CN213094076U

CN213094076U - 12V power supply circuit for motor driving

Info

Publication number: CN213094076U
Application number: CN202021942429.XU
Authority: CN
Inventors: 郭延东; 魏世忠
Original assignee: Shenzhen Yuanli Operation Control Technology Co ltd
Current assignee: Shenzhen Yuanli Operation Control Technology Co ltd
Priority date: 2020-09-08
Filing date: 2020-09-08
Publication date: 2021-04-30
Anticipated expiration: 2030-09-08

Abstract

The utility model belongs to the technical field of charging equipment, in particular to a 12V power supply circuit for motor driving, a switching power supply chip is arranged between a transformer circuit and a middle-section filter circuit, the transformer circuit adopts a transformer comprising a primary winding, a first secondary winding and a second secondary winding, the output end of the middle-section filter circuit is connected with the power pin of the switching power supply chip, two ends of the primary winding form a loop, one end of the primary winding is connected with the output end of the middle-section filter circuit, the other end of the primary winding is connected with the drain electrode pin of the switching power supply chip, one end of the first secondary winding is grounded, the other end of the first secondary winding is connected with the power pin of the switching power supply chip, the other end of the first secondary winding is connected with the feedback pin of the switching power supply chip, one end of the second secondary winding is grounded, the other end of the second secondary winding passes through the, and feedback regulation is carried out to ensure the stability of the 12V power supply.

Description

12V power supply circuit for motor driving

Technical Field

The utility model belongs to the technical field of motor drive, especially, relate to a 12V power supply circuit for motor drive.

Background

The brushless DC motor adopts an electronic reversing device to replace a mechanical reversing device of the traditional DC motor, has mechanical characteristics similar to those of the DC motor, and magnetic steel of the brushless DC motor is arranged on a rotor and generates a rotating magnetic field to drive the rotor to rotate by continuously changing the power-on mode of a stator winding. Because the rotor adopts the permanent magnet structure, the brushless direct current motor has the characteristics of small volume, light weight and simple structure. With the development of power electronic technology, brushless dc motors are more and more widely used.

The stability of the power supply of the brushless direct current motor influences the rotating speed, the torque, the power, the efficacy and the like of the power supply of the brushless direct current motor, however, the power supply of the brushless direct current motor in the existing market is usually 12V voltage obtained by directly reducing the voltage through a transformer, although filter circuits are arranged at the front end and the rear end of the transformer, the output voltage is still unstable, and therefore the brushless direct current motor is easy to damage.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problem that is used for motor drive's power to be stable inadequately among the prior art, the utility model provides an adopt switching power supply chip's voltage stabilizing circuit is realized through following scheme:

A12V power supply circuit for motor drive comprises a protection circuit, a front-section filter circuit, a rectifying circuit, a middle-section filter circuit, a voltage transformation circuit and a rear-section filter circuit which are sequentially arranged from front to back, and further comprises a switch power supply chip arranged between the middle-section filter circuit and the voltage transformation circuit, wherein the voltage transformation circuit adopts a transformer comprising a primary winding, a first secondary winding and a second secondary winding, the output end of the middle-section filter circuit is connected with a power supply pin of the switch power supply chip, two ends of the primary winding form a loop, one end of the primary winding is connected with the output end of the middle-section filter circuit, the other end of the primary winding is connected with a drain electrode pin of the switch power supply chip, one end of the first secondary winding is grounded, the other end of the first secondary winding is connected with the power supply pin of the switch power supply chip all the way, one end of the second secondary winding is grounded, and the other end of the second secondary winding outputs voltage through the rear-section filter circuit.

As a further improvement of the utility model relates to a 12V power supply circuit for motor drive, protection circuit is including setting up the protective tube on the L line and setting up the piezo-resistor between L line and N line.

As a further improvement of the utility model relates to a 12V power supply circuit for motor drive, anterior segment filter circuit is including setting up discharge resistance, suppression electromagnetic interference's condenser and common mode inductance between L line and N line, middle section filter circuit and back end filter circuit all adopt pi type filter circuit.

