TWM458052U - Driving circuit - Google Patents

Description

Drive circuit

The present invention relates to a driving circuit, and more particularly to a driving circuit for driving a light emitting diode.

Referring to FIG. 1 and FIG. 2, a conventional driving circuit 10 is used to drive a light emitting module 13. The light emitting module 13 includes first and second connecting ends 131, 132, and a plurality of light emitting diodes 133 connected in series between the first and second connecting ends 131, 132. The drive circuit 10 includes a full bridge rectifier 11 and a current regulator 12. The full-bridge rectifier 11 receives an alternating current power and is electrically connected to the first connection end 131 of the light-emitting module 13 for rectifying the alternating current power to generate a rectified power and output the rectified power to the light-emitting module 13. The current regulator 12 is electrically connected to the second connection end 132 of the light emitting module 13 for drawing current from the second connection terminal 132 and adjusting the magnitude of the current drawn.

The voltage of the rectified power is as shown by a curve 141, and the brightness of the light-emitting module 13 is as shown by a curve 142. When the voltage amplitude of the rectified power is greater than the forward voltage amplitude Vf of the light-emitting module 13, the light-emitting module 13 has a current flowing (the current amplitude is determined by the current regulator 12), thereby emitting light, and the brightness is proportional to the current adjustment. The current amplitude determined by the device 12 and the number of the light-emitting diodes 133, and when the voltage amplitude of the rectified power is smaller than the forward voltage amplitude Vf of the light-emitting module 13, no current flows through the light-emitting module 13, and thus Illuminated, the brightness is zero.

However, the conventional drive circuit 10 has the following disadvantages:

(1) The power factor of the AC power is made low.

(2) causing the light-emitting module 13 to have a double-frequency phenomenon of alternating current power, using The person feels eye discomfort during long-term use, and the average brightness of the light-emitting module 13 is low.

(3) When the voltage amplitude of the rectified power is greater than the forward voltage amplitude Vf of the light-emitting module 13, the voltage difference is added across the current regulator 12 to cause power loss, and the voltage peak of the rectified power and the light-emitting module The larger the difference in the forward voltage amplitude Vf of 13 is, the larger the power loss is, and the worse the efficiency is.

Accordingly, it is an object of the present invention to provide a drive circuit that can ameliorate at least some of the disadvantages of the prior art.

Thus, the novel driving circuit is used to drive a lighting module. The light emitting module includes first to Nth light emitting units, and first to N+1th connecting ends. The Mth light emitting unit is electrically connected between the Mth and the M+1th connection ends. Each of the light emitting units includes at least one light emitting diode. N 2, M = 1, 2, ..., N. The driving circuit comprises a rectifier, a power factor corrector and a current control module. The rectifier receives an alternating current power from the outside for rectifying the alternating current power to generate a rectified power. The power amplifier is electrically connected to the rectifier to receive the rectified power, and is electrically connected to the first connection end of the lighting module, configured to generate a driving power according to the rectified power, and output the driving power to the lighting module. And changing the current flow time of the rectifier to increase the power factor of the alternating current power. The current control module is electrically connected to the power factor corrector to receive the driving power, and is electrically connected to the second to N+1th terminals of the lighting module, according to the voltage amplitude of the driving power, At least one of the second to (N+1)th connection terminals draws current.

Yet another object of the present invention is to provide a drive circuit that can ameliorate at least some of the disadvantages of the prior art.

Thus, the novel driving circuit is used to drive a lighting module. The light emitting module includes first to third light emitting units and first to fourth connecting ends. The first lighting unit is electrically connected between the first and second connecting ends. The second lighting unit is electrically connected between the second and third connecting ends. The third lighting unit is electrically connected between the first and fourth connecting ends. Each of the light emitting units includes at least one light emitting diode. The driving circuit comprises a rectifier, a power factor correction module and a current control module. The rectifier receives an alternating current power from the outside for rectifying the alternating current power to generate a rectified power. The power factor correction module is electrically connected to the rectifier to receive the rectified power, and is electrically connected to the first connection end of the light emitting module, configured to generate a driving power according to the rectified power, and output the driving power to the lighting mode And changing the current flow time of the rectifier to increase the power factor of the AC power. The current control module is electrically connected to the power factor correction module to receive the driving power, and is electrically connected to the third and fourth terminals of the light emitting module, according to the voltage amplitude of the driving power, from the first A current is drawn from a target connection terminal of the third and fourth terminals.

The foregoing and other technical aspects, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments.

Before the present invention is described in detail, it is noted that in the following description, similar elements are denoted by the same reference numerals.

First preferred embodiment

Referring to FIG. 3 and FIG. 4, the first preferred embodiment 20 of the novel driving circuit is used to drive a lighting module 24. The light emitting module 24 includes first and second light emitting units 251 and 252, and first to third connecting ends 261 to 263. The Mth light emitting unit is electrically connected between the Mth and M+1th connecting ends, and M=1, 2. Each of the light emitting units 251, 252 includes at least one light emitting diode 250. In the present embodiment, the first and second light emitting units 251, 252 have the same number of light emitting diodes 250.

