LED control circuit and LED lamp

Abstract

The application relates to the technical field of LED control, and discloses an LED control circuit and an LED lamp. The LED control circuit comprises a power supply end, a driving control circuit, a conversion control circuit and a switching circuit. The power supply end provides direct-current power to the driving control circuit and an LED load. When the switching circuit is turned on, the direct-current current output by the power supply end sequentially passes through the LED load, the conversion control circuit and the driving control circuit. The input end of the conversion control circuit is used for connecting a first control signal. The conversion control circuit is used for controlling the turn-on or turn-off of the switching circuit when the first control signal is connected, so as to control the on-off of the LED load. The application controls the turn-on of the LED load by receiving the control signal through the conversion control circuit. The conversion control circuit and the driving control circuit on the direct-current path of the LED load are connected to the same potential reference point. The power supply of the LED load and the control signal of the LED load are not in the same reference plane, and the control can be realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of LED control, and particularly to an LED control circuit and an LED lamp. BACKGROUND

[0002] In the prior art, a light emitting diode (LED) is generally driven in a constant current mode to serve as a lighting lamp, and the brightness of the light emitting diode is controlled in a pulse width modulation (PWM) mode. The use of the light emitting diode for lighting has the advantages of high luminous efficiency, obvious energy-saving effect, long service life, and no pollution.

[0003] At present, in some LED driving power supplies, the power supply of an LED lamp and a control signal of the LED lamp are not in the same reference plane. If a communication path is to be established between them, voltage isolation is needed. Usually, a coupling device such as an optocoupler, an inductor, or a capacitor is used to establish a communication path to achieve the purpose of voltage isolation. The non-common ground signal is transmitted through the coupling device such as the optocoupler, the inductor, or the capacitor. These methods are complex and expensive. SUMMARY

[0004] The present application aims to provide an LED control circuit and an LED lamp to solve one or more technical problems in the prior art and at least provide a beneficial choice or create conditions.

[0005] In a first aspect, an LED control circuit for driving an LED load is provided, comprising a power supply end, a driving control circuit, a conversion control circuit, and a switching circuit.

[0006] The power supply end is connected to the driving control circuit and an anode for connecting the LED load, and provides direct current power to the driving control circuit and the LED load.

[0007] The first end of the switching circuit is used to connect a cathode of the LED load, and the second end of the switching circuit is connected to the driving control circuit. When the switching circuit is turned on, the direct current output by the power supply end passes through the LED load, the conversion control circuit, and the driving control circuit in sequence.

[0008] The input end of the conversion control circuit is used to connect a first control signal, and the output end of the conversion control circuit is connected to the trigger end of the switching circuit. The conversion control circuit and the driving control circuit are connected to the same potential reference point. The conversion control circuit is used to control the turn-on or turn-off of the switching circuit when the first control signal is connected, so as to control the on-off of the LED load.

[0009] Further, the drive control circuit is used for connecting a second control signal, the second control signal is connected with the same potential reference point of the drive control circuit, and the drive control circuit is used for controlling the current of the LED load according to the accessed second control signal to adjust the brightness of the LED load.

[0010] Further, the drive control circuit comprises a constant current drive module, an energy storage sub-circuit, a freewheeling diode, a current sampling sub-circuit and a filter sub-circuit.

[0011] The drive input end of the constant current drive module is connected with one end of the energy storage sub-circuit and the anode of the freewheeling diode respectively, the drive output end of the constant current drive module is grounded, the other end of the energy storage sub-circuit is connected with the second end of the switch circuit and one end of the filter sub-circuit respectively, the cathode of the freewheeling diode is connected with the power supply end, the other end of the filter sub-circuit is connected with the power supply end, the current sampling end of the constant current drive module is grounded through the current sampling sub-circuit, and the power taking end of the constant current drive module is connected with the power supply end.

[0012] Further, the conversion control circuit comprises a first conversion control module and a second conversion control module, the first end of the first conversion control module and the trigger end and the first end of the second conversion control module are connected with direct current voltage respectively, the second end of the first conversion control module is grounded, and the trigger end of the first conversion control module is used for connecting a first control signal.

