CN217282714U

CN217282714U - Direct current motor driving power supply based on PSR technology

Info

Publication number: CN217282714U
Application number: CN202220126255.2U
Authority: CN
Inventors: 何建秋; 如熠
Original assignee: Shenzhen Xinyi Kechuang Electronics Co ltd
Current assignee: Shenzhen Xinyi Kechuang Electronics Co ltd
Priority date: 2022-01-18
Filing date: 2022-01-18
Publication date: 2022-08-23
Anticipated expiration: 2032-01-18

Abstract

The utility model discloses a direct current motor drive power supply based on PSR technique, including PSR main control chip, PSR main control chip's input is connected with FB detection resistance and CS current-limiting resistance respectively, FB detection resistance's input is connected with power transformer, power transformer's output is connected with the power tube, the input of power tube with PSR main control chip's output is connected, the output of power tube with CS current-limiting resistance's input is connected, power transformer's output is connected with the motor load. The PSR main control chip adopts an XY3018FB type main control chip, the power tube adopts a 3-8A/650V type power tube, and the power transformer adopts an eel2267 type low-power transformer. The FB detection resistor is a 0805 chip resistor, and the CS current limiting resistor is a 1206 chip resistor. The utility model discloses reduce the volume, practiced thrift the cost.

Description

Direct current motor driving power supply based on PSR technology

Technical Field

The utility model relates to a direct current motor technical field specifically is a direct current motor drive power supply based on PSR technique.

Background

A dc motor, such as a wire feeder motor of a welding machine or a fan motor, is an inductive load, and requires a relatively large current at the start moment (generally, 2-3 times of a normal steady-state operating current, and the requirement on the stability of output voltage is not high, and can allow a certain degree of variation). In order to cope with the peak power output of the dc motor driving power supply, the conventional voltage source is often adopted in the existing power supply: and a secondary side feedback scheme (SSR) amplifies an overcurrent point and meets the actual requirement of a customer by providing total output power.

The conventional auxiliary power supply of the motor generally adopts a secondary feedback scheme (SSR). Then, the overflow point is set to be larger, and the actual requirement of a client is met by improving the total output power. As in FIG. 4;

the secondary side feedback chip mainly has 2 approaches to control the PWM switching signal of the built-in power tube: the current loop control is mainly to detect the primary current through a CS current limiting resistor Rcs to adjust a PWM signal to control the Ton time of a built-in switching tube to control the output power. Voltage loop control, detecting the fluctuation of output voltage through a three-terminal voltage stabilizer and an optical coupler (red frame part in the upper figure), and adjusting a PWM signal to control the Ton time of a built-in switching tube to control the output power. But SSR schemes generally support only CC mode with voltammograms as in figure 5. Until the output current reaches the maximum value Iomax, the output voltage maintains the stable output voltage Vo. When the output voltage is increased to the maximum value Iomax, the power supply can be immediately turned off, the output voltage is reduced to 0V, and the power supply enters hiccup type protection or is locked. Therefore, for the SSR power scheme, when the SSR power scheme is used in the field of motors, the maximum output current value Iomax must be set to be large to ensure the normal start of the motor in order to obtain an inductive load such as a rear-end motor. If Iomax is set to be large and the output voltage Vo is still a normal output voltage, the required overall output power will be large, which may result in: a. the cost and the volume can be increased by adding a three-terminal regulator and an optical coupler in principle; b. the specifications of components such as a transformer and an input capacitor of a power supply need to be larger by one (in order to ensure the maximum output current and prevent the transformer from being saturated). The volume and cost may increase. And when the system works normally, Io is smaller. Resulting in more power waste.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a direct current motor drive power supply based on PSR technique. The utility model discloses a PSR control chip U1 of built-in power tube controls output voltage Vo (saves three terminal regulator and optical coupler) through transformer T1 secondary winding Ns and auxiliary winding Nf coupling, detects primary side current through CS current-limiting resistance Rcs, under the condition of output current increase, reduces output voltage, can be under the condition that the power does not turn-off, guarantees the start-up of motor. The primary side control (PSR) technology is introduced into the field of direct current motors, and through a CC/CV mode of primary side control, a power supply can not be turned off due to the fact that the motors have high output current capacity when started, and a small transformer and a small input capacitor can be used, so that a three-terminal voltage stabilizer and an optical coupler are omitted, the size is reduced, and the cost is saved.

The utility model discloses a realize like this:

the utility model provides a direct current motor drive power supply based on PSR technique, includes PSR main control chip U1, PSR main control chip U1's input is connected with FB detection resistance (R1 and R2)) and CS current-limiting resistor Rcs respectively, FB detection resistance (R1 and R2)'s input is connected with power transformer T1, power transformer's output and power tube are connected, the input of power tube with PSR main control chip U1's output is connected, the output of power tube with CS current-limiting resistor's input is connected, power transformer's output is connected with the motor load. The input end of the power transformer T1 is connected with an input voltage.

Further, the PSR main control chip adopts an XY3018FB type main control chip, the power tube adopts a 3-8A/650V type power tube, and the power transformer adopts an EE19-EE28 type small power transformer. The FB detection resistors R1 and R2 adopt 0805 chip resistors; and the CS current-limiting resistor Rcs adopts a 1206 chip resistor.

