阅读说明：本技术 一种变压输出和低开关损耗的轻型开关电源 (Light-duty switching power supply with variable voltage output and low switching loss ) 是由 侯伟 白蕾 白国政 夏东盛 于 2020-05-28 设计创作，主要内容包括：本发明公开了一种变压输出和低开关损耗的轻型开关电源,开关电源包括显示器、主控制电路和检测电路,主控制电路与检测电路电连接,主控制电路设有输出电压控制器用于调节输出电压,显示器用于显示实时输出电压、电流、功率、频率以及控制电路板的表面温度；输出电压的控制曲线包括：自动启动调节阶段、稳定阶段、手动启动调节阶段、稳定工作阶段以及手动关闭阶段,自动启动调节阶段采用PWM调控输出电压控制器,手动启动调节阶段和手动关闭阶段的输出电压的调节速率一定；稳定工作阶段的输出电压U1的可取区间为：5-24V,稳定约为0.25-1s。本发明实现开关电源可升压和降压输出,而且减少了电路中的分布电感和电容的振荡,降低了开关损耗。(The invention discloses a light switching power supply with variable voltage output and low switching loss, which comprises a display, a main control circuit and a detection circuit, wherein the main control circuit is electrically connected with the detection circuit and is provided with an output voltage controller for regulating output voltage; the control curve of the output voltage comprises: the method comprises an automatic starting and adjusting stage, a stabilizing stage, a manual starting and adjusting stage, a stable working stage and a manual closing stage, wherein the automatic starting and adjusting stage adopts a PWM (pulse width modulation) regulation output voltage controller, and the regulation rate of output voltages of the manual starting and adjusting stage and the manual closing stage is constant; the preferable interval of the output voltage U1 in the stable operation stage is: 5-24V and the stability is about 0.25-1 s. The invention realizes the step-up and step-down output of the switching power supply, reduces the oscillation of distributed inductance and capacitance in the circuit and reduces the switching loss.)

1. A light switch power supply with variable voltage output and low switching loss comprises a shell, a control circuit board, a display and four grounding supports, wherein the control circuit board is fixed inside the shell; the control circuit board comprises a main control circuit and a detection circuit, the main control circuit is electrically connected with the detection circuit, and the detection circuit is used for detecting real-time output voltage and is characterized in that: the main control circuit is provided with an output voltage controller, and the output voltage controller is arranged on the outer side wall of the shell; the display is fixed with the outer wall of the shell and used for displaying real-time output voltage, current, power, frequency and the highest surface temperature of the control circuit board; the control curve of the output voltage comprises: the method comprises an automatic starting and adjusting stage, a stabilizing stage, a manual starting and adjusting stage, a stable working stage and a manual closing stage, wherein the automatic starting and adjusting stage adopts PWM (pulse-width modulation) to regulate and control (a method for digitally coding analog signal level) the output voltage controller, and the manual starting and adjusting stage and the manual closing stage are manually adjusted by an operator at a certain adjusting rate; the output voltage U1 in the stable working stage is the stable output voltage required by working, and the desirable interval of U1 is 5-24V; the stable phase is a transition phase of the PWM regulation and the manual starting regulation, the time interval of the transition phase is 0.25-1s, and the voltage U0 of the transition phase is 2/3U 1.

2. A lightweight switching power supply with variable voltage output and low switching loss as claimed in claim 1, wherein: the duty cycle of the PWM during the autostart conditioning phase has a positive linear relationship with the output voltage.

3. A lightweight switching power supply with variable voltage output and low switching loss as claimed in claim 1, wherein: the duty cycle of the PWM in the stable phase keeps 100% output, and the output voltage keeps U0 unchanged.

4. A lightweight switching power supply with variable voltage output and low switching loss according to claim 2, wherein: the variable quantity of the output voltage in unit time in the manual regulation stage is constant.

5. A lightweight switching power supply with variable voltage output and low switching loss according to claim 2, wherein: and keeping the duty ratio of the PWM in the stable working phase unchanged at 100 percent output.

6. A lightweight switching power supply with variable voltage output and low switching loss as claimed in claim 1, wherein: the PWM regulation does not work during the manual shut-down phase.

Technical Field

The invention relates to the technical field of electrical equipment, in particular to a light switching power supply with variable voltage output and low switching loss.

Background

Switching power supplies are classified into two broad categories, AC/DC conversion (AC to DC) and DC/DC conversion (fixed DC voltage to variable DC voltage), and are generally used in the field of electric and other devices.

