TWI508616B - Electronic control gears for led light engine with switchable ac input voltage range and application thereof - Google Patents

Description

Electronic control device for LED light engine with switchable AC input voltage range and application thereof

The invention relates to a light-emitting diode light engine control device, in particular to a light-emitting diode light engine electronic control device for different voltage sources, and the switchable light-emitting diode array chain is illuminated in parallel or in series.

Compared to conventional luminaires, LEDs have a high luminous efficacy. Traditional bulbs provide about 15 lumens per watt (15 lumens per watt), while light-emitting diodes have up to 100 lumens per watt (100 lumens per Above watt), the light-emitting diode has the advantages of longer relative life, less interference from outside interference and less damage, and is the first choice for lighting equipment.

However, the light-emitting diode requires direct current driving, and the commercial power is alternating current. Therefore, a full-wave/half-wave rectifier is first required to rectify the alternating current into direct current. In addition, depending on the specifications of the AC power in different countries, when the lighting device is used in different countries, it is often necessary to switch through a buck/boost converter to convert the voltage source into The voltage that the lighting device can withstand, otherwise it is easy to have the input voltage is too low to light or the input voltage is too high to burn the bulb.

It is not convenient for the user to carry an additional voltage converter. On the other hand, when manufacturing a lighting device, the manufacturer needs to produce a corresponding lighting device for the voltage specifications of the alternating current in different countries, and also increases the complexity and manufacturing cost of the process.

Therefore, simplifying the circuit and process complexity and reducing the manufacturing cost is one of the main topics in the development of the light-emitting diode light source. Embodiments of the present invention provide a light-emitting diode light source that can be directly used for an AC circuit of different voltages, and has the advantages of low manufacturing cost, excellent performance, non-damage, and simple circuit, as will be described later.

The electronic control device of the LED light engine with switchable AC input voltage range proposed by the invention can be used for different AC power sources, can be used for AC power in different countries without an additional voltage converter, and has simple circuit and manufacture. Low cost and other advantages.

The invention provides an electronic control device for an LED light engine with a switchable AC input voltage range, which can manually or automatically switch two sets of LED arrays in series or in parallel according to different alternating currents.

An electronic control device for an LED light engine having a switchable AC input voltage range according to an embodiment of the present invention includes two current regulators, a switching unit, and a switch controller. An electronic control device having an LED light engine with a switchable AC input voltage range is connected to two sets of LED arrays to form a light-emitting diode lighting device capable of switching AC voltage sources.

A current regulator that adjusts the input current wave to form a quasi-sinusoidal square wave or step wave waveform to effectively increase the power factor.

The switching unit is configured to control the two sets of LED arrays in parallel or in series. In a first embodiment, only one switching unit is provided at the cathode of the first LED array chain and the anode of the second LED array chain. In a second embodiment, a first switching unit is disposed on a cathode of the first LED array, a second switching unit is disposed on an anode of the second LED array, and the first switching unit and the second switching unit are connected in series. .

The switching controller controls the switching unit according to the detected value of the external AC voltage source. The present invention provides a mode of manual switching and automatic switching. Manual switching is performed by the user depending on the voltage source. Automatic switching is performed by the switching controller to detect the input voltage for switching. The switching mode has a latch circuit. When the switching controller detects the instantaneous voltage of the voltage source and compares it with a threshold voltage, the latch circuit can lock the LED array corresponding to the voltage source. The series-parallel lighting mode of the chain prevents the switching of the parallel/serial connection when the instantaneous voltage of the sine wave of the high-voltage source is passed from the bottom to the top or from the top to the bottom.

In an embodiment, a switch controller can be used to automatically switch between the parallel mode and the series mode by using a latch circuit. The switching controller detects the rectified AC voltage and determines whether the instantaneous voltage reaches a threshold voltage. 180V can be set as the threshold voltage, which is considered as the AC voltage boundary in the range of 115 volts (V) to 230 (V). If the switching controller detects an AC voltage of 115V, its instantaneous voltage can never reach the threshold voltage (180V), the latch circuit is idle, and the two sets of electronic control devices maintain the parallel configuration. If the switching controller detects an AC voltage of 230V, the instantaneous voltage will go through the preset threshold voltage (180V) from the bottom to the top of the sine wave or from top to bottom. The latch circuit will lock the two sets of electronic control. The series configuration of the device avoids bouncing between the two sets of electronic control devices in parallel and series configuration. The voltage values of 115V, 180V, and 230V described in the embodiments of the present invention are for illustrative purposes and are not intended to limit the present invention.

AC‧‧‧AC voltage source

10, 20‧‧‧ Lighting devices

100‧‧‧Rectifier

120, 140‧‧‧Switch controller

R1, R2‧‧‧ current regulator

G1, G2‧‧‧Light Diode Array Chain

G11, G12, G13, G21, G22, G23‧‧‧ LED array

S11, S12, S21, S22‧‧‧ bypass switch

T11, T12, T21, T22‧‧‧ detectors

Ra, Ra', r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, rd, rd'‧‧

C1, C2‧‧‧ capacitor

D1, D2, D3, D4, D5‧‧‧ diodes

E1, E2, F1, F2‧‧‧ joints

L‧‧‧Latch circuit

S0, B1, B2, B3, B4‧‧‧ transistors

S1, S2‧‧‧ switching unit

P1, P2, P3, P4‧‧ path

X‧‧‧ shunt regulator

Z1, Z2‧‧‧ Crash diode

1A is a schematic diagram showing the circuit architecture of a lighting device according to an embodiment of the present invention. The lighting device 10 includes an electronic control device having an LED light engine capable of switching an AC input voltage range and an external first LED array chain. G1 and second LED array chain G2. FIG. 1A is a diagram for explaining a switching principle of parallel and series connection of two sets of LED arrays by using an electronic control device having an LED light engine with a switchable AC input voltage range. When the voltage source is low, the switching controller 120 switches the first switching unit S1 between the two groups of LED arrays to the first contact E1, and switches the second switching unit S2 to the first contact F1. The two sets of LED arrays are lit in parallel. When the voltage source is high, the switching controller 120 switches the first switching unit S1 between the two groups of LED arrays to the second node E2, and switches the second switching unit S2 to the second node F2. The two sets of light emitting diode array chains are caused to illuminate in series.

