JP2020145101A - Power supply device and lighting device - Google Patents

Abstract

To provide a power supply device which can accurately determine an AC voltage period.SOLUTION: A power supply device 15 includes rectification means 22, a power inverter circuit 23, detection means 26, comparison means 31, determination means 32, and control means 33. The rectification means 22 rectifies an AC voltage. The power inverter circuit 23 inputs a rectification voltage rectified by the rectification means 22 to convert into an output voltage to be supplied to a load 14. The detection means 26 detects an AC voltage. The comparison means 31 compares the AC voltage, detected by the detection means 26, with a predetermined threshold to output a pulse according to the result of the comparison. The determination means 32 measures a time between the rise of a pulse and the rise of the next pulse which are output from the comparison means 31, and a time between the fall of a pulse and the fall of the next pulse respectively, to determine the AC voltage period. The control means 33 controls the power inverter circuit 23 based on the AC voltage period determined by the determination means 32.SELECTED DRAWING: Figure 1

Description

An embodiment of the present invention relates to a power supply device that supplies power to a load, and a lighting device that uses the power supply device.

Conventionally, there is a power supply device that inputs an AC voltage, converts it into a predetermined output voltage, and supplies it to a load. Further, for example, in a power supply device corresponding to the phase dimming method, the period of the input phase-controlled AC voltage may be determined, and the determined period information may be used for control.

When the AC voltage waveform contains a distortion waveform containing noise, the distortion waveform containing noise is easily recognized as noise, but when the waveform is difficult to distinguish from the distortion waveform due to phase control, the waveform is normal. Despite this, it may be recognized as noise.

In a power supply device that uses AC voltage cycle information for control, it is desired that the AC voltage cycle can be accurately determined.

Japanese Unexamined Patent Publication No. 2016-666488

The present invention is to provide a power supply device and a lighting device capable of accurately determining the period of an AC voltage.

The power supply device of the embodiment includes a rectifying means, a power conversion circuit, a detecting means, a comparing means, a determining means, and a controlling means. The rectifying means rectifies the AC voltage. The power conversion circuit inputs the rectified voltage rectified by the rectifying means and converts it into an output voltage supplied to the load. The detecting means detects the AC voltage. The comparison means compares the AC voltage detected by the detection means with a predetermined threshold value, and outputs a pulse according to the comparison result. The determination means measures the rise time between the rise of the pulse and the rise of the next pulse output from the comparison means and the fall time between the fall of the pulse and the fall of the next pulse, respectively. To determine the period of the AC voltage. The control means controls the power conversion circuit based on the cycle of the AC voltage determined by the determination means.

According to the power supply device of the embodiment, it can be expected that the cycle of the AC voltage can be accurately determined.

It is a circuit diagram of the power supply device used for the lighting device which shows one Embodiment. It is the timing chart of the cycle determination of the AC voltage by the power supply device as above. It is a timing chart which shows various waveform examples of the pulse output from the comparison means of the power supply device. The same applies. The cycle determination example of the power supply device is shown, (a) is a table of cycle determination examples for the output signal C1, and (b) is a table of cycle determination examples for the output signal C2.

Hereinafter, one embodiment will be described with reference to the drawings.

As shown in FIG. 1, the lighting device 10 is connected to the AC power supply e via the phase dimmer 11.

The phase dimmer 11 uses, for example, a switch unit having a triac or a switching element and a rectifying element connected in series in the opposite direction, and moves to the load side in the middle of every half cycle of the AC voltage according to the set dimming level. A phase control method or an anti-phase control method that controls the continuity and non-conduction of the above is adopted.

The lighting device 10 includes a load 14 and a power supply device 15 that supplies power to the load 14.

The load 14 includes a light emitting element 14a which is a semiconductor light emitting element. The light emitting element 14a is, for example, an LED or an organic EL.

Further, the power supply device 15 includes a main circuit 18 connected between the AC power source e and the load 14, and a sub circuit 19 connected in parallel with the main circuit 18 with respect to the AC power source e.