As a further improvement of the utility model relates to a 12V power supply circuit for motor drive, switching power supply chip's power pin is connected with middle section filter circuit's output through step-down resistance to be connected with the one end of first secondary winding through backward diode.

The utility model discloses a beneficial effect for motor drive's 12V power supply circuit: the transformer with two secondary windings is adopted, a switching power supply chip is additionally arranged, one secondary winding is used for generating 12V voltage, and the other secondary winding is used as feedback voltage of the switching power supply chip, so that the switching power supply chip monitors whether the generated 12V voltage is stable in real time and performs feedback regulation, the stability of the 12V power supply is ensured, and the running stability of the motor is greatly improved.

Drawings

Fig. 1 is a circuit diagram in an embodiment of the present invention;

in the figure: 1. the protection circuit comprises a protection circuit 2, a front-section filter circuit 3, a rectification circuit 4, a middle-section filter circuit 5, a switching power supply chip 6, a transformer 7 and a rear-section filter circuit.

Detailed Description

The present invention will be further described with reference to the following examples, which are only part of the present invention, and these examples are only used to explain the present invention, and do not constitute any limitation to the scope of the present invention.

A12V power supply circuit for motor drive, set up protective circuit 1, forepart filter circuit 2, rectifier circuit, middle section filter circuit 4, switching power supply chip 5, vary voltage circuit and back filter circuit 7 sequentially from voltage input end to voltage output end, specifically, as shown in figure 1 of the specification, protective circuit 1 includes fuse tube F1 and varistor CNR1 connected between L line and N line that L line connects, wherein fuse tube F1 melts and protects the circuit when the electric current is too big, varistor CNR1 is used for inhibiting the peak in the transient of input voltage; the front-end filter circuit 2 comprises a discharge resistor arranged between an L line and an N line, a first capacitor C1 for suppressing power supply electromagnetic interference and a common-mode inductor T2, wherein the discharge resistor comprises a third resistor R3 and a fourth resistor R4 which are connected in series; the rectifier circuit adopts a bridge rectifier BD1 with the model number of ABS10, a thermistor is arranged at the front end of the bridge rectifier BD1, and a second resistor R2 in the figure shows that the rectifier circuit can effectively suppress surge current formed by surge voltage generated in initial work, and when the circuit enters steady-state work, the circuit generates heat due to continuous working current in the circuit, so that the organization becomes very small, and the influence on the circuit can be completely ignored; the middle-stage filter circuit adopts a pi-type filter circuit, and is shown as a first inductor L1, a first point solution capacitor EC1 and a second point solution capacitor EC2 in the figure.

The key point is that a voltage transformation circuit is arranged at the rear end of the middle-stage filter circuit, a double-winding transformer 6 is adopted in the voltage transformation circuit and comprises a primary winding, a first secondary winding and a second secondary winding, and the first secondary winding is connected with a switching power supply chip. Specifically, two ends of the primary winding form a loop, that is, two ends of the primary winding are connected with a fifth resistor R5, a sixth resistor R6, an anti-interference capacitor CX2, a seventh resistor R7, and a second diode D2, wherein a cathode of the second diode D2 faces to an output end of the middle-stage filter circuit, one path of the output end of the middle-stage filter circuit is sequentially connected with a power pin VDD of the switching power chip 5 through a fourth resistor R4 and a ninth resistor R9, the other path of the output end of the middle-stage filter circuit is connected with one end of the primary winding, the other end of the primary winding is connected with an anode of the second diode D2 through a Drain pin Drain the switching power chip 5, and the other path of the output end of; one end of the first secondary winding is grounded, one path of the other end of the first secondary winding is connected with a power supply pin VDD of the switching power supply chip through an anode of a third diode D3 and a tenth resistor R10 in sequence, the other path of the first secondary winding is connected with a feedback pin FB of the switching power supply chip 5 through a twelfth resistor R12, and the feedback pin FB of the switching power supply chip is also grounded through a thirteenth resistor R14.

