CN112928928A - Intelligent adjustment output power supply chip and power supply circuit with same - Google Patents
Intelligent adjustment output power supply chip and power supply circuit with same Download PDFInfo
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- CN112928928A CN112928928A CN202110348584.1A CN202110348584A CN112928928A CN 112928928 A CN112928928 A CN 112928928A CN 202110348584 A CN202110348584 A CN 202110348584A CN 112928928 A CN112928928 A CN 112928928A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of DC power input into DC power output
- H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
- H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
- H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
- H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
- H02J7/04—Regulation of charging current or voltage
- H02J7/06—Regulation of charging current or voltage using discharge tubes or semiconductor devices
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of AC power input into DC power output; Conversion of DC power input into AC power output
- H02M7/02—Conversion of AC power input into DC power output without possibility of reversal
- H02M7/04—Conversion of AC power input into DC power output without possibility of reversal by static converters
- H02M7/12—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/2176—Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only comprising a passive stage to generate a rectified sinusoidal voltage and a controlled switching element in series between such stage and the output
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- H—ELECTRICITY
- 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
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J2207/20—Charging or discharging characterised by the power electronics converter
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
本发明公开了一种智能调整输出功率电源芯片及具有它的电源电路，智能调整输出功率电源芯片包括：开关管、驱动模块、初级功率控制模块，初级功率控制模块与开关电源的原边电压反馈端及驱动模块连接，并对所述开关电源的原边电压反馈端的反馈电压进行输出功率控制。当输出电流增大时，可为瞬间需要较多驱动功率的设备提供给恒定的功率输出，可满足例如电机设备上电时所需的大功率电流值。避免由于电机开机时由于产生大电流而导致芯片进行过流保护状态，而导致芯片停止工作而无法驱动电机设备正常启动的问题。且在马达电机正常工作后，电源自动切换成恒压模式，为电机设备提供正常供电电源。
The invention discloses an intelligently adjusted output power power supply chip and a power supply circuit having the same. The intelligently adjusted output power power supply chip comprises: a switch tube, a drive module, a primary power control module, the primary power control module and the primary side voltage feedback of the switching power supply The terminal is connected to the driving module, and the output power is controlled for the feedback voltage of the primary voltage feedback terminal of the switching power supply. When the output current increases, a constant power output can be provided for devices that require more driving power instantaneously, which can meet the high-power current value required by, for example, motor devices when they are powered on. To avoid the problem that the chip is in an overcurrent protection state due to the large current generated when the motor is turned on, and the chip stops working and cannot drive the motor device to start normally. And after the motor motor works normally, the power supply automatically switches to the constant voltage mode to provide normal power supply for the motor equipment.
Description
Technical Field
The invention relates to the technical field of power supplies, in particular to an intelligent output power adjusting power supply chip and a power supply circuit with the same.
Background
Along with the increasing improvement of the living standard of people, electric motor class products become more and more, for example intelligent house: electric tools such as massage chairs, massage cushions and footbaths. Because this kind of product is depending on the motor drive mechanical part to work, its starting current is bigger than the current when normal operation, if design according to ordinary constant current type adapter, the overcurrent protection point OCP of adapter is about 2 times of rated output current, calculate the power of adapter according to formula P2 times of its rated power for UI, thus will cause the volume of adapter to become very big, the cost will rise along with it. In addition, the common adapter is easy to have overcurrent protection phenomenon due to overlarge starting current when the motor is started, so that the motor equipment cannot be normally started.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art. Therefore, an object of the present invention is to provide an intelligent regulated output power supply chip and a power supply circuit having the same.
On one hand, to achieve the above object, an embodiment of the present invention provides an intelligent regulation output power supply chip, including:
the switching tube is used for being connected with a primary side transformer of the switching circuit so as to control the primary side transformer to generate pulse voltage;
the signal output end of the driving module is connected with the control end of the switch tube and used for conducting or stopping driving control on the switch tube;
and the primary power control module is connected with the primary voltage feedback end of the switching power supply and the driving module and is used for carrying out output power control on the feedback voltage of the primary voltage feedback end of the switching power supply.
