DE102004032497A1 - Switching current supply system for automatically controlling a switching circuit operating frequency in a transformer supplies a direct voltage current to a computer system - Google Patents

Abstract

An oscillator switching circuit (17) emits a signal with a constant frequency on a pulse-width modulation unit (PWMU) (15). A comparator (12) detects an output connection's (OC) direct current (DC) voltage. If voltage from splitting the OC's DC voltage via a voltage divider network (14) is less than a reference voltage (16), i.e. a heavy output load, then the PWMU broadens square output waves. An independent claim is also included for a method for automatically controlling a switching circuit operating frequency in a transformer for supplying a direct voltage current to a computer system.

Description

The The invention relates to a switching power supply system for automatic Regulating a circuit operating frequency and the method thereto, and in particular a switching power supply system, that for a computer system is set up and capable of having a circuit operating frequency to regulate automatically and the procedure to do so.

With reference to 1 Fig. 12 is a schematic block diagram of a conventional switching power supply system. The switching power supply system employs pulse width modulation (PWM) technology for controlling a power switch (not shown) in a DC-DC converter 11 and supplies power through a filtering network 13 through to the system.

According to the pulse width modulation (PWM) technology provides an oscillator circuit 17 a signal with a costly frequency at a pulse width modulation unit 15 ready. Meanwhile, a comparator detects 12 the DC voltage at the output terminal. If the voltage, by dividing the DC voltage at the output terminal by means of a voltage divider network 14 is obtained, smaller than a reference voltage 16 That is, if the output load becomes heavy, then output square waves will be from the pulse width modulation unit 15 widened, which means that a duty cycle of the power switch (not shown) is increased. This provides compensation for the output voltage so that the output voltage is brought back to the original nominal value and therefore the output voltage can be stabilized.

Similarly, if the load becomes small, the comparator becomes 12 then detect that the voltage generated by dividing the DC voltage at the output terminal by means of the voltage divider network 14 is greater than the reference voltage 16 , and therefore the duty cycle of the output square waves of the pulse width modulation unit 15 reduce, which means that the duty cycle of the power switch is reduced. As a result, the output DC voltage is reduced to the original nominal value and therefore stabilized. In this circuit, the operating frequency of the power switch (not shown) does not vary with the change of the duty ratio. In other words, the circuit operating frequency always remains constant.

At present becomes Pulse Width Modulation (PWM) technology in a computer system to provide power for the operation a central processing unit (CPU) is needed used. From the reason described above remains the operating frequency of the pulse width modulation (PWM) in a power supply system for the central processing unit (CPU) always constant and can not be changed after the design is done has been.

Consequently, can the operating frequency of the pulse width modulation PWM, if once the design completely is not out in response to any current load variation the run a software by any execution of a central processing unit (CPU), environment changes inside Outside of the housing and voltage changes, caused by the power supply or the load results, changed become. Therefore it is impossible, anything to improve the operating efficiency of the pulse width modulation PWM, the reduction of switching losses, the suppression of System temperature, the improvement of sawtooth current and reduction contribute to the peak-to-peak ripple voltage. consequently the output voltage and the whole system are unstable and the Efficiency of the components can not be maximized, what the performance of the computer.

in view of of the above, this invention discloses a switching power supply system for automatically regulating a circuit operating frequency and the method for providing a switching power supply system and a method for dynamically increasing or decreasing a Operating frequency of a computer system. This invention has excellent Effects in improving the operating efficiency of pulse width modulation PWM, the reduction of switching losses, the suppression of System temperature, the improvement of sawtooth current and reduction the peak-to-peak ripple voltage on.

In this invention, a scanning and monitoring unit connected to the computer system detects the model number of the central processing unit (CPU), the power consumption of the central processing unit (CPU), the temperature change inside / outside the housing or at a predetermined point, voltage changes and Load changes in the computer system and generates a detection value. The detection value is then transmitted to a comparator unit connected to the sampling and monitoring unit. Then, the comparator unit compares the detection value with a trigger state value stored in a memory unit, and outputs a comparison result signal to a PWM switching frequency regulation unit. The trigger state value stored in the storage unit becomes from a setting operation by means of a setting received.