The driving circuit 20 of this embodiment comprises a rectifier 21, a power factor corrector 22 and a current control module 23.

The rectifier 21 receives an alternating current power from the outside for rectifying the alternating current power to generate a rectified power. In the present embodiment, the rectifier 21 is a full bridge rectifier.

The power factor corrector 22 is electrically connected to the rectifier 21 to receive the rectified power, and is electrically connected to the first connection end 261 of the light emitting module 24 for generating a driving power according to the rectified power, and outputting the driving power to the light emitting module 24, and The current flow time of the rectifier 21 is changed to increase the power factor of the alternating current power. In the present embodiment, the power factor corrector 22 is a back-moving valley fill power factor corrector, but in other embodiments, the power factor corrector 22 can be an active power factor corrector.

The current control module 23 is electrically connected to the power factor corrector 22 to receive the driving power, and is electrically connected to the second and third connecting ends 262 and 263 of the light emitting module 24 for using the voltage amplitude according to the driving power from the second A current is drawn from a target connection terminal of the third connection terminals 262, 263.

In the present embodiment, the current control module 23 includes first and second current regulators 2311, 2312, first and second switches 2321, 2322, and a switch control unit 233.

The first and second current regulators 2311, 2312 are electrically connected to the second and third connection ends 262, 263 of the light emitting module 24, respectively. The Mth current regulator is operable to draw current from the M+1th connection and to adjust the magnitude of the current drawn. In this embodiment, the current amplitude ratios of the first and second current regulators 2311, 2312 are substantially 1:1.

The first and second switches 2321, 2322 are electrically connected to the first and second current regulators 2311, 2312, respectively. Each switch 2321, 2322 is controlled to switch between conducting and non-conducting. The Mth current regulator draws current from the M+1th connection when the Mth switch is turned on, and does not draw current from the M+1th connection when the Mth switch is not turned on.

The switch control unit 233 is electrically connected to the power factor corrector 22 to receive the driving power, and is electrically connected to the switches 2321, 2322 for controlling the switches 2321, 2322 according to the voltage amplitude of the driving power so that one corresponding to the target connection end The target switch is turned on and the remaining switches are not turned on. In this embodiment, the switch control unit 233 includes four resistors 2331 to 2334, a Zener diode 2335, and a diode 2336.

The voltage of the drive power is as shown by curve 271, and the brightness of the illumination module 24 is as shown by curve 272. The operation of the driving circuit 20 of this embodiment can be divided into two stages, which are the first and second stages I and II, respectively. The two phases are described in detail below.

Phase I

When the voltage amplitude of the driving power is greater than the sum of the forward voltage amplitudes Vf1, Vf2 of the first and second lighting units 251, 252, the voltage of the driving power is sufficient to cause the Zener diode 2335 to collapse and drive the voltage of the power. The difference between the breakdown voltage of the Zener diode 2335 and the voltage breakdown of the Zener diode 2335 is sufficient to turn on the second switch 2322. At this time, the diode 2336 makes the first switch 2321 non-conductive, and the second current regulator 2312 The third connection end 263 of the illumination module 24 (ie, the target connection end) draws current, so that the first and second illumination units 251, 252 have a current flowing (the current amplitude is determined by the second current regulator 2312), thereby The light is emitted, and the brightness of the light emitting module 24 is proportional to the current amplitude determined by the second current regulator 2312 and the total number of the light emitting diodes 250 of the first and second light emitting units 251, 252.

Second stage II

When the voltage amplitude of the driving power is greater than the forward voltage amplitude Vf1 of the first lighting unit 251, but smaller than the sum of the forward voltage amplitudes Vf1, Vf2 of the first and second lighting units 251, 252, the voltage of the driving power The second switch 2322 is not enough to be turned on, but after the voltage is divided by the resistors 2331 and 2332, the first switch 2321 is turned on. At this time, the first current regulator 2311 is connected from the second connection end 262 of the light-emitting module 24 (ie, the target connection). The current is drawn so that the first light-emitting unit 251 has a current flowing (the current amplitude is determined by the first current regulator 2311) to emit light, and the brightness of the light-emitting module 24 is proportional to the first current regulator 2311. The current amplitude, and the number of the light emitting diodes 250 of the first light emitting unit 251.

In this embodiment, since the current amplitude ratios of the first and second current regulators 2311, 2312 are substantially 1:1, and the first and second light emitting units The ratio of the total number of the light-emitting diodes 250 of 251 to 252 to the number of the light-emitting diodes 250 of the first light-emitting unit 251 is 2:1, so the brightness of the light-emitting module 24 in the first and second stages I and II The ratio is essentially 2:1.

