CN205160375U - Switch control device for output power - Google Patents

Abstract

The utility model relates to a switch technical field, the utility model provides an export power supply's on -off control device, include: switching element, energy storage module, PWM signal produce module, boost module, feedback module and drive module, feedback module output feedback signal produces the module for the PWM signal, the PWM signal produces the module and adjusts pulse width in real time according to feedback signal to export adjusted pulse width for drive module, boost module steps up back output for drive module with input voltage, drive module according to adjusted pulse width with step up after input voltage regulated output voltage until opening the switching element, connect the energy storage module through the output at the switching element, when making on the switching element electricity, the energy storage module has higher impedance under pulse frequency to realize that the switching element is less at last electric electric current in the twinkling of an eye the time, realized in the system of middle and high voltage heavy current, reduced the parameter requirement to the switching element.

Description

Switch control device for output power

technical field

The utility model relates to the technical field of power switches, in particular to a switch control device for outputting power.

Background technique

With the development of automation technology, especially in the application of robots in industry, the power switch of the entire robot system is usually controlled by relays. However, for small systems, MOSFETs are usually used to power up the system. Compared with the two, relays have high current, high stability, and wide selection. For different applications, different relays can be selected, and MOSFETs are used as the power supply. The switch control device has the characteristics of low cost, small size, no sparking phenomenon, and long service life. The use of MOSFETs as switches for DC power supplies has been very mature in low-voltage, low-current systems. However, in high-voltage and high-current systems, the requirements for the selection of MOSFETs are relatively high.

In the battery-powered system, when the power switch is turned on in the medium and high-voltage power supply system, the instantaneous turn-on current is large, and the peak current can reach tens of amperes, which is a considerable test for the battery protection system. In addition, in the application of non-battery systems, such a large current can cause the front-end power supply to be protected. To sum up, in the prior art, there are problems in the medium and high voltage power supply system that the selection of switching devices is relatively high, and in the non-battery system, the current is too large and the current protection occurs.

Utility model content

The purpose of this utility model is to provide a switch control device for outputting power supply, aiming to solve the problem of high selection requirements for switching devices in the medium and high voltage power supply system in the prior art and the occurrence of current caused by excessive current in non-battery systems. The issue of protection.

The utility model is achieved in this way. The first aspect provides a switch control device for outputting power supply. The switch control device includes: a switch device, an energy storage module, a PWM signal generation module, a boost module, a feedback module and a drive module;

The input end of the switching device is connected to the input end of the boost module and constitutes the voltage input end of the switching control device of the output power supply, the output end of the switching device is connected to the input end of the energy storage module, The output end of the energy storage module is connected to the input end of the feedback module, the output end of the feedback module is connected to the input end of the PWM signal generation module, and the output end of the PWM signal generation module is connected to the drive module. The first input terminal, the output terminal of the boost module is connected to the second input terminal of the driving module, and the output terminal of the driving module is connected to the control terminal of the switching device;

The feedback module outputs a feedback signal to the PWM signal generation module;

The PWM signal generating module adjusts the pulse width in real time according to the feedback signal, and outputs the adjusted pulse width to the driving module;

The boost module boosts the input voltage and outputs it to the drive module;

The driving module adjusts the output voltage according to the adjusted pulse width and the boosted input voltage until the switching device is turned on.

With reference to the first aspect, as a first implementation manner of the first aspect, the switching device is a field effect transistor, a triode or an IGBT.

In combination with the first aspect and its first implementation manner, as a second implementation manner of the first aspect, the switching device is a field effect transistor, and the drain, source and gate of the field effect transistor are respectively the The input terminal, the output terminal and the control terminal of the switching device;

With reference to the first aspect, as a third implementation manner of the first aspect, the energy storage module includes an inductor, a voltage regulator tube, and a capacitor;

The first end of the inductor is commonly connected with the cathode of the voltage regulator tube and forms the input end of the energy storage module, the anode of the voltage regulator tube and the first end of the capacitor are commonly connected with the ground, and the The second end of the capacitor is commonly connected with the second end of the inductor to form an output end of the energy storage module.

The utility model provides a switch control device for outputting a power supply. By connecting an energy storage module at the output end of a switch device, when the switch device is powered on, the energy storage module has a higher impedance at a pulse frequency, thereby realizing the switching device The current at the moment of power-on is small, which realizes that in the medium-high-voltage and high-current system, MOSFET can be used as the power switch of the system, and the parameter requirements for MOSFET are reduced, and there will be no failure due to too fast power-on speed The front-end power adapter is misjudged as an overcurrent protection problem.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the accompanying drawings that are required in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only the practical For some novel embodiments, those skilled in the art can also obtain other drawings based on these drawings without any creative work.

Fig. 1 is a schematic structural diagram of a switching control device for output power provided by an embodiment of the present invention;

Fig. 2 is a circuit diagram of a switching control device for output power provided by an embodiment of the present invention.

detailed description

In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not intended to limit the utility model.

In order to illustrate the technical solution of the utility model, the following specific examples are used for illustration.