One end of the second secondary winding is grounded, the other end of the second secondary winding is led out of a 12V power supply through the rear-stage filter circuit 7, the rear-stage filter circuit adopts a pi-type filter circuit as the middle-stage filter circuit, as shown in the figure, a second inductor L2, a third electrolytic capacitor C3 and a second capacitor C2 are arranged, and a first diode D1 is further arranged at the front end of the second inductor L2 and used for single-phase conduction.

It can be seen that the power pin VDD of the switching power supply chip 5 is provided by two paths, and when the switching power supply chip 5 is initially powered on, the output end of the middle-stage filter circuit provides power for the switching power supply chip through the fourth resistor R4 and the ninth resistor R9; when the switching power supply chip works stably, the first secondary winding supplies power to the switching power supply chip through the third diode D3 and the tenth resistor R10. A mos tube is integrated in the switching power supply chip to control the switching power supply chip, namely, a Drain pin Drain, when the internal mos tube is switched on, a loop is formed between the primary winding and the switching power supply chip 5, and when the internal mos tube is switched on and off, two ends of the primary winding form a loop. In addition, a feedback pin FB connected with the twelfth resistor R12 and the thirteenth resistor R13 forms a feedback output voltage for comparing with a reference 2V voltage in the switching power supply chip and adjusting the duty ratio of the input voltage to change the output power, thereby ensuring the stability of the voltage. As in this embodiment, the first secondary winding is set to 22 turns and the second secondary winding is set to 15 turns, and through the turn ratio, if the second secondary winding outputs 15V, the first secondary winding output needs to be 22V, and in order to make the voltage of the feedback pin FB 2V, a voltage dividing circuit with appropriate resistance needs to be selected to implement, that is, the twelfth resistor R12/the thirteenth resistor R13 is 10, where the twelfth resistor R12 is 27K Ω and the thirteenth resistor R13 is 2.7K Ω.

Then compare the 12V power supply circuit who has only set up filter circuit and step-down transformer among the prior art, the switching power supply chip that adds can further guarantee output power's stability, and then promotes motor operating stability.

The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments, and although the present invention has been disclosed with the preferred embodiments, it is not limited to the present invention, and any skilled person in the art can make some modifications or equivalent changes without departing from the technical scope of the present invention.

Claims

1. The utility model provides a 12V power supply circuit for motor drive, includes protection circuit, anterior segment filter circuit, rectifier circuit, middle section filter circuit, vary voltage circuit and back end filter circuit that set gradually after to in the past, its characterized in that: still including set up in switching power supply chip between middle section filter circuit and the vary voltage circuit, the vary voltage circuit adopts the transformer that includes primary, first secondary and second secondary, middle section filter circuit's output with switching power supply chip's power pin is connected, primary's both ends constitute the return circuit to primary's one end and middle section filter circuit's output are connected, and its other end is connected with switching power supply chip's drain electrode pin, first secondary's one end ground connection, its other end is connected with switching power supply chip's power pin all the way, and another way is connected with switching power supply chip's feedback pin, second secondary's one end ground connection, its other end warp back end filter circuit output voltage.

2. A 12V power supply circuit for a motor drive according to claim 1, wherein: the protection circuit comprises a protective tube arranged on the L line and a piezoresistor arranged between the L line and the N line.

3. A 12V power supply circuit for a motor drive according to claim 1, wherein: the front-section filter circuit comprises a discharge resistor, a capacitor and a common-mode inductor, wherein the discharge resistor, the capacitor and the common-mode inductor are arranged between an L line and an N line, and the common-mode inductor and the middle-section filter circuit and the rear-section filter circuit both adopt pi-type filter circuits.

4. A 12V power supply circuit for a motor drive according to claim 1, wherein: and a power pin of the switching power supply chip is connected with the output end of the middle-stage filter circuit through a voltage reduction resistor and is connected with one end of the first secondary winding through a reverse diode.