Compared with the prior art, the beneficial effects of the utility model are that: the output voltage Vo is controlled by coupling the secondary winding Ns and the auxiliary winding Nf of the transformer through a PSR control chip U1 with a built-in power tube (a three-terminal regulator and an optical coupler are omitted), the primary current is detected through a CS current-limiting resistor Rcs, the output voltage is reduced under the condition that the output current is increased, and the starting of the motor can be ensured under the condition that a power supply is not turned off. The primary side control (PSR) technology is introduced into the field of direct current motors, and through a CC/CV mode of primary side control, a power supply can not be turned off due to the fact that the motors have high output current capacity when started, and a small transformer and a small input capacitor can be used, so that a three-terminal voltage stabilizer and an optical coupler are omitted, the size is reduced, and the cost is saved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

Fig. 1 is a schematic diagram of the system structure of the present invention;

fig. 2 is a circuit diagram of the present invention;

FIG. 3 is a plot of SSR versus PSR voltammogram;

FIG. 4 is a system diagram of a conventional secondary-side feedback scheme (SSR);

FIG. 5 is a conventional voltammogram;

fig. 6 is a voltammogram of a conventional PSR.

Detailed Description

To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the attached drawings in the embodiments of the present invention are combined below to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are part of the embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention. Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1-3, a PSR technology-based dc motor driving power supply includes a PSR main control chip U1, an input end of the PSR main control chip U1 is connected to an FB detection resistor (R1 and R2)) and a CS current limiting resistor Rcs, an input end of the FB detection resistor (R1 and R2) is connected to a power transformer T1, an output end of the power transformer is connected to a power tube, an input end of the power tube is connected to an output end of the PSR main control chip U1, an output end of the power tube is connected to an input end of the CS current limiting resistor, and an output end of the power transformer is connected to a motor load. The input end of the power transformer T1 is connected with an input voltage.

The primary side feedback chip mainly has 2 approaches to control the PWM switching signal of the built-in power tube:

(ii) Current Loop control

The primary side current is detected through a CS current limiting resistor Rcs to adjust a PWM signal to control the Ton time of a switching tube so as to control the output power. Unlike secondary feedback. The primary feedback current loop control can work in a CC/CV mode through internal calculation. The output current when the motor is started can be ensured, and the power supply can not be switched off.

② voltage loop control

The output power is controlled by regulating a PWM signal to control the Ton time of a switching tube through the turn ratio of a secondary winding Ns and a feedback winding Nf of the transformer and detecting the fluctuation of the output voltage through pull-up resistors R1 and R2 of an FB pin (a three-terminal regulator and an optical coupler of an SSR are omitted).

The output voltage Vo is calculated by (R1/R2+1) Vfb Ns/Nf-Vd

Wherein Vo is the output voltage;

r1: a resistor is pulled up by the FB pin;

r2: a pull-down resistor of the FB pin;

vfb: the FB pin of the chip is subjected to reference voltage;

ns: the number of turns of a secondary winding of the transformer;

nf: the number of turns of the auxiliary winding of the transformer;

vd: the forward conduction voltage drop of the output diode.

The voltammogram of the PSR is as shown in fig. 6: the output voltage is maintained at the maximum output voltage until the maximum output power Pomax is reached. After the maximum output power Pomax is reached, the output current is continuously increased, and the output voltage linearly decreases before the output current reaches the maximum Iomax, so that the power supply cannot be turned off. The start-up of the motor can be maintained. Only when the output voltage drops below the VDD under-voltage protection point coupled to the front stage PSR chip will the power supply be turned off compared to the current-voltage curve of the SSR, as shown in fig. 3. The PSR can obtain a larger output current value than the SSR under the condition of outputting the same power. The PSR scheme uses in the motor field like this, so the utility model discloses relative to the SSR scheme more easily take inductive load such as its motor. And simultaneously, a three-terminal regulator and an optical coupler are omitted. Under the condition of the same maximum output current Iomax, a smaller transformer and an input capacitor can be used, so that the size and the cost are saved, and the application prospect is wider.

In this embodiment, the PSR main control chip is an XY3018FB type main control chip, the power tube is a 3-8A/650V type power tube, and the power transformer is an EE19-EE28 type small power transformer. The FB detection resistors R1 and R2 adopt 0805 chip resistors; and the CS current-limiting resistor Rcs adopts a 1206 chip resistor.

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

1. The utility model provides a direct current motor drive power supply based on PSR technique which characterized in that: including the PSR main control chip, the input of PSR main control chip is connected with FB detection resistance and CS current-limiting resistance respectively, the input of FB detection resistance is connected with power transformer, power transformer's output is connected with the power tube, the input of power tube with the output of PSR main control chip is connected, the output of power tube with the input of CS current-limiting resistance is connected, power transformer's output is connected with the motor load.

2. The PSR technology-based direct current motor driving power supply as claimed in claim 1, wherein the PSR main control chip is an XY3018FB type main control chip, the power tube is a 3-8A/650V type power tube, and the power transformer is a eel2267 type small power transformer.

3. The PSR (power supply resistor) technology-based direct-current motor driving power supply as claimed in claim 1, wherein the FB detection resistor is 0805 chip resistor, and the CS current limiting resistor is 1206 chip resistor.