The driving circuit 20 of this embodiment has the following advantages:

(1) By the power factor corrector 22, the power factor of the alternating current power can be increased.

(2) The illumination module 24 is continuously illuminated, and there is no point-off phenomenon in which the AC power is doubled. The user does not feel the eye discomfort during long-term use, and the average brightness of the illumination module 24 can be improved.

Preferably, in other embodiments, when the first and second light emitting units 251, 252 of the light emitting module 24 respectively include P1 and P2 light emitting diodes 250, the first and second current regulators 2311, 2312 The current amplitude ratio is designed to be substantially (P1+P2): P1, so that the luminance ratio of the illumination module 24 in the first and second phases I and II is substantially 1:1, which can further enhance the user. Eye comfort for long-term use.

Second preferred embodiment

Referring to FIG. 5 and FIG. 6, a second preferred embodiment 30 of the driving circuit of the present invention is used to drive a lighting module 34. The light emitting module 34 includes first to sixth light emitting units 351 to 356, and first to seventh connecting ends 361 to 367. The Mth light emitting unit is electrically connected between the Mth and M+1th connecting ends, M=1, 2, . . . , 6. Each of the light emitting units 351 to 356 includes at least one light emitting diode 350.

The driving circuit 30 of this embodiment comprises a rectifier 31, a power factor corrector 32 and a current control module 33. The rectifier 31 and the power factor corrector 32 are identical to the rectifier 21 (see FIG. 3) of the first preferred embodiment, respectively, and the power factor correction The device 22 (see Figure 3) is not described here.

The current control module 33 is electrically connected to the power factor corrector 32 to receive the driving power, and is electrically connected to the second to seventh connecting ends 362-367 of the light emitting module 34 for using the voltage amplitude according to the driving power from the second A current is drawn to a target connection terminal of the seventh connection terminals 362-367.

In the present embodiment, the current control module 33 includes first to sixth current regulators 3311 to 3316, first to sixth switches 3321 to 3326, and a switch control unit 333.

The first to sixth current regulators 3311 to 3316 are electrically connected to the second to seventh connection terminals 362 to 367 of the light emitting module 34, respectively. The Mth current regulator is operable to draw current from the M+1th connection and to adjust the magnitude of the current drawn.

The first to sixth switches 3321 to 3326 are electrically connected to the first to sixth current regulators 3311 to 3316, respectively. Each switch 3321~3326 is controlled to switch between conducting and non-conducting. The Mth current regulator draws current from the M+1th connection when the Mth switch is turned on, and does not draw current from the M+1th connection when the Mth switch is not turned on.

The switch control unit 333 is electrically connected to the power factor corrector 32 to receive the driving power, and is electrically connected to the switches 3321 to 3326 for controlling the switches 3321 to 3326 according to the voltage amplitude of the driving power so that one corresponding to the target connection end The target switch is turned on and the remaining switches are not turned on.

The voltage of the drive power is as shown by curve 371, and the brightness of the illumination module 34 is as shown by curve 372. The operation of the driving circuit 30 of this embodiment can be divided into six stages, which are the first to sixth stages I to VI, respectively. The following details the six stage.

Phase I

When the voltage amplitude of the driving power is greater than the sum of the forward voltage amplitudes Vf1 VVf6 of the first to sixth lighting units 351-356, the sixth switch 3326 is turned on, and the remaining switches 3321 to 3325 are not turned on, and the sixth current regulator is turned on. 3316 draws current from the seventh connection end 367 (ie, the target connection end) of the light-emitting module 34, so that current flows through the first to sixth illumination units 351-356 (the current amplitude is determined by the sixth current regulator 3316), Thereby, the light is emitted, and the brightness of the light-emitting module 34 is proportional to the current amplitude determined by the sixth current regulator 3316, and the total number of the light-emitting diodes 350 of the first to sixth light-emitting units 351-356.

Second stage II

When the voltage amplitude of the driving power is greater than the sum of the forward voltage amplitudes Vf1 to Vf5 of the first to fifth lighting units 351 to 355, but smaller than the forward voltage amplitude Vf1 of the first to sixth lighting units 351 to 356 When the sum of Vf6 is reached, the fifth switch 3325 is turned on, the remaining switches 3321~3324, 3326 are not turned on, and the fifth current regulator 3315 draws current from the sixth connection end 366 (ie, the target connection end) of the light emitting module 34, so that the first The fifth light-emitting units 351-355 have a current flowing (the current amplitude is determined by the fifth current regulator 3315) to emit light, and the brightness of the light-emitting module 34 is proportional to the current amplitude determined by the fifth current regulator 3315. And the total number of the light emitting diodes 350 of the first to fifth light emitting units 351 to 355.