Further, according to an embodiment of the present invention, the smart regulated output power supply chip further includes: and the frequency adjusting module is respectively connected with the primary side voltage feedback end of the switching power supply and the primary power control module so as to adjust and control the switching frequency according to the voltage feedback value.
Further, according to an embodiment of the present invention, the output power control includes:
constant output power control: when the output power exceeds the rated power and is less than the maximum power, controlling the constant power output;
and (3) power output reduction control: when the output power exceeds the maximum power, the control reduces the power output.
Further, according to an embodiment of the present invention, the smart regulated output power supply chip further includes:
and the primary power control module is connected with a primary voltage feedback end of the switching circuit through the voltage detection module.
Further, according to an embodiment of the present invention, the smart regulated output power supply chip further includes:
and the primary constant voltage control module is used for being connected with the primary voltage feedback end of the switching power supply and the driving module and carrying out constant voltage control processing on the feedback voltage of the primary voltage feedback end of the switching power supply.
Further, according to an embodiment of the present invention, the smart regulated output power supply chip further includes: and the primary power control module is connected with a primary current feedback end of the switching power supply through the line compensation module so as to perform slope compensation processing on output current.
Further, according to an embodiment of the present invention, the smart regulated output power supply chip further includes: and the PWM valley bottom detection module is connected with the driving module and used for detecting the valley of the switching waveform and controlling the conduction of the switching tube through the driving module.
In another aspect, the present invention further provides a power supply circuit, including:
the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current;
one end of the input end of the transformer is connected with the alternating current-direct current conversion circuit, and the transformer is used for converting the high-voltage direct current into pulse direct current;
the input end of the output voltage stabilizing circuit is connected with the output end of the transformer, and the output voltage stabilizing circuit is used for converting the pulse direct current into low-voltage direct current to be output;
in the above intelligent regulation output power supply chip, one signal output end of the switching tube is connected to the other end of the input end of the transformer, the other signal output end of the switching tube is connected to a reference ground, and the intelligent regulation output power supply chip is used for controlling the output of the transformer power;
the voltage feedback circuit is connected with the transformer and a voltage feedback end of the intelligent regulation output power supply chip;
and the current feedback circuit is connected with the current feedback end of the intelligent regulation output power supply chip.
Further, according to an embodiment of the present invention, the voltage feedback circuit includes: one end of the resistor R5 is connected with one end of the transformer, the other end of the resistor R5 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with a reference ground, and a common end of the resistor R5 and the resistor R6 is connected with a voltage sampling end of the intelligent regulation output power supply chip;
the current feedback circuit includes: and one end of the resistor R3 is connected with the current adoption end of the intelligent adjustment output power supply chip, and the other end of the resistor R3 is connected with a reference ground.
The intelligent regulation output power supply chip provided by the embodiment of the invention is used for being connected with a primary side transformer of a switching circuit through a switching tube so as to control the primary side transformer to generate pulse voltage; the signal output end of the driving module is connected with the control end of the switch tube and is used for conducting or stopping driving control on the switch tube; the primary power control module is connected with the primary voltage feedback end of the switching power supply and the driving module and is used for controlling the output power of the feedback voltage of the primary voltage feedback end of the switching power supply. The constant power adapter formed by the intelligent adjustment output power chip can provide constant power output for equipment needing more driving power instantly when the output current is increased, and can meet the requirement of high-power current value needed when motor equipment is powered on. The problem that the chip stops working and cannot drive motor equipment to normally start due to the fact that the chip is in an overcurrent protection state caused by large current generated when the motor is started is solved. And after the motor works normally, the power supply is automatically switched into a constant voltage mode to provide a normal power supply for the motor equipment. Because the current limiting function is realized at the primary stage, a secondary current detection resistor is not needed, the overall cost of the circuit is reduced, charging equipment with different powers is charged by adjusting the output power of the primary stage, the intelligent degree is high, and the use is convenient.
