CN216904711U - Direct current has brush motor regulating circuit and motor drive system - Google Patents
Direct current has brush motor regulating circuit and motor drive system Download PDFInfo
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- CN216904711U CN216904711U CN202123417806.5U CN202123417806U CN216904711U CN 216904711 U CN216904711 U CN 216904711U CN 202123417806 U CN202123417806 U CN 202123417806U CN 216904711 U CN216904711 U CN 216904711U
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Abstract
The utility model belongs to the technical field of electronic circuits, and particularly relates to a direct-current brush motor adjusting circuit and a motor driving system, wherein the direct-current brush motor adjusting circuit comprises a first switch piece, a second switch piece, an inductor L1 and a capacitor C1; the first switch piece and the second switch piece are arranged in series, the non-common end of the first switch piece is connected with a power supply, and the non-common end of the second switch piece is grounded; one end of an inductor L1 is connected with the common end of the first switch piece and the second switch piece, the other end of the inductor L1 is connected with a connecting capacitor C1, the other end of a capacitor C1 is grounded, and the direct current brush motor is connected with a capacitor C1 in parallel. The circuit provided by the utility model can convert pulse input into continuous output, can achieve the purpose of adjusting the rotating speed of the motor through the on-off matching of the two switch pieces, can realize the electronic brake of the direct-current brush motor, and has simple and practical structure.
Description
Technical Field
The utility model belongs to the technical field of electronic circuits, and particularly relates to a direct-current brush motor adjusting circuit and a motor driving system.
Background
The brush DC motor is a DC motor, the stator of the DC brush motor is provided with a fixed main magnetic pole and a brush, and the rotor is provided with an armature winding and a commutator. Electric energy of a direct current power supply enters the armature winding through the electric brush and the commutator to generate armature current, and a magnetic field generated by the armature current interacts with the main magnetic field to generate electromagnetic torque, so that the motor rotates to drive a load.
The direct current brush motor generally adopts the voltage regulation speed governing mode, and traditional speed governing mode generally adopts a switching element such as MOS pipe, directly carries out the chopper speed governing to the motor power through PWM, and what change is the voltage virtual value that adds to direct current brush motor, refers to figure 1. Because the direct current brush motor winding is an inductor, follow current can be carried out when the MOS tube is switched off, and a certain filtering effect is realized on discontinuous voltage. The speed regulation mode has simple structure and low cost.
However, the existing speed regulation mode of the direct current brush motor has obvious defects, and firstly, the voltage is discontinuous, so that the conditions of motor shaking, heating and the like are easily caused; secondly, the rear-end voltage is inconvenient to sample and cannot be stabilized, and when the load of the direct-current brush motor is increased, the effective value of the rear-end voltage is reduced, so that the load performance of the motor cannot be fully exerted. And the speed regulating circuit can not realize the electronic brake of the direct current brush motor.
SUMMERY OF THE UTILITY MODEL
An embodiment of the present invention provides a dc brush motor adjusting circuit, which aims to solve at least one problem in the background art.
The embodiment of the utility model is realized in such a way that the direct current brush motor adjusting circuit comprises a first switch piece, a second switch piece, an inductor L1 and a capacitor C1;
the first switch piece and the second switch piece are arranged in series, the non-common end of the first switch piece is connected with a power supply, and the non-common end of the second switch piece is grounded;
one end of an inductor L1 is connected with the common end of the first switch piece and the second switch piece, the other end of the inductor L1 is connected with a connecting capacitor C1, the other end of a capacitor C1 is grounded, and the direct current brush motor is connected with a capacitor C1 in parallel.
Preferably, the first switching element and/or the second switching element is/are N-type MOS transistors.
Preferably, the first switching element and the second switching element are N-type MOS transistors;
the D pole of the first switch piece is connected with a power supply, and the S pole of the first switch piece is connected with the D pole of the second switch piece;
the S pole of the second switch is grounded.
Preferably, the G pole of the first switching element is connected to the control signal PWM0, and the G pole of the second switching element is connected to the control signal PWM 1.
Preferably, the control signals PWM0 and PWM1 are a complementary pair of PWM control signals.
Preferably, the dc brushed motor adjusting circuit further includes a control chip, and two control ends of the control chip are respectively connected with G poles of the first switch piece and the second switch piece.
Preferably, the dc brushed motor adjusting circuit further comprises a sampling circuit, and the sampling circuit is used for collecting voltage of the motor.
Preferably, the sampling circuit comprises a resistor R1 and a resistor R2,
the resistor R1 and the resistor R2 are connected in series and then connected with the motor in parallel, and the common end of the resistor R1 and the common end of the resistor R2 are connected with the acquisition end of the chip.
It is another object of an embodiment of the present invention to provide a motor driving system, including:
the direct current brush motor adjusting circuit provided by the embodiment of the utility model; and
and the direct current brush motor is driven by the direct current brush motor adjusting circuit.