An embodiment of the utility model provides a switch control device for outputting a power supply. As shown in FIG. 106 and drive module 103;

The input end of the switching device 105 is connected with the input end of the boost module 102 and constitutes the voltage input end of the switch control device, the output end of the switching device 105 is connected to the input end of the energy storage module 104, and the output end of the energy storage module 104 is connected to the feedback The input end of the module 106, the output end of the feedback module 106 is connected to the input end of the PWM signal generation module 101, the output end of the PWM signal generation module 101 is connected to the first input end of the drive module 103, and the output end of the boost module 102 is connected to the drive module The second input terminal of 103, the output terminal of the driving module 103 is connected to the control terminal of the switching device 105;

The feedback module 106 outputs a feedback signal to the PWM signal generating module 101;

The PWM signal generation module 101 adjusts the pulse width in real time according to the feedback signal, and outputs the adjusted pulse width to the drive module 103;

The boost module 102 boosts the input voltage and outputs it to the drive module 103;

The driving module 103 adjusts the output voltage according to the adjusted pulse width and the boosted input voltage until the switching device 105 is turned on.

As for the switching device 105, specifically, the switching device 105 is a field effect transistor, a triode or an IGBT.

Preferably, the switching device 105 is a field effect transistor Q1, and the drain, source and gate of the field effect transistor Q1 are respectively the input terminal, the output terminal and the control terminal of the switching device 105 .

For the feedback module 106, specifically, the feedback module 106 may use two series resistors to divide the voltage, and then collect the voltage signal through a voltage comparator to obtain the feedback signal.

For the energy storage device, specifically, the energy storage module 104 includes an inductor L1, a voltage regulator tube D1 and a capacitor C1;

The first end of the inductor L1 is connected to the cathode of the voltage regulator tube D1 to form the input end of the energy storage module 104, the anode of the voltage regulator tube D1 and the first end of the capacitor C1 are connected to the ground, and the second end of the capacitor C1 is connected to the ground. The second end of the inductor L1 is commonly connected to form an output end of the energy storage module 104 .

Among them, the role of the energy storage device is to use the conduction pulse current of the MOSFET to make the inductor have a higher impedance at the pulse frequency, so that the current of the switching MOSFET at the moment of power-on is small, and the voltage at both ends of the MOSFET is high at this time. reduce the stress on the MOSFET.

The working process of the switch control device of the present invention is: the enable control input by the drive module 103 is to control whether the power supply is turned on, that is, for the entire system, the enable control is the input of the power switch control signal, and after the enable control signal is input, the system is powered on , the inductance in the energy storage module has a relatively high impedance at the pulse frequency, so that the current of the switching MOSFET is small at the moment of power-on, and the feedback module 106 uses positive feedback to feed back the signal so that the pulse width of the PWM control waveform is higher than that of the previous cycle Wide, so that the output voltage of the driving module 103 rises until it reaches the full turn-on voltage set by the MOSFET, the PWM signal generating circuit no longer works, and the MOSFET is fully turned on. The main function of the boosting module 102 and the driving module 103 is to boost the power supply at the input end and convert the PWM waveform to drive the MOSFET.

The utility model provides a switch control device for outputting a power supply. By connecting an energy storage module at the output end of a switch device, when the switch device is powered on, the energy storage module has a higher impedance at a pulse frequency, thereby realizing the switching device The current at the moment of power-on is small, which realizes that MOSFET can be used as the power switch of the system in the medium-high-voltage and high-current system, and reduces the parameter requirements of MOSFET, and there will be no failure due to too fast power-on speed This leads to the problem that the front-end power adapter misjudged as overcurrent and protection occurred. In addition, in this solution, additional functions such as power-on slope adjustment and overcurrent protection can be realized at the same time.

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For those of ordinary skill in the technical field to which the utility model belongs, those who make several equivalent substitutions or obvious modifications without departing from the concept of the utility model, and have the same performance or use, should be deemed to belong to the utility model submitted by the The scope of patent protection determined by the claims.

Claims (4)

1. a switch controlling device for out-put supply, is characterized in that, described switch controlling device comprises: switching device, energy-storage module, pwm signal generation module, boost module, feedback module and driver module;

The input of described switching device and the input of described boost module connect altogether and form the voltage input end of described switch controlling device, the output of described switching device connects the input of described energy-storage module, the output of described energy-storage module connects the input of described feedback module, the output of described feedback module connects the input of described pwm signal generation module, the output of described pwm signal generation module connects the first input end of described driver module, the output of described boost module connects the second input of described driver module, the output of described driver module connects the control end of described switching device,

Described feedback module output feedback signal gives described pwm signal generation module;

Described pwm signal generation module adjusts pulse duration in real time according to feedback signal, and the pulse duration after adjustment is exported to described driver module;

Described boost module exports to described driver module after being boosted by input voltage;

Described driver module according to the pulse duration after described adjustment and boosting after input voltage regulation output voltage until open described switching device.

2. the switch controlling device of out-put supply as claimed in claim 1, it is characterized in that, described switching device is field effect transistor, triode or IGBT.

3. the switch controlling device of out-put supply as claimed in claim 2, is characterized in that: described switching device is field effect transistor, and the drain electrode of described field effect transistor, source electrode and grid are respectively the input of described switching device, output and control end.

4. the switch controlling device of out-put supply as claimed in claim 1, is characterized in that: described energy-storage module comprises inductance, voltage-stabiliser tube and electric capacity;

The first end of described inductance and the negative electrode of described voltage-stabiliser tube connect altogether and form the input of described energy-storage module, the anode of described voltage-stabiliser tube and the first end of described electric capacity connect altogether with ground, and the second end of described electric capacity and the second end of described inductance connect altogether and form the output of described energy-storage module.