For light low-power switching power supplies, the power supplies in the current market are small in size and convenient to use, and are widely applied to the electrical and automation industries, for example, a single-group switching power supply, the rated voltage of the power supply determines the using place of the power supply, generally the power supplies have two kinds of rated voltages of 12V and 24V, and the power supplies are intelligently output according to the rated output voltage, namely the 12V switching power supply cannot output the voltage of 20V or 24V; when the power supply is turned on or turned off, the oscillation of distributed inductance and capacitance occurs in the internal circuit of the power supply, so that the switching loss of the power supply is caused, and the switching loss affects not only the service performance of the power supply, but also the service life and the output precision of the power supply.

And this application improves the optimization to current DC/DC switching power supply, and DC/DC switching power supply can only export fixed voltage in the market, has 12V and 24V two kinds respectively, and not only inconvenient use but also switching loss is great, consequently this application improves this type of switching power supply, adopts the mode that combines automatic start and manual start control, realizes reducing the start-up consumption, adopts the mode of fixed pressure release frequency manual shutoff, realizes reducing the purpose of shutoff consumption.

Disclosure of Invention

Aiming at the problems that the light low-power switching power supply cannot boost or step-down output and has more switching loss in the switching power supply, the invention aims to provide the light switching power supply with variable voltage output and low switching loss, control over the output voltage of the DC/DC switching power supply is increased, so that the light low-power switching power supply can boost and step-down output, the starting power consumption is reduced by adopting a control mode of automatic starting and manual starting, and the purpose of reducing the turn-off power consumption is realized by adopting a mode of manual turn-off with fixed voltage relief frequency.

In order to achieve the technical purpose, the technical scheme provided by the invention is as follows:

a light switch power supply with variable voltage output and low switching loss comprises a shell, a control circuit board, a display and four grounding supports, wherein the control circuit board is fixed inside the shell; the control circuit board comprises a main control circuit and a detection circuit, the main control circuit is electrically connected with the detection circuit, the detection circuit is used for detecting real-time output voltage, the main control circuit is provided with an output voltage controller, and the output voltage controller is arranged on the outer side wall of the shell; the display is fixed with the outer wall of the shell and used for displaying real-time output voltage, current, power and frequency and controlling the highest surface temperature of the circuit board; the control curve of the output voltage comprises: the automatic start-up regulation stage adopts a PWM regulation output voltage controller, the manual start-up regulation stage and the manual close stage are manually regulated by an operator, and the regulation rate is constant; the output voltage U1 in the stable working stage is the stable output voltage required by working, and the desirable interval of U1 is 5-24V; the stabilizing stage is a switching stage of PWM regulation and manual starting regulation, the time interval of the switching stage is 0.25-1s, and the voltage U0 of the switching stage is 2/3U 1.

The detection circuit detects real-time output voltage in the circuit and feeds detected information back to the main control circuit, an output voltage controller in the main control circuit adjusts the output voltage, the output voltage regulator can adopt a roller type voltage regulator, and the clockwise rotation of a roller is changed into pressurization, and the anticlockwise rotation is changed into depressurization. The display on the shell displays real-time output voltage, current, power, frequency and the highest surface temperature of the control circuit board, on the one hand, the real-time power supply working state is conveniently observed, on the other hand, the power supply can be protected from being damaged, because the power supply internal elements are electrified to work, some resistance power supply elements can generate heat in the working process, although the power supply is provided with a heat dissipation system, when the use environment or other conditions cause the heat dissipation to be not smooth, the temperature of the electric control board in the power supply is easy to rise, when the temperature of the surface of the electric control board reaches the working temperature critical value of the internal elements, the elements are easy to be damaged, the temperature of the surface of the electric control board is monitored through the display, when the temperature is too high, the heat dissipation environment is timely adjusted or.

And the lower grounding support of the shell is used for grounding on one hand and supporting the switching power supply on the other hand.

Further, the duty ratio of the PWM in the auto-start regulation phase has a positive linear relationship with the output voltage.

Further, the duty ratio of the PWM in the stable phase keeps 100% output, and the output voltage keeps U0 unchanged.

Furthermore, the variable quantity of the output voltage per unit time in the manual regulation stage is constant.

Further, the duty ratio of the PWM in the stable working phase keeps constant at 100% output.

Further, PWM regulation does not work during the manual shutdown phase.

The PWM regulation assists in an automatic starting process, PWM keeps 100% duty ratio output after the switching power supply is started, after the switching power supply is used, the PWM regulation does not work when the switching power supply is turned off, and the voltage of the power supply is reduced according to a set proportion (the voltage variation in unit time). By adopting the technical scheme, the oscillation of distributed inductance and capacitance in the circuit is reduced, the switching loss of the switching power supply is reduced, and the power consumption of the converter is reduced.