The main circuit 18 includes a rectifying means 22 that rectifies the input AC voltage, and a power conversion circuit 23 that converts the rectified voltage rectified by the rectifying means 22 into a predetermined output voltage supplied to the load 14. ..

As the rectifying means 22, for example, a bridge diode having four bridge-connected rectifying elements in one package is used.

As the power conversion circuit 23, for example, a step-down chopper circuit 23a is used. The step-down chopper circuit 23a includes at least one switching element, and controls the switching operation of the switching element to step down the rectified voltage rectified by the rectifying means 22 to a predetermined output voltage and supply it to the load 14.

Further, the sub circuit 19 includes a detection means 26 for detecting the AC voltage, a bleeder circuit 27 for drawing out the bleeder current, and a control circuit 28 for controlling the power conversion circuit 23 and the bleeder circuit 27 based on the detection of the AC voltage. I have.

The detecting means 26 uses a bridge diode, which is the same component as the rectifying means 22. However, of the four rectifying elements of the diode bridge, only two rectifying elements are used for detecting the AC voltage, and the remaining two rectifying elements are not used. In the two rectifying elements used, the anode is connected to the AC power supply e side via the phase dimmer 11, and the cathode is connected to the bleeder circuit 27 and the control circuit 28.

The bleeder circuit 27 is used when the phase dimmer 11 is used, and is configured to draw out a bleeder current for securing the holding current of the triac of the phase dimmer 11.

The control circuit 28 is composed of a microcomputer. The control circuit 28 controls the power conversion circuit 23 and the bleeder circuit 27 based on the AC voltage detected by the detection means 26. The control circuit 28 detects the phase angle of the AC voltage detected by the detection means 26, controls the switching operation of the switching element of the power conversion circuit 23 based on the detected phase angle, and determines the brightness of the light emitting element 14a. Control.

The control circuit 28 is input with a DC voltage VDC which is a voltage after rectification rectified by the rectifying means 22, an input voltage Vin from the detecting means 26 for detecting an AC voltage, and a control voltage VDD through the bleeder circuit 27. ..

The control circuit 28 compares the AC voltage detected by the detection means 26 with a predetermined threshold value, and outputs a pulse according to the comparison result. The comparison means 31 and the AC voltage based on the pulse output from the comparison means 31. The determination means 32 for determining the cycle and the control means 33 for controlling the power conversion circuit 23 based on the cycle of the AC voltage determined by the determination means 32 are provided.

The comparison means 31 is composed of a comparator. When the AC voltage detected by the detection means 26, that is, the input voltage Vin is input to the inverting input terminal of the comparator, the predetermined threshold voltage is input to the non-inverting input terminal of the comparator, and the input voltage Vin is less than the threshold voltage, "Hi". , A pulse that becomes "Lo" when the input voltage Vin is equal to or higher than the threshold voltage is output from the output terminal of the comparator. The comparison means 31 is provided with at least two. The two comparison means 31 compare the input voltage Vin based on different thresholds.

The determination means 32 determines the period of the AC voltage based on the comparison result of any one of the comparison means 31, or determines the period of the AC voltage based on the comparison result of all the comparison means 31.

The determination means 32 determines the rise time between the rise of the pulse and the rise of the next pulse output from the comparison means 31 and the fall time between the fall of the pulse and the fall of the next pulse, respectively. It is measured and both the rise-down time and the fall-down time are used to determine the cycle of the AC voltage. The determination means 32 determines whether or not the rise time and the fall time are within the predetermined times specified in the cycle determination conditions, respectively.

When the time between the rise and fall or the time between the fall and the rise of one pulse obtained from the comparison means 31 is equal to or less than a predetermined lower limit value, the determination means 32 determines the pulse from the period determination. exclude.

Further, the determination means 32 has a predetermined number of consecutive pulses in which the time between the rise and fall of one pulse or the time between the fall and the rise is equal to or less than a predetermined lower limit value, and the rise time and the rise time and When the fall-down time can be determined as the AC voltage cycle, the measured rise-down time and fall-down time are determined as the AC voltage cycle.