[0013] The switch circuit comprises a first switch module, the first end of the first switch module is used for connecting the cathode of the LED load, the second end of the first switch module is connected with the drive control circuit, and the trigger end of the first switch module is connected with the second end of the second conversion control module.

[0014] Further, the switch circuit further comprises a second switch module, the first end of the second switch module is used for connecting the cathode of the LED load, the second end of the second switch module is connected with the drive control circuit, the trigger end of the second switch module is connected with direct current voltage, and the LED load connected with the first switch module is connected in parallel with the LED load connected with the second switch module.

[0015] Further, when the first conversion control module accesses the first control signal, the first switch module is turned on, and the second switch module is turned off; or

[0016] When the first conversion control module accesses the first control signal, the first switch module is turned off, and the second switch module is turned on.

[0017] Further, when the first conversion control module accesses the first control signal, the first switch module and the second switch module are turned on at the same time; or

[0018] When the first conversion control module accesses the first control signal, the first switch module and the second switch module are turned off at the same time.

[0019] Further, the first conversion control module comprises a first switch, a first voltage division sub-circuit, a second voltage division sub-circuit and a first biasing sub-circuit; one end of the first voltage division sub-circuit is used for connecting a first control signal, the other end of the first voltage division sub-circuit is connected with a trigger end of the first switch and one end of the first biasing sub-circuit respectively, a first end of the first switch is connected with a direct current voltage through the second voltage division sub-circuit, and a second end of the first switch and the other end of the first biasing sub-circuit are grounded.

[0020] The second conversion control module comprises a third switch and a fourth voltage division sub-circuit; one end of the fourth voltage division sub-circuit is connected with a direct current voltage, and the other end of the fourth voltage division sub-circuit is connected with a trigger end of the third switch; a first end of the third switch is connected with a direct current voltage.

[0021] The first switch module comprises a second switch, a third voltage division sub-circuit and a second biasing sub-circuit; one end of the third voltage division sub-circuit is connected with a second end of the third switch, the other end of the third voltage division sub-circuit is connected with a trigger end of the second switch and one end of the second biasing sub-circuit respectively, a first end of the second switch is connected with a cathode for connecting an LED load, and a second end of the second switch and the other end of the second biasing sub-circuit are connected with a driving control circuit respectively.

[0022] The first switch is selected from an NPN type triode or an N type MOS tube, and the third switch is selected from a PNP type triode or a P type MOS tube; or the first switch is selected from a PNP type triode or a P type MOS tube, and the third switch is selected from an NPN type triode or an N type MOS tube.

[0023] Further, the second switch module comprises a fourth switch, a fifth voltage division sub-circuit, a voltage stabilizing sub-circuit and a second diode; one end of the fifth voltage division sub-circuit is connected with a direct current voltage, the other end of the fifth voltage division sub-circuit is connected with a trigger end of the fourth switch and one end of the voltage stabilizing sub-circuit respectively, a first end of the fourth switch is used for connecting a cathode of an LED load, a second end of the fourth switch and the other end of the voltage stabilizing sub-circuit are connected with a driving control circuit, a cathode of the second diode is connected with a first end of the second switch, and an anode of the second diode is connected with a trigger end of the fourth switch.

[0024] Further, the second switch module comprises a fourth switch, a fifth voltage division sub-circuit and a voltage stabilizing sub-circuit; one end of the fifth voltage division sub-circuit is connected with a direct current voltage, the other end of the fifth voltage division sub-circuit is connected with a trigger end of the fourth switch and one end of the voltage stabilizing sub-circuit respectively, a first end of the fourth switch is used for connecting a cathode of an LED load, and a second end of the fourth switch and the other end of the voltage stabilizing sub-circuit are connected with a driving control circuit.

[0025] In a second aspect, an LED lamp is provided, comprising the LED control circuit of the first aspect.