FIG. 1B is a schematic diagram showing a method of paralleling two sets of LED arrays at a low voltage source according to the electronic control device of the LED light engine having the switchable AC input voltage range according to FIG. 1A. The first LED array G1 draws current through the path P1, and the second LED array G2 draws current through the path P2 to make the two groups of LED arrays connected in parallel.

FIG. 1C is a schematic diagram showing a method of connecting two sets of LED array chains in a high voltage source according to the electronic control device of the LED light engine having the switchable AC input voltage range according to FIG. 1A. The first LED array G1 and the second LED array G2 are connected in series through the path P3.

1D is a schematic diagram of a specific circuit embodiment of the illumination device in accordance with FIG. 1A. In FIG. 1D, a schematic diagram of a specific circuit embodiment of FIG. 1A is applied to a light-emitting diode array chain that is hierarchically lit and stepped out. In the first half cycle of a cycle, the input voltage is increased, and the bottom-up manner is performed. The level of the LED array, the input current is stepped up in a sinusoidal step wave manner; in the second half of a cycle, as the input voltage drops, the LED array is turned off step by step from top to bottom, and the input current is The sinus step mode is stepped down to improve the power factor. In this embodiment, the switching controller 120 is manually controlled.

1E is a circuit diagram showing another embodiment of an electronic control unit having an LED light engine having a switchable AC input voltage range in accordance with FIG. 1A. In this embodiment, the switching controller 120 can automatically determine the level of potential provided by the external voltage source, and correspondingly control the series and parallel connection of the two groups of LED arrays.

2A is a schematic diagram showing the circuit architecture of a lighting device according to another embodiment of the present invention. The lighting device 10 includes an electronic control device having an LED light engine that can switch the AC input voltage range and an external LED array chain. FIG. 2A is a diagram illustrating another parallel and series switching principle of two sets of LED array chains. When the voltage source is low, the switching controller 140 switches the first switching unit S1 between the two sets of LED arrays to the first contact E1 to be grounded, and turns on the second LED array G2 coupling. Connected to the current regulator R2, the two sets of LED arrays are lit in parallel. At a high voltage source, the switching controller 140 switches the first switching unit S1 between the two sets of LED arrays to the second The contact point E2 is turned off, and the current regulator R2 coupled to the second LED array G2 is turned off, so that the two groups of LED arrays are lit in series.

FIG. 2B is a schematic diagram showing the method of paralleling two sets of LED arrays at a low voltage source according to the electronic control device of the LED light engine having the switchable AC input voltage range according to FIG. 2A. The first LED array G1 draws current through the path P1, and the second LED array G2 transmits current through the path P2.

2C is a schematic diagram showing a method of connecting two sets of LED array chains in a high voltage source according to the electronic control device of the LED light engine having the switchable AC input voltage range according to FIG. 2A. The first LED array G1 and the second LED array G2 are illuminated in series through the path four P4.

2D is a circuit diagram showing an embodiment of an electronic control unit of the LED light engine having a switchable AC input voltage range in accordance with FIG. 2A. In this embodiment, the switching controller 140 can automatically determine the level of the potential provided by the voltage source, and correspondingly control the series and parallel connection of the two groups of LED arrays.

Traditionally, the voltage used for the AC voltage source is a sinusoidal waveform, which must be rectified into a pulsating DC waveform before it can be applied to a light-emitting diode illumination device. However, the range of voltage rms values of alternating currents in various countries is not the same. Generally speaking, it can be roughly divided into a low voltage source of 100 volts (V) to 120V and a high voltage source of 200V to 240V. In the case of a lighting device, the input voltage range of its applicable voltage source needs to be considered in the manufacturing process, and the circuit structure is designed accordingly. However, if the lighting device is designed to misuse an unsuitable voltage source, it may not be used or burned.

For example, when applied to a 115V illuminator, 230V AC may cause the circuit to burn out due to excessive input voltage. For 230V illuminators, 115V AC may be used because of the input voltage. Low and cannot be lit normally. That is to say, once the conventional lighting device is manufactured, it can only be applied to a single voltage input specification. If it is required to use different voltage input specifications, an external voltage converter is required, which is inconvenient for the user. For manufacturers, it is also necessary to respond to electricity in different countries. Pressure input specifications, design of suitable lighting devices, due to the need to design different specifications of lighting devices, increase process complexity and manufacturing costs.

The lighting strategy of the present invention is to illuminate two sets of LED arrays in parallel when the two sets of LED arrays are low voltage sources (115V AC voltage source) according to the detected value of the input voltage. Chain; when it is a high voltage source (230V AC voltage source), the two sets of LED arrays are illuminated in series, so that a single illumination device can be applied to different ranges of input voltage, which is simple and simple. Process complexity is also an advantage for users to use more conveniently.

At the same time, in order to improve the power factor, an embodiment of the present invention can use a current regulator to adjust the current through the LED array chain, so that the phase and waveform of the total current approach the phase and waveform of the input voltage, thereby effectively improving the power factor.

FIG. 1A illustrates an illumination device including an electronic control device having an LED light engine that can switch an AC input voltage range and an external LED array chain basic structure according to an embodiment of the invention. As shown in FIG. 1A, the control device of the switching LED light engine includes a first current regulator R1, a second current regulator R2, and a control module. The first current regulator R1 and the second current regulator R2 are used to provide load current and limit the maximum output current to avoid damaging the load circuit.

The first current regulator R1 and the second current regulator R2 are disposed on the anode of the first LED array G1 and the anode of the second LED array G2, but are not limited thereto. The first current regulator R1 is electrically connected to the external voltage source and coupled to the anode or cathode of the external first LED array G1. Moreover, the second current regulator R2 can be electrically connected to the external voltage source and coupled to the anode or cathode of the external second LED array G2.

The control module includes a first switching unit S1, a second switching unit S2 and a switching controller 120. The second contact E2 of the first switching unit S1 is electrically connected (short-circuited) to the second contact E2 of the second switching unit S2. . The first switching unit S1 is coupled to the cathode of the first LED array G1 and is controlled by the switching controller 120 to switch between the first contact E1 and the second contact E2 according to the instantaneous voltage of the input voltage. The second switching unit S2 is coupled to the anode of the second LED array G2, and is switched to the first contact according to the instantaneous voltage of the input voltage. F1 and the second contact F2. The switching controller 120 can be a control circuit (automatic switching) or a switching switch (manual switching).

