TWM458051U - Constant power supply device - Google Patents

Description

Constant power supply unit

This creation is related to a power supply unit, and more specifically to a constant power supply unit.

According to the constant power supply device, a load (for example, a light-emitting diode chip or a rechargeable battery) that needs to supply a constant power is connected to provide a predetermined power of electric energy to the load. Conventional fixed power supply devices can only provide a combination of operating voltage and operating current to the load. However, conventional power supply units cannot be applied to the same power but different operating voltages and operating current loads. Taking the light-emitting diode chip as an example, the current market of light-emitting diode chips has a wide range of specifications. For a light-emitting diode chip having the same power, a combination of operating voltage and operating current is various, and a 28W light-emitting diode is used. For example, the combination of the operating voltage and the operating current is 80V/350mA, 56V/500mA, 40V/700mA, etc. Therefore, in order to drive the LED package of such multiple specifications, the current method is for each type. A light source device is developed for a light emitting diode chip. However, for the manufacturer of the light-emitting diode lighting system, each power LED chip needs to manufacture several power supply devices, which not only increases the pressure of the power supply device inventory, but also cannot be priced. Manufacturing costs remain high. Therefore, the design of the conventional fixed-power power supply device is still not perfect, and there is room for improvement.

In view of this, the main purpose of this creation is to provide a constant power supply device that can be applied to loads of the same power but different combinations of operating voltage and operating current.

In order to achieve the above objective, the constant power supply device provided by the present invention is disposed between a power source and a load for controlling the power supplied to the load within a predetermined power range, including a drive. The unit, a voltage detecting unit and a feedback control unit. The driving unit is electrically connected to the power source and the load for receiving power of the power source and outputting a working voltage and an operating current to the load; a voltage detecting unit is electrically connected to the driving unit for detecting a voltage value of the working voltage; the feedback control unit is electrically connected to the voltage detecting unit and the driving unit, and the feedback control unit is pre-set with at least three reference voltage values, and a value is formed between adjacent two reference voltage values a voltage section, each of the voltage sections corresponding to a slope parameter, wherein the feedback control unit is configured according to a voltage value of the operating voltage measured by the voltage detecting unit and a slope parameter of a voltage section to which the voltage value of the working voltage belongs. And outputting a current control signal to the driving unit to control a current value of the working current outputted to the load, wherein a product of the current value of the working current and the voltage value of the working voltage is within a range of the preset power.

Thereby, the fixed power supply device can be applied to loads having the same power but different working voltages and operating currents, and maintaining the power supplied to the load within a preset power range. Effectively improving the conventional fixed-power power supply device can only be applied to the inconvenience of a single working voltage and a working current load.

10‧‧‧Power supply

20‧‧‧Light Diode Wafer

30‧‧‧Drive unit

40‧‧‧Fixed power adjustment module

42‧‧‧Voltage detection unit

44‧‧‧current detection unit

46‧‧‧Return control unit

462‧‧‧ comparator

464‧‧‧Signal Generator

V1, V2, V3, V4‧‧‧ reference voltage values

Vmax‧‧‧ upper limit voltage value

Imax‧‧‧ upper limit current value

S‧‧‧Voltage section

C‧‧‧ Curve

1 is a block diagram of a light-emitting diode lighting system using a constant power supply device of the preferred embodiment of the present invention; FIG. 2 is a graph showing the relationship between operating voltage and operating current in the preferred embodiment of the present invention.

In order to explain the present invention more clearly, the following embodiments are described in detail with reference to the drawings. FIG. 1 shows an illumination system having the power supply device of the present invention. The load of the embodiment is exemplified by a light-emitting diode chip 20, which includes a driving unit 30 and a certain power adjustment. Module 40. The driving unit 30 is electrically connected to a power source 10 and the LED chip 20 for receiving the power of the power source 10 and outputting a working voltage of DC and an operating current to the LED chip 20; The driving unit 30 can controllably change the voltage value of the operating voltage and the current value of the operating current. In practice, the drive unit 30 can be designed based on circuits of the PWM, half bridge, Buck, Boost, and the like.