Drawings
Fig. 1 is a schematic diagram of a power circuit structure according to an embodiment of the invention;
fig. 2 is a block diagram of a power supply chip for intelligently adjusting output power according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of an output power curve of a power circuit according to an embodiment of the present invention;
fig. 4 is a graph illustrating a relationship between an output frequency and a power of a power circuit according to an embodiment of the invention.
Reference numerals:
a direct-alternating current conversion circuit 10;
an intelligent regulation output power supply chip 20;
input voltage stabilizing circuit 30
A voltage transformation circuit 40;
an auxiliary voltage transformation power supply circuit 50;
a voltage stabilization output circuit 60;
A voltage feedback circuit 90.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the invention. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is explicitly and implicitly understood by one skilled in the art that the embodiments described herein can be combined with other embodiments.
Referring to fig. 1, an embodiment of the present invention provides an intelligent regulated output power chip 20, including: the power supply comprises a switching tube, a driving module and a primary power control module, wherein the switching tube is used for being connected with a primary side transformer of a switching circuit so as to control the primary side transformer to generate pulse voltage; the signal output end of the driving module is connected with the control end of the switch tube and is used for conducting or stopping driving control on the switch tube; the primary power control module is connected with the primary voltage feedback end of the switching power supply and the driving module and is used for controlling the output power of the feedback voltage of the primary voltage feedback end of the switching power supply.
Referring to fig. 2 and 3, for example, the collector of the switching tube is used to connect to one end of the primary transformer, and the other end of the primary transformer is connected to the power supply end of the power supply. And the emitter of the switching tube is connected with a reference ground, and the current on the primary side transformer is controlled to be switched on and switched off through the switching tube so as to perform PWM (pulse width modulation) on the primary side transformer.
The signal output end of the driving module is connected with the control end of the switching tube and is used for conducting or stopping driving control on the switching tube; the driving module is connected with the grid electrode of the switching tube to control the on-off of the switching tube by outputting a PWM control signal, so that the primary side transformer is PWM pulse-modulated.
The output power control includes: constant output power control and reduced power output control: when the output power exceeds the rated power and is less than the maximum power, controlling the constant power output; specifically, when the voltage feedback terminal FB reaches a typical value of 4V, the primary power control module enters a constant power mode. In the constant mode, the chip will operate at the maximum current value CS and the maximum switching frequency, and the power will maintain a constant line maximum power. In practice, the constant power varies slightly due to variations in system duty cycle and efficiency. As shown by the upper oblique line in fig. 3, in the constant power mode, the output power is a constant value, and in the case of keeping the power relatively constant, the output voltage changes correspondingly according to the change of the output current, specifically, the upper oblique line in fig. 3. When the output current is too large, the internal constant/step-down power module enables the voltage feedback voltage of the PWM control chip U1 to be always kept below a set value VTH _ PL, the PWM control chip U1 is not enabled to enter an overcurrent protection state through a feedback pin any more, but the output voltage automatically and correspondingly decreases along with the increase of the output current, so that the power borne by the power adapter is constant, and when the output current continues to increase, the output voltage continues to decrease and enters a power-down mode.
Because the current limiting function is realized at the primary stage, a secondary current detection resistor is not needed, the overall cost of the circuit is reduced, charging equipment with different powers is charged by adjusting the output power of the primary stage, the intelligent degree is high, and the use is convenient.
When the output power exceeds the maximum power, the control reduces the power output. As shown by the lower portion of the sloped line in fig. 3, in the reduced power output mode, when the voltage drops below 1.1V, the output power control will operate in the reduced power mode until the voltage is below 0.6V and the output power control will enter the hiccup mode.
Through the primary power control module, constant power can be output when the output power reaches a larger power value instantly. Therefore, enough large starting current can be provided for the moment of starting the motor, namely, the power supply works in a constant power state under the large current state of starting or abnormal and the like of the motor; after the motor works normally, the power supply is automatically switched to a constant voltage mode.
