CN102076136B - Drive control circuit of lamp - Google Patents

Abstract

The invention discloses a drive control circuit of a lamp, comprising: a DC voltage supply unit, a driving control unit and a light emitting element group. The DC voltage supply unit provides a supply voltage; the drive control unit is electrically connected with the direct-current voltage supply unit and receives the supply voltage; the light-emitting element group is electrically connected with the drive control unit and is provided with a direct-current voltage output side; the drive control unit generates a constant current, the constant current flows through the light-emitting element group, and a constant voltage is established on the direct current voltage output side of the light-emitting element group for a direct current load.

Description

Lamp drive control circuit

technical field

The invention relates to a driving control circuit of a lamp, in particular to a driving control circuit of a lamp which generates a certain voltage from a light-emitting element group for use by an additional load.

Background technique

The current lamp mainly has a light-emitting element group, which can project light by means of a light-emitting element (such as a light-emitting diode, a light bulb or a lamp tube, etc.) to achieve the purpose of lighting. Since the light-emitting element will generate high heat due to power-on, the current lamp usually must be additionally equipped with a cooling fan or a cooling chip to avoid high heat generated by the light-emitting element group during actual operation, thereby maintaining its normal operation and improving its service life .

It can be seen from the above that, in addition to the load of the light-emitting element group, the current lamp still needs to be connected to a heat-dissipating DC load such as a cooling fan at least. Since the above-mentioned heat-dissipating DC load usually has different power supply voltage requirements than the light-emitting element group, it cannot To avoid this, the current lamp must be designed with multiple sets of output power supplies.

As shown in FIG. 1 , it discloses a drive control circuit for a current lamp, which includes a DC voltage supply unit 91 , a drive control unit 92 and a light emitting element group 93 . The DC voltage supply unit 91 is electrically connected to the drive control unit 92, and the drive control unit 92 is electrically connected to the light emitting element group 93; the DC voltage supply unit 91 generates a first voltage V91 to supply the power required by the drive control unit 92 Controlled by the driving control unit 92, a certain current is generated to flow through the light emitting element group 93, so as to keep the brightness emitted by the light emitting element group 93 constant. In addition, the light-emitting element group 93 has a feedback signal terminal 931, which is connected to the drive control unit 92, and a certain current feedback signal is input to the drive control unit 92, so that the drive control unit 92 can be based on the change of the constant current feedback signal. The current flowing through the light emitting element group 93 is controlled to be constant.

When the constant current flows through the light-emitting element group 93 , high heat will be generated. Therefore, a cooling fan 95 must be installed to discharge heat from the light-emitting element group 93 . Since the cooling fan 95 has a different power supply voltage requirement than the light-emitting element group 93 , the current driving control circuit of the lamp needs to provide another set of power supply for the cooling fan 95 .

As shown in FIG. 1 , the drive control circuit of the current lamp is additionally provided with a voltage stabilizing unit 94 . The voltage stabilizing unit 94 is electrically connected to the drive control unit 92 or can also be connected to the output side of the DC voltage supply unit 91 to receive a DC voltage generated by the drive control unit 92 or a first voltage generated by the DC voltage supply unit 91 V91 is converted to establish a second voltage V92 at an output side of the voltage stabilizing unit 94 to provide the required power for the cooling fan 95 .

However, generally speaking, the driving control circuit technology of the above-mentioned existing lamps will have the following disadvantages: the driving control circuit of the existing lamps needs to add additional circuit components such as the voltage stabilizing unit 94 to generate the second voltage V92 to supply the The required power supply for the cooling fan 95 will result in increased circuit cost and circuit connection complexity.

Based on the above reasons, it is necessary to further improve the driving control circuit of the above-mentioned existing lamps.

Contents of the invention

The purpose of the present invention is to provide a driving control circuit for a lamp, which avoids the addition of additional circuit elements, reduces circuit cost and simplifies circuit connection complexity.

The second object of the present invention is to provide a driving control circuit for lamps, which can simplify the feedback signal terminal circuit and easily expand the function of the circuit by the operation of a digital microcontroller.

Another object of the present invention is to provide a driving control circuit for lamps, which can reduce the installation volume of a transformer with the operation of a digital microcontroller.