The circuit provided by the utility model can convert pulse input into continuous output, can achieve the purpose of adjusting the rotating speed of the motor through the on-off matching of the two switch pieces, can realize the electronic brake of the direct-current brush motor, and has simple and practical structure.
Drawings
Fig. 1 is a schematic diagram of an adjustment of a dc brush motor according to the prior art;
fig. 2 is a structural diagram of a dc brush motor adjusting circuit according to an embodiment of the present invention.
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.
Specific implementations of the present invention are described in detail below with reference to specific embodiments.
As shown in fig. 1, a dc brushed motor adjusting circuit provided in an embodiment of the present invention includes a first switch, a second switch, an inductor L1, and a capacitor C1;
the first switch piece and the second switch piece are arranged in series, the non-common end of the first switch piece is connected with a power supply, and the non-common end of the second switch piece is grounded;
one end of an inductor L1 is connected with the common end of the first switch piece and the second switch piece, the other end of the inductor L1 is connected with a connecting capacitor C1, the other end of a capacitor C1 is grounded, and the direct current brush motor is connected with a capacitor C1 in parallel.
In this embodiment, the first switch element and the second switch element may be turned on or off, respectively, so as to place the inductor and the capacitor in a discharging or charging state. It can be understood that, for the first switch member and the second switch member, the common terminal and the non-common terminal are both referred to as non-control terminals; the first switch element and the second switch element may be implemented by various transistors that can be controlled to be turned on or off.
The circuit provided by the utility model can convert pulse input into continuous output, can achieve the purpose of adjusting the rotating speed of the motor through the on-off matching of the two switch pieces, can realize the electronic brake of the direct-current brush motor, and has simple and practical structure.
Preferably, the first switching element and/or the second switching element is/are N-type MOS transistors.
In this embodiment, the circuit shown in fig. 2 takes an N-type MOS transistor as an example; in practice, different types of switch elements are used, with the ends being connected in a slightly different manner, which may depend on the particular switch element selected.
Preferably, the first switching element and the second switching element are N-type MOS transistors;
the D pole of the first switch piece is connected with a power supply, and the S pole of the first switch piece is connected with the D pole of the second switch piece;
the S pole of the second switch is grounded.
In the present embodiment, for an N-type MOS transistor, the specific connection manner is as shown in fig. 1.
Preferably, the G pole of the first switching element is connected to the control signal PWM0, and the G pole of the second switching element is connected to the control signal PWM 1.
In this embodiment, it can be understood that both the control signals PWM0 and PWM1 are pulse control signals, and the generation manner of the pulse control signals is not particularly limited in this embodiment, which can be implemented by referring to the prior art.
Preferably, the control signals PWM0 and PWM1 are a complementary pair of PWM control signals.
In this embodiment, PWM0 and PWM1 are a pair of complementary PWM control signals, i.e. at the same time, one is at a high level, the other is at a low level, and the levels of the two are opposite; in the working state, one of the first switch element and the second switch element is turned on at the same time. When the PWM0 is high, the PWM1 is low, the MOS transistor Q1 is on, and the transistor Q2 is off. Current flows through Q1 to charge L1, and the inductor L1 saturates to charge the back-end capacitor C1. When the PWM0 is low, the PWM1 is high, the MOS transistor Q1 is off, and the transistor Q2 is on. The current is discharged to the ground through the Q2, the Q1 is prevented from being damaged due to the negative voltage of the freewheeling of the inductor L1, and the electricity of the rear-end inductor L1 and the capacitor C1 can be discharged. When the PWM0 duty cycle is lower than the high PWM1 duty cycle, the charging time is long and the back end voltage rises. When the PWM0 duty cycle is low and the PWM1 duty cycle is high, the discharge time is long and the back end voltage decreases. The voltage of the rear end can be adjusted by adjusting the duty ratio of the PWM0 and the PWM1, so that the purpose of adjusting the speed of the direct-current brush motor is achieved.
Preferably, the dc brushed motor adjusting circuit further includes a control chip, and two control ends of the control chip are respectively connected with G poles of the first switch piece and the second switch piece.
In this embodiment, the control chip may be implemented by using a single chip, and the specific type of the single chip capable of outputting two complementary pulse signals and the specific setting manner of the peripheral auxiliary circuit thereof may be implemented by referring to the prior art, which is not specifically limited in the embodiment of the present invention.
Preferably, the dc brushed motor adjusting circuit further comprises a sampling circuit, and the sampling circuit is used for collecting voltage of the motor.
In this embodiment, through the setting of first switch spare, second switch spare, inductance L1 and electric capacity C1, can change pulse input into continuous output to for the condition that the sampling of motor provided, can realize the voltage acquisition of motor, thereby the rotational speed of calculation motor is convenient for realize speed control.