The external voltage source is, for example, an AC voltage source (a sine wave of AC), which can provide an AC voltage (low voltage source) with a voltage effective value of, for example, 115V to 120V, or a voltage effective value of, for example, 230V to 240V. The AC voltage (high voltage source) is rectified by the rectifier 100 to become a pulsating DC wave signal to be supplied as an input voltage to the LED array chain.

FIG. 1B is a schematic diagram showing the method of paralleling two groups of LED arrays at a low voltage source according to the electronic control device of the LED light engine having the switchable AC input voltage range according to FIG. 1A. When the input voltage is a low voltage source, the switching controller 120 (shown in FIG. 1A) controls the first switching unit S1 to switch to the first contact E1, so that the first LED array G1 passes through the first switching unit S1. Grounded via the first contact E1 (path one P1). Moreover, the switching controller 120 can control the second switching unit S2 to switch to the first contact F1, so that the second LED array G2 receives the input voltage through the second switching unit S2 via the first contact F1 (path two) P2). As a result, the first light-emitting diode array chain G1 and the second light-emitting diode array chain G2 are lit in parallel.

FIG. 1C is a schematic diagram showing the method of connecting two sets of LED array chains in series with a high voltage source according to the electronic control device of the LED light engine having the switchable AC input voltage range of FIG. 1A. When the input voltage is a high voltage source, the switching controller 120 (shown in FIG. 1A) controls the first switching unit S1 to switch to the second contact to the second contact E2, and adjusts the second switching unit S2 to switch to the second The second contact F2 is such that the first LED array G1 and the second LED array G2 pass through the second junction E2 of the first switching unit S1 and the second contact F2 of the second switching unit S2. (The second contact E2 and the second contact F2 are short-circuited) and connected in series (path three P3). As a result, the first light-emitting diode array chain G1 and the second light-emitting diode array chain G2 are lit in series.

1D is a schematic diagram of a specific circuit embodiment of the illumination device in accordance with FIG. 1A. In this embodiment, the switching controller 120 is, for example, a six-pin or four-leg mechanical switch. The switching controller 120 can be manually controlled, that is, in the form of a known alternating current (voltage range of the alternating current), the user can input the power according to the voltage source. The range of pressure is controlled by the switching controller 120 to control the position of the joint of the switching unit. When a low voltage source is provided, the first switching unit S1 can be switched to the first contact E1 and the second switching unit S2 can be switched to the first contact F1 to connect the two sets of electronic control devices (ie, the light emitting diode) The array chains G1 and G2) are lit in parallel. When a high voltage source is provided, the first switching unit S1 can be switched to the second contact E2 and the second switching unit S2 can be switched to the second contact F2 to connect the two sets of electronic control devices (ie, the light emitting diode) The array chains G1 and G2) are lit in series. The manner of parallel lighting and series lighting (current path) has been respectively described in FIG. 1B and FIG. 1C, and details are not described herein again.

In FIG. 1D, a schematic diagram of a specific circuit embodiment of the LED array chain of FIG. 1A to FIG. 1C is applied, which uses a switching regulator chain to control the corresponding LED array chain. The switching regulator chain is formed by a series of switching regulators. In addition to the last stage LED array, a switch regulator is connected in parallel with an LED array. The switching regulator includes a bypass switch (S11, S12, S21, S22, hereinafter referred to as Si) and a detector (T11, T12, T21, T22, hereinafter referred to as Ti), and a bypass switch (Si) is detected by the detector ( The control of Ti) is switched to an ON state, a Regulating state, and an OFF state. Initially, set all switching regulators of the switching regulator chain to closed (conducting).

In the first half cycle of the first cycle, the input voltage rises, and the bypass switch (Si) is controlled by the detector (Ti), from bottom to top, from the on state to the regulated state, and then to the off state. The LED array is illuminated step by step from bottom to top. In the half cycle after one cycle, the input voltage drops, and the bypass switch (Si) is controlled by the detector (Ti), from top to bottom, stepwise from the off state to the regulated state, and then converted to the on state, so that the LED The array is extinguished step by step from top to bottom, then re-cycled, and so on.

Specifically, the first LED array G1 and the second LED array G2 may include any form of LED array chain, and are not limited to the hierarchical illumination and the stepwise extinction shown in FIG. 1D. A form of a light-emitting diode array chain.

The current regulator R1 and the current regulator R2 comprise a transistor switch, such as a metal oxide semiconductor field effect transistor (as a switch), a transistor switch and a shunt regulator or an npn bipolar junction transistor (switch control) The circuit is connected in series and controlled by it. Parallel adjustment A series circuit of a rectifier or an npn bipolar junction transistor is used to control the turn-on and turn-off of the metal oxide semiconductor field effect transistor. The current regulator R1 and the current regulator R2 may be disposed at an anode or a cathode of the LED array chain.

1E is a circuit diagram showing another embodiment of an electronic control unit having an LED light engine having a switchable AC input voltage range in accordance with FIG. 1A. In this embodiment, the first switching unit S1 and the second switching unit S2 are respectively an N-channel Metal-Oxide-Semiconductor Field-Effect Transistor (MOSFET) and a pnp-type bipolar junction. Transistor (Bipolar Junction Transistor, BJT). Of course, the first switching unit S1 and the second switching unit S2 can also be implemented by using other transistors, which are not limited.

The switching controller 120 of this embodiment is automatically controlled, that is, the switching controller 120 can detect the input voltage of the voltage source and automatically determine the low voltage source or the high voltage source according to the input voltage. When the voltage source is low, the switching controller 120 switches the first switching unit S1 and the second switching unit S2 between the two groups of LED arrays to the first contacts E1 and F1, respectively, so that the two groups of electronic control The devices (ie, the LED array chains) are illuminated in parallel. When the voltage source is high, the switching controller switches the first and second switching units S1 and S2 between the two groups of LED arrays G1 and G2 to the second contacts E2 and F2, respectively, so that the two groups of electronic control The devices (ie, the LED array chain) are illuminated in series.

The switching controller 120 includes a voltage dividing circuit (including a resistor r1 and a resistor r2), a shunt regulator X, a transistor S0, a diode D1, a diode D2, a diode D3, a breakdown diode Z1, and a crash II. Polar body Z2.