Further, the determination means 32 has at least one pulse in which the time between the rise and fall of one pulse or the time between the fall and the rise is equal to or less than a predetermined lower limit value, and the rise time and the rise time When the fall-down time deviates from the predetermined period determination condition of the AC voltage, the period of the AC voltage is determined in the subsequent pulses.

Then, the power supply device 15 performs phase dimming control that changes the brightness of the light emitting element 14a, which is the load 14, according to the phase angle of the AC voltage. Therefore, immediately after energization, the power supply device 15 detects whether the phase control of the AC voltage is the phase control method or the antiphase control method, and determines the period of the AC voltage, that is, 50 Hz or 60 Hz. The period is determined and the result is used for dimming control.

Next, the cycle determination of the AC voltage by the power supply device 15 will be described.

FIG. 2 shows the waveform of the input voltage Vin input from the detection means 26 to the control circuit 28, and the waveforms of the output signals C1 and the output signals C2 from the comparators of the two comparison means 31 with respect to the waveform of the input voltage Vin. It shows a pulse that is. The determination means 32 of the control circuit 28 determines the period using the pulse train output from the comparator.

Of the comparators of the two comparing means 31, the threshold value of one comparator is the first threshold voltage Vth1, and the threshold value of the other comparator is the second threshold voltage Vth2 higher than the first threshold voltage Vth1. The output signal C1 compared with the first threshold voltage Vth1 is output from one comparator, and the output signal C2 compared with the second threshold voltage Vth2 is output from the other comparator.

Then, the determination means 32 has a rise time T2-1 between the rising edge of the pulse and the rising edge of the next pulse and a falling interval between the falling edge of the pulse and the falling edge of the next pulse for the output signal C2. The time T2-2 is measured, the time T2on between the rising edge and the falling edge of one pulse is measured, and the cycle is determined from these measurement results. The period of the output signal C1 may be determined in the same manner.

When both the rise time T2-1 and the fall time T2-2 satisfy the cycle determination condition, the determination means 32 sets the pulse as the target of the period determination.

When the time T2on between the rising edge and the falling edge of the pulse is shorter than the time determined by the period determination condition by the noise waveform n included in the waveform of the input voltage Vin, the determination means 32 determines that the pulse is noise and determines the period. Exclude from. However, even if the time T2on between the rise and fall of the pulse is shorter than the time specified in the cycle judgment condition, both the rise time T2-1 and the fall time T2-2 satisfy the cycle judgment condition. If it is satisfied, it is subject to the cycle judgment.

Then, by performing the cycle determination based on both the rise time T2-1 and the fall time T2-2, only one of the rise time T2-1 and the fall time T2-2 is used. Even when the period is determined, it becomes easy to distinguish whether the waveform is normal or abnormal, and the period of the AC voltage can be accurately determined.

Further, FIG. 3 shows various waveform examples (A) to (G) of the output signal C2. Waveform examples (A) to (C) are output signals C2 when the AC voltage is 50 Hz, and waveform examples (D) to (G) are output signals C2 when the AC voltage is 60 Hz.

In each of the waveform examples (A) to (G), it is assumed that the data of the rising edge t1 of the pulse, the rising edge t2 and the falling edge t3 of the next pulse are acquired from the pulse train of the output signal C2.

The fall time T2-2 (t1 to t3) between the pulse fall t1 and the fall t3 of the next pulse, and the time T2on (t2 to t3) between the pulse rise t2 and fall t3. get.

It is confirmed whether the time T2on (t2 to t3) between the rising edge t2 and the falling edge t3 of the pulse is equal to or less than the time Tth1 specified in the cycle determination condition.

If the time T2on (t2 to t3) between the rising edge t2 and the falling edge t3 of the pulse is longer than Tth1, the pulse between t2 and t3 is subject to the period determination.

If the time T2on (t2-t3) between the rising edge t2 and the falling edge t3 of the pulse is Tth1 or less as in the waveform examples (A), (B), (D), and (E) (Fig. 3). (Pulse indicated by diagonal lines), the pulse between t2 and t3 is determined to be noise and excluded from the period determination. The data of the rising edge t2'and the falling edge t3'of the pulse following the excluded pulse are acquired, and the time T2on (t2'-t3') between the rising edge t2'and the falling edge t3'can be longer than Tth1. For example, the pulse is the target of the period determination.