In the above description enlarged or reduced the PWM switching frequency regulating unit the operating frequency of the Pulse width modulation PWM dynamically based on the comparison result signal, allowing the converter to deliver power to the computer system more efficiently can.

In the switching power supply system for automatically regulating a Circuit operating frequency and the method thereto according to a embodiment of this invention, the PWM switching frequency regulating unit can dynamic monitoring the operating state change of Computer system by means of the sampling and monitoring unit, if the change in condition exceeds a preset trigger value, the operating frequency the pulse width modulation PWM based on the comparison result signal dynamically enlarge or shrink, so that the transducer in response to the changing Environment can efficiently supply power to the computer system.

characteristics and advantages of this invention will become apparent from the following detailed Description completely understood when combined with the embodiment as it is in the accompanying drawings, taken in all references to be considered as illustrative and not restrictive, in which:

1 schematically illustrates a block diagram of the conventional switching power supply system;

2 schematically illustrates a block diagram of the switching power supply system for automatically regulating a circuit operating frequency according to an embodiment; and

3 Fig. 10 is a flowchart for explaining the method of automatically regulating a circuit operating frequency according to the embodiment of this invention.

With reference to 2 12 is a schematic block diagram of the switching power supply system for automatically regulating a circuit operating frequency according to one embodiment. The switching power supply system for automatically regulating a circuit operating frequency 2 for regulating an operating frequency of a converter 3 for supplying a DC power to a computer system 4 is used, has a sampling and monitoring unit 24 , a comparator unit 26 , a PWM switching frequency regulating unit 27 , a storage unit 28 and an adjustment unit 29 on.

Relegated to 2 , detects the scanning and monitoring unit 24 that with the computer system 4 is connected, an operating state of the computer system 4 and outputs a detection value. The adjustment unit 29 connected to the storage unit 28 is used to set a trigger state value and store the trigger state value in the memory unit 28 used. In the above description, the trigger state value serves as a trigger state value for regulating the operating frequency. The comparator unit 26 connected to the scanning and monitoring unit 24 and the storage unit 28 for receiving the detection value from the sampling and monitoring unit 24 and the trigger state value stored in the memory unit 28 is stored, performs a comparison operation, and outputs a comparison result signal. The PWM switching frequency regulating unit 27 that with the comparator unit 26 and the converter 3 is connected receives the comparison result signal from the comparator unit 26 and dynamically and automatically increases or decreases the operating frequency of the pulse width modulation PWM based on the comparison result signal, so that the converter 3 Stream more efficient to the computer system 4 can deliver.

Relegated to 2 , has the sensing and monitoring unit 24 a sensor (not shown) and a monitoring module (not shown). The sensor may be a voltage sensor, a current sensor, a temperature sensor, a load sensor or the like. The monitoring module may be a voltage monitoring module, a current monitoring module, a temperature monitoring module, a load monitoring module or the like. The scanning and monitoring unit 24 is through the sensor with a key point (not shown) in the computer system 4 connected to the operating state of the computer system 4 to detect. The monitoring module interacts with the sensor so that the voltage, current, temperature or program load in the computer system 4 be dynamically monitored and then dynamically provide an indication of the status change to the system.

In the above description, the sampling and monitoring unit 24 consist of a combination of at least one sensor (not shown) and at least one monitoring module (not shown). The sensor may be a voltage sensor, a current sensor, a temperature sensor, a load sensor or the like. The monitoring module may be a voltage monitoring module, a current monitoring module, a temperature monitoring module, a load monitoring module or the like. The scanning and monitoring Ness 24 is through these sensors with multiple key points in the computer system 4 connected to the environment changes for the computer system 4 to detect with a greater sensitivity. The monitoring module interacts with the corresponding sensors so that the voltage, current, temperature and program load in the computer system 4 be dynamically monitored and then dynamically provide status updates to the system.

