WO2014121662A1

WO2014121662A1 - Constant-power supply apparatus and constant-power output control method

Info

Publication number: WO2014121662A1
Application number: PCT/CN2014/000122
Authority: WO
Inventors: 林铭锋
Original assignee: 东林科技股份有限公司
Priority date: 2013-02-08
Filing date: 2014-01-28
Publication date: 2014-08-14
Also published as: JP6106900B2; JP2016512648A

Abstract

The present invention relates to a constant-power supply apparatus and a control method used for outputting constant power so that power supplied for a load remains in a preset power range. The constant-power supply apparatus comprises a drive unit, a voltage detection unit and a feedback control unit. The drive unit receives electric energy of a power supply and outputs a working voltage and a working current for the load. The voltage detection unit detects a voltage value of the working voltage. The feedback control unit is preset with at least two different reference voltage values. A voltage segment is formed between the two reference voltage values. The feedback control unit outputs a current control signal to the drive unit according to the detected voltage value of the working voltage and a slope parameter of the voltage segment so as to control a current value of the working current and enable the power supplied for the load to remain in the preset power range.

Description

Constant power supply device and control method for constant power output

The present invention relates to load driving, and more particularly, to a constant power power supply device and a control method for a constant power output. Background technique

Generally, a constant power supply device is connected to a load (e.g., a light emitting diode chip or a rechargeable battery) that supplies a constant power to supply power of a preset power to the load. A conventional fixed power supply unit can only provide a combination of operating voltage and operating current to the load. However, for power supplies of the same power but requiring different operating voltages and operating currents, conventional power supply units are not suitable. Taking the light-emitting diode chip as an example, at present, the specifications of the light-emitting diode chip on the market are numerous. For the light-emitting diode chip with the same power, the combination of the working voltage and the working current is various, and the working voltage of the 28W LED chip is taken as an example. The combination with the operating current is 80V/350mA, 56V/500mA, 40V/700mA, etc. Therefore, in order to drive such a variety of LED chips, the current way is to develop a power supply for each LED chip. Supply device.

However, for manufacturers of LED lighting systems, each type of LED chip needs to manufacture a variety of power supply devices, which not only increases the pressure on the power supply device inventory, but also cannot be priced, resulting in manufacturing costs. No high. Therefore, the design of the conventional fixed-power power supply device is still not perfect, and there is room for improvement. Summary of the invention

The main object of the present invention is to provide a constant power power supply device and a control method for a constant power output, which can be applied to loads of the same power but different working voltages and working currents, and control the power supplied to the load to be maintained at a preset. The range of power.

The object of the present invention is achieved by the following technical solutions. The constant power supply device provided by the present invention is disposed between the power source and the load, and is configured to control the power supplied to the load within a preset power range, and includes a driving unit, a voltage detecting unit and a feedback control unit. The driving unit is configured to receive power of the power source and output a working voltage and an operating current to the load; the voltage detecting unit is electrically connected to the driving unit to detect a voltage value of the working voltage; the feedback control The unit is electrically connected to the voltage detecting unit and the driving unit, and the feedback control unit is pre-configured with at least two different reference voltage values, and a voltage section is formed between the two reference voltage values, and the voltage section corresponds to a slope parameter, the feedback control unit is configured to output a current control signal to the driving unit according to the voltage detecting unit rate parameter, to control the working power input to the load The current value of the current, wherein the product of the current value of the operating current and the voltage value of the operating voltage is within a range of the preset power.

The object of the present invention can also be further achieved by the following technical measures.

The above-mentioned constant power supply device, wherein when the feedback control unit determines that the voltage value of the operating voltage is higher than the upper limit voltage value, the feedback control unit outputs a voltage control signal to the driving unit to control output to the load The voltage value of the operating voltage is equal to the largest of the plurality of reference voltage values.

The above-mentioned constant power supply device further 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 the work When the current value of the current is higher than the upper limit current value, the feedback control unit outputs a highest current control signal to the driving unit to control a current value of the operating current output to the load to be equal to the upper limit current value.

The power supply device of the above-mentioned power supply, wherein the feedback control unit includes a comparator and a signal generator electrically connected, the comparator is electrically connected to the voltage detecting unit, and the signal generator is electrically connected to the driving unit The comparator pre-sets the plurality of reference voltage values and the slope parameter, and the comparator determines a slope signal corresponding to a slope parameter of the voltage segment when the voltage value of the working voltage belongs to the voltage segment, 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 foregoing fixed power supply device, wherein the preset power range is the preset power

Between 90% and 110%.