[0026] The beneficial effect of the present application is that the on-off state of the LED load is controlled by receiving the control signal through the conversion control circuit, the conversion control circuit and the driving control circuit on the direct current path of the LED load are connected to the same potential reference point, the control effect is realized even if the power supply of the LED load and the control signal of the LED load are not in the same reference plane, the control of the control signal on the LED load not sharing the same ground is realized, the power supply and the control state are stable, and there is no need to use coupling devices such as optical couplers, inductors or capacitors. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 FIG. 1 is a circuit structure diagram of an LED control circuit provided by an embodiment.

[0028] Figure 2 FIG. 2 is a circuit structure diagram of a driving control circuit provided by an embodiment.

[0029] Figure 3 FIG. 3 is a circuit structure diagram of a conversion control circuit and a switching circuit provided by a first embodiment.

[0030] Figure 4 FIG. 4 is a circuit structure diagram of a conversion control circuit and a switching circuit provided by a second embodiment.

[0031] Figure 5 FIG. 5 is a circuit structure diagram of a conversion control circuit and a switching circuit provided by a third embodiment. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the present application will be further described below with reference to the embodiments and the drawings.

[0033] In the description of the present application, the meaning of several is indefinite quantity, the meaning of multiple is two or more, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or implicitly indicating the sequence of indicated technical features. In addition, and / or appearing in the full text means three parallel schemes, for example, A and / or B means the scheme satisfied by A, the scheme satisfied by B or the scheme satisfied by A and B at the same time.

[0034] In the description of the present application, the term "comprise", "include" or any other variant thereof is intended to cover non-exclusive inclusion, in addition to including the listed elements, other elements not explicitly listed can also be included.

[0035] As described in the background, the power supply for the LED load and the control signal for the LED load in the LED driving power supply are not in the same reference level, if a communication path is to be established between them, voltage isolation is needed, usually, a coupling device such as an optical coupler, an inductor or a capacitor is used to establish a communication path to achieve the purpose of voltage isolation, so as to ensure that the power supply for the LED load and the control signal for the LED load are in the same reference level, and the power supply and the control state are stable, however, the use of the coupling device such as the optical coupler, the inductor or the capacitor will make the power supply structure complex and the volume greatly increased, and the material cost is expensive.

[0036] Based on this, the first aspect of the present application provides an LED control circuit for driving an LED load, which can achieve the control effect without using a coupling device such as an optical coupler, an inductor or a capacitor, so that the power supply for the LED load and the control signal for the LED load are not in the same reference level, and the power supply and the control state are stable and reliable.

[0037] Reference is made to Figure 1 , Figure 1 is a structural schematic diagram of the LED control circuit of the first embodiment. As shown in Figure 1 , the LED control circuit comprises a power supply end Vin, a driving control circuit 100, a conversion control circuit 200 and a switching circuit 300, and is used for driving an LED load.

[0038] In the LED control circuit, the power supply end Vin is connected to the driving control circuit 100 and an anode for connecting the LED load, and provides direct current power for the driving control circuit 100 and the LED load; a first end of the switching circuit 300 is used for connecting a cathode of the LED load, a second end of the switching circuit 300 is connected to the driving control circuit 100, when the switching circuit 300 is turned on, the power supply end Vin, the LED load, the conversion control circuit 200 and the driving control circuit 100 form a direct current path; an input end of the conversion control circuit 200 is used for connecting a first control signal PWM1, an output end of the conversion control circuit 200 is connected to a trigger end of the switching circuit 300, the conversion control circuit 200 and the driving control circuit 100 are respectively connected to the same potential reference point, the conversion control circuit 200 is used for controlling the turning on or turning off of the switching circuit 300 when the first control signal PWM1 is connected, so as to control the lighting or extinguishing of the LED load.