The voltage dividing circuit (resistor r1 and resistor r2) is coupled between the external voltage source and the grounding point, and the voltage dividing node of the voltage dividing circuit (resistor r1 and resistor r2) is connected to the parallel regulator X through the diode D1. The RC circuit formed by the pole (R), the resistor r3 and the capacitor C1 is connected between the reference pole (R) and the anode (A) of the shunt regulator X. By using the voltage dividing ratio of the voltage dividing circuit (resistor r1 and resistor r2), the conduction and the cutoff of the path between the anode (A) and the cathode (K) of the shunt regulator X can be switched, and the embodiment of the present invention controls the threshold voltage at Between 130-190 volts (V), such as but not limited to 180V.

When the input voltage is lower than the threshold voltage, the shunt regulator X is turned off, the diodes D2 and D3 are reverse biased, and the transistor S0 is turned on by the control of the resistor r5 and the Zener diode Z1. The transistor of a switching unit S1 is turned on by the control of the resistor r6 and the Zener diode Z2, and the diode D4 is reverse biased. The cathode of the first LED array G1 is connected to the ground terminal, and the voltage dividing circuit (resistance) R7, r8) are turned on, the bipolar junction transistor B1 as the second switching unit S2 is turned on, and the anode of the second LED array G2 is connected to the input voltage source through the second current regulator R2, the first light emitting diode The polar body array chain G1 is electrically connected in parallel with the second light emitting diode array chain G2.

When the input voltage is higher than the threshold voltage, the shunt regulator X is turned on, the diodes D2 and D3 are turned off, the transistor S0 is turned off, and the voltage dividing circuit (resistors r7, r8) is turned off, as the transistor of the first switching unit S1 is turned off. The diode D4 is turned off, and the bipolar junction transistor B1 as the second switching unit S2 is turned off, and the first LED array G1 is connected to the second current regulator R2 through the diode D4 to connect the second illumination. The anode of the polar body array chain G2, the first light emitting diode array chain G1 and the second light emitting diode array chain G2 are connected in series.

The latch circuit L is disposed between the switching controller 120 and the second LED array G2 for locking the input voltage to 230V or 115V, corresponding to the series-parallel state of the LED array chain, to avoid The sine wave at the high voltage source (230V) continuously switches between the series and parallel lighting modes as the voltage waveform is converted (above the threshold voltage or below the threshold voltage). When the input voltage source is lower than the threshold voltage, the shunt regulator X is always turned off, the latch circuit L is turned off, and the first light emitting diode array chain G1 and the second light emitting diode array chain G2 are constantly lit in parallel; When the input voltage source is higher than the threshold voltage, the shunt regulator X is turned on, and the latch circuit L is turned on. And, during the period in which the AC input voltage is lower than the threshold voltage, the latch circuit L maintains the conduction of the parallel regulator X, the first LED array G1 and the second LED array G2. Constantly lit in series.

The latch circuit L of this embodiment includes a diode D5, a capacitor C2, a transistor B2 (for example, a bipolar junction transistor), a resistor r9, and a voltage dividing circuit (a resistor r10 and a resistor r11 in series). The second LED array G2 is connected to the anode of the diode D5, and the cathode of the diode D5 is connected to the cathode of the shunt regulator X of the switching controller 120 through a voltage dividing circuit (the resistor r10 and the resistor r11 connected in series); The cathode of the diode D5 is connected to the reference pole of the shunt regulator X through the bipolar junction transistor B2 and the resistor r9, and the base of the bipolar junction transistor B2 is connected to the voltage divider circuit (the resistor r10 and the resistor r11 in series) The node, and the cathode of the diode D5 are connected to the ground through the capacitor C2.

When the input voltage of the AC voltage source is always lower than the threshold voltage (when the input voltage source is 115V), the node is divided by the voltage dividing circuit (resistor r1 and resistor r2) during the non-no-load time, the diode D1 is biased, capacitor C1 is charged, but the node voltage divider of the voltage divider circuit (resistor r1 and resistor r2) is not enough to reach the reference voltage of the shunt regulator X, and the shunt regulator X is always off. In addition, the diode D5 is biased, the capacitor C2 is charged, the turn-off of the shunt regulator X causes the transistor B2 to be turned off, and the latch circuit L is idle.

When the AC voltage source is a high voltage source (in the case where the input voltage source is 230V), there is a case where the voltage is lower than the threshold voltage and higher than the threshold voltage during the period of the sine wave.

When the first input voltage rises above the threshold voltage, the diode D1 is biased, the potential across the capacitor C1 is maintained at the reference potential Vref, the shunt regulator X is turned on, the diode D5 is biased, and the voltage dividing circuit is passed through R10 and the resistor r11) turn on the transistor B2, the capacitor C2 is charged, and the shunt regulator X and the transistor B2 are locked in an on state. Specifically, when the input voltage is first raised to the threshold voltage, the first LED array G1 and the second LED array G2 are switched from parallel lighting to series lighting, and then the parallel regulator The X and the transistor B2 are interlocked in an on state, so that the first LED array G1 and the second LED array G2 are kept in series.

The principle that the shunt regulator X and the transistor B2 are locked to each other is explained below. When the input voltage is higher than the threshold voltage, the diode D1 is biased, the diode D5 is biased, the capacitor C2 is charged, and the capacitor C1 is charged until its voltage reaches the reference voltage Vref (the charging current flows through the diodes D1 and D5) The shunt regulator X is turned on, and the transistor B2 is turned on through the voltage dividing circuit (resistor r10 and resistor r11); when the input voltage drops below the threshold voltage, and the non-idle time, the diode D1 is reverse biased, The diode D5 is biased, the capacitor C2 is charged, the capacitor C1 is still maintained at the reference voltage Vref (the charging current flows through the diode D5), the parallel regulator X is maintained, and the transistor B2 is turned on; when the input voltage drops to the empty During the load time, the diode D1 is reverse biased, the diode D5 is reverse biased, the capacitor C2 is discharged, the capacitor C1 is still maintained at the reference voltage Vref (the charging current is provided by the capacitor C2), the shunt regulator X is maintained to conduct, and the transistor is maintained. B2 is turned on.