Description of the various phases in the control curve of the output voltage controller:

and (3) automatically starting an adjusting stage: the voltage is increased from 0 to U0 and is stably increased in the phase regulated by PWM, the duty ratio of PWM corresponds to the voltage value one by one, and the direct relationship between the duty ratio and the voltage is shown in the following figure 2. The output voltage of the switching power supply is stably increased in the stage, and internal loss of the switching power supply is avoided.

And (3) a stabilization stage: the duty ratio of the phase is 100% and keeps constant, the output voltage keeps constant at U0, the control circuit has PWM control to switch to manually control the output voltage, and the time of the phase is short.

Manual start-up regulation phase: this stage is the stage of manual regulation power output voltage, and artificial manual roll output voltage controller prevents that different people from rolling speed and dynamics are different, and output voltage's change volume is certain in the settlement unit interval, prevents that the inside regulation of power is disorderly. As shown in fig. 1, the rate of adjustment at this stage remains constant, i.e., the slope of the curve in the graph is constant. When the regulated output voltage reaches the target voltage U1, regulation stops, the voltage is stabilized and the power supply begins to operate normally.

And (3) stabilizing the working stage: the phase is a switching power supply stable output phase, PWM in the phase is still kept unchanged by 100%, and an output voltage controller is kept still.

And (3) manual closing stage: as shown in fig. 1, after the switching power supply is used, the output voltage controller is manually adjusted to reduce the output voltage of the switching power supply to 0V, and then the adjustment is terminated. During adjustment, the output voltage is manually and slowly reduced, the phenomenon that a capacitor and an inductance element inside the switching power supply oscillate due to instantaneous power failure is avoided, and the internal loss of the power supply is reduced.

The invention has the beneficial effects that: the output voltage of the switching power supply is regulated, the switching power supply with high rated voltage can be output in a voltage reduction mode, and the switching power supply with low rated voltage can be output in a voltage boosting mode; and the sectional start reduces the oscillation of distributed inductance and capacitance in the circuit, and reduces the switching loss of the switching power supply.

Drawings

FIG. 1 is a schematic diagram of a control curve of an output voltage controller according to an embodiment;

fig. 2 is a schematic diagram of the relationship between the duty ratio of the PWM and the output voltage in the automatic start-up regulation phase.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings. It should be noted that the terms "upper", "lower", "left" and "right" in the present application are consistent with the terms "upper", "lower", "left" and "right" in the drawings, but are not limited to specific structural orientations.

For light low-power switching power supplies, the power supplies in the current market are small in size and convenient to use, and are widely applied to the electrical and automation industries, for example, a single-group switching power supply, the rated voltage of the power supply determines the using place of the power supply, generally the power supplies have two kinds of rated voltages of 12V and 24V, and the power supplies are intelligently output according to the rated output voltage, namely the 12V switching power supply cannot output the voltage of 20V or 24V; when the power supply is turned on or turned off, the oscillation of distributed inductance and capacitance occurs in the internal circuit of the power supply, so that the switching loss of the power supply is caused, and the switching loss affects not only the service performance of the power supply, but also the service life and the output precision of the power supply.

The application carries out improvement and optimization on the existing DC/DC switching power supply and discloses a light switching power supply with variable voltage output and low switching loss, which comprises a shell, a control circuit board, a display and four grounding supports, wherein the control circuit board is fixed inside the shell; the control circuit board comprises a main control circuit and a detection circuit, the main control circuit is electrically connected with the detection circuit, the detection circuit is used for detecting real-time output voltage, the main control circuit is provided with an output voltage controller, and the output voltage controller is arranged on the outer side wall of the shell; the display is fixed with the outer wall of the shell and used for displaying real-time output voltage, current, power and frequency and controlling the highest surface temperature of the circuit board;

as shown in fig. 1, the control curve of the output voltage includes: the automatic start-up regulation stage adopts a PWM regulation output voltage controller, the manual start-up regulation stage and the manual close stage are manually regulated by an operator, and the regulation rate is constant; the output voltage U1 in the stable working stage is the stable output voltage required by working, and the desirable interval of U1 is 5-24V; the stabilizing stage is a switching stage of PWM regulation and manual starting regulation, the time interval of the switching stage is 0.25-1s, and the voltage U0 of the switching stage is 2/3U 1.

The detection circuit detects real-time output voltage in the circuit and feeds detected information back to the main control circuit, an output voltage controller in the main control circuit adjusts the output voltage, the output voltage regulator can adopt a roller type voltage regulator, and the clockwise rotation of a roller is changed into pressurization, and the anticlockwise rotation is changed into depressurization. The display on the shell displays real-time output voltage, current, power, frequency and the highest surface temperature of the control circuit board, on the one hand, the real-time power supply working state is conveniently observed, on the other hand, the power supply can be protected from being damaged, because the power supply internal elements are electrified to work, some resistance power supply elements can generate heat in the working process, although the power supply is provided with a heat dissipation system, when the use environment or other conditions cause the heat dissipation to be not smooth, the temperature of the electric control board in the power supply is easy to rise, when the temperature of the surface of the electric control board reaches the working temperature critical value of the internal elements, the elements are easy to be damaged, the temperature of the surface of the electric control board is monitored through the display, when the temperature is too high, the heat dissipation environment is timely adjusted or.