The constant power adjustment module 40 includes a voltage detecting unit 42 , a current detecting unit 44 and a feedback control unit 46 . among them: The voltage detecting unit 42 is electrically connected to the driving unit 30 for detecting the voltage value of the operating voltage of the driving unit 30 for the LED chip 20 . The current detecting unit 44 is electrically connected to the driving unit 30 for detecting the current value of the operating current supplied by the driving unit 30 to the LED chip 20 .

The feedback control unit 46 includes a comparator 462 and a signal generator 464 electrically connected. The comparator 462 is electrically connected to the voltage detecting unit 42 and the current detecting unit 44. The signal generator 464 The drive unit 30 is electrically connected. As shown in FIG. 2, in the embodiment, the comparator 462 is pre-configured with four different reference voltage values V1, V2, V3, and V4, and each of the reference voltage values corresponds to a current value of an operating current. A voltage section S is formed between adjacent two reference voltage values, and the three straight lines formed by the three voltage sections S are close to an ideal working voltage-operating current relationship C, the ideal working voltage - The product of the operating current is a preset power. The reference voltage value V1 (the largest of the reference voltage values) is defined as an upper limit voltage value Vmax; and the current value of the operating current corresponding to the reference voltage value V4 (the smallest of the reference voltage values) is an upper limit. Current value Imax. The straight line of each of the voltage segments S has a slope, and the absolute values of the slopes of the voltage segments S are sequentially decreased according to the order of the reference voltage values V1, V2, V3, and V4, that is, The absolute value of the slope of the voltage section S of the reference voltage value V1 - the reference voltage value V2 is the largest, and the absolute value of the slope of the voltage section S of the reference voltage value V3 - the reference voltage value V4 is the smallest. Each slope corresponds to a slope parameter For example, the slope parameters are preset in the comparator 462; and the comparator 462 can output a corresponding slope signal corresponding to each of the slope parameters.

The signal generator 464 is configured to receive the slope signal, and calculate the voltage value of the slope signal and the operating voltage to output a current control signal to the driving unit 30. After receiving the current control signal, the driving unit 30 is configured according to the The current control signal correspondingly changes the current value of the operating current output to the LED chip 20.

When the LEDs 20 having the same power as the preset power are connected to the driving unit 30, the voltage detecting unit 42 detects the voltage of the operating voltage of the driving unit 30 for the LEDs 20 value. The comparator 462 determines the voltage segment S to which the voltage value of the operating voltage belongs according to the voltage value of the operating voltage measured by the voltage detecting unit 42 and obtains the voltage segment S to which the voltage value corresponding to the operating voltage belongs. The slope parameter is used to output the corresponding slope signal. The signal generator 464 outputs a corresponding current control signal to the driving unit 30 according to the voltage value of the working voltage and the received slope signal, so that the driving unit 30 outputs the operating current to the LED chip 20 . The product of the current value and the voltage value of the operating voltage is within the range of the preset power. That is, the current value of the operating current required for the preset power is calculated by using the voltage value of the operating voltage and the slope of the line of the associated voltage segment S. Preferably, the preset power ranges from 90% to 110% of the preset power (ie, between the preset powers and ±10%). For example, the preset power is 28W, and the working current is Multiplying the current value by the voltage value of the operating voltage The product is between 25.2W and 30.8W.

In addition, when the comparator 462 determines that the voltage value of the operating voltage is higher than the upper limit voltage value Vmax, the comparator 462 sends a voltage limiting signal to the signal generator 464, and the signal generator 464 receives the voltage limiting signal. Thereafter, a highest voltage control signal is outputted to the driving unit 30 to limit the voltage value of the operating voltage outputted to the LED chip 20 to be equal to the reference voltage value V1. Thereby, the abnormality of the operating voltage outputted by the driving unit 30 can be avoided, and the LED body 20 is damaged.