[0039] In the embodiment, the power supply terminal Vin outputs direct current power, and provides direct current power to the driving control circuit 100 and the LED load. The driving control circuit 100 is powered on and started. When the conversion control circuit 200 is connected to the first control signal PWM1, the conversion control circuit 200 controls the switch circuit 300 to be turned on, so that the power supply terminal Vin, the LED load, the conversion control circuit 200 and the driving control circuit 100 form a direct current path, and the LED load emits light. Since the driving control circuit 100 and the conversion control circuit 200 are respectively connected to the same potential reference point, more specifically, the driving control circuit 100 and the conversion control circuit 200 are respectively connected to the same reference ground, the first control signal PWM1 is input to the conversion control circuit 200 as a switching control signal. When the conversion control circuit 200 is connected to the first control signal PWM1 and controls the switch circuit 300 to be turned on, the power supply terminal Vin and the driving control circuit 100 form a voltage difference, and the LED load emits light, thereby realizing the control of the LED load which is not connected to the same ground by the actual ground control signal.

[0040] In one embodiment, as shown in Figure 2 the driving control circuit 100 is used to connect the second control signal PWM2. The second control signal PWM2 is connected to the same potential reference point as the driving control circuit 100. The driving control circuit 100 is used to control the current of the LED load according to the connected second control signal PWM2, so as to adjust the brightness of the LED load.

[0041] In the embodiment, the second control signal PWM2 is input to the driving control circuit 100 as a dimming control signal. By controlling the voltage difference between the driving control circuit 100 and the power supply terminal Vin, the brightness of the LED load is adjusted. For example, the second control signal PWM2 reduces the voltage difference between the driving control circuit 100 and the power supply terminal Vin, and the brightness of the LED load is reduced. The second control signal PWM2 increases the voltage difference between the driving control circuit 100 and the power supply terminal Vin, and the brightness of the LED load is increased.

[0042] As an optional implementation, as shown in Figure 2 the driving control circuit 100 includes a constant current driving module 110, an energy storage sub-circuit 120, a freewheeling diode D1, a current sampling sub-circuit 130 and a filter sub-circuit 140. Specifically, the driving input end of the constant current driving module 110 is connected to one end of the energy storage sub-circuit 120 and the anode of the freewheeling diode D1, respectively. The driving output end of the constant current driving module 110 is grounded. The other end of the energy storage sub-circuit 120 is connected to the second end of the switch circuit 300 and one end of the filter sub-circuit 140, respectively. The cathode of the freewheeling diode D1 is connected to the power supply terminal Vin. The other end of the filter sub-circuit 140 is connected to the power supply terminal Vin. The current sampling end of the constant current driving module 110 is grounded through the current sampling sub-circuit 130.

[0043] The constant current driving module 110 adjusts the voltage difference between the anode and the cathode of the LED load according to the second control signal PWM2 to control the brightness of the LED load. The constant current driving module 110 collects the voltage of the driving output end through the current sampling sub-circuit 130, calculates the current sampling signal through the collected voltage value and the internal resistance of the current sampling sub-circuit 130, and then controls the current of the LED load to realize constant current control.

[0044] More specifically, the constant current driving module 110 selects a constant current driving chip U1, the current sampling sub-circuit 130 includes a first sampling resistor RS1 and a second sampling resistor RS2, the first sampling resistor RS1 and the second sampling resistor RS2 are connected in parallel, the energy storage sub-circuit 120 includes a first inductor L1, the filter sub-circuit 140 includes a first electrolytic capacitor CE1, the anode of the first electrolytic capacitor CE1 is connected to the power supply end Vin, and the cathode of the first electrolytic capacitor CE1 is connected to the driving input end of the constant current driving module 110 through the first inductor L1.

[0045] In one embodiment, as shown in Figure 3 The conversion control circuit 200 includes a first conversion control module 210 and a second conversion control module 220, and the switching circuit 300 includes a first switching module 310. Specifically, the first end of the first conversion control module 210 and the trigger end and the first end of the second conversion control module 220 are connected to the direct current voltage LED+, the second end of the first conversion control module 210 is grounded, the trigger end of the first conversion control module 210 is used to connect the first control signal PWM1, the first end of the first switching module 310 is used to connect the cathode of the LED load, the second end of the first switching module 310 is connected to the driving control circuit 100, and the trigger end of the first switching module 310 is connected to the second end of the second conversion control module 220.