And the lower grounding support of the shell is used for grounding on one hand and supporting the switching power supply on the other hand.

Further, the duty ratio of the PWM in the auto-start regulation phase has a positive linear relationship with the output voltage.

Further, the duty ratio of the PWM in the stable phase keeps 100% output, and the output voltage keeps U0 unchanged.

Furthermore, the variable quantity of the output voltage per unit time in the manual regulation stage is constant.

Further, the duty ratio of the PWM in the stable working phase keeps constant at 100% output.

Further, PWM regulation does not work during the manual shutdown phase.

The PWM regulation assists in an automatic starting process, PWM keeps 100% duty ratio output after the switching power supply is started, after the switching power supply is used, the PWM regulation does not work when the switching power supply is turned off, and the voltage of the power supply is reduced according to a set proportion (the voltage variation in unit time). By adopting the technical scheme, the oscillation of distributed inductance and capacitance in the circuit is reduced, the switching loss of the switching power supply is reduced, and the power consumption of the converter is reduced.

Description of the various phases in the control curve of the output voltage controller:

and (3) automatically starting an adjusting stage: as shown in fig. 2, the voltage increases from 0 to U0 and steadily increases at this stage regulated by PWM, and the duty ratio of PWM corresponds to the voltage value one by one, and the relationship between the duty ratio and the voltage is as shown in fig. 2 below. The output voltage of the switching power supply is stably increased in the stage, and internal loss of the switching power supply is avoided.

And (3) a stabilization stage: the duty ratio of the phase is 100% and keeps constant, the output voltage keeps constant at U0, the control circuit has PWM control to switch to manually control the output voltage, and the time of the phase is short.

Manual start-up regulation phase: this stage is the stage of manual regulation power output voltage, and artificial manual roll output voltage controller prevents that different people from rolling speed and dynamics are different, and output voltage's change volume is certain in the settlement unit interval, prevents that the inside regulation of power is disorderly. As shown in fig. 1, the rate of adjustment at this stage remains constant, i.e., the slope of the curve in the graph is constant. When the regulated output voltage reaches the target voltage U1, regulation stops, the voltage is stabilized and the power supply begins to operate normally.

And (3) stabilizing the working stage: the phase is a switching power supply stable output phase, PWM in the phase is still kept unchanged by 100%, and an output voltage controller is kept still.

And (3) manual closing stage: as shown in fig. 1, after the switching power supply is used, the output voltage controller is manually adjusted to reduce the output voltage of the switching power supply to 0V, and then the adjustment is terminated. During adjustment, the output voltage is manually and slowly reduced, and the phenomenon that a capacitor and an inductance element inside the switching power supply oscillate due to instantaneous power failure is avoided, so that the internal loss of the power supply is reduced.

This application improves the optimization to current light-duty low-power's DC/DC switching power supply, and DC/DC switching power supply can only export fixed voltage in the market, has 12V and 24V two kinds respectively, and not only inconvenient use but also switching loss is great, consequently this application improves this kind of switching power supply, adopts the mode that combines automatic start and manual start control, realizes reducing the internal loss when switching power supply starts and shuts off.

The invention discloses a light switching power supply with variable voltage output and low switching loss, which comprises a display, a main control circuit and a detection circuit, wherein the main control circuit is electrically connected with the detection circuit and is provided with an output voltage controller for regulating output voltage; the control curve of the output voltage comprises: the method comprises an automatic starting and adjusting stage, a stabilizing stage, a manual starting and adjusting stage, a stable working stage and a manual closing stage, wherein the automatic starting and adjusting stage adopts a PWM (pulse width modulation) regulation output voltage controller, and the regulation rate of output voltages of the manual starting and adjusting stage and the manual closing stage is constant; the preferable interval of the output voltage U1 in the stable operation stage is: 5-24V and the stability is about 0.25-1 s. The invention realizes the step-up and step-down output of the switching power supply, reduces the oscillation of distributed inductance and capacitance in the circuit and reduces the switching loss.

The present embodiment is only for explaining the invention, and it is not limited to the invention, and those skilled in the art can make modifications of the embodiment as necessary and inventive contribution to the present embodiment after reading the present specification, but all within the protection scope of the invention are protected by patent laws.