When the comparator 462 determines that the current value of the operating current is higher than the upper limit current value Imax, the comparator 462 sends a current limiting signal to the signal generator 464, and the signal generator 464 receives the current limiting signal and outputs the current limiting signal. A highest current control signal is sent to the driving unit 30 to limit the voltage flow outputted to the operating voltage of the LED chip 20 to be equal to the upper limit current value Imax, to prevent the output current from being abnormal, and the LED body 20 is damaged. .

In the above embodiment, the LED power source 20 is used as an example to describe the power supply device of the present invention. In addition to the LED chip 20, other electronic products requiring constant power operation, such as a rechargeable battery, The power supply unit of this creation can also be used.

The fixed power supply device of the present invention utilizes the relationship between the plurality of voltage segments S and the operating current to form an ideal working voltage-operating current curve C, and even if the load of different working voltages is replaced, the supply to the load can be changed accordingly. Operating current, maintaining the power supplied to the load at a preset power Within the range, the effect of constant power is achieved. Effectively improving the conventional power supply device can only be applied to the inconvenience of a single working voltage and a working current load. When the preset voltage segment S is more, the range of the preset power output is closer to the ideal value.

The above description is only for the preferred embodiment of the present invention, and is not all embodiments of the present invention. Changes in the equivalent structure of the application specification and the scope of the patent application are intended to be included in the scope of the patent.

10‧‧‧Power supply

20‧‧‧Light Diode Wafer

30‧‧‧Drive unit

40‧‧‧Fixed power adjustment module

42‧‧‧Voltage detection unit

44‧‧‧current detection unit

46‧‧‧Return control unit

462‧‧‧ comparator

464‧‧‧Signal Generator

Claims (7)

A constant power supply device is disposed between a power source and a load for controlling the power supplied to the load within a predetermined power range, and includes: a driving unit electrically connected to the power source and The load is used to receive the power of the power source and output a working voltage and an operating current to the load; a voltage detecting unit electrically connected to the driving unit for detecting the voltage value of the working voltage; and The control unit is electrically connected to the voltage detecting unit and the driving unit, and the feedback control unit is pre-configured with at least three reference voltage values, and a voltage segment is formed between adjacent two reference voltage values, and each of the voltage regions The segment corresponds to a slope parameter, and the feedback control unit outputs a current control signal to the driving according to the voltage value of the working voltage measured by the voltage detecting unit and the slope parameter of the voltage segment to which the voltage value of the working voltage belongs. The unit controls a current value of an operating current output to the load, wherein a product of a current value of the working current and a voltage value of the working voltage is in a range of the preset power Inside. The constant power supply device of claim 1, wherein when the feedback control unit determines that the voltage value of the operating voltage is higher than an upper limit voltage value, the feedback control unit outputs a voltage control signal to the driving unit to control The voltage value of the operating voltage output to the load is equal to the largest of the reference voltage values. The power supply device of claim 2 includes a current detecting unit electrically connected to the driving unit and the feedback control unit for detecting a current value of the working current; when the feedback control unit determines When the current value of the working current is higher than an upper limit current value, the feedback control unit outputs the current control signal to the driving unit to control the current value of the operating current output to the load to be equal to the upper limit current value. The power supply device of claim 1, wherein the feedback control unit comprises a comparator and a signal generator electrically connected, the comparator being electrically connected to the voltage detecting unit, the signal generator Electrically connecting the driving unit, the comparator pre-sets the reference voltage values and the slope parameters, the comparator determines a voltage segment to which the voltage value of the working voltage belongs, and outputs a voltage value corresponding to the working voltage A slope signal of the slope parameter of the voltage section, after receiving the slope signal, the signal generator outputs the current control signal according to the slope signal and the voltage value of the working voltage. The constant power supply device of claim 1, wherein the preset power ranges between 90% and 110% of the preset power. The constant power supply device of claim 1, wherein an absolute value of a slope of the voltage segments is sequentially decreased in descending order of the reference voltage values. The constant power supply device of claim 1, wherein the operating voltage is a direct current voltage, and the operating current is a direct current.