[0046] The conversion control circuit 200 realizes the control of the non-common-ground LED load by the actual control signal. Specifically, the first conversion control module 210 and the second conversion control module 220 control the flow direction of the direct current voltage LED+. When the first control signal PWM1 triggers the first conversion control module 210 to conduct, the direct current voltage LED+ flows to the reference ground through the first conversion control module 210, which lowers the voltage of the trigger end of the second conversion control module 220, so that the second conversion control module 220 conducts, the direct current voltage LED+ flows to the trigger end of the first switching module 310, which triggers the first switching module 310 to conduct, the voltage difference formed across the LED load conducts the LED load, and the LED load emits light.

[0047] Furthermore, the first conversion control module 210 includes a first switch Q1, a first voltage divider circuit 211, a second voltage divider circuit 212, and a first bias sub-circuit 213. One end of the first voltage divider circuit 211 is connected to the first control signal PWM1, and the other end of the first voltage divider circuit 211 is connected to the trigger terminal of the first switch Q1 and one end of the first bias sub-circuit 213, respectively. The first end of the first switch Q1 is connected to the DC voltage LED+ through the second voltage divider circuit 212, and the second end of the first switch Q1 and the other end of the first bias sub-circuit 213 are grounded. The second conversion control module 220 includes a third switch Q3 and a fourth voltage divider circuit 221. One end of the fourth voltage divider circuit 221 is connected to the DC voltage LED+, and the other end of the fourth voltage divider circuit 221 is connected to the trigger terminal of the third switch Q3. The first end of the third switch Q3 is connected to the DC voltage LED+. The first switch module 310 includes a second switch Q2, a third voltage divider circuit 311, and a second bias sub-circuit 312. One end of the third voltage divider circuit 311 is connected to the second terminal of the third switch Q3, and the other end of the third voltage divider circuit 311 is connected to the trigger terminal of the second switch Q2 and one end of the second bias sub-circuit 312, respectively. The first terminal of the second switch Q2 is connected to the cathode for connecting the LED load, and the second terminal of the second switch Q2 and the other end of the second bias sub-circuit 312 are respectively connected to the drive control circuit 100. The first switch Q1 is selected as an NPN transistor or an N-type MOSFET, and the third switch Q3 is selected as a PNP transistor or a P-type MOSFET; or the first switch Q1 is selected as a PNP transistor or a P-type MOSFET, and the third switch Q3 is selected as an NPN transistor or an N-type MOSFET.

[0048] In one embodiment, such as Figure 4 As shown, in Figure 3 Based on the embodiment, the switching circuit 300 further includes a second switching module 320, which controls at least two sets of LED loads respectively through the first switching module 310 and the second switching module 320. Specifically, the first terminal of the second switching module 320 is used to connect to the cathode of the LED load, the second terminal of the second switching module 320 is connected to the drive control circuit 100, the trigger terminal of the second switching module 320 is connected to the DC voltage LED+, and the LED loads connected to the first switching module 310 and the LED loads connected to the second switching module 320 are connected in parallel.

[0049] In the embodiment, when the first conversion control module 210 is connected with the first control signal PWM1, the first conversion control module 210 and the second conversion control module 220 are turned on at the same time to make the first switch module 310 turn off and the second switch module 320 turn on; or when the first conversion control module 210 is connected with the first control signal PWM1, the first conversion control module 210 and the second conversion control module 220 are turned off at the same time to make the first switch module 310 turn on and the second switch module 320 turn off. When the first control signal PWM1 triggers the first conversion control module 210 to turn on, the second conversion control module 220 is also turned on at the same time, the direct current voltage LED+ flows to the reference ground through the first conversion control module 210 and flows to the trigger end of the first switch module 310 through the second conversion control module 220, so that the first switch module 310 is turned on, the trigger end level of the second switch module 320 is pulled down, the second switch module 320 is turned off, the LED load connected with the first switch module 310 emits light, and the LED load connected with the second switch module 320 does not emit light; when the first control signal PWM1 triggers the first conversion control module 210 to turn off, the second conversion control module 220 is also turned off at the same time, the direct current voltage LED+ flows to the trigger end of the first switch module 310, so that the first switch module 310 is turned off and the second switch module 320 is turned on, the LED load connected with the first switch module 310 does not emit light, and the LED load connected with the second switch module 320 emits light.