Third stage III

When the voltage amplitude of the driving power is greater than the first to fourth lighting units When the sum of the forward voltage amplitudes Vf1 to Vf4 of 351 to 354 is smaller than the sum of the forward voltage amplitudes Vf1 to Vf5 of the first to fifth light emitting units 351 to 355, the fourth switch 3324 is turned on, and the remaining switches 3321~ The third current regulator 3314 draws current from the fifth connection end 365 of the illumination module 34 (ie, the target connection end), so that current flows through the first to fourth illumination units 351-354 ( The current amplitude is determined by the fourth current regulator 3314) to emit light, and the brightness of the light-emitting module 34 is proportional to the current amplitude determined by the fourth current regulator 3314, and the first to fourth light-emitting units 351-354 The total number of light emitting diodes 350.

Fourth stage IV

After the third phase III, the voltage amplitude of the driving power is greater than the sum of the forward voltage amplitudes Vf1 VVf3 of the first to third lighting units 351-353, but smaller than the first to fourth lighting units 351-354. When the sum of the forward voltage amplitudes Vf1 V Vf4, the third switch 3323 is turned on, the remaining switches 3321, 3322, 3324~3326 are not turned on, and the third current regulator 3313 is connected from the fourth connection end 364 of the light emitting module 34 (ie, the target The connection terminal draws current, so that the first to third light-emitting units 351-353 have a current flowing (the current amplitude is determined by the third current regulator 3313), thereby emitting light, and the brightness of the light-emitting module 34 is proportional to the third current. The current amplitude determined by the regulator 3313 and the total number of the light emitting diodes 350 of the first to third light emitting units 351 to 353.

Fifth stage V

After the fourth phase IV, the voltage amplitude of the driving power is greater than the sum of the forward voltage amplitudes Vf1, Vf2 of the first and second lighting units 351, 352, but smaller than the first to third lighting units 351-353 Forward voltage amplitude When the sum of Vf1~Vf3 is the same, the second switch 3322 is turned on, the remaining switches 3321, 3323~3326 are not turned on, and the second current regulator 3312 draws current from the third connection end 363 (ie, the target connection end) of the light emitting module 34, so that The first and second light emitting units 351 and 352 have a current flowing (the current amplitude is determined by the second current regulator 3312) to emit light, and the brightness of the light emitting module 34 is proportional to the current determined by the second current regulator 3312. The amplitude, and the total number of light emitting diodes 350 of the first and second light emitting units 351, 352.

Sixth stage VI

After the fifth phase V, the voltage amplitude of the driving power is greater than the forward voltage amplitude Vf1 of the first lighting unit 351, but smaller than the forward voltage amplitudes Vf1 to Vf4 of the first to fourth lighting units 351-354. In the sum, the first switch 3322 is turned on, and the remaining switches 3322~3262 are not turned on, and the first current regulator 3311 draws current from the second connection end 362 (ie, the target connection end) of the light-emitting module 34, so that the first light-emitting unit 351 has The current flows (the current amplitude is determined by the first current regulator 3311) to emit light, and the brightness of the light emitting module 34 is proportional to the current amplitude determined by the first current regulator 3311, and the light emitted by the first light emitting unit 351. The number of diodes 350.

The driving circuit 30 of this embodiment has the following advantages:

(1) By the power factor corrector 32, the power factor of the alternating current power can be increased.

(2) The illumination module 34 is continuously illuminated, and there is no point-off phenomenon in which the AC power is doubled. The user does not feel the eye discomfort during long-term use, and the average brightness of the illumination module 24 can be improved.

Preferably, the first to sixth illuminations can be appropriately adjusted in the design stage. The number of the light-emitting diodes 350 included in each of the units 351 to 356, and the magnitude of the current drawn by the first to sixth current regulators 3311 to 3316, respectively, so that the light-emitting module 34 is in the first to sixth stages. I~VI has a small change in brightness, which further enhances the user's eye comfort during long-term use.

(3) The operation of the light-emitting module 34 in more stages can reduce the voltage across the first to sixth current regulators 3311 to 3316, thereby reducing power loss and improving efficiency.

Third preferred embodiment

Referring to Figure 7, a third preferred embodiment 30' of the novel drive circuit is similar to the second preferred embodiment 30 (see Figure 5) except for the current control module 33'.

In this embodiment, the current control module 33' is configured to draw current from at least one of the second to seventh connection terminals 362-367 according to the voltage amplitude of the driving power, and includes the first and the first Two switches 3321', 3322'. The first switch 3321' is electrically connected to the first to third current regulators 3311 to 3313. The second switch 3322' is electrically connected to the fourth to sixth current regulators 3314 to 3316. The Mth current regulator draws current from the M+1th connection terminal when the corresponding switch is turned on and the voltage amplitude of the driving power is sufficient to make the Mth illumination unit pass the conduction; otherwise, the current is not extracted from the M+1 connection end. Current. The switch control unit 333' is electrically connected to the switches 3321', 3322' for controlling the switches 3321', 3322' according to the voltage amplitude of the driving power, so that a target switch corresponding to the target connection is turned on, and the remaining switches are turned on. Not conductive.