Further, if the time T2on (t2-t3) between the rising edge t2 and the falling edge t3 of the pulse is Tth1 or less as in the waveform example (G), the pulse between t2-t3 is determined as noise. Exclude from cycle judgment. The data of t2'and t3' of the pulse next to this excluded pulse are acquired, and even if the time T2on (t2'to t3') between the rising t2'and the falling t3' is longer than Tth1, the pulse When the fall time T2-2 (t1 to t3') between the fall t1 of the pulse and the fall t3'of the pulse following the excluded pulse is longer than the time Tth2 specified in the cycle judgment condition. The pulse between t2 and t3 is used as a sinusoidal distortion waveform, and the period is determined in the pulse after the pulse from which the data of t2'to t3' is acquired.

That is, the determination means 32 has at least one pulse in which the time T2on (t2 to t3) between the rising edge t2 and the falling edge t3 of one pulse is equal to or less than a predetermined lower limit value, and the rising edge time T2-1. And when the fall time T2-2 deviates from the cycle judgment condition, the cycle judgment is performed in the subsequent pulses.

Further, as in the waveform examples (C) and (F), when the time T2on (t2-t3) between the rising edge t2 and the falling edge t3 of the pulse is Tth1 or less continuously for a predetermined number of times or more, Even if the time T2on (t2-t3) between the rising edge t2 and the falling edge t3 of the pulse is Tth1 or less, the pulse is subject to the period determination.

That is, the determination means 32 has a predetermined number of consecutive pulses in which the time T2on (t2 to t3) between the rising edge t2 and the falling edge t3 of one pulse is equal to or less than a predetermined lower limit value (Tth1), and the rise time. When T2-1 and the fall time T2-2 can be determined as the AC voltage cycle, the measured rise time T2-1 and fall time T2-2 are determined as the AC voltage cycle.

In this way, the noise component (shaded part in FIG. 3) included in the waveforms of the waveform examples (A), (B), (D), and (E) is excluded from the period determination, and the sine wave of the waveform example (G). The wave distortion waveform is used for periodic determination. Further, the waveforms having a short time T2on (t2-t3) between the rising t2 and the falling t3 of the pulses of the waveform examples (C) and (F) can be the target of the period determination.

Then, the determination means 32 has, for example, 60 Hz if the period is in the range of T1 to T2 ms, and 50 Hz if the period is in the range of T1 to T2 ms (T1 <T3, T2 <T4, (T2-T1) <(T4-T3)). May be determined. This determination is repeated 10 times, and the cycle with the larger number of determinations is adopted. If the numbers are the same, 60 Hz is used.

Here, if the period is determined based only on the fall time T2-2 (or only the rise time T2-1), in the waveform examples (A) and (B) of FIG. 3, the fall Noise can be removed by setting the interval time T2-2 to a predetermined time, but the waveform of the waveform example (C) is determined as a waveform in which noise is continuous. Further, there may be a case where the pulse of the waveform example (F) generated at substantially the same timing as the shaded portion of the waveform example (A) of FIG. 3 cannot be distinguished.

Therefore, the cycle is determined based on both the rise time T2-1 and the fall time T2-2, and when both are matched, it is adopted as the judgment result. Further, when the time T2on between the rising edge t2 and the falling edge t3 of the pulse is short, it is a noise waveform, but in addition to the pulse width information, the rising interval time T2-1 and the falling interval time T2-2 information. To make a judgment. As a result, the waveforms in the shaded areas of the waveform examples (A), (B), (D), and (E) in FIG. 3 can be determined as noise. On the other hand, the waveforms of waveform examples (C) and (F) are continuous short waveforms, and the waveform of waveform example (G) is a sinusoidal distortion waveform, but both waveforms can be used for periodic determination. it can.

Further, FIG. 4 shows an example of cycle determination.