In an embodiment, the shunt regulator X can also use a Silicon Controlled Rectifier (SCR), a junction field effect transistor (JFET), a gold oxide half field effect transistor (MOSFET), or a bipolar junction transistor ( Bipolar Transistor, BJT) to replace. in parallel The reference pole of the regulator X, the gate rectifier and the gate field effect transistor and the base of the gate or bipolar junction transistor of the metal oxide half field effect transistor can be used as a control pole to determine the shunt regulator X, Turn-on or turn-off of the voltage controlled rectifier and the junction field effect transistor and the MOS field effect transistor or the bipolar junction transistor.

2A is a schematic diagram showing the circuit architecture of a lighting device 20 according to another embodiment of the present invention. The lighting device includes an electronic control device having an LED light engine that can switch the AC input voltage range and an external light emitting diode array chain. FIG. 2A is a diagram illustrating another parallel and series switching principle of two sets of LED arrays. The same points as those in FIG. 1A are not described again. The main difference is that the current path does not pass the second current when the series is turned on. Regulator R2. When the voltage source is low, the switching controller 140 switches the first control unit S1 between the two sets of LED arrays to the first contact E1 to be grounded, and turns on the second LED array G2 coupling. The second current regulator R2 is connected to cause the two groups of LED arrays to be lit in parallel. When the voltage source is high, the switching controller 140 switches the first control unit S1 between the two sets of LED arrays to the second contact E2, and the second LED array G2 is coupled to the second LED array. The second current regulator R2 causes the two sets of light emitting diode array chains to illuminate in series. The switching controller 140 can be either automatically controlled or manually controlled.

The control module includes a first switching unit S1 and a switching controller 140. The first switching unit S1 is coupled to the cathode of the first LED array G1 and controlled by the switching controller 140 to switch between the first contact E1 and the second contact E2. The second contact E2 of the first switching unit S1 is electrically connected to the anode of the second LED array G2. The switching controller 140 can be a control circuit (automatic switching) or a switching switch (manual switching).

The first current regulator R1 and the second current regulator R2 are electrically connected to the external voltage source, and the first current regulator R1 and the second current regulator R2 can be disposed at the anode of the external LED array chain or cathode. The detailed circuit principle has been explained before, and will not be described here.

FIG. 2B is a schematic diagram showing the method of illuminating the illuminating device 20 of the electronic control device of the LED light engine with the switchable AC input voltage range according to FIG. 2A, and connecting the two sets of LED array chains at a low voltage source. Referring to FIG. 2B, when the voltage source is low, the switching controller 140 (shown in FIG. 2A) controls the first switching unit S1 to switch to the first contact E1, so that The first light-emitting diode array chain G1 is grounded through the first switching unit S1 via the first contact E1 (path one P1). Moreover, the switching controller 140 regulates the second current regulator R2 to be turned on, so that the second LED array G2 is turned on by the second current regulator R2 to receive the input voltage (path two P2). As a result, the first light-emitting diode array chain G1 and the second light-emitting diode array chain G2 are lit in parallel.

2C is a schematic diagram of a method for illuminating a two-group LED array chain in series with a high voltage source in accordance with the illumination device 20 of the electronic control unit of the LED light engine having the switchable AC input voltage range of FIG. 2A. Referring to FIG. 2C, at a high voltage source, the switching controller 140 (shown in FIG. 2A) regulates the switching of the first switching unit S1 to the second contact E2, and regulates the cutting of the second current regulator R2 to make the first illuminating. The diode array chain G1 is coupled to the anode of the second LED array G2 through the second junction E2 of the first switching unit S1 (path four P4). As a result, the first light-emitting diode array chain G1 and the second light-emitting diode array chain G2 are lit in series.

2D is a schematic diagram of a specific circuit embodiment of the illumination device in accordance with FIG. 2A. In this embodiment, the manner of parallel lighting and series lighting (current path) has been separately illustrated in FIG. 2B and FIG. 2C, and details are not described herein again.

In Fig. 2D, a hierarchically lit and stepped extinguished LED array is applied to the specific circuit of Fig. 2A. Of course, the first light emitting diode array chain G1 and the second light emitting diode array chain G2 may include any form of light emitting diode array chain. Further, the first switching unit S1 is a metal oxide half field effect transistor (MOSFET). Of course, the first switching unit S1 can also be implemented by using other transistors, and is not limited.

The switching controller 140 includes a voltage dividing circuit (including a resistor r1 and a resistor r2), a shunt regulator X, a transistor S0, a diode D1, a diode D2, a diode D3, a breakdown diode Z1, and a crash II. Polar body Z2. In this embodiment, the switching controller 140 (shown in FIG. 2A) is, for example, an automatically controlled circuit device.

The voltage dividing circuit (resistor r1 and resistor r2) is coupled between the external voltage source and the grounding point, and the voltage dividing node of the voltage dividing circuit (resistor r1 and resistor r2) is connected to the parallel regulator X through the diode D1. The pole (R), the RC circuit formed by the resistor r3 and the capacitor C1 is connected between the reference pole (R) and the anode (A) of the shunt regulator X. Using a voltage divider circuit (resistor r1 and resistor r2) The partial pressure ratio can switch the conduction and the cutoff of the path between the anode (A) and the cathode (K) of the shunt regulator X.

When the input voltage is lower than the threshold voltage, the shunt regulator X is turned off, and D3 is reverse biased. The transistor as the first switching unit S1 is turned on by the control of the resistor r6 and the Zener diode Z2, and the diode D4 is reverse biased. The cathode of a light-emitting diode array chain G1 is connected to the ground. In addition, the transistor of the first switching unit S1 is turned on, D2 is biased, the transistor S0 is turned off, the voltage dividing circuit (resistors r7, r8) has no current, the transistor B3 is turned off, and the second LED array G2 is turned off. The anode is connected to the input voltage source through the second current regulator R2, so that the first LED array G1 and the second LED array G2 are electrically connected in parallel.

When the input voltage is higher than the threshold voltage, the shunt regulator X is turned on, the diode D3 is turned off, the transistor as the first switching unit S1 is turned off, the diode D4 is biased, the diode D2 is reverse biased, and the transistor S0 is The gate is turned on by the control of the resistor r5 and the breakdown diode Z1, and the node of the voltage dividing circuit (resistors r7, r8) provides a voltage division to control the conduction of the transistor B3, so that the second current regulator R2 is galvanic and semi-electric. The gate potential of the crystal is pulled low and turned off. In this way, the first LED array G1 is connected to the anode of the second LED array G2 through the diode D4, and the first LED array G1 and the second LED array G2 are connected. Connected in series.

