITY MODEL
The embodiment of the application provides a control circuit and a motor control device, and solves the problem that the operation efficiency of the existing microcontroller to control algorithms of different circuit modules is low.
The present invention is achieved as such, a control circuit comprising:
a logic control chip having two voltage input terminals;
the voltage regulating circuit is electrically connected with the logic control chip and is provided with two voltage output ends, and the voltage output ends are used for being connected with a load;
the voltage sampling circuit is connected to a connection loop of the voltage output end and the load, and is used for collecting voltage at a connection point of the connection loop and the voltage sampling circuit;
a voltage feedback circuit; the voltage feedback circuit is respectively electrically connected with the voltage sampling circuit and the logic control chip and is used for detecting the voltage value acquired by the voltage sampling circuit and sending a feedback signal to the logic control chip;
the logic control chip is used for controlling and adjusting the output voltage of the voltage adjusting circuit.
According to the control circuit provided by the embodiment of the application, the voltage value on the connection loop between the voltage output end and the load is collected by the voltage sampling circuit, then the feedback signal is obtained through analysis of the voltage feedback circuit and is input into the logic control chip, the output voltage of the voltage adjusting circuit can be controlled and adjusted by the logic control chip according to the feedback signal, and therefore the effect of adjusting the voltage of the driving load can be achieved.
In one embodiment, the voltage sampling circuit comprises a low-side driving chip and a first resistor, wherein one end of the first resistor is connected with the low-side driving chip, and the other end of the first resistor is grounded.
In one embodiment, the voltage feedback circuit comprises a first comparator, and two input ends of the first comparator are respectively connected with a reference voltage and a sampling voltage of the voltage sampling circuit;
and the output end of the first comparator is connected with the logic control chip.
In one embodiment, the reference voltage is a voltage output by a microcontroller in a device in which the control circuit is located;
the first comparator is connected to the input end of the reference voltage, a voltage regulator is connected to the input end of the reference voltage, the reference voltage is connected to the voltage regulator, and the voltage regulator is used for reducing the reference voltage.
In one embodiment, the voltage regulation circuit comprises an oscillator, a voltage converter, a second comparator and a third comparator;
the oscillator is electrically connected with the logic control chip and the voltage converter respectively and is used for generating a clock signal;
the input end of the second comparator is electrically connected with the logic control chip and the voltage converter respectively, and the output end of the second comparator is used for connecting a switching circuit;
the input end of the third comparator is respectively and electrically connected with the logic control chip and a preset voltage source, and the output end of the third comparator is used for connecting a switching circuit;
the switching circuit has two voltage output terminals, which are a first voltage output terminal and a second voltage output terminal, respectively.
In one embodiment, the switching circuit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor and a fourth field effect transistor;
the grid electrode of the first field effect transistor is connected with the output end of the second comparator, and the grid electrode of the second field effect transistor is connected with the output end of the third comparator;
the source electrode of the first field effect transistor and the drain electrode of the second field effect transistor are both connected with the first voltage output end, and the source electrode of the third field effect transistor and the drain electrode of the fourth field effect transistor are both connected with the second voltage output end;
and the drain electrode of the first field effect transistor and the drain electrode of the third field effect transistor are both used for connecting the voltage converter and the drain electrode voltage, and the source electrode of the second field effect transistor and the source electrode of the fourth field effect transistor are both used for connecting the third comparator and the low-side driving chip.
In one embodiment, the control circuit further comprises a fault detection circuit, the fault detection circuit comprises an OR gate circuit, and the output end of the OR gate circuit is electrically connected with the logic control chip;
and the input end of the OR gate circuit is used for connecting the first field-effect tube and the third field-effect tube.
In one embodiment, the input end of the or gate circuit is further used for connecting the temperature detection device and the over-current detection device.
In one embodiment, a voltage buffer circuit is connected to the voltage input end, and the voltage buffer circuit comprises a buffer and a second resistor;
one end of the second resistor is connected with the buffer and the input voltage source, the other end of the second resistor is grounded, and the other end of the buffer is connected with the voltage input end.
The embodiment of the application also provides a motor control device which comprises the control circuit in any embodiment.