Preferably, the sampling circuit comprises a resistor R1 and a resistor R2,
the resistor R1 is connected with the resistor R2 in series and then connected with the motor in parallel, and the common end of the resistor R1 and the resistor R2 is connected with the chip acquisition end.
In this embodiment, the specific sizes of the resistor R1 and the resistor R2 are not specifically limited, and the specific connection manner is as shown in fig. 1. It can be understood that the common end of the resistors R1 and R2 is connected to the chip, and the chip acquires the voltage signal and calculates the rotation speed of the motor, thereby realizing the monitoring or automatic adjustment of the rotation speed.
Taking the first switch and the second switch as an example, the working principle of the utility model is described as follows: the single chip microcomputer obtains a voltage sampling signal V _ AD, when the voltage of the motor terminal is detected to be reduced, the duty ratio of PWM0 is increased, the duty ratio of PWM1 is reduced, and the voltage of the motor terminal is increased. When the voltage of the motor terminal is detected to rise, the duty ratio of the PWM0 is reduced, the duty ratio of the PWM1 is increased, and the voltage of the motor terminal drops. The closed-loop control of the rotating speed of the motor is realized, and the effect of stabilizing the voltage is achieved.
In addition, the direct current brush motor can realize electronic braking through the winding short circuit. When electronic braking is needed, Q1 is closed, Q2 is opened, and two ends of a direct current brush motor winding are short-circuited through an inductor L1 and Q2, so that the purpose of electronic braking is achieved.
It is another object of an embodiment of the present invention to provide a motor driving system, including:
the direct current brush motor adjusting circuit provided by the embodiment of the utility model; and
and the direct current brush motor is driven by the direct current brush motor adjusting circuit.
In the embodiment, the direct current brush motor is controlled by the direct current brush motor adjusting circuit provided by the utility model, pulse input can be converted into continuous output, the purpose of adjusting the rotating speed of the motor can be achieved by the on-off cooperation of the two switch pieces, meanwhile, the electronic brake of the direct current brush motor can be realized, and the structure is simple and practical.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the utility model, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A DC brush motor adjusting circuit is characterized by comprising a first switch piece, a second switch piece, an inductor L1 and a capacitor C1;
the first switch piece and the second switch piece are arranged in series, the non-common end of the first switch piece is connected with a power supply, and the non-common end of the second switch piece is grounded;
one end of an inductor L1 is connected with the common end of the first switch piece and the second switch piece, the other end of the inductor L1 is connected with a connecting capacitor C1, the other end of a capacitor C1 is grounded, and the direct current brush motor is connected with a capacitor C1 in parallel.
2. The dc brushed motor adjusting circuit according to claim 1, wherein the first switching element and/or the second switching element is an N-type MOS transistor.
3. The dc brushed motor adjusting circuit according to claim 1, wherein the first switching element and the second switching element are N-type MOS transistors;
the D pole of the first switch piece is connected with a power supply, and the S pole of the first switch piece is connected with the D pole of the second switch piece;
the S pole of the second switch is grounded.
4. The DC brushed motor regulating circuit according to claim 3, wherein the G pole of the first switching element is connected to the control signal PWM0, and the G pole of the second switching element is connected to the control signal PWM 1.
5. The DC brushed motor regulating circuit according to claim 4, wherein the control signals PWM0 and PWM1 are a complementary pair of PWM control signals.
6. The DC brushed motor regulating circuit according to claim 4, further comprising a control chip, wherein two control terminals of the control chip are respectively connected to the G poles of the first switching element and the second switching element.
7. The dc brushed motor conditioning circuit of any of claims 1-6 further comprising a sampling circuit for voltage acquisition of the motor.
8. The DC brushed motor adjusting circuit of claim 7, wherein the sampling circuit comprises a resistor R1 and a resistor R2,
the resistor R1 is connected with the resistor R2 in series and then connected with the motor in parallel, and the common end of the resistor R1 and the resistor R2 is connected with the chip acquisition end.
9. A motor drive system, characterized by comprising:
the dc brushed motor regulating circuit according to any one of claims 1-8; and
and the direct current brush motor is driven by the direct current brush motor adjusting circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123417806.5U CN216904711U (en) | 2021-12-31 | 2021-12-31 | Direct current has brush motor regulating circuit and motor drive system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123417806.5U CN216904711U (en) | 2021-12-31 | 2021-12-31 | Direct current has brush motor regulating circuit and motor drive system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216904711U true CN216904711U (en) | 2022-07-05 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123417806.5U Active CN216904711U (en) | 2021-12-31 | 2021-12-31 | Direct current has brush motor regulating circuit and motor drive system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216904711U (en) |
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2021
- 2021-12-31 CN CN202123417806.5U patent/CN216904711U/en active Active
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