According to the driving control circuit of the lamp of the present invention, it includes: a DC voltage supply unit, a driving control unit and a light emitting element group. The DC voltage supply unit provides a supply voltage; the drive control unit is electrically connected to the DC voltage supply unit and receives the supply voltage; the light emitting element group is electrically connected to the drive control unit, and the light emitting element group is provided with a DC voltage output side ; wherein the drive control unit generates a certain current, and the constant current flows through the light-emitting element group, and establishes a certain voltage on the DC voltage output side of the light-emitting element group for use by a DC load.

Compared with the prior art, the present invention has the following advantages:

The drive control circuit of the lamp of the present invention uses the setting of the DC voltage output side of the light-emitting element group to output the constant voltage to the DC load. The voltage stabilizing unit of the second voltage has the effect of reducing circuit cost and circuit connection complexity.

Description of drawings

Figure 1: Schematic diagram of the drive control circuit of the currently used lamps.

Fig. 2: A schematic diagram of the lamp and its drive control circuit according to the first embodiment of the present invention.

Fig. 3: A schematic diagram of a lamp and its drive control circuit according to the second embodiment of the present invention.

[Description of main component symbols]

1 DC voltage supply unit 2 Drive control unit 21 Switch unit

22 Transformer 23 Rectifier filter element 24 Feedback signal terminal isolation unit

3 Light-emitting element groups 31 Feedback signal terminal 32 Light-emitting elements

321 series connection point 33 DC voltage output side 331 first connection end

332 second connection terminal 4 DC load 5 Drive control unit

51 digital microcontroller 511 control signal output terminal 512 feedback control receiving terminal

52 Electronic switch 53 Transformer 54 Rectifier filter element

91 DC voltage supply unit 92 Drive control unit 93 Light-emitting element group

931 Feedback signal terminal 94 Voltage stabilizing unit 95 Cooling fan

Detailed ways

In order to make the above-mentioned and other objects, features and advantages of the present invention more comprehensible, the preferred embodiments of the present invention are specifically cited below, together with the accompanying drawings, and are described in detail as follows:

Please refer to FIG. 2 , which discloses the driving control circuit of the lamp according to the first embodiment of the present invention, which includes a DC voltage supply unit 1 , a driving control unit 2 and a light emitting element group 3 . The DC voltage supply unit 1 is electrically connected to the drive control unit 2, and the drive control unit 2 is electrically connected to the light-emitting element group 3; the DC voltage supply unit 1 receives an external power supply, and uses step-down, rectification and voltage stabilization to operate The output side of the DC voltage supply unit 1 generates a stable supply voltage V1 to supply the power required by the drive control unit 2, and generates a certain current through the control of the drive control unit 2, and the constant current flows through the light emitting element group 3 , so as to keep the luminance emitted by the light emitting element group 3 constant.

The drive control unit 2 is an isolated drive control unit 2, so that the control loop and the power supply loop in the circuit are isolated by appropriate design to ensure the normal operation of the circuit. It has a switch unit 21, a transformer 22, A rectification filter element 23 and a feedback isolation unit 24 . The switching unit 21 is connected to the DC voltage supply unit 1, the primary side of the transformer 22 is electrically connected to the switching unit 21, the rectifying and filtering element 23 is electrically connected to the secondary side of the transformer 22, and an output side of the rectifying and filtering element 23 This light emitting element group 3 is connected.

In this way, the switching unit 21 can receive the supply voltage V1, and switch to generate a first pulse voltage, which is established on the primary side of the transformer 22, and the first pulse voltage is converted on the secondary side of the transformer 22. side generates a second pulse voltage, and supplies the second pulse voltage to the rectification filter element 23, and generates the constant current at an output side of the rectification filter element 23 through conversion of the rectification filter element 23, and the A constant current flows through the light emitting element group 3 . Wherein the transformer 22 adjusts the turns ratio of its primary side and secondary side, so that the transformation/transformation ratio of the first pulse voltage and the second pulse voltage can be appropriately designed according to the load power consumption and power supply characteristics. .

In addition, in order to keep the current flowing through the light-emitting element group 3 constant, the light-emitting element group 3 has a feedback signal terminal 31 connected to the feedback isolation unit 24 of the drive control unit 2, wherein the feedback signal terminal 31 establishes a certain current feedback The signal is input into the feedback isolation unit 24 of the drive control unit 2 , and the constant current is maintained and output through the control of the drive control unit 2 , and circulates through the light emitting element group 3 .