The application provides a control circuit and motor control device's beneficial effect lies in: according to the voltage sampling circuit, the voltage value on a connecting loop between the voltage output end and the load is collected through the voltage sampling circuit, then a feedback signal used for indicating the voltage high or low input into the load is obtained through analysis of the voltage feedback circuit, and the feedback signal is input into the logic control chip, the logic control chip can control the output voltage of the voltage adjusting circuit to be increased or decreased according to the feedback signal, and therefore the voltage of the driving load can be adjusted. The load driving circuit can be arranged outside the microcontroller, the driving voltage of the load can be controlled without an application software control algorithm, and the memory resource of the microcontroller cannot be occupied, so that the operation efficiency of the microcontroller on the control algorithms of other circuit modules is improved, the driving of the load is independently controlled through the control circuit, and the control efficiency of the load driving can be improved.
Drawings
FIG. 1 is a block diagram of a control circuit provided in an embodiment of the present application;
fig. 2 is a circuit diagram of a control circuit provided in an embodiment of the present application.
Reference numerals: 10. a logic control chip;
20. a voltage regulation circuit; 201. a voltage output terminal; 21. an oscillator; 22. a voltage converter; 23. a second comparator; 24. a third comparator; 2011. a first voltage output terminal; 2012. a second voltage output terminal;
100. a load;
30. a voltage sampling circuit;
40. a voltage feedback circuit; 41. a first comparator; 42. a voltage regulator;
50. a fault detection circuit;
60. a voltage buffer circuit; 61. a buffer.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
It should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
The embodiment of the application provides a control circuit and a motor control device, and solves the problem that the operation efficiency of the existing microcontroller to control algorithms of different circuit modules is low.
Fig. 1 is a block diagram of a control circuit according to a preferred embodiment of the present invention, which only shows the relevant parts of the present embodiment for convenience of description, and the following details are provided:
referring to fig. 1, a control circuit provided in the embodiment of the present application includes a logic control chip 10, where the logic control chip 10 has two voltage input terminals; the voltage regulating circuit 20, the voltage regulating circuit 20 is electrically connected with the logic control chip 10, the voltage regulating circuit 20 has two voltage output ends 201, the voltage output ends 201 are used for connecting the load 100; the voltage sampling circuit 30 is connected to a connection loop of the voltage output end 201 and the load 100, and the voltage sampling circuit 30 is used for collecting voltage at a connection point of the connection loop and the voltage sampling circuit 30; a voltage feedback circuit 40; the voltage feedback circuit 40 is respectively electrically connected with the voltage sampling circuit 30 and the logic control chip 10, and the voltage feedback circuit 40 is used for detecting the voltage value collected by the voltage sampling circuit 30 and sending a feedback signal to the logic control chip 10; the logic control chip 10 is used for controlling and regulating the output voltage of the voltage regulating circuit 20.
According to the control circuit provided by the embodiment of the application, the voltage value on the connection loop between the voltage output end 201 and the load 100 is collected by using the voltage sampling circuit 30, then the feedback signal is analyzed by the voltage feedback circuit 40 and input into the logic control chip 10, the output voltage of the voltage regulating circuit 20 is controlled and regulated by the logic control chip 10 according to the feedback signal, so that the voltage for driving the load 100 can be regulated, the control circuit of the embodiment can be arranged outside the microcontroller, the driving voltage of the load 100 can be controlled by a hardware circuit, the memory resource of the microcontroller cannot be occupied, and thus the operation efficiency of the microcontroller on the control algorithm of other circuit modules can be improved, the drive of the load 100 is independently controlled by the hardware circuit, and the control efficiency of the drive of the load 100 can also be improved.
In one embodiment, referring to fig. 2, the voltage sampling circuit 30 includes a low side driver LSS and a first resistor R1, wherein one end of the first resistor R1 is connected to the low side driver LSS, and the other end is connected to ground. The voltage sampling circuit 30 can collect the voltage value at a certain position on the connection loop of the voltage output end 201 and the load 100, so as to reflect the voltage value and the current value of the driving load 100, thereby facilitating the adjustment.
In one embodiment, referring to fig. 2, the voltage feedback circuit 40 includes a first comparator 41, two input terminals of the first comparator 41 are respectively connected to the reference voltage VREF and the sampling voltage of the voltage sampling circuit 30; the output end of the first comparator 41 is connected with the logic control chip 10. The first comparator 41 compares the reference voltage VREF with the voltage collected by the voltage sampling circuit 30 to determine whether the driving voltage of the load 100 is higher or lower, so as to generate a feedback signal for increasing or decreasing the driving voltage of the load 100, and the feedback signal is input into the logic control chip 10, so that the logic control chip 10 can accurately control and adjust the driving voltage of the load 100 according to the feedback signal.