When the second switch 3322' is turned on, the first switch 3321' is not turned on, driving When the voltage amplitude of the power is sufficient to make the first to sixth lighting units 351 to 356 pass the conduction, the fourth to sixth current regulators 3314 to 3316 respectively reach the fifth to seventh connection ends 365 to 367 of the light emitting module 34. (ie, the target connection end) draws current, so that the first to sixth illumination units 351-356 have a current flowing, thereby emitting light, and the brightness of the illumination module 34 is determined by the fourth to sixth current regulators 3314 to 3316. The current amplitude and the number of light-emitting diodes 350 of the first to sixth light-emitting units 351 to 356 are affected.

When the second switch 3322' is turned on, the first switch 3321' is not turned on, and the voltage amplitude of the driving power is sufficient to make the first to fifth lighting units 351-355 pass through, but not enough to make the sixth lighting unit 356 pass through. The fourth and fifth current regulators 3314 and 3315 respectively draw currents from the fifth and sixth connection ends 365, 366 (ie, target connection ends) of the light-emitting module 34, so that the first to fifth light-emitting units 351-355 The current flowing through, thereby emitting light, and the brightness of the light-emitting module 34 is controlled by the fourth and fifth current regulators 3314, 3315, and the light-emitting diodes 350 of the first to fifth light-emitting units 351-355 The number of influences.

When the second switch 3322' is turned on, the first switch 3321' is not turned on, and the voltage amplitude of the driving power is sufficient to make the first to fourth light emitting units 351-354 pass smoothly, but not enough to make the fifth and sixth light emitting units 355 When the 356 is in the forward direction, the fourth current regulator 3314 draws current from the fifth connection end 365 of the illumination module 34 (ie, the target connection end), so that current flows through the first to fourth illumination units 351-354, thereby The light is emitted, and the brightness of the light-emitting module 34 is affected by the current amplitude determined by the fourth current regulator 3314 and the number of the light-emitting diodes 350 of the first to fourth light-emitting units 351-354.

When the first switch 3321' is turned on, the second switch 3322' is not turned on, and the voltage amplitude of the driving power is sufficient to make the first to third light emitting units 351-353 pass through, but not enough to make the fourth to sixth light emitting units 354 When the ~356 is in the forward direction, the first to third current regulators 3311 to 3313 respectively draw currents from the second to fourth connection ends 362 to 364 (ie, the target connection ends) of the light emitting module 34, so that the first to third The light-emitting units 351-353 have a current flowing therethrough to emit light, and the brightness of the light-emitting module 34 is controlled by the first to third current regulators 3311 to 3313 and the first to third light-emitting units 351-353. The number of light-emitting diodes 350 is affected.

When the first switch 3321' is turned on, the second switch 3322' is not turned on, and the voltage amplitude of the driving power is sufficient to make the first and second light emitting units 351, 352 pass through, but not enough to make the third to sixth light emitting units 353 When the first and second current regulators 3311, 3312 respectively draw current from the second and third connection ends 362, 363 (ie, target connection ends) of the light-emitting module 34, so that the first and second The light-emitting units 351 and 352 have a current flowing therethrough to emit light, and the brightness of the light-emitting module 34 is controlled by the first and second current regulators 3311 and 3312 and the first and second light-emitting units 351 and 352. The number of light-emitting diodes 350 is affected.

When the first switch 3321' is turned on, the second switch 3322' is not turned on, and the voltage amplitude of the driving power is sufficient to make the first light emitting unit 351 pass through, but not enough to make the second to sixth light emitting units 352-356 pass through. The first current regulator 3311 draws current from the second connection end 362 of the illumination module 34 (ie, the target connection end), so that the first illumination unit 351 has a current flowing, thereby emitting light, and the brightness of the illumination module 34 is affected. The first current regulator 3311 is determined The predetermined current amplitude and the number of the light emitting diodes 350 of the first light emitting unit 351 are affected.

It should be noted that in other embodiments, the current control module 33' may include more than two switches, but the number of switches must be less than the number of current regulators, and each switch may be electrically connected less than three or more. Multiple current regulators.

Fourth preferred embodiment

Referring to FIG. 8 and FIG. 9, a fourth preferred embodiment 40 of the driving circuit of the present invention is used to drive a lighting module 44. The light emitting module 44 includes first to third light emitting units 451 to 453, and first to fourth connecting ends 461 to 464. The first light emitting unit 451 is electrically connected between the first and second connection ends 461, 462. The second light emitting unit 452 is electrically connected between the second and third connection ends 462, 463. The third lighting unit is electrically connected between the first and fourth connecting ends 461, 464. Each of the light emitting units 451 to 453 includes at least one light emitting diode 450. In the present embodiment, the first to third light emitting units 451 to 453 have the same number of light emitting diodes 450.