FIG. 4A is a table of periodic determination examples for the output signal C1, and FIG. 4B is a table of periodic determination examples for the output signal C2. In the table, "1" indicates a case where it is determined that the predetermined condition is satisfied, and "0" indicates a case where the predetermined condition is not satisfied.

For example, in FIG. 4 (b), as shown in the pattern (1), the rise time T2-1, the fall time T2-2, and the time T2on between the rise and fall are all within the predetermined range of the cycle judgment condition. If there is, the waveform is determined to be normal and acquired as a target for periodic determination.

If both the rise time T2-1 and the fall time T2-2 are within the predetermined range of the cycle judgment condition as in pattern (2), the time T2on between the rise and fall is the cycle judgment condition. Even if it is out of the predetermined range, it is determined that the waveform is an abnormal sine wave and is not noise, and is subject to periodic determination.

As in patterns (3) and (4), either one of the rise time T2-1 and the fall time T2-2 is within the predetermined range, the other is outside the predetermined range, and between the rise and fall. If the time T2on is also outside the predetermined range, the waveform is determined to be noise and excluded from the period determination.

As in patterns (5) and (6), either one of the rise time T2-1 and the fall time T2-2 is within the predetermined range, the other is outside the predetermined range, and between the rise and fall. If the time T2on of is within a predetermined range, it is determined that the waveform is affected by the phase dimming by the phase dimmer 11, and the waveform is subject to the period determination.

If both the rise time T2-1 and the fall time T2-2 are out of the predetermined range as in patterns (7) and (8), the waveform is waveform regardless of the time T2on between the rise and fall. Is determined to be noise and is excluded from the period determination.

Although the periodic determination based on the output signal C2 from one comparison means 31 has been described above, the periodic determination based on the output signal C1 from the other comparison means 31 can be performed in the same manner, and both comparisons can be performed. Period determination may be performed on the output signal C1 and the output signal C2 from the means 31.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

10 Lighting equipment
14 load
14a light emitting element
15 Power supply
22 Rectifying means
23 Power conversion circuit
26 Detection means
31 Comparison means
32 Judgment means
33 Control means

Claims (7)

With rectifying means to rectify AC voltage;
With a power conversion circuit that inputs the rectified voltage rectified by the rectifying means and converts it into the output voltage supplied to the load;
With a detecting means for detecting the AC voltage;
With a comparison means that compares the AC voltage detected by the detection means with a predetermined threshold value and outputs a pulse according to the comparison result;
The AC rise time between the rise of the pulse and the rise of the next pulse output from the comparison means and the fall time between the fall of the pulse and the fall of the next pulse are measured, respectively. As a judgment means for determining the voltage cycle;
With a control means that controls the power conversion circuit based on the cycle of the AC voltage determined by the determination means;
A power supply device characterized by comprising. The determination means excludes the pulse from the period determination when the time between the rising edge and the falling edge of the pulse or the time between the falling edge and the rising edge is equal to or less than a predetermined lower limit value. Item 1. The power supply device according to item 1. In the determination means, the pulse in which the time between the rise and fall of the pulse or the time between the fall and the rise is equal to or less than a predetermined lower limit value is continuous for a predetermined number of times, and the rise time and the fall The power supply device according to claim 2, wherein when the interval time can be determined as the cycle of the AC voltage, the measured rise-up time and the fall-down time are determined as the AC voltage cycle. The determination means has at least one pulse in which the time between the rise and fall of the pulse or the time between the fall and the rise is equal to or less than a predetermined lower limit value, and the rise time and the fall time. The power supply device according to claim 2 or 3, wherein when the interval time deviates from the predetermined period determination condition of the AC voltage, the period of the AC voltage is determined in the subsequent pulses. The comparison means includes at least two.
The power supply device according to any one of claims 1 to 4, wherein the determination means determines the period of the AC voltage based on the comparison result of any one of the comparison means. The comparison means includes at least two.
The power supply device according to any one of claims 1 to 4, wherein the determination means determines the period of the AC voltage based on the comparison results of all the comparison means. With the light emitting element that is the load;
The power supply device according to any one of claims 1 to 6, which supplies power to the light emitting element;
A lighting device characterized by comprising.

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