Please refer to Fig. 2 again, the light-emitting element group 3 of the first embodiment of the present invention includes several light-emitting elements 32 and a DC voltage output side 33, and the several light-emitting elements 32 are connected in series, wherein any two light-emitting elements in series 32 form a series connection point 321; similarly, three light-emitting elements 32 in series form two series connection points 321, and so on; therefore, the light-emitting element group 3 of the first embodiment of the present invention is The series connection of 32 will form at least one series connection point 321 .

The DC voltage output side 33 of the light-emitting element group 3 in the first embodiment of the present invention is connected to an additional DC load 4, so as to output a certain voltage V2 to supply the power supply of the DC load 4, wherein the DC load 4 can be a cooling fan. Or a DC motor; the DC voltage output side 33 has a first connection end 331 and a second connection end 332, the first connection end 331 is grounded; A series connection point 321 is connected.

Furthermore, since each light-emitting element 32 of the light-emitting element group 3 has a fixed internal resistance, when the constant current flows through the light-emitting element group 3, a resistance will be established at each of the series connection points 321 relative to a ground terminal. For the constant voltage V2, different series connection points 321 will establish different constant voltages relative to the ground terminal. The user can match the power supply voltage requirements of the DC load 4 and draw it from the appropriate series connection point 321 to connect to the second connection end 332 of the DC voltage output side 33 , and use the DC voltage output side 33 to supply appropriate The constant voltage V2 is given to the power supply of the DC load 4 .

Please refer to FIG. 3, which reveals the drive control circuit of the lamp of the second embodiment of the present invention. Compared with the first embodiment, the difference between the second embodiment and the first embodiment is that a digital control type drive is provided. Control unit 5, the drive control unit 5 includes a digital microcontroller 51 (Micro-Controller Unit, MCU), an electronic switch 52, a transformer 53 and a rectification filter element 54. The digital microcontroller 51 is electrically connected to the DC voltage supply unit 1 to receive the supply voltage V1; the electronic switch 52 is electrically connected to a control signal output terminal 511 of the digital microcontroller 51, therefore, a certain current control signal can be The control signal output terminal 511 is sent to the electronic switch 52 to control the electronic switch 52 for switching operation; the primary side of the transformer 53 is electrically connected to the electronic switch 52; and the secondary side of the transformer 53 is connected to the rectifier filter element 54, and the output side of the rectifying and filtering element 54 is connected to the light-emitting element group 3, so that by means of the switching operation of the electronic switch 52, a first pulse voltage is generated on the primary side of the transformer 53, and is converted in the The secondary side of the transformer 53 generates a second pulse voltage; at the same time, the rectification and filtering element 54 is used to generate the constant current at its output side, and the constant current flows through the light emitting element group 3 . Wherein the electronic switch 52 can be selected as a triode switch.

Moreover, the digital microcontroller 51 of the second embodiment of the present invention also has a feedback control receiving end 512, which is connected to the feedback signal end 31 of the light emitting element group 3, so that the digital microcontroller 51 can receive the feedback control receiving end 512. The current feedback signal is used to control and maintain the driving control unit 5 to output the constant current.

Furthermore, the light-emitting element group 3 of the second embodiment of the present invention can also output the constant voltage V2 to the DC load 4 via its DC voltage output side 33 . When the DC voltage output side 33 of the light emitting element group 3 is connected to the DC load 4, since the DC load 4 is connected in parallel with the DC voltage output side 33 of the light emitting element group 3, part of the constant current will be due to The load effect shunts the current to the DC load 4, causing the constant current to change, and the constant current feedback signal to change. Therefore, in order to maintain the current flowing through the light-emitting element group 3 at a constant value, the second embodiment of the present invention After receiving the constant current feedback signal, the feedback control receiving end 512 of the digital micro-controller 51 controls the driving control unit 5 to increase or decrease the output current according to the change of the current feedback signal, so as to maintain the current flowing in the light emitting element group 3 The current is constant.