It should be noted that the reference voltage VREF may be adjustable, and the reference standard for determining whether the driving voltage of the load 100 is higher or lower may be adjusted by adjusting the value of the reference voltage VREF, so that the reference voltage VREF may be adjusted to different values when the loads 100 of different specifications are used, and thus the control circuit of this embodiment can control the driving voltages of the loads 100 of different specifications more accurately and more efficiently.
In one embodiment, referring to fig. 2, the reference voltage VREF is the voltage output by a microcontroller in the device in which the control circuit is located; the input end of the first comparator 41 connected to the reference voltage VREF is connected to a voltage regulator 42, the reference voltage VREF is connected to the voltage regulator 42, and the voltage regulator 42 is configured to reduce the reference voltage VREF.
It should be noted that, because the first resistor R1 of the voltage sampling circuit 30 divides the voltage to cause the voltage value input to the load 100 to become small, the sampling voltage of the voltage sampling circuit 30 is set in a small range, so that the voltage value on the connection loop between the voltage output terminal 201 and the load 100 can be collected to reflect the magnitude of the driving voltage value of the load 100, and too much driving voltage of the load 100 is not consumed; since the input terminal of the first comparator 41 is connected to the reference voltage VREF and the sampling voltage of the voltage sampling circuit 30, and the sampling voltage of the voltage sampling circuit 30 is small, the reference voltage VREF needs to be set to a small value, but the reference voltage VREF in this embodiment is a voltage output by a microcontroller in a device in which the control circuit is located, and is much larger than the sampling voltage of the voltage sampling circuit 30, and therefore the voltage regulator 42 is set to reduce the value of the reference voltage VREF. Illustratively, the value of reference voltage VREF may be scaled by a factor of 10 by voltage regulator 42.
In one embodiment, referring to fig. 2, the voltage regulating circuit 20 includes an oscillator 21, a voltage converter 22, a second comparator 23, and a third comparator 24; the oscillator 21 is electrically connected with the logic control chip 10 and the voltage converter 22 respectively, and the oscillator 21 is used for generating a clock signal; the input end of the second comparator 23 is electrically connected with the logic control chip 10 and the voltage converter 22 respectively, and the output end of the second comparator 23 is used for connecting the switch circuit; the input end of the third comparator 24 is electrically connected with the logic control chip 10 and the preset voltage source respectively, and the output end of the third comparator 24 is used for connecting the switch circuit; the switching circuit has two voltage output terminals 201, a first voltage output terminal 2011 and a second voltage output terminal 2012.
In the above configuration, the logic control chip 10 controls the Oscillator (OSC)21 to generate a clock signal, and when the voltage converter (Charge Pump)22 receives a high-level clock signal, the voltage value input to the second comparator 23 is increased or decreased, so that the output level of the second comparator 23 is changed, thereby changing the conduction path in the switch circuit, so that the output voltage at the voltage output terminal 201 is adjusted; the voltage value of the preset voltage source connected to the input terminal of the third comparator 24 may be any value smaller than the rated voltage of the load 100, wherein the preset voltage of 7V is adopted in the present embodiment.
In one embodiment, referring to fig. 2, the switching circuit includes a first fet Q1, a second fet Q2, a third fet Q3, and a fourth fet Q4; the grid electrode of the first field effect transistor Q1 is connected with the output end of the second comparator 23, and the grid electrode of the second field effect transistor Q2 is connected with the output end of the third comparator 24; the source of the first fet Q1 and the drain of the second fet Q2 are both connected to the first voltage output 2011, and the source of the third fet Q3 and the drain of the fourth fet Q4 are both connected to the second voltage output 2012; the drain of the first fet Q1 and the drain of the third fet Q3 are both used to connect the voltage converter 22 and the drain voltage VBB, and the source of the second fet Q2 and the source of the fourth fet Q4 are both used to connect the third comparator 24 and the low side driver chip LSS.