In the foregoing constant power supply device, the feedback control unit is pre-configured with at least three different reference voltage values, and the voltage segments are formed between adjacent two reference voltage values.

In the foregoing constant power supply device, the absolute value of the slope of the plurality of voltage sections is sequentially decreased in descending order of the plurality of reference voltage values.

The aforementioned constant power power supply device, wherein the load is a light emitting diode chip.

The object of the present invention is also achieved by the following technical solutions. The present invention further provides a control method for a constant power output for maintaining power supplied to a load within a range of preset power. The method is pre-configured with at least two different reference voltage values, the two reference voltage values. Forming a voltage section corresponding to the slope parameter, the method comprising the steps of: detecting a voltage value of an operating voltage supplied to the load; selecting the voltage section corresponding to the voltage value of the working voltage a slope parameter; according to the selected slope parameter and the voltage value of the working voltage, outputting a corresponding working current to the load, wherein a product of the current value of the working current and the voltage value of the working voltage is between the preset Within the power range.

The object of the present invention can also be further achieved by the following technical measures. The foregoing control method of the constant power output, wherein when it is determined that the voltage value of the operating voltage is higher than the upper limit voltage value, the voltage value of the operating voltage output to the load is limited to be equal to the largest of the plurality of reference voltage values.

The foregoing control method of the constant power output further includes: detecting a current value of the working current supplied to the load, and limiting the output current to the load when the current value of the working current is higher than the upper limit current value; The current value is equal to the upper limit current value.

The foregoing control method of the constant power output, wherein the preset power ranges from 90% to 110% of the preset power.

The foregoing control method of the constant power output, wherein the feedback control unit is pre-configured with at least three different reference voltage values, and the voltage segments are formed between adjacent two reference voltage values.

The foregoing control method of the constant power output, wherein an absolute value of a slope of the plurality of voltage sections is sequentially decreased in descending order of the plurality of reference voltage values.

The foregoing method for controlling a constant power output, wherein the load is an LED chip.

According to the above technical solution, the constant power power supply device and the control method of the constant power output of the present invention have at least the following advantages and beneficial effects: thereby, the control method of the constant power power supply device and the constant power output can be applied to Loads with the same power but different working voltages and operating currents, and maintain the power supplied to the load within the preset power range, effectively improving the conventional fixed power supply device can only be applied to a single working voltage and working current load Inconvenience.

The above description is only an overview of the technical solutions of the present invention, and the technical means of the present invention can be more clearly understood, and can be implemented in accordance with the contents of the specification, and the above and other objects, features and advantages of the present invention can be made more obvious. It is to be understood that the following preferred embodiments are described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

1 is a block diagram of a fixed power supply device applied to an LED lighting system in accordance with a preferred embodiment of the present invention;

2 is a graph showing the relationship between the operating voltage and the operating current according to a preferred embodiment of the present invention; and FIG. 3 is a flow chart of the control method for the constant power output of the present invention.

[Main component symbol description]

10 power supply

20 LED chip

30 drive unit

40 constant power adjustment module

42 voltage detection unit

44 current detection unit 46: Feedback control unit

462: Comparator

464: Signal Generator

VI, V2, V3, V4: Reference voltage value

Vmax: upper limit voltage value

Imax: upper limit current value

S: voltage section

C: Curve The best way to achieve the invention

In order to further explain the technical means and efficacy of the present invention for achieving the intended purpose of the invention, a constant power supply device and a control method for constant power output according to the present invention are provided below with reference to the accompanying drawings and preferred embodiments. Detailed description, structure, characteristics and efficacy, detailed description: 3⁄4 mouth.

1 is an illumination system having a constant power supply device of the present invention. The constant power supply device is electrically connected to a power source 10 and a load exemplified by an LED chip 20, and the constant power supply device includes a driving unit. 30 and constant power adjustment module 40. among them:

The driving unit 30 is electrically connected to the power source 10 and the LED chip 20 for receiving the power of the power source 10 and outputting an operating voltage and an operating current to the LED chip 20; the driving unit 30 can control the operation in a controlled manner. The voltage value of the voltage and the current value of the operating current. In practice, the drive unit 30 can be designed based on a circuit using PWM, half bridge, Buck, Boos t, etc.

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 of the driving unit 30 for the LED chip 20.

