JPWO2009133723A1 - Switching power supply system - Google Patents

Abstract

The LED lighting device (101) includes a switching power supply device (100) that converts an input power supply voltage input from the input power supply (1) and supplies a predetermined voltage / current to the load (LED4). ing. The switching power supply device (100) drives the power conversion circuit (10) that performs power conversion by switching the switching element (Q1), the programmable device (2) that controls the switching element (Q1), and the switching element (Q1). A driver circuit (3) is provided. The programmable device (2) is a DSP with a built-in flash memory, for example. The personal computer (20) generates a code of a switching control program to be executed by the programmable device (2), and writes the code to the flash memory in the programmable device (2) via the writer (21).

Description

  The present invention relates to a switching power supply system including a switching power supply apparatus that controls a switching element by a programmable device and a device that generates a control program thereof.

  Conventionally, Patent Documents 1 and 2 disclose switching power supply devices that convert an input power supply voltage into a predetermined voltage to be applied to an LED that is a load.

Both Patent Documents 1 and 2 relate to a reduction in loss in the voltage conversion circuit. In Patent Documents 1 and 2, the current flowing to the LED is controlled by a switching device, and this current is detected by a resistor or the like to perform feedback control A configuration for performing is shown.
Japanese Patent Application Laid-Open No. 2005-116738 JP 2007-1891004 A

  In a switching power supply device that obtains a predetermined output voltage or output current by switching control as shown in Patent Documents 1 and 2, the input voltage, output voltage, and current are changed according to the required specifications of the lighting device. Therefore, when designing lighting devices with different specifications, it is necessary to change the circuit constants each time. Therefore, it is necessary to review and redesign the lighting device driven by switching control and its power supply device (power supply circuit). This has been done as a matter of course.

  However, for example, the proportion of the design cost of the circuit has been increasing with the increase in the characteristics and types of the LEDs that are loads, or with the increase in specifications and models of the entire lighting device including the switching power supply circuit.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a switching power supply apparatus and its control program generation apparatus that can change the characteristics and specifications of the apparatus without changing circuit constants each time.

In order to solve the above-described problems, the present invention is configured as follows.
(1) A switching power supply in a switching power supply system of the present invention includes a power conversion circuit that converts voltage or current by switching of a switching element, and a switching control means that controls the switching element. In the apparatus, the switching control means includes a storage area for the switching control program, a program writing means for writing the switching control program to the storage area from the outside, and execution of the switching control program written to the storage area. Program execution means for outputting a control signal is provided.

  The switching power supply device control program generation device in the switching power supply system according to the present invention is characterized in that the characteristic parameter of the switching power supply device is input to the storage area based on the characteristic parameter input means and the characteristic parameter. And a program code generation means for generating a code of the switching control program.

  This configuration facilitates design changes due to changes in input voltage or load. For example, it is possible to respond without changing the circuit according to changes in destinations with different input power supply voltages or changes in LEDs with different power to be supplied.

It is also possible to change the specifications of the circuit of a product that has already been produced or has been produced without removing the parts.
In addition, since it is not necessary to change the parts to be mounted, it is excellent in economic efficiency during mass production.

  Furthermore, the same power conversion circuit can be sold to many customers such as assembly manufacturers, and each customer can reflect their specifications on the circuit.

(2) Further, in the control program generation device of the switching power supply apparatus, the characteristic parameter input means displays the input field of the characteristic parameter in response to a request from a WEB browser of a personal computer via the Internet. It is program execution means on the WEB server side that reads input data, and the program code generation means generates a code of a switching control program based on the characteristic parameter and transmits it via the Internet.

  In this way, using the Internet, etc., the network and design software are linked, and the customer sends the desired specifications via the network to the server on which the design software is installed, and the customer satisfies the specifications from the server. Can be obtained.

  According to the present invention, the design change by changing the input voltage or the load becomes easy. In addition, the specifications can be changed without replacing circuit parts, and the economy at the time of mass production is excellent. Furthermore, since the specifications unique to each customer such as an assembly maker can be reflected in the circuit, the circuit maker only needs to manufacture many identical power conversion circuits, and the cost can be reduced accordingly.