The intelligent regulation output power supply chip 20 provided by the embodiment of the invention is used for being connected with a primary side transformer of a switching circuit through a switching tube so as to control the primary side transformer to generate pulse voltage; the signal output end of the driving module is connected with the control end of the switch tube and is used for conducting or stopping driving control on the switch tube; the primary power control module is connected with the primary voltage feedback end of the switching power supply and the driving module and is used for controlling the output power of the feedback voltage of the primary voltage feedback end of the switching power supply. The constant power adapter formed by the intelligent regulation output power chip 20 can provide constant power output for equipment needing more driving power instantly when the output current is increased, and can meet the requirement of high-power current value needed when motor equipment is powered on. The problem that the chip stops working and cannot drive motor equipment to normally start due to the fact that the chip is in an overcurrent protection state caused by large current generated when the motor is started is solved. And after the motor works normally, the power supply is automatically switched into a constant voltage mode to provide a normal power supply for the motor equipment. Because the current limiting function is realized at the primary stage, a secondary current detection resistor is not needed, the overall cost of the circuit is reduced, charging equipment with different powers is charged by adjusting the output power of the primary stage, the intelligent degree is high, and the use is convenient.
Referring to fig. 2 and 4, the smart regulated output power chip 20 further includes: and the frequency adjusting module is respectively connected with the primary side voltage feedback end of the switching power supply and the primary power control module so as to adjust and control the switching frequency according to the voltage feedback value. As shown in fig. 4, the frequency adjustment module is based on a feedback voltage. When the output load is light (Vfb < Vfb _ burst), the frequency adjustment module operates in burst mode. Like the adaptive frequency adjustment part and the adjusted pulse width part in fig. 4 (curve of 0-20% F.L), in this mode, the load is light, the output power is small, and the frequency of the switch is small.
As the output load increases (Vfb > Vfb _ burst), the frequency adjustment module smoothly enters the green mode, such as the arcuate curve section (20% to max. power section curve) in fig. 4, in which the switching frequency rises linearly from Fmin to Fmax, with the pulse width also following real-time adjustment, so that the adapter operates in the optimum power saving mode.
The output load then increases to a maximum load (Vfb ═ Vfb _ max, Vvd >1.1V), and the frequency adjustment module enters a constant power mode (CP mode). As in the fixed frequency curve portion (max. power curve portion in the direction of the arrow) of fig. 4, in this mode, the frequency adjustment module switches the frequency Fmax to the maximum frequency, so that the adapter operates in the maximum power output mode. Therefore, the output voltage decreases, the output current increases, and the voltage decreases accordingly.
When the voltage drops below 1.1V, the frequency adjustment module will operate in a power down mode (PR mode), such as the down conversion curve portion (last sloped portion) of fig. 4, where the switching frequency is reduced from Fmax to Fmin, until the voltage is below 0.6V, and the frequency adjustment module enters hiccup mode. When the voltage is reduced to the minimum value, the hiccup mode is entered, and whether the voltage is recovered to the normal state is intermittently detected.
The frequency adjusting module provided by the embodiment of the invention adjusts and controls the switching frequency according to the voltage feedback value. The operating frequency and pulse width are adjusted in real time by the feedback voltage, so that when the power supply operates in different states, the frequency and pulse width can be adjusted in real time to ensure that the adapter can operate at an optimal efficiency level.
Referring to fig. 2 and 3, the output power control includes: constant output power control and reduced power output control: when the output power exceeds the rated power and is less than the maximum power, controlling the constant power output;
when the output power exceeds the maximum power, the control reduces the power output. As shown by the upper oblique line in fig. 3, in the constant power mode, the output power is a constant value, and in the case of keeping the power relatively constant, the output voltage changes correspondingly according to the change of the output current, specifically, the upper oblique line in fig. 3. When the output current is too large, the internal constant/step-down power module enables the voltage feedback voltage of the PWM control chip U1 to be always kept below a set value VTH _ PL, the PWM control chip U1 is not enabled to enter an overcurrent protection state through a feedback pin any more, but the output voltage automatically and correspondingly decreases along with the increase of the output current, so that the power borne by the power adapter is constant, and when the output current continues to increase, the output voltage continues to decrease and enters a power-down mode.