[0050] Further, the second switch module 320 includes a fourth switch Q4, a fifth voltage division sub-circuit 321, a voltage stabilization sub-circuit 322 and a second diode D2. Specifically, one end of the fifth voltage division sub-circuit 321 is connected with the direct current voltage, the other end of the fifth voltage division sub-circuit 321 is connected with the trigger end of the fourth switch Q4 and the cathode of the voltage stabilization sub-circuit 322 respectively, the first end of the fourth switch Q4 is used for connecting with the cathode of the LED load, the second end of the fourth switch Q4 and the anode of the voltage stabilization sub-circuit 322 are connected with the driving control circuit, the cathode of the second diode D2 is connected with the first end of the second switch Q2, and the anode of the second diode D2 is connected with the trigger end of the fourth switch Q4. When the second switch Q2 is turned on, the trigger end level of the fourth switch Q4 is pulled down through the second diode D2, so that the fourth switch Q4 is turned off. In the embodiment, the voltage stabilization sub-circuit 322 adopts a voltage stabilization diode ZD1, the cathode of the voltage stabilization diode ZD1 is connected with the trigger end of the fourth switch Q4, and the anode of the voltage stabilization diode ZD1 is connected with the second end of the fourth switch Q4. In some other embodiments, the voltage stabilization diode ZD1 can also be selected as a resistor.

[0051] In one of the embodiments, as shown in FIG. 3, the switch circuit 300 includes the first switch module 310 and the second switch module 320, and at least two groups of LED loads are controlled through the first switch module 310 and the second switch module 320 respectively, which is different from the prior art. Figure 5 In one of the embodiments, as shown in FIG. 3, the switch circuit 300 includes the first switch module 310 and the second switch module 320, and at least two groups of LED loads are controlled through the first switch module 310 and the second switch module 320 respectively, which is different from the prior art.Figure 4 The difference of the embodiment is that the first switch module 310 and the second switch module 320 are simultaneously turned on when the first conversion control module 210 is connected with the first control signal PWM1, or the first switch module 310 and the second switch module 320 are simultaneously turned off when the first conversion control module 210 is connected with the first control signal PWM1.

[0052] Specifically, the second switch module 320 comprises a fourth switch Q4, a fifth voltage division sub-circuit 321 and a voltage stabilizing sub-circuit 322. One end of the fifth voltage division sub-circuit 321 is connected with the direct current voltage LED+, and the other end of the fifth voltage division sub-circuit 321 is respectively connected with the trigger end of the fourth switch Q4 and one end of the voltage stabilizing sub-circuit 322. The first end of the fourth switch Q4 is used for connecting the cathode of the LED load, and the second end of the fourth switch Q4 and the other end of the voltage stabilizing sub-circuit 322 are connected with the driving control circuit 100. In the embodiment, when the first control signal PWM1 triggers the first conversion control module 210 to be turned on, the second conversion control module 220 is also simultaneously turned on, the direct current voltage LED+ flows to the reference ground through the first conversion control module 210 and flows to the trigger end of the first switch module 310 and the trigger end of the second switch module 320 through the second conversion control module 220 respectively, the first switch module 310 and the second switch module 320 are simultaneously turned on, and the LED load connected with the first switch module 310 and the second switch module 320 is simultaneously lighted; on the contrary, the first switch module 310 and the second switch module 320 are simultaneously turned off, and the LED load connected with the first switch module 310 and the second switch module 320 is simultaneously extinguished.