Again with reference to 2 , the trigger state value may be determined by the adjustment unit 29 be set by a user when the system is turned on. Further, a combination of a plurality of trigger state values may be set in accordance with different requirements. The trigger state values are in the memory unit 28 saved. In the subsequent process, the comparator unit compares 26 in the system, the trigger state values set by the user with the detection values indicating the system status and output from the sensors to determine whether to increase or decrease the operating frequency of the pulse width modulation (PWM) ,

In each operating system, the system automatically increases the operating frequency of the pulse width modulation (PWM) as required by the computer system as required 4 is required to run a program with a large load, or a program to be executed for a long period of time. When the system returns to a normal state or when the program is terminated, the PWM operating frequency is reset to the original operating frequency. During operation, it is not necessary to use any software for switching the frequency nor is it necessary to use the computer system 4 reset. No program running on the computer is adversely affected by the switching process.

The invention may use a single temperature monitor having a temperature sensor and a temperature monitor module. When the temperature of a power switch MOS in the pulse width modulation PWM for controlling the converter 3 is overheated, the system will automatically reduce the operating frequency of the pulse width modulation PWM, so that the temperature of the power switch MOS can be reduced. When the temperature of a power switch MOS in the pulse width modulation PWM for controlling the converter 3 falls below a preset temperature, the pulse width modulation PWM is operated at a higher switching frequency. This invention is advantageous because of its short response time and high compatibility. In addition, stability and efficiency can be maximized since it is allowed to modify or adjust the sensor under all types of operating systems without the computer system 4 reset.

With reference to 3 FIG. 12 is a flowchart for explaining the method of automatically regulating a circuit operating frequency according to the embodiment of this invention. The method of automatically regulating a circuit operating frequency of the invention has the steps described below. First, the operation of a sampling and monitoring unit is started (S100). Next, a trigger state value for regulating the circuit operating frequency is set (S102). Then, an operating state of a computer system is dynamically detected and monitored, and a detection value is obtained for the operating state of the computer system (S104). Further, the trigger state value is dynamically compared with the operational state detection state of the computer system (S106). Finally, the circuit operating frequency of the converter is dynamically regulated by a PWM switching frequency regulation unit based on a comparison result S108.

With reference to both 2 as well too 3 , has the sensing and monitoring unit 24 a sensor (not shown) and a monitoring module (not shown). The sensor may be a voltage sensor, a current sensor, a temperature sensor, a load sensor or the like, or a combination of any of these sensors. Each sensor works with a corresponding monitoring module to check the status of the computer system 4 to monitor dynamically and accordingly outputs a detection value. The monitoring module may be a voltage monitoring module, a current monitoring module, a temperature monitoring module, a load monitoring module or the like.

In the above step of setting the trigger state, the trigger state value may be set as a trigger state value for a single sensor, or it may also be set as at least one trigger state value for at least one sensor. In addition, the trigger state value may be set as a factory default value and before being sent to users in the memory unit 28 of the computer system, or it may also be set to a desired value by a user, and prior to turning on the computer system in the memory unit 28 of the computer system.

In the step of dynamic regulation In accordance with the operating frequency of the converter, the system compares the trigger state value set by the user with the detection value of the sensing and monitoring unit 24 for determining how to regulate the operating frequency of the pulse width modulation PWM; that is, whether the operating frequency of the pulse width modulation PWM must be increased or decreased. Undoubtedly, if the operating state does not exceed the preset trigger state value, then the operating frequency of the pulse width modulation PWM is maintained at a constant rate.

As described above, the switching power supply system for automatically regulating a circuit operating frequency and the method thereof according to this invention provide a switching power supply system and a method for dynamically increasing or decreasing an operating frequency of the computer system 4 , This invention has excellent effects for improving the operating efficiency of the pulse width modulation PWM, reducing the switching loss, suppressing the system temperature, improving the sawtooth current and decreasing the peak-to-peak ripple voltage.