Illustratively, when the voltage of the input load 100 is lower and needs to be adjusted to be higher, the logic control chip 10 controls the first fet Q1 and the fourth fet Q4 to be turned on, and the second fet Q2 and the third fet Q3 to be turned off, at which time the voltage values output by the first voltage output terminal 2011 and the second voltage output terminal 2012 increase, and when the voltage of the input load 100 is higher and needs to be adjusted to be lower, the logic control chip 10 controls the first fet Q1 and the third fet Q3 to be turned off, and the second fet Q2 and the fourth fet Q4 to be turned on, at which time the voltage values output by the first voltage output terminal 2011 and the second voltage output terminal 2012 decrease, which is simple in control manner and easy to implement.
In one embodiment, referring to fig. 1-2, the control circuit further includes a fault detection circuit 50, the fault detection circuit 50 includes an or gate circuit, and an output terminal of the or gate circuit is electrically connected to the logic control chip 10; the input end of the OR gate circuit is used for connecting the first field effect transistor Q1 and the third field effect transistor Q3. The fault detection circuit 50 can detect the fault existing in the control circuit, so that the logic control circuit can stop driving the load 100 in time, the or gate circuit can be connected with the first field effect transistor Q1 and the third field effect transistor Q3, according to the characteristics of the or gate, when any one field effect transistor connected with the input end of the or gate circuit has a fault, the or gate circuit can send a fault signal to the logic control chip 10, and at the moment, the regulation of the voltage input to the load 100 may be inaccurate, so that the logic control chip 10 stops driving the load 100 after receiving the fault signal, so as to prevent the normal operation of the load 100 from being influenced by the inaccurate regulation of the driving voltage, and even burn out the load 100.
In one embodiment, the input end of the or gate circuit is also used for connecting the temperature detection device and the over-current detection device. The fault detection circuit 50 of the present embodiment can detect whether the temperature of the control circuit is abnormal and whether an overcurrent occurs in the control circuit, in addition to detecting whether the first fet Q1 and the third fet Q3 have faults, because these conditions may affect the accurate adjustment of the voltage input to the load 100, it can timely find whether the temperature of the control circuit is abnormal and whether the overcurrent occurs through the detection of the temperature and the overcurrent, so that the logic control chip 10 can timely stop driving the load 100.
In one embodiment, referring to fig. 2, a voltage buffer circuit 60 is connected to the voltage input terminal, and the voltage buffer circuit 60 includes a buffer 61 and a second resistor R2; one end of the second resistor R2 is connected to the buffer 61 and the input voltage source, the other end is grounded, and the other end of the buffer 61 is connected to the voltage input terminal. The voltage buffer circuit 60 can prevent the voltage input into the logic control chip 10 from the voltage input end from damaging the logic control chip 10 by directly inputting the voltage into the logic control chip 10.
The embodiment of the application also provides a motor control device which comprises the control circuit in any one of the above embodiments.
The motor control device of the embodiment of the application adopts the control circuit, the voltage sampling circuit 30 collects the voltage value on the connection loop between the voltage output end 201 and the load 100, then the feedback signal for indicating the high or low voltage input into the load 100 is obtained through analysis of the voltage feedback circuit 40, and is input into the logic control chip 10, and the logic control chip 10 controls the output voltage of the voltage regulation circuit 20 to increase or decrease according to the feedback signal, so that the function of regulating the voltage for driving the load 100 can be achieved. The driving circuit can be arranged outside the microcontroller, the driving voltage of the load 100 can be controlled without an application software control algorithm, and the memory resource of the microcontroller cannot be occupied, so that the operation efficiency of the microcontroller on the control algorithms of other circuit modules is improved, the driving of the load 100 is independently controlled through the control circuit, and the control efficiency of the driving of the load 100 can be improved.
The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present application, and shall be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A control circuit, comprising:
a logic control chip (10), the logic control chip (10) having two voltage input terminals;
a voltage regulating circuit (20), wherein the voltage regulating circuit (20) is electrically connected with the logic control chip (10), and the voltage regulating circuit (20) is provided with two voltage output ends (201) which are used for connecting a load (100);
the voltage sampling circuit (30), the voltage sampling circuit (30) is connected to a connection loop of the voltage output end (201) and the load (100), and the voltage sampling circuit (30) is used for collecting the voltage at the connection point of the connection loop and the voltage sampling circuit (30);
a voltage feedback circuit (40); the voltage feedback circuit (40) is respectively electrically connected with the voltage sampling circuit (30) and the logic control chip (10), and the voltage feedback circuit (40) is used for detecting the voltage value collected by the voltage sampling circuit (30) and sending a feedback signal to the logic control chip (10);
the logic control chip (10) is used for controlling and adjusting the output voltage of the voltage adjusting circuit (20).