The latch circuit L is disposed between the switching controller 140 and the second LED array G2 for locking the input voltage to 230V or 115V, thereby avoiding continuously switching the series and parallel points with voltage waveform conversion. The bright mode, the principle of which has been explained before, will not be described again. During the period in which the AC input voltage is lower than the threshold voltage during the AC input voltage, the latch circuit L maintains the conduction of the shunt regulator X, and the first LED array G1 and the second LED array G2 are constantly Lights up in series. Only when the first input voltage rises above the threshold voltage, the first LED array G1 and the second LED array G2 are switched from parallel lighting to series lighting, and then the parallel regulator X is constantly conducting. , avoid switching.

Specifically, the control device of the switched LED light engine of the embodiment of the present invention can be integrated into an integrated circuit, or can be designed into different integrated circuits by modules, and then integrated into a circuit. There are no restrictions on the board. For example, in one embodiment, the rectifier, the current regulator, and the bypass switch can be integrated into an integrated circuit.

The control device of the switched light-emitting diode light engine of the embodiment of the present invention can further be combined with the light-emitting diode array chain as a lighting device.

The control device for the LED light engine of the above embodiment of the present invention, the illumination device and the lamp using the same, according to the detection value of the input voltage, are low voltage sources, and illuminate two groups of LED arrays in parallel The chain, when it is a high voltage source, illuminates the LED array chain in series, so that a single illumination device can be applied to different ranges of input voltages, has the advantage of simple circuit, and the user does not need to use an additional voltage converter. It can be used, it is very convenient.

The principles, preferred embodiments, and modes of operation of the invention have been described in the foregoing. However, the invention should not be construed as being limited to the specific embodiments discussed. Rather, the above-described embodiments are to be considered as illustrative and not restrictive, and the scope of the invention as defined by the following claims Changes are made to these embodiments.

AC‧‧‧AC voltage source

10‧‧‧Lighting device

100‧‧‧Rectifier

R1, R2‧‧‧ current regulator

G1, G2‧‧‧Light Diode Array Chain

E1, E2, F1, F2‧‧‧ joints

S1, S2‧‧‧ switching unit

Claims (18)