Referring to fig. 2 and 3, the intelligent regulation output power chip 20 further includes: and the primary power control module is connected with a primary voltage feedback end of the switching circuit through the voltage detection module. As shown in fig. 2 and 3, the voltage detection module is disposed at the primary voltage feedback end of the switching circuit, and can detect the voltage value at the primary voltage feedback end of the switching circuit to obtain a voltage value, perform corresponding processing, and output the voltage value to the constant voltage control module and the constant/reduced power control module, thereby implementing control of voltage and power. The voltage detection module samples the voltage value through the ADC, and outputs the voltage value to the constant voltage control module and the constant/reduced power control module after the voltage value is subjected to related voltage quantization processing.
Referring to fig. 2 and 3, the smart regulated output power chip 20 further includes: and the primary constant voltage control module is used for being connected with the primary voltage feedback end of the switching power supply and the driving module and carrying out constant voltage control processing on the feedback voltage of the primary voltage feedback end of the switching power supply. As shown in fig. 2 and 3, the primary constant voltage control module is configured to be connected to a primary voltage feedback end of the switching power supply and the driving module, and perform constant voltage control processing on a feedback voltage at the primary voltage feedback end of the switching power supply; as shown in fig. 2 and 3, the primary voltage of the switching power supply is fed back to the primary constant voltage control module, and the primary constant voltage control module performs constant voltage output processing according to the feedback value of the primary voltage, so that the output voltage of the power-on circuit can keep constant voltage output, and thus, the output voltage is stable. Specifically, the parallel straight-line portion V0 in fig. 3 is a constant power supply voltage value at the time of normal power supply. When the output current is increased in motor driving, a large power current value required when, for example, the electric machine device is powered on can be satisfied by the constant power mode. And after the motor works normally, the power supply is automatically switched into a constant voltage mode to provide a normal power supply for the motor equipment.
Referring to fig. 2 and 3, the smart regulated output power chip 20 further includes: and the primary power control module is connected with a primary current feedback end of the switching power supply through the line compensation module so as to perform slope compensation processing on output current. As shown in fig. 2 and 3, in battery charging and motor driving, the slope control is performed on the output current through the line compensation module and the primary constant current control module to meet the current slope requirements of battery charging and motor driving, so as to realize safe charging of the battery, ensure the charging safety of the battery and prolong the service life of the battery. The battery charging curve can be divided into three phases: during the trickle charge phase, the battery is fully charged and the output current is in a maintenance state. And a quick charging stage: at this time, the battery is charged quickly. The direct drive motor provides a large current or a battery just discharges the large current charging stage: a large current is supplied for charging and/or motor driving.
Referring to fig. 2, the smart regulated output power chip 20 further includes: and the PWM valley bottom detection module is connected with the driving module and used for detecting the valley of the switching waveform and controlling the conduction of the switching tube through the driving module. As shown in fig. 2, through the built-in bottom of valley detection module, whether the current voltage is in the bottom of valley state on the driven MOS switch tube of detectable to when the bottom of valley state, carry out the operation of switching on with the MOS switch tube, so make the loss of MOS switch tube little, provide power MOS switch tube efficient.
Referring to fig. 1, in another aspect, an embodiment of the present invention further provides a power circuit, including: the intelligent power supply comprises an alternating current-direct current conversion circuit, a transformer, an output voltage stabilizing circuit, the intelligent output power adjusting power supply chip 20, a voltage feedback circuit 90 and a current feedback circuit 80, wherein the alternating current-direct current conversion circuit is used for converting input alternating current into high-voltage direct current; the alternating current-direct current conversion circuit comprises a bridge rectifier circuit BD1 and a voltage stabilizing circuit, wherein the bridge rectifier circuit BD1 rectifies input alternating current into a pulse direct current power supply, outputs the pulse direct current power supply to the voltage stabilizing circuit, is arranged into voltage-stabilized high-voltage direct current through the voltage stabilizing circuit, and outputs the voltage-stabilized high-voltage direct current to the transformer. The voltage stabilizing circuit comprises an inductor L1 and a capacitor EC2, and a low-pass filter circuit is formed by the inductor L1 and the capacitor EC 2. Therefore, a high-frequency power supply signal in the power supply signal at the output end of the bridge rectifier circuit BD1 is filtered, and a stable direct-current power supply is output.