[0053] In some other embodiments, when the first conversion control module 210 is connected to the first control signal PWM1, the first conversion control module 210 is turned on, and the second conversion control module 220 is turned off, so that the first switch module 310 and the second switch module 320 are turned off at the same time; or when the first conversion control module 210 is connected to the first control signal PWM1, the first conversion control module 210 is turned off, and the second conversion control module 220 is turned on, so that the first switch module 310 and the second switch module 320 are turned on at the same time. When the first control signal PWM1 triggers the first conversion control module 210 to be turned on and the second conversion control module 220 to be turned off, the direct current voltage LED+ flows through the first conversion control module 210 to the reference ground, so that the first switch module 310 and the second switch module 320 are turned off at the same time, and the LED load connected to the first switch module 310 and the second switch module 320 does not emit light; when the first control signal PWM1 triggers the first conversion control module 210 to be turned off and the second conversion control module 220 to be turned on, the direct current voltage LED+ flows to the trigger end of the first switch module 310 and the trigger end of the second switch module 320 through the second conversion control module 220, so that the first switch module 310 is turned on and the second switch module 320 is turned on at the same time, and the LED load connected to the first switch module 310 and the second switch module 320 emits light.

[0054] The first voltage division sub-circuit 211, the second voltage division sub-circuit 212, the third voltage division sub-circuit 311, the fourth voltage division sub-circuit 221 and the fifth voltage division sub-circuit 321 mentioned in the above embodiments are formed by one or more resistors in series.

[0055] The LED control circuit of the embodiment of the application controls the conduction state of the LED load by receiving the control signal through the conversion control circuit 200, the conversion control circuit 200 and the driving control circuit 100 on the direct current path of the LED load are connected to the same potential reference point, the control signal is actually controlled to control the LED load not sharing the same ground, so that the power supply of the LED load and the control signal of the LED load are not in the same reference ground plane, and the control effect can be achieved, the power supply and the control state are stable, and no coupling devices such as optocouplers, inductors or capacitors are needed.

[0056] According to the second aspect of the application, an LED lamp is provided, which comprises the above-mentioned LED control circuit, and the specific structure of the LED control circuit is referred to the above-mentioned embodiments. Since the LED lamp adopts all the technical solutions of the above-mentioned embodiments, it at least has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0057] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of the changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An LED control circuit for driving an LED load, characterized by, The power supply end, the drive control circuit, the conversion control circuit and the switch circuit are included; The power supply end is connected with the drive control circuit and the anode of the LED load, and direct current power is provided for the drive control circuit and the LED load; The first end of the switch circuit is used for connecting the cathode of the LED load, the second end of the switch circuit is connected with the drive control circuit, and when the switch circuit is turned on, the direct current output by the power supply end passes through the LED load, the conversion control circuit and the drive control circuit in sequence; The input end of the conversion control circuit is used for connecting the first control signal, the output end of the conversion control circuit is connected with the trigger end of the switch circuit, the conversion control circuit and the drive control circuit are connected with the same potential reference point respectively, and the conversion control circuit is used for controlling the turn-on or turn-off of the switch circuit when the first control signal is connected, so as to control the on-off of the LED load; The conversion control circuit includes a first conversion control module and a second conversion control module, the first end of the first conversion control module and the trigger end and the first end of the second conversion control module are connected with direct current voltage respectively, the second end of the first conversion control module is grounded, and the trigger end of the first conversion control module is used for connecting the first control signal; The switch circuit includes a first switch module, the first end of the first switch module is used for connecting the cathode of the LED load, the second end of the first switch module is connected with the drive control circuit, and the trigger end of the first switch module is connected with the second end of the second conversion control module; The first conversion control module includes a first switch, a first voltage division sub-circuit, a second voltage division sub-circuit and a first biasing sub-circuit, one end of the first voltage division sub-circuit is used for connecting the first control signal, the other end of the first voltage division sub-circuit is connected with the trigger end of the first switch and one end of the first biasing sub-circuit respectively, the first end of the first switch is connected with the direct current voltage through the second voltage division sub-circuit, and the second end of the first switch and the other end of the first biasing sub-circuit are grounded; The second conversion control module includes a third switch and a fourth voltage division sub-circuit, one end of the fourth voltage division sub-circuit is connected with the direct current voltage, the other end of the fourth voltage division sub-circuit is connected with the trigger end of the third switch, and the first end of the third switch is connected with the direct current voltage; The first switch module includes a second switch, a third voltage division sub-circuit and a second biasing sub-circuit, one end of the third voltage division sub-circuit is connected with the second end of the third switch, the other end of the third voltage division sub-circuit is connected with the trigger end of the second switch and one end of the second biasing sub-circuit respectively, the first end of the second switch is connected with the cathode of the LED load, and the second end of the second switch and the other end of the second biasing sub-circuit are connected with the drive control circuit respectively.