A control device for a switching LED light engine, comprising: a first current regulator for electrically connecting one of the external first LED array chains and connected to an external voltage source; a current regulator for electrically connecting one of the external second LED array chains, and the cathode of the second LED array chain is electrically grounded; a control module coupled to the first LED The first array switching unit includes a first switching unit for controlling a cathode connection end of the first LED array chain or the second illumination a diode array is connected in series; a second switching unit is configured to control an anode of the second LED array chain to be connected to the external voltage source or in series with the first LED array chain; and a switching controller The first switching unit and the second switching unit are coupled to control switching between the first switching unit and the second switching unit, and a latch circuit coupled to the second LED Body array chain and the switching controller The switching controller controls the first switching unit and the second switching unit at a low voltage source such that the first LED array link is connected to the ground, and the second LED array chain Connecting the external voltage source, the first LED array chain is connected in parallel with the second LED array; and when a high voltage source is used, the switching controller controls the first switching unit and the second switching The first light emitting diode array chain is connected in series with the second light emitting diode array chain, the external voltage source is the low voltage source or the high voltage source, wherein the switching controller detects the external voltage The instantaneous voltage of the source is compared with a threshold voltage. When the switching controller detects that the voltage of the external voltage source does not reach the threshold voltage, the latch circuit locks the first LED array chain and the first a two-light diode array chain parallel lighting mode, when the switching controller detects the instantaneous voltage of the external voltage source to reach the threshold voltage, the latch circuit locks the first LED array chain and the first Two light dipole Chain tandem array lighting mode. The control device of the switched light-emitting diode light engine according to claim 1, The first switching unit has a first contact and a second contact, the second switching unit has a first contact and a second contact, and the first switching unit is coupled to the first LED array a cathode of the chain, the second switching unit is coupled to the anode of the second LED array, and the second contact of the first switching unit is short-circuited with the second contact of the second switching unit. When the first switching unit controls the cathode connection end of the first LED array chain, it is regarded as switching to the first contact of the first switching unit, and when the first switching unit controls the first illumination When the diode array chain is connected in series with the second LED array chain, it is regarded as switching to the second contact of the first switching unit, and when the second switching unit controls the second LED array chain When the anode is connected to the external voltage source, it is regarded as switching to the first contact of the second switching unit, and when the second switching unit controls the anode of the second LED array chain and the first LED When the array chain is connected in series, it is regarded as switching to the second switching unit The second point. The control device of the switching light-emitting diode light engine of claim 1, wherein the first switching unit is an N-channel enhancement type transistor, and the anode of the N-channel enhancement type transistor is coupled to the A cathode of the first LED array chain, a source of the N-channel enhancement transistor is grounded, and a gate of the N-channel enhancement transistor is controlled by the switching controller. The control device of the switched light-emitting diode light engine of claim 1, wherein the switching controller is configured to detect and determine that the voltage provided by the external voltage source reaches a threshold voltage And the voltage source provided by the external voltage source is less than the threshold voltage. The switching controller includes: a first voltage dividing circuit coupled between the external voltage source and the ground point, the first The voltage dividing circuit has a voltage dividing point; a parallel regulator, a bipolar junction transistor, a junction field effect transistor, a gold oxide half field effect transistor or a voltage controlled rectifier, having a control pole, a An anode and a cathode, the control electrode is coupled to the voltage dividing point, the anode is grounded, and the control is substantially the reference pole of the parallel regulator, the base of the bipolar junction transistor or the step-controlled rectifier, the junction field a first transistor having a first capacitor coupled to the control electrode; a transistor having a first end coupled to the second switching unit, the transistor The second end is coupled to the ground and the gate of the transistor The pole is coupled to the parallel regulator, the bipolar junction transistor, The junction field effect transistor, the MOS field effect transistor or the 矽-controlled rectifier; a first diode, the cathode of the first diode is coupled to the parallel regulator, the bipolar junction transistor The junction field effect transistor, the MOS field effect transistor or the 矽 control rectifier, and the anode of the first diode is coupled to the first voltage dividing circuit; and a second diode, a cathode of the second diode is coupled to the parallel regulator, the bipolar junction transistor, the junction field effect transistor, the MOS field effect transistor or the cathode of the 矽 control rectifier, and the second The anode of the diode is coupled to the gate of the transistor; a third diode, the cathode of the third diode is coupled to the parallel regulator, the bipolar junction transistor, and the junction field effect a cathode, the MOS field effect transistor or the cathode of the 矽-controlled rectifier, and an anode of the third diode is coupled to a gate of the first switching unit; a first collapsed diode, the first collapse a cathode of the diode is coupled to the gate of the transistor, and an anode of the first collapsed diode is grounded; and a second collapse Body, the cathode of the second diode is coupled to collapse gate electrode of the first control unit, and the anode of the diode is grounded first crash. The control device of the switched light-emitting diode light engine of claim 1, wherein the first switching unit comprises a further metal oxide half field effect transistor (MOSFET), and the second switching unit comprises a a bipolar junction transistor (BJT), a second voltage divider circuit coupled to the switching controller and the external voltage source, the base of the bipolar junction transistor being coupled to the second voltage divider circuit The emitter of the bipolar junction transistor is coupled to the external voltage source, and the collector of the bipolar junction transistor is coupled to the first switching unit. The control device of the switched light-emitting diode light engine of claim 4, wherein the latch circuit is used to lock the first light-emitting diode when the external voltage source is the high-voltage source The body array chain is electrically connected in series with the second LED array chain, and the latch circuit includes: a fourth diode, the anode of the fourth diode is coupled to the second LED array chain An anode of at least one light-emitting diode above the ground end; a second capacitor connected between the ground end and the cathode of the fourth diode; and another dual-polar junction transistor, the other double The first end of the polarity junction transistor is coupled to the cathode of the fourth diode, and the second end of the other bipolar junction transistor is coupled to the switching controller via a third voltage dividing circuit The shunt regulator, the bipolar junction transistor, the connection a field effect transistor, the MOS field effect transistor or the control electrode of the thyristor and the shunt regulator, the bipolar junction transistor, the junction field effect transistor, the MOS field effect a crystal or the anode of the step-controlled rectifier; and a fourth voltage dividing circuit connected across the switching controller and the first end of the other bipolar junction transistor and providing a voltage division to the other pair The base of the polarity junction transistor. The control device of the switched light-emitting diode light engine of claim 4, wherein the first switching unit, the second switching unit, the switching controller, and the latch circuit comprise: Gold oxide half field effect transistor, junction field effect transistor or bipolar junction transistor. The control device of the switched light-emitting diode light engine according to claim 1, wherein the external voltage source is an AC voltage source for providing an input voltage, and the first LED array chain A rectifier is disposed between the control device of the switching LED light engine, further comprising: a switching regulator chain, comprising a plurality of switching regulators connected in series, connected to the first current regulator, and the same A light-emitting diode array chain is arranged in parallel, and the first and second light-emitting diode array chains comprise a plurality of light-emitting diode array chains connected in series, except for the last-stage light-emitting diode array chain, each switch adjustment The device is connected in parallel with a light-emitting diode array chain, and any of the switching regulators includes a bypass switch and a detector, and any one of the detectors detects the conduction of the next-stage LED array chain and sends a control a signal to switch the state of the bypass switch of the stage, and any of the bypass switches of the stage is an enhanced metal oxide semiconductor field effect transistor, when the input voltage fails to overcome the last stage of the light emitting diode The forward voltage drop of the body array chain, all of the bypass switches of the switching regulator chain are turned off, and when the input voltage overcomes the forward voltage drop of the last stage LED array chain, all of the switching regulator chain is made The bypass switch is turned on, and each stage of the bypass switch is controlled by the control signal of the detector of the stage to switch to the on state, the regulated state, and the off state, wherein the input voltage does not overcome the next level of the LED The forward voltage drop of the array chain, the bypass switch of the stage is turned on, which is called the conduction state, and the current passes through the bypass switch of the current stage to the bypass switch of the next stage; when the input voltage overcomes the forward direction of the chain of the next-level LED array When the voltage drop, but fails to overcome the forward voltage drop of the current LED array chain, the bypass switch of the stage is quickly switched on and off, called the