The driving circuit 40 of this embodiment includes a rectifier 41, a power factor corrector 42 and a current control module 43. The rectifier 41 and the power factor corrector 42 are identical to the rectifier 21 (see FIG. 3) and the power factor corrector 22 (see FIG. 3) of the first preferred embodiment, respectively, and will not be further described herein.

The current control module 43 is electrically connected to the power factor corrector 42 to receive the driving power, and is electrically connected to the third and fourth connecting ends 463, 464 of the light emitting module 44 for using the voltage amplitude according to the driving power from the third A current is drawn from a target connection terminal of the fourth connection ends 463, 464.

In the present embodiment, the current control module 43 includes first and second current regulators 4311, 4312, first and second switches 4321, 4322, and a switch control unit 433.

The first and second current regulators 4311, 4312 are electrically connected to the third and fourth connection ends 463, 464 of the light emitting module 44, respectively. The Mth current regulator is operable to draw current from the M+2 connection and adjust the magnitude of the current drawn, M=1,2. In this embodiment, the current amplitude ratio of the first and second current regulators 4311, 4312 is substantially 1:2.

The first and second switches 4321, 4322 are electrically coupled to the first and second current regulators 4311, 4312, respectively. Each switch 4321, 4322 is controlled to switch between conducting and non-conducting. The Mth current regulator draws current from the M+2 connection when the Mth switch is turned on, and does not draw current from the M+2 connection when the Mth switch is not conducting.

The switch control unit 433 is electrically connected to the power factor corrector 42 to receive the driving power, and is electrically connected to the switches 4321, 4322 for controlling the switches 4321, 4322 according to the voltage amplitude of the driving power so that one corresponding to the target connection end The target switch is turned on and the remaining switches are not turned on.

The voltage of the drive power is as shown by curve 471, and the brightness of the illumination module 44 is as shown by curve 472. The operation of the driving circuit 40 of this embodiment can be divided into two stages, which are the first and second stages I and II, respectively. The two phases are described in detail below.

Phase I

When the voltage amplitude of the driving power is greater than the sum of the forward voltage amplitudes Vf1, Vf2 of the first and second lighting units 451, 452, the first switch 4321 leads The second switch 4322 is not turned on, and the first current regulator 4311 draws current from the third connection end 463 of the illumination module 44 (ie, the target connection end), so that current flows through the first and second illumination units 451 and 452. (the current amplitude is determined by the first current regulator 4311) to emit light, and the brightness of the light-emitting module 44 is proportional to the current amplitude determined by the first current regulator 4311, and the first and second light-emitting units 451, 452 The total number of light-emitting diodes 450.

Second stage II

When the voltage amplitude of the driving power is greater than the forward voltage amplitude Vf3 of the third lighting unit 453, but smaller than the sum of the forward voltage amplitudes Vf1, Vf2 of the first and second lighting units 451, 452, the second switch 4322 When the first switch 4321 is not turned on, the second current regulator 4312 draws current from the fourth connection end 464 of the illumination module 44 (ie, the target connection end), so that the third illumination unit 453 has a current flowing (current) The amplitude is determined by the second current regulator 4312, thereby emitting light, and the brightness of the light-emitting module 44 is proportional to the current amplitude determined by the second current regulator 4312, and the light-emitting diode 450 of the third light-emitting unit 453 number.

In this embodiment, since the current amplitude ratio of the first and second current regulators 4311, 4312 is substantially 1:2, and the total number of the light emitting diodes 450 of the first and second light emitting units 451, 452 The ratio of the number of the light-emitting diodes 450 of the third light-emitting unit 453 is 2:1, so the luminance ratio of the light-emitting module 44 in the first and second stages is substantially 1:1. Of course, in other embodiments, the number of the LEDs 450 and the first and second currents included in each of the first to third illumination units 451 453 453 of the illumination module 44 can be adjusted. Current amplitude ratio of regulators 4311, 4312 For example, the brightness ratio of the light-emitting module 34 in the first and second stages I and II is not 1:1.

The driving circuit 40 of this embodiment has the following advantages:

(1) By the power factor corrector 42, the power factor of the alternating current power can be increased.

(2) The illumination module 44 is continuously illuminated, and there is no point-off phenomenon in which the AC power is doubled. The user does not feel the eye discomfort during long-term use, and the average brightness of the illumination module 44 can be improved.

Fifth preferred embodiment

Referring to Figure 10, a fifth preferred embodiment 40' of the novel drive circuit is similar to the fourth preferred embodiment 40 (see Figure 8), except for the current control module 43'.

In the present embodiment, the current control module 43' further includes a diode 434. The diode 434 has an anode electrically connected to the second connection end 462 of the light emitting module 44, and a cathode electrically connected to the fourth connection end 434 of the light emitting module 44.