It is a circuit diagram of the switching power supply concerning a 1st embodiment, and an LED lighting device provided with the same. It is a flowchart which shows the process sequence which the personal computer 20 shown in FIG. 1 performs. FIG. 5 is a system block diagram according to a second embodiment in which program code generation means is provided on the WEB server side accessible via the Internet. It is a flowchart which shows the process sequence by the WEB browser which the client PC30 side in FIG. 3 performs, and the process sequence by the WEB server which the server PC31 side performs.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Input power source 2 ... Programmable device 3 ... Driver circuit 4 ... LED
DESCRIPTION OF SYMBOLS 10 ... Power conversion circuit 20 ... Personal computer 21 ... Writer 30 ... Client PC
31 ... Server PC
DESCRIPTION OF SYMBOLS 100 ... Switching power supply device 101 ... LED lighting apparatus Co ... Capacitor D1 ... Diode L1 ... Coil Q1 ... Switching element R1, R2, R3, R4, R5 ... Resistance

<< First Embodiment >>
In the first embodiment, an LED lighting device is given as an example of the switching power supply system of the present invention.
FIG. 1 is a circuit diagram of a switching power supply device 100 according to the first embodiment and an LED lighting device 101 including the same. The LED lighting apparatus 101 includes a switching power supply apparatus 100 that converts an input power supply voltage input from the input power supply 1 and supplies a predetermined voltage / current to the LED 4 that is a load.

  The switching power supply apparatus 100 includes a power conversion circuit 10 that performs power conversion by switching of the switching element Q1, a programmable device 2 that controls the switching element Q1, and a driver circuit 3 that drives the switching element Q1.

  The power conversion circuit 10 constitutes a step-down chopper circuit including a coil L1, a capacitor Co, and a diode D1.

  A circuit composed of resistors R4 and R5 is a circuit that detects an input power supply voltage of the input power supply 1, and the programmable device 2 inputs a detection voltage of the input power supply voltage detection circuit. Similarly, a circuit composed of resistors R2 and R3 is a circuit that detects an output voltage to the LED 4, and the programmable device 2 inputs a detection voltage of the output voltage detection circuit. The resistor R1 detects a current flowing through the LED 4, and the programmable device 2 inputs a voltage drop caused by the resistor R1.

  The programmable device 2 includes, for example, a flash memory as a storage area, and a DSP (digital signal processor) incorporating program execution means for outputting a control signal for the switching element Q1 by executing a switching control program written in the flash memory. By connecting the writer 21 to the outside, a program can be written in the flash memory. The programmable device 2 and the driver 3 correspond to “switching control means” according to the present invention.

  The personal computer 20 includes program code generation means for generating a code of a switching control program to be executed by the programmable device 2 by processing to be described later, and the generated program code is stored in the flash memory in the programmable device 2 via the writer 21. Write to. The writer 21 corresponds to “program writing means” according to the present invention. The personal computer 20 corresponds to “characteristic parameter input means” and “control program generation device” according to the present invention.

  FIG. 2 is a flowchart showing a processing procedure executed by the personal computer 20 shown in FIG. First, input of characteristic parameters of the switching power supply apparatus 100 is read (S1). Here, the characteristic parameter is, for example, distinction between constant voltage control and constant current control, output voltage value when the LED 4 as a load is controlled at constant voltage, and output current when constant current control is performed. Value, etc., and the contents of these input operations by the user are read.

  Next, a program source corresponding to the controlled object is selected (S2). The design software selects the optimum program source for the one set by the user from the program sources stored in advance. For example, in the constant voltage control, the program source is selected depending on which range the output voltage is included.

  Subsequently, in order to perform control to stabilize the output voltage value or output current value read in step S1 and the corresponding control parameter (for example, the output voltage value or output current value is set as set). Some necessary control values) are written in a data table or the like referred to by the program or written in the program. (S3). The “control parameter” in step S3 is not a “characteristic parameter” of the switching power supply, but is data to be referred to when the switching control program is executed.

  After that, compilation is performed by starting the compiler based on the program source selected in step S2 and the control parameters set in step S3. Subsequently, assembly is performed by starting the assembler, and then link is performed by starting the linker. Do. As a result, an execution file of the switching control program (program code to be executed by the programmable device 2 shown in FIG. 1) is generated (S4 → S5 → S6 → S7).