regulation state, and the current passes through the bypass switch of the current stage to the next level of illumination. Polar body array chain; and When the input voltage can overcome the forward voltage drop of the current LED array chain, the bypass switch of the stage is turned off, which is called a cutoff state, and the current passes through the current LED array chain to the next LED. Array chain. A lighting device for a light-emitting diode array chain, comprising: a control device for a switched light-emitting diode light engine according to claim 1; and a light-emitting diode array chain, wherein the light-emitting diode The array chain is disposed in parallel with the control device of the switched light emitting diode light engine. A control device for a switching LED light engine, comprising: a first current regulator for electrically connecting one of the external first LED array chains and connected to an external voltage source; a current regulator for electrically connecting one of the external second LED array chains, and the cathode of the second LED array chain is electrically grounded; a control module coupled to the first LED And the second LED array chain, the control module includes: a switching unit, configured to control a cathode connection end of the first LED array chain or the second LED And a switching controller for controlling switching of the switching unit, and a latch circuit coupled between the second LED array chain and the switching controller, wherein The switching controller controls the switching unit and the second current regulator when the low voltage source is connected, such that the first LED array chain is connected to the ground end, and the second LED array chain is connected to the external Voltage source, the first light emitting diode The array chain is connected in parallel with the second LED array chain; when a high voltage source is used, the switching controller controls the switching unit and the second current regulator such that the first LED array chain and the first The two LED arrays are connected in series, and the external voltage source is the low voltage source or the high voltage source, wherein the switching controller detects the instantaneous voltage of the external voltage source and compares it with a threshold voltage when the switching control The device detects that the instantaneous voltage of the external voltage source does not reach the threshold voltage, and the latch circuit locks the first light-emitting diode array chain and the second light-emitting diode array chain in parallel lighting mode, when the switching Controller detects this The instantaneous voltage of the external voltage source reaches the threshold voltage, and the latch circuit locks the first light emitting diode array chain and the second light emitting diode array chain in series lighting mode. The control device of the switched light-emitting diode light engine of claim 10, wherein the switching unit has a first contact and a second contact, and the switching unit controls the first light-emitting diode array When the cathode of the chain is connected to the ground end, it is regarded as switching to the first contact of the first switching unit, and when the switching unit controls the cathode of the first LED array chain and the second LED array chain When connected in series, it is considered that the switching unit is switched to the second contact of the switching unit, wherein the second contact of the switching unit is coupled to the anode of the second LED array chain. The control device of the switched light-emitting diode light engine of claim 10, wherein the switching unit is an N-channel enhanced transistor, and the first of the N-channel enhanced transistors is coupled to the first A cathode of the LED array chain, a source of the N-channel enhancement type transistor is grounded, and a gate of the N-channel enhancement type transistor is controlled by the switching controller. The control device of the switched light-emitting diode light engine of claim 10, wherein the switching controller is configured to detect and determine that the voltage provided by the external voltage source reaches a threshold voltage is the high voltage source And the voltage source provided by the external voltage source is less than the threshold voltage. The switching controller includes: a first voltage dividing circuit coupled between the external voltage source and the ground point, the first The voltage dividing circuit has a voltage dividing point; a parallel regulator, a bipolar junction transistor, a junction field effect transistor, a gold oxide half field effect transistor or a voltage controlled rectifier, having a control pole, a An anode and a cathode, the control electrode is coupled to the voltage dividing point, the anode is grounded, and the control is substantially the reference pole of the parallel regulator, the base of the bipolar junction transistor or the step-controlled rectifier, the junction field An effect transistor, a gate of the MOS field-effect transistor; a first capacitor coupled to the shunt regulator, the bipolar junction transistor, the junction field effect transistor, the MOS field effect The control of the crystal or the controlled rectifier a transistor, the first end of the transistor is coupled to the second current regulator, the second end of the transistor is coupled to the ground; a first diode, the cathode of the first diode is coupled to the parallel a regulator, the bipolar junction transistor, the junction field effect transistor, the MOS field effect transistor or the 矽-controlled rectifier, and an anode of the first diode is coupled to the first voltage divider circuit ;and a second diode, the anode of the second diode is coupled to the gate of the transistor, and the gate of the transistor is coupled to the first LED array through the second diode a cathode of the third diode, the cathode of the third diode is coupled to the parallel regulator, the bipolar junction transistor, the junction field effect transistor, the MOS field effect transistor or the cathode The cathode of the rectifier is coupled to the cathode of the first diode, and the anode of the first breakdown diode is coupled to the transistor a gate, and an anode of the first collapsed diode is grounded; and a second collapsed diode, the cathode of the second collapsed diode is coupled to the gate of the first switching unit, and the first collapsed second The anode of the polar body is grounded. The control device of the switched light-emitting diode light engine of claim 13, wherein the latch circuit is configured to lock the first light-emitting diode when the external voltage source is the high-voltage source The body array chain is electrically connected in series with the second LED array chain, and the latch circuit includes: a fourth diode, the anode of the fourth diode is coupled to the second LED array chain An anode of at least one light-emitting diode above the ground end; a second capacitor connected between the ground end and the cathode of the fourth diode; and another dual-polar junction transistor, the other double The first end of the polarity junction transistor is coupled to the cathode of the fourth diode, and the second end of the other bipolar junction transistor is coupled to the parallel connection of the switching controller through a voltage dividing circuit a regulator, the bipolar junction transistor, the junction field effect transistor, the anode of the MOS field-effect transistor or the 矽-controlled rectifier, the parallel regulator, the bipolar junction transistor, the connection The field effect transistor, the MOS field effect transistor or the control of the 矽-controlled rectifier And a second voltage dividing circuit connected across the switching controller and the first end of the other bipolar junction transistor and providing a voltage division to the base of the other bipolar junction transistor . The control device of the switched light-emitting diode light engine of claim 13, wherein the switching unit, the switching controller and the latch circuit comprise a gold-oxygen half-field transistor, A field effect transistor or a bipolar junction transistor. The control device of the switched light-emitting diode light engine according to claim 10, wherein the external voltage source is an AC voltage source for providing an input voltage, and the first current regulator is provided. a rectifier and control device of the switched LED light engine The method further includes: a switching regulator chain, comprising a plurality of switching regulators connected in series, connected to the first current regulator, and disposed in parallel with the first LED array, the first and second LEDs The body array chain comprises a plurality of light emitting diode array chains connected in series. Except for the last stage LED array chain, each switching regulator is connected in parallel with a light emitting diode array chain, and any switching regulator includes a side. a switch and a detector, wherein the detector detects a conduction state of the next-stage LED array chain and sends a control signal to switch the state of the bypass switch of the stage, and any one of the stages is bypassed The switch is an enhanced MOSFET field effect transistor. When the input voltage fails to overcome the forward voltage drop of the last stage LED array chain, all of the bypass switches of the switching regulator chain are turned off when the input When the voltage overcomes the forward voltage drop of the last-stage LED array chain, all the bypass switches of the switching regulator chain are turned on, and each stage of the bypass switch is controlled by the detector of the stage. The signal is switched to the on state, the regulated state, and the off state. When the input voltage does not overcome the forward voltage drop of the next-stage LED array chain, the bypass switch of the stage is turned on, which is called an on state, and the current is passed through When the stage bypass switch to the next stage bypass switch; when the input voltage overcomes the forward voltage drop of the next-stage LED array chain, but fails to overcome the forward voltage drop of the current LED array chain, The bypass switch of the stage quickly switches between conduction and cutoff, which is called an adjustment state, and the current passes through the bypass switch of the current stage to the next-stage LED array chain; and when the input voltage can overcome the smoothness of the current LED array When the voltage drops, the bypass switch of the stage is turned off, which is called the off state, and the current flows through the chain of the current LED array to the chain of the next-level LED array. A lighting device for a light-emitting diode array chain, comprising: a control device for a switched light-emitting diode light engine according to claim 10; and a light-emitting diode array chain, wherein the light-emitting diode The array chain is disposed in parallel with the control device of the switched light emitting diode light engine. An integrated circuit of an electronic control device for a light-emitting diode light engine, comprising: a control device for a switched light-emitting diode light engine according to claim 1 or 10; a rectifier for connecting the external voltage source and the control device of the switched LED light engine.