Compared with the isolated drive control unit 2 of the first embodiment, the digital control drive control unit 5 of the second embodiment can simplify the feedback circuit and reduce the circuit cost; moreover, the second embodiment utilizes the digital control Since the design of the drive control unit 5 does not need to operate with a large current, relatively only a small-sized transformer 53 can be used for the transformation of voltage and current, so the installation volume of the transformer 53 can be further reduced. . Moreover, the digital microcontroller 51 of the second embodiment of the present invention can also connect and control a controlled terminal of the DC load 4 by means of other additional control terminals. For example, if the DC load 4 is a cooling fan, The digital microcontroller 51 can be used to generate a rotational speed control signal, which is fed into the cooling fan through a controlled terminal of the DC load 4 to control its rotational speed. Therefore, the second embodiment of the present invention utilizes the digital microcontroller The operation of 51 will easily achieve the effect of circuit function expansion without setting an overly complicated speed control circuit.

Furthermore, in order to achieve the effect of highly integrated circuits, the drive control unit 5 or a part thereof, such as the digital microcontroller 51, can also be integrated in a drive circuit board inside the cooling fan as the It is used for the operation control of the cooling fan and the power control of the drive control circuit of the lamp.

In summary, the present invention uses the setting of the DC voltage output side 33 of the light-emitting element group 3 to output the constant voltage V2 to the DC load 4. Compared with the drive control circuit of the current lamp, the present invention does not need to set The active voltage stabilizing unit 94 for generating the second voltage V92 further has the effect of reducing circuit cost and circuit connection complexity.

Claims (8)

1. the Drive and Control Circuit of a light fixture is characterized in that comprising:

A DC voltage feeding unit provides a supply voltage;

A driving control unit is electrically connected this DC voltage feeding unit, and receives this supply voltage; And

A light emitting device group is electrically connected this driving control unit, and this light emitting device group has a DC voltage outlet side;

Wherein electric current is decided in this of driving control unit generation, and this decides this light emitting device group of current flowing, and sets up one for the voltage of deciding of a DC load use at the DC voltage outlet side of this light emitting device group;

This light emitting device group comprises several light-emitting components, and these several light-emitting components are connected in series;

This light emitting device group has at least one and is connected in series a little, and this is connected in series and a little is connected in series by any two light-emitting components and forms;

The DC voltage outlet side of this light emitting device group has first link and second link, this first link ground connection, and this second link then is connected in series with one of them of this light emitting device group and is connected.

2. the Drive and Control Circuit of light fixture according to claim 1, it is characterized in that: this light emitting device group has a feedback signal terminal, connects this driving control unit.

3. the Drive and Control Circuit of light fixture according to claim 1, it is characterized in that: this driving control unit comprises a change-over switch unit, a transformer, a rectifying and wave-filtering element and a feedback isolation unit, this change-over switch unit connects this DC voltage feeding unit, the primary side of this transformer is electrically connected this change-over switch unit, the rectifying and wave-filtering element of this driving control unit is electrically connected the secondary side of this transformer, and the outlet side of this rectifying and wave-filtering element connects this light emitting device group.

4. the Drive and Control Circuit of light fixture according to claim 1, it is characterized in that: this driving control unit comprises a number 8-digit microcontroller, an electronic switch, a transformer and a rectifying and wave-filtering element, this numerical digit microcontroller is electrically connected this DC voltage feeding unit, this electronic switch is electrically connected this numerical digit microcontroller, this transformer primary side is electrically connected this electronic switch, and this Circuit Fault on Secondary Transformer connects this rectifying and wave-filtering element, and the outlet side of this rectifying and wave-filtering element connects this light emitting device group.

5. the Drive and Control Circuit of light fixture according to claim 4, it is characterized in that: this electronic switch is a triode switch.

6. the Drive and Control Circuit of light fixture according to claim 4, it is characterized in that: this numerical digit microcontroller has a FEEDBACK CONTROL receiving terminal in addition, connects a feedback signal terminal of this light emitting device group.

7. the Drive and Control Circuit of light fixture according to claim 4, it is characterized in that: this numerical digit microcontroller has an extra control end in addition, connects a controlled end of this DC load.

8. the Drive and Control Circuit of light fixture according to claim 1, it is characterized in that: this DC load is a radiator fan or a d.c. motor.

Images