The feedback control unit 46 includes a comparator 462 and a signal generator 464 that are electrically connected to each other. The comparator 462 is electrically connected to the voltage detecting unit 42 . The signal generator 464 is electrically connected to the driving unit 30 . As shown in FIG. 2, in the embodiment, the comparator 462 is pre-configured with four different reference voltage values VI, V2, V3, and V4, and each of the reference voltage values corresponds to a current value of the operating current. A voltage section S is formed between adjacent two reference voltage values, and the three straight lines formed by the connection of the three voltage sections S are close to an ideal working voltage-operating current relationship (:, the aforementioned ideal operating voltage - the product of the operating current is the preset power. If the reference voltage value VI (the largest of the reference voltage values) is defined, it is the upper limit voltage value Vmax; and the reference voltage value V 4 (see The current value of the operating current corresponding to the smallest of the voltage values is the upper limit current value Imax. a straight line of each of the voltage segments S has a slope, and an absolute value of a slope of the plurality of voltage segments S decreases sequentially in descending order of the plurality of reference voltage values VI, V2, V3, and V4. That is, the absolute value of the slope of the voltage section S of the reference voltage value VI-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 to the reference voltage value V4 is the smallest. Each of the slopes corresponds to a slope parameter, and the plurality of 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 changes the current value of the operating current output to the light emitting diode chip 20 accordingly.

In addition, the comparator 462 can further output a voltage limiting signal and a current limiting signal to the signal generator 464. After receiving the current limiting signal, the signal generator 464 controls the driving unit 30 to limit the voltage value of the operating voltage or The current value of the working current avoids abnormality of the output working voltage or operating current, and causes the LED chip 20 to be damaged.

Thereby, the aforementioned constant power power supply device can perform the control method of the constant power output of the present invention, and the method includes the following steps as shown in FIG. 3:

A. Connect the LED chip 20 having the same power as the preset power to the driving unit 30.

B. The voltage detecting unit 42 detects the voltage value of the working voltage, and detects the electrical value of the working power through the electrical detecting unit 44.

C. The comparator 462 determines whether the voltage value of the operating voltage is higher than the upper limit voltage value Vmax:

If yes, the operating voltage is abnormal. At this time, the comparator 462 sends the voltage limiting signal to the signal generator 464. After receiving the voltage limiting signal, the signal generator 464 outputs the highest voltage control signal to the driving unit 30. To limit the voltage value of the operating voltage output to the LED chip 20 to be equal to the reference voltage value VI, and return to step B.

If no, proceed to step D.

D. The comparator 462 determines whether the current value of the operating current is higher than the upper limit current value Imax:

If yes, the operating current is abnormal. At this time, the comparator 462 sends the current limiting signal to the signal generator 464. After receiving the current limiting signal, the signal generator 464 outputs the highest current control signal to the driving unit 30. The voltage flow for limiting the operating current output to the light-emitting diode chip 20 is equal to the upper limit current value Imax, and returns to step B.

If no, proceed to step E.

E. The comparator 462 determines the voltage segment S to which the voltage value of the working voltage belongs according to the voltage value of the operating voltage measured by the voltage detecting unit 42, and obtains a voltage corresponding to the working voltage. The slope parameter of the voltage segment S to which the value belongs is based on the output of 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 current to the operating current of the LED chip 20. The product of the 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 straight 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 5之间之间。 The product of the current value of the voltage is between 25. 2W to 30. 8W.

F. Repeat steps B to E to continuously maintain the power supplied to the LED chip 20 within the range of the preset power.

In the above embodiment, the control method of the constant power supply device and the constant power output of the present invention can be applied to an LED chip having the same power but different working voltages and operating currents, and is not limited to the illumination of a single working voltage and a working current. The diode chip effectively improves the inconvenience of the light-emitting diode chip of the conventional light-emitting diode illuminating device which can only be applied to a single working voltage and working current.

In the above embodiment, the LED chip 20 is taken as an example to describe the constant power power supply device and the control method of the constant power output of the present invention. In addition to the LED chip 20, other electronic products requiring constant power operation, such as charging. As the battery, the constant power supply device of the present invention can also be used.

The invention utilizes the relationship between the plurality of voltage segments S and the operating current to form an ideal working voltage-operating current curve, and even if the load of different working voltages is replaced, the working current for the input to the negative load can be changed accordingly, so that the supply and the output can be changed. The power to the load is maintained within the range of the preset power. When the preset voltage section S is more, the range of the preset power output is closer to the ideal value.