When the voltage amplitude of the driving power is greater than the sum of the forward voltage amplitudes Vf1, Vf2 of the first and second lighting units 451, 452, the first switch 4321 is turned on, the second switch 4322 is not turned on, and the first current regulator 4311 is turned on. Extracting current from the third connection end 463 (ie, the target connection end) of the light emitting module 44, so that current flows through the first and second light emitting units 451, 452 (the current amplitude is determined by the first current regulator 4311), thereby Glowing.

When the voltage amplitude of the driving power is greater than the forward voltage amplitudes Vf1, Vf3 of the first and third lighting units 451, 453 (both substantially the same), but less than When the forward voltage amplitudes Vf1 and Vf2 of the first and second light emitting units 451 and 452 are summed, the second switch 4322 is turned on, and the first switch 4321 is not turned on. At this time, the second current regulator 4312 is emitted from the light emitting module 44. The fourth connection end 464 (ie, the target connection end) draws current such that current flows through the first and third illumination units 451, 453 (the total current amplitude is determined by the second current regulator 4312) to illuminate.

However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention cannot be limited thereto, that is, the simple equivalent change and modification made by the novel patent application scope and the novel description content, All remain within the scope of this new patent.

10‧‧‧Drive circuit

11‧‧‧ Full Bridge Rectifier

12‧‧‧ Current Regulator

13‧‧‧Lighting module

131‧‧‧First connection

132‧‧‧second connection

133‧‧‧Lighting diode

141, 142‧‧‧ Curve

20‧‧‧Drive circuit

21‧‧‧Rectifier

22‧‧‧Power Corrector

23‧‧‧ Current Control Module

2311, 2312‧‧‧ Current Regulator

2321, 2322‧‧ ‧ switch

233‧‧‧Switch control unit

2331~2334‧‧‧resistance

2335‧‧‧Zina diode

2336‧‧‧ diode

24‧‧‧Lighting module

251, 252‧‧ ‧ lighting unit

250‧‧‧Lighting diode

261~263‧‧‧Connector

271, 272‧‧‧ curve

30, 30'‧‧‧ drive circuit

31‧‧‧Rectifier

32‧‧‧Power Corrector

33, 33'‧‧‧ Current Control Module

3311~3316‧‧‧ Current Regulator

3321~3326‧‧‧Switch

3321’, 3322’‧‧‧ switch

333, 333'‧‧‧ switch control unit

34‧‧‧Lighting Module

351~356‧‧‧Lighting unit

350‧‧‧Lighting diode

361~367‧‧‧Connecting end

371, 372‧‧‧ Curve

40, 40'‧‧‧ drive circuit

41‧‧‧Rectifier

42‧‧‧Power Corrector

43, 43'‧‧‧ Current Control Module

4311, 4312‧‧‧ Current Regulator

4321, 4322‧‧ ‧ switch

433‧‧‧Switch control unit

434‧‧‧dipole

44‧‧‧Lighting module

451~453‧‧‧Lighting unit

450‧‧‧Lighting diode

461~464‧‧‧Connecting end

471, 472‧‧‧ Curve

1 is a circuit diagram illustrating a conventional driving circuit for driving a lighting module; FIG. 2 is a timing diagram illustrating a rectified power voltage generated by the driving circuit of FIG. 1, and the lighting mode of FIG. FIG. 3 is a circuit diagram illustrating a first preferred embodiment of the driving circuit of the present invention for driving a lighting module; FIG. 4 is a timing diagram illustrating the first preferred embodiment of FIG. The voltage of a driving power and the brightness of the lighting module of FIG. 3; FIG. 5 is a circuit diagram illustrating a second preferred embodiment of the driving circuit of the present invention for driving a lighting module; FIG. 6 is a timing diagram The voltage of a driving power generated by the second preferred embodiment of FIG. 5 and the brightness of the lighting module of FIG. 5; FIG. 7 is a circuit diagram showing the third preferred embodiment of the driving circuit of the present invention. The embodiment is used to drive a lighting module; FIG. 8 is a circuit diagram illustrating a fourth preferred embodiment of the driving circuit for driving a lighting module; FIG. 9 is a timing diagram illustrating the first embodiment of FIG. The voltage of a driving power generated by the fourth preferred embodiment and the brightness of the lighting module of FIG. 8; and FIG. 10 is a circuit diagram illustrating a fifth preferred embodiment of the driving circuit of the present invention for driving an illumination mode group.