2. The LED control circuit of claim 1, wherein, The drive control circuit is used for connecting the second control signal, the second control signal and the drive control circuit are connected with the same potential reference point, and the drive control circuit is used for controlling the current of the LED load according to the connected second control signal, so as to adjust the brightness of the LED load.

3. The LED control circuit of claim 1 or 2, wherein, The drive control circuit comprises a constant current drive module, an energy storage sub-circuit, a freewheeling diode, a current sampling sub-circuit and a filter sub-circuit. The drive input end of the constant current drive module is connected with one end of the energy storage sub-circuit and the anode of the freewheeling diode respectively, the drive output end of the constant current drive module is grounded, the other end of the energy storage sub-circuit is connected with the second end of the switching circuit and one end of the filter sub-circuit respectively, the cathode of the freewheeling diode is connected with the power supply end, the other end of the filter sub-circuit is connected with the power supply end, the current sampling end of the constant current drive module is grounded through the current sampling sub-circuit, and the power taking end of the constant current drive module is connected with the power supply end.

4. The LED control circuit according to claim 1, wherein The switching circuit further comprises a second switching module, the first end of the second switching module is used for connecting the cathode of the LED load, the second end of the second switching module is connected with the drive control circuit, the trigger end of the second switching module is connected with the direct current voltage, and the LED load connected with the first switching module is connected in parallel with the LED load connected with the second switching module.

5. The LED control circuit according to claim 4, wherein When the first switching module is connected with the first control signal, the first switching module is turned on and the second switching module is turned off; or When the first switching module is connected with the first control signal, the first switching module is turned off and the second switching module is turned on.

6. The LED control circuit according to claim 4, wherein When the first switching module is connected with the first control signal, the first switching module and the second switching module are turned on at the same time; or When the first switching module is connected with the first control signal, the first switching module and the second switching module are turned off at the same time.

7. The LED control circuit according to claim 4 or 5, wherein The second switching module comprises a fourth switch, a fifth voltage dividing sub-circuit, a voltage stabilizing sub-circuit and a second diode, one end of the fifth voltage dividing sub-circuit is connected with the direct current voltage, the other end of the fifth voltage dividing sub-circuit is connected with the trigger end of the fourth switch and one end of the voltage stabilizing sub-circuit respectively, the first end of the fourth switch is used for connecting the cathode of the LED load, the second end of the fourth switch and the other end of the voltage stabilizing sub-circuit are connected with the drive control circuit, the cathode of the second diode is connected with the first end of the second switch, and the anode of the second diode is connected with the trigger end of the fourth switch.

8. The LED control circuit according to claim 6, wherein The second switching module comprises a fourth switch, a fifth voltage dividing sub-circuit and a voltage stabilizing sub-circuit, one end of the fifth voltage dividing sub-circuit is connected with the direct current voltage, the other end of the fifth voltage dividing sub-circuit is connected with the trigger end of the fourth switch and one end of the voltage stabilizing sub-circuit respectively, the first end of the fourth switch is used for connecting the cathode of the LED load, and the second end of the fourth switch and the other end of the voltage stabilizing sub-circuit are connected with the drive control circuit.

9. An LED lamp, characterized by The LED control circuit comprises the LED control circuit according to any one of claims 1 to 8.

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