One end of the input end of the transformer is connected with the alternating current-direct current conversion circuit, and the transformer is used for converting the high-voltage direct current into pulse direct current;
the input end of the output voltage stabilizing circuit is connected with the output end of the transformer, and the output voltage stabilizing circuit is used for converting the pulse direct current into low-voltage direct current for output; as shown in fig. 1, in one embodiment of the present invention, the output voltage stabilizing circuit includes a diode D7 and a capacitor EC4, the anode of the diode D7 is connected to the secondary output terminal of the transformer, the cathode of the diode D7 is connected to one terminal of the capacitor EC4, and the terminal of the capacitor EC4 is connected to ground. The diode D7 prevents the electric quantity in the capacitor EC4 from flowing back to the transformer, and stabilizes and outputs the pulse dc at the output of the transformer 50.
One signal output end of the switch tube is connected with the other end of the input end of the transformer, the other signal output end of the switch tube is connected with a reference ground, and the intelligent regulation output power supply chip 20 is used for controlling the transformation power output of the transformer.
The voltage feedback circuit 90 is connected with the transformer and the voltage feedback end of the intelligent regulation output power supply chip 20; the current feedback circuit 80 is connected to the current feedback end of the intelligent regulation output power supply chip 20. The current and voltage of the primary coil of the voltage transformer can be fed back to the intelligent regulation output power supply chip 20 through the voltage feedback circuit 90 and the current feedback circuit 80, and the output power, the voltage and the working frequency are regulated through the intelligent regulation output power supply chip 20.
According to the power supply circuit provided by the embodiment of the invention, through the constant power adapter with the structure, when the output current is increased, constant power output can be provided for equipment needing more driving power instantly, and the requirement of high-power current value when motor equipment is powered on can be met. The problem that the chip stops working and cannot drive motor equipment to normally start due to the fact that the chip is in an overcurrent protection state caused by large current generated when the motor is started is solved. And after the motor works normally, the power supply is automatically switched into a constant voltage mode to provide a normal power supply for the motor equipment. Because the current limiting function is realized at the primary stage, a secondary current detection resistor is not needed, the overall cost of the circuit is reduced, charging equipment with different powers is charged by adjusting the output power of the primary stage, the intelligent degree is high, and the use is convenient.
Referring to fig. 1, the voltage feedback circuit 90 includes: one end of the resistor R5 is connected with one end of the transformer, the other end of the resistor R5 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with a reference ground, and a common end of the resistor R5 and the resistor R6 is connected with a voltage sampling end of the intelligent regulation output power supply chip 20; the current feedback circuit 80 includes: one end of the resistor R3 is connected with the current adoption end of the intelligent adjustment output power supply chip 20, and the other end of the resistor R3 is connected with a reference ground. As shown in fig. 1, the resistor R4 and the resistor R5 are connected in series to divide the voltage of the primary winding of the transformer and output the divided voltage to the voltage feedback terminal of the main control circuit. The voltage is divided by the resistor R5 and the resistor R6 and then fed back to the voltage detection end of the intelligent adjustment output power supply chip 20, so that the intelligent adjustment output power supply chip 20 can adjust power, voltage, pulse frequency and pulse width in real time according to the voltage value, and the adapter can work at the best efficiency level. Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing detailed description, or equivalent changes may be made in some of the features of the embodiments. All equivalent structures made by using the contents of the specification and the attached drawings of the invention can be directly or indirectly applied to other related technical fields, and are also within the protection scope of the patent of the invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention.
Claims (9)
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| CN202110348584.1A CN112928928A (en) | 2021-03-31 | 2021-03-31 | Intelligent adjustment output power supply chip and power supply circuit with same |
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| CN202110348584.1A CN112928928A (en) | 2021-03-31 | 2021-03-31 | Intelligent adjustment output power supply chip and power supply circuit with same |
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