20‧‧‧Drive circuit

21‧‧‧Rectifier

22‧‧‧Power Corrector

23‧‧‧ Current Control Module

2311, 2312‧‧‧ Current Regulator

2321, 2322‧‧ ‧ switch

233‧‧‧Switch control unit

2331~2334‧‧‧resistance

2335‧‧‧Zina diode

2336‧‧‧ diode

24‧‧‧Lighting module

251, 252‧‧ ‧ lighting unit

250‧‧‧Lighting diode

261~263‧‧‧Connector

Claims (8)

a driving circuit for driving a light emitting module, the light emitting module comprising first to Nth light emitting units, and first to N+1th connecting ends, wherein the Mth light emitting unit is electrically connected to the Mth and Mth Between the +1 terminals, each of the light emitting units includes at least one light emitting diode, N 2, M=1, 2, ..., N, the driving circuit comprises: a rectifier receiving an alternating current power from the outside for rectifying the alternating current power to generate a rectified power; a power factor corrector, Electrically connected to the rectifier to receive the rectified power, electrically connected to the first connection end of the lighting module, for generating a driving power according to the rectified power, outputting the driving power to the lighting module, and changing the rectifier a current passing time to increase a power factor of the alternating current power; and a current control module electrically connected to the power factor corrector to receive the driving power and electrically connected to the second to N+1 of the lighting module The connecting end is configured to draw current from at least one of the second to the N+1th connecting ends according to the voltage magnitude of the driving power. The driving circuit of the first aspect of the invention, wherein the current control module comprises: first to Nth current regulators respectively electrically connected to the second to N+1th terminals of the lighting module, The Mth current regulator is operable to draw current from the M+1th connection and adjust a magnitude of the drawn current; first to Nth switches electrically connected to the first to Nth currents, respectively a regulator, each switch is controlled to switch between conducting and non-conducting, and the Mth current regulator draws current from the M+1th connection when the Mth switch is turned on, and the Mth switch does not conduct when the Mth switch is turned on Not drawing current from the M+1th connection; and a switch control unit electrically connected to the power factor corrector to receive the drive power, electrically connected to the switches for voltage amplitude according to the drive power The values control the switches such that a target switch corresponding to the target connection is turned on and the remaining switches are not turned on. According to the driving circuit described in claim 1 of the patent application, N 3, wherein the current control module comprises: first to Nth current regulators respectively electrically connected to the second to N+1th terminals of the lighting module, the Mth current regulator is operable to The M+1 connection terminal draws current and adjusts the amplitude of the drawn current; the first to the Lth switches, each switch is electrically connected to at least one of the current regulators, and is controlled to be turned on and off. Switching between, the Mth current regulator draws current from the (M+1)th connection when the corresponding switch is turned on and the voltage of the driving power is sufficient to make the Mth light emitting unit pass the conduction; otherwise, Not drawing current from the M+1th connection, 1<L<N; and a switch control unit electrically connected to the power factor corrector to receive the drive power, electrically connected to the switches for driving according to the The voltage amplitude of the power controls the switches such that a target switch corresponding to the target connection is turned on and the remaining switches are not turned on. The driving circuit according to claim 1, wherein the power factor corrector is a valley filling factor corrector. a driving circuit for driving a light emitting module, the light emitting module comprising first to third light emitting units and first to fourth connecting ends, wherein the first light emitting unit is electrically connected to the first and second connecting ends The second light emitting unit is electrically connected between the second and third connecting ends, the third light emitting unit is electrically connected between the first and fourth connecting ends, and each of the light emitting units includes at least one light emitting diode The driving circuit comprises: a rectifier for receiving an alternating current power from the outside for rectifying the alternating current power to generate a rectified power; a power factor corrector electrically connected to the rectifier to receive the rectified power, the electric a first connection end connected to the light emitting module, configured to generate a driving power according to the rectified power, output the driving power to the lighting module, and change a current circulation time of the rectifier to increase the power of the alternating current power And a current control module electrically connected to the power factor corrector to receive the driving power, electrically connected to the third and fourth terminals of the light emitting module, according to the driving power Pressure amplitude from the third and the fourth connection terminal is a terminal connected to draw current target. The driving circuit of claim 5, wherein the current control module comprises: first and second current regulators respectively electrically connected to the third and fourth terminals of the light emitting module, the first The M current regulator is operable to draw current from the M+2 connection and adjust the magnitude of the current drawn, M=1, 2; first and second switches are respectively electrically connected to the first and second current regulators, each switch is controlled to switch between conduction and non-conduction, and the Mth current regulator is in the When the M switch is turned on, current is drawn from the M+2 connection terminal, and when the Mth switch is not turned on, current is not drawn from the M+2 connection terminal; a switch control unit is electrically connected to the power factor correction Receiving the driving power, electrically connecting to the switches, and controlling the switches according to the voltage amplitude of the driving power, so that a target switch corresponding to the target connection is turned on, and the remaining switches are not turned on. . The driving circuit of claim 6, wherein the current control module further comprises: a diode having an anode electrically connected to the second connection end of the lighting module, and an electrical connection to the a cathode of the fourth connection end of the light emitting module. The driving circuit according to claim 5, wherein the power factor corrector is a valley filling factor corrector.