  Note that the execution file (program code) is not limited to the above-described procedure of compiling, assembling, and linking. For example, a common program is prepared in advance, and the characteristic parameters set by the user are used as control parameters. It is also possible to convert the control parameter and execute the switching control while referring to the control program.

  In this way, after the switching control program is written in the flash memory in the programmable device 2 shown in FIG. 1, the connection of the writer 21 is disconnected. When the programmable device 2 is executed in the normal mode, the programmable device 2 operates as a switching power supply device having a predetermined characteristic specified by the characteristic parameter and a lighting device including the switching power supply device.

<< Second Embodiment >>
In the first embodiment, an example in which a personal computer equipped with program code generation means is provided on the assembly manufacturer side is shown. However, in the second embodiment, this program code generation means can be accessed via the Internet. It is provided on the WEB server side.

  FIG. 3 is an overall system block diagram. The client PC 30 includes means for executing a WEB browser. The server PC 31 is provided with means for executing a WEB server program. The server PC 31 publishes a page that accepts input of characteristic parameters of the switching power supply device by a predetermined URL on the Internet by executing the WEB server program of the server PC 31. The client PC 30 can give the characteristic parameter of the switching power supply device to the server PC 31 by input or selection in a page displayed by accessing the predetermined URL through the Internet. The server PC 31 generates a switching control program code based on this characteristic parameter, and transmits it to the client PC 30 via the Internet. Alternatively, the switching control program code is downloaded from the client PC 30 side.

FIG. 4 is a flowchart showing a processing procedure by the WEB browser executed by the client PC 30 side and a processing procedure by the WEB server executed by the server PC 31 side.
The WEB browser first accesses a predetermined URL, reads an HTML file from the site, and displays a page (S11 → S12). The above page is provided with a value input field for various characteristic parameters of the switching power supply device, and a selection item check box or radio button selection section, which reads characteristic parameters input by user key operations, mouse operations, etc. These are transmitted to the site (S13 → S14). Thereafter, the code of the switching control program generated by executing the WEB server program of the server PC 31 is downloaded (S15).

  The WEB server side first transmits an HTML file or the like in response to a browse request from the client PC 30 (S21). Then, the characteristic parameter of the switching power supply device inputted by the user is received by executing the CGI and the function of the WEB browser (S22). Then, a control program code is generated in the same manner as the processing procedure shown in FIG. 2 (S23). Thereafter, the control program code is transmitted in response to the download request from the client (S24).

  In this way, the program code generating means is provided on the server PC 31 side, and the program code for functioning as a switching power supply device having predetermined characteristics is obtained on the client PC 30 side via the Internet.

  According to the system shown in the second embodiment, the design software body corresponding to the “program code generation means” according to the present invention is not distributed to a user (customer) such as an assembly maker, and the user side By the operation, the user can obtain the code of the switching control program. Moreover, the manufacturer supplying the circuit of the switching power supply device provides the design software body and facilitates customer management.

  In addition, although the step-down chopper type switching power supply device is illustrated in FIG. 1, it goes without saying that it can be similarly applied to various types of switching power supply devices. Further, the LED of the LED lighting device is taken as an example of the load of the switching power supply device.

Claims (2)

A switching power supply comprising a power conversion circuit that converts voltage or current by switching of the switching element, a switching control means for controlling the switching element, and a control program generation device for the switching power supply A switching power supply system,
The switching control means includes a storage area for the switching control program, a program writing means for writing the switching control program to the storage area from the outside, and a control signal for the switching element by executing the switching control program written to the storage area. Program execution means for outputting,
The control program generation device for the switching power supply device includes a characteristic parameter input means for inputting a characteristic parameter of the switching power supply device, and a program for generating a code of the switching control program to be written to the storage area based on the characteristic parameter A switching power supply system comprising: a code generation unit; The characteristic parameter input means is a program execution means on the WEB server side that displays the input field of the characteristic parameter in response to a request from a WEB browser of a personal computer via the Internet and reads input data in the input field.
The switching power supply system according to claim 1, wherein the program code generation means generates a switching control program code based on the characteristic parameter and transmits the generated code through the Internet.

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