While these Invention with reference to the detailed description and the Drawings of the preferred embodiment has been described, it is to be understood that the invention not to be understood as limited thereby. Various Modifications and changes could devised by those skilled in the art without departing from the scope of this invention, the one attached by claims is displayed, to move away.

Claims (13)

Switching power supply system ( 2 ) for automatically regulating a circuit operating frequency of a converter ( 3 ) for supplying a direct current to a computer system ( 4 ), comprising: a sampling and monitoring unit ( 24 ) connected to the computer system ( 4 ) for detecting an operating state of the computer system ( 4 ) and outputting a detection value; a setting unit ( 29 ) for setting a trigger state value for regulating the circuit operating frequency; a storage unit ( 28 ) connected to the setting unit ( 29 ) for storing the trigger state value; a comparator unit ( 26 ) connected to the storage unit ( 28 ) and the sampling and monitoring unit ( 24 ) for comparing the detection value with the trigger state value and outputting a comparison result signal; and a PWM switching frequency regulating unit ( 27 ) associated with the comparator unit ( 26 ) and the converter ( 3 ) for receiving the comparison result signal and regulating the circuit operating frequency of the converter ( 3 ) based on the comparison result signal. A switching power supply system for automatically regulating a circuit operating frequency according to claim 1, wherein the sampling and monitoring unit ( 24 ) has at least one sensor and at least one monitoring module. Switching power supply system for automatic regulation A circuit operating frequency according to claim 2, wherein the sensor any combination of a voltage sensor, a current sensor, a temperature sensor and a load sensor. Switching power supply system for automatic regulation A circuit operating frequency according to claim 2, wherein the monitoring module any combination of a voltage monitoring module, a current monitoring module, a temperature monitoring module and a load monitoring module is. A switching power supply system for automatically regulating a circuit operating frequency according to claim 1, wherein the sampling and monitoring unit ( 24 ) has a sensor and a monitoring module. Switching power supply system for automatic regulation A circuit operating frequency according to claim 5, wherein the sensor a voltage sensor, a current sensor, a temperature sensor or a load sensor is. Switching power supply system for automatic regulation A circuit operating frequency according to claim 5, wherein the monitoring module a voltage monitor module Current monitoring module, a temperature monitoring module or a load monitoring module is. Method for automatically regulating a circuit operating frequency of a converter ( 3 ) for supplying a DC power to a computer system ( 4 ), comprising the steps of: starting the operation of a sampling and monitoring unit (S100); Setting a trigger state value for regulating the circuit operating frequency (S102); Dynamically sampling and monitoring an operating state of the computer system and obtaining a detection state of the operating state of the computer system (S104); Dynamic comparison of the trigger state value with the operating system status of the computer system (S106); and dynamically adjusting the circuit operating frequency of the converter by a PWM switching frequency regulation unit based on a comparison result (S108). Method for automatically regulating a circuit operating frequency according to claim 8, wherein the step of setting the trigger state value (S102) setting a single trigger state value for a having individual sensor. Method for automatically regulating a circuit operating frequency according to claim 8, wherein the step of setting the trigger state value (S102) setting at least one trigger state value for at least has a sensor. A method of automatically controlling a circuit operating frequency according to claim 8, wherein the step of setting the trigger state value (S102) includes setting and storing the trigger state value in a memory unit (14). 28 ) of the computer system ( 4 ) as a factory default value. A method of automatically controlling a circuit operating frequency according to claim 8, wherein the step of setting the trigger state value (S102) includes setting a trigger state value by a user and storing the trigger state value in a memory unit (S102). 28 ) of the computer system ( 4 ) before turning on the computer system ( 4 ) having. Method for automatically regulating a circuit operating frequency according to claim 8, wherein the step of dynamically regulating the circuit operating frequency the converter (S108), regulating the reduction or enlargement of the Operating frequency has.