2. The control circuit of claim 1, wherein the voltage sampling circuit (30) comprises a low-side driver chip and a first resistor, one end of the first resistor is connected to the low-side driver chip, and the other end of the first resistor is grounded.
3. The control circuit according to claim 2, wherein the voltage feedback circuit (40) comprises a first comparator (41), two input terminals of the first comparator (41) are respectively connected to a reference voltage and a sampling voltage of the voltage sampling circuit (30);
the output end of the first comparator (41) is connected with the logic control chip (10).
4. The control circuit of claim 3, wherein the reference voltage is a voltage output by a microcontroller in a device in which the control circuit is located;
the first comparator (41) is connected to the input end of the reference voltage, a voltage regulator (42) is connected to the input end of the reference voltage, the reference voltage is connected to the voltage regulator (42), and the voltage regulator (42) is used for reducing the reference voltage.
5. The control circuit according to any of claims 2-4, wherein the voltage regulating circuit (20) comprises an oscillator (21), a voltage converter (22), a second comparator (23) and a third comparator (24);
the oscillator (21) is electrically connected with the logic control chip (10) and the voltage converter (22) respectively, and the oscillator (21) is used for generating a clock signal;
the input end of the second comparator (23) is respectively and electrically connected with the logic control chip (10) and the voltage converter (22), and the output end of the second comparator (23) is used for connecting a switching circuit;
the input end of the third comparator (24) is respectively and electrically connected with the logic control chip (10) and a preset voltage source, and the output end of the third comparator (24) is used for connecting a switching circuit;
the switching circuit has two voltage output terminals (201), a first voltage output terminal (2011) and a second voltage output terminal (2012), respectively.
6. The control circuit of claim 5, wherein the switching circuit comprises a first field effect transistor, a second field effect transistor, a third field effect transistor, and a fourth field effect transistor;
the grid electrode of the first field effect transistor is connected with the output end of the second comparator (23), and the grid electrode of the second field effect transistor is connected with the output end of the third comparator (24);
the source electrode of the first field effect transistor and the drain electrode of the second field effect transistor are both connected with the first voltage output end (2011), and the source electrode of the third field effect transistor and the drain electrode of the fourth field effect transistor are both connected with the second voltage output end (2012);
the drain electrode of the first field effect transistor and the drain electrode of the third field effect transistor are both used for being connected with the voltage converter (22) and the drain electrode voltage, and the source electrode of the second field effect transistor and the source electrode of the fourth field effect transistor are both used for being connected with the third comparator (24) and the low-side driving chip.
7. The control circuit of claim 6, further comprising a fault detection circuit (50), the fault detection circuit (50) comprising an OR gate, an output of the OR gate being electrically connected to the logic control chip (10);
and the input end of the OR gate circuit is used for connecting the first field-effect tube and the third field-effect tube.
8. The control circuit of claim 7, wherein the input of the OR gate is further configured to connect a temperature detection device and an over-current detection device.
9. The control circuit of claim 1, wherein a voltage buffer circuit (60) is connected to the voltage input terminal, the voltage buffer circuit (60) comprising a buffer (61) and a second resistor;
one end of the second resistor is connected with the buffer (61) and the input voltage source, the other end of the second resistor is grounded, and the other end of the buffer (61) is connected with the voltage input end.
10. A motor control device, characterized by comprising a control circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122765216.5U CN216699831U (en) | 2021-11-11 | 2021-11-11 | Control circuit and motor control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122765216.5U CN216699831U (en) | 2021-11-11 | 2021-11-11 | Control circuit and motor control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216699831U true CN216699831U (en) | 2022-06-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202122765216.5U Active CN216699831U (en) | 2021-11-11 | 2021-11-11 | Control circuit and motor control device |
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| CN (1) | CN216699831U (en) |
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2021
- 2021-11-11 CN CN202122765216.5U patent/CN216699831U/en active Active
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