The above is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Although the present invention has been disclosed in the above preferred embodiments, it is not intended to limit the present invention. The skilled person can make some modifications or modifications to the equivalent embodiments by using the above-disclosed technical contents without departing from the technical scope of the present invention, but without departing from the technical solution of the present invention, according to the present invention. Technical simplifications Any simple modifications, equivalent changes and modifications made to the above embodiments are still within the scope of the technical solutions of the present invention.

Claims

Rights request

1. A control method for constant power output to maintain the power delivered to the load within a preset power range. The method is preset with at least two different reference voltage values. Between the two reference voltage values A voltage section is formed, and the voltage section corresponds to a slope parameter, and is characterized in that the method includes the following steps:

Detect the voltage value of the working voltage supplied to the load; output the corresponding working current to the load according to the selected slope parameter and the voltage value of the working voltage, wherein the current value of the working current is the same as the voltage value of the working voltage. The product of the voltage values is within the range of the preset power.

2. The control method of constant power output according to claim 1, wherein when it is determined that the voltage value of the working voltage is higher than the upper limit voltage value, the voltage value of the working voltage output to the load is limited to be equal to the upper limit voltage value. The largest of the reference voltage values.

3. The control method of constant power output according to claim 1 or 2, characterized in that it also includes detecting the current value of the operating current supplied to the load, and when the current value of the operating current is higher than the upper limit current value, the current value that limits the operating current output to the load is equal to the upper limit current value.

4. The control method of constant power output as claimed in claim 1, wherein the range of the preset power is between 90% and 110% of the preset power.

5. The control method of constant power output as claimed in claim 1, wherein the feedback control unit is preset with at least three different reference voltage values, and the voltage region is formed between two adjacent reference voltage values. part.

6. The control method of constant power output according to claim 5, wherein the absolute values of the slopes of the plurality of voltage sections decrease sequentially in the order of the plurality of reference voltage values from large to small. .

7. The constant power output control method as claimed in claim 1, wherein the load is a light emitting diode chip.

8. A constant power power supply device, which is arranged between the power supply and the load and is used to control the power supplied to the load within a preset power range. It is characterized in that it includes:

The driving unit is used to receive the electric energy of the power supply and output the working voltage and working current to the load;

a voltage detection unit, electrically connected to the driving unit, for detecting the voltage value of the working voltage; and

A feedback control unit is electrically connected to the voltage detection unit and the driving unit. The feedback control unit is preset with at least two different reference voltage values. A voltage is formed between the two reference voltage values. section, the voltage section corresponds to a slope parameter, and the feedback control unit outputs a current control signal to the drive unit according to the voltage detection unit rate parameter to control the current value of the operating current output to the load. Wherein, the product of the current value of the working current and the voltage value of the working voltage is within the preset power range.

9. The constant power power supply device according to claim 8, wherein when the feedback control unit determines that the voltage value of the operating voltage is higher than the upper limit voltage value, the feedback control unit outputs a voltage control signal to the The driving unit controls the voltage value of the operating voltage output to the load to be equal to the maximum of the plurality of reference voltage values.

10. The constant power power supply device of claim 9, further comprising a current detection unit electrically connected to the drive unit and the feedback control unit for detecting the current value of the operating current. ; When the feedback control unit determines that the current value of the operating current is higher than the upper limit current value, the feedback control unit outputs the highest current control signal to the drive unit to control the current value of the operating current output to the load to be equal to This upper limit current value.

11. The constant power power supply device of claim 8, wherein the feedback control unit includes a comparator and a signal generator that are electrically connected to each other, and the comparator is electrically connected to the voltage detection unit, The signal generator is electrically connected to the driving unit, and the comparator is preset with the plurality of reference voltage values and the slope parameter. When the comparator determines that the voltage value of the working voltage belongs to the voltage section, it outputs the voltage corresponding to the voltage section. The slope signal of the slope parameter of the 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 operating voltage.

12. The constant power power supply device according to claim 8, wherein the preset power range is between 90% and 110% of the preset power.

13. The constant power power supply device according to claim 8, wherein the feedback control unit is preset with at least three different reference voltage values, and the voltage area is formed between two adjacent reference voltage values. part.

14. The constant power power supply device according to claim 13, wherein the absolute values of the slopes of the plurality of voltage sections decrease sequentially in descending order of the plurality of reference voltage values.

15. The constant power power supply device as claimed in claim 8, wherein the load is a light emitting diode chip.