Chip integrated module, control circuit and lighting device

Abstract

The present invention discloses a chip integrated module, a control circuit and a lighting device. In the chip integrated module, since the first grounding pin is connected to the public reference end of the rectifier unit in the chip integrated module and is not connected to other terminals of the chip integrated module, and the first voltage output pin is connected to the rectifier output end of the rectifier unit in the chip integrated module and is not connected to other terminals of the chip integrated module, the inductor arranged outside the chip integrated module and used for filtering the electrical signal in the control circuit can be connected to the low potential side where the first grounding pin is located, or can be connected to the high potential side where the first voltage output pin is located, and the user can flexibly set the inductance position of the filter according to actual needs, thereby improving the compatibility of the chip integrated module.

Description

Technical Field

[0001] The present application relates to the field of chip integration technology, and in particular to a chip integration module, a control circuit and a lighting device. Background Art

[0002] In the application of lighting products, the peripheral circuits including the chip integrated module and the external chip integrated module in the control circuit of the lighting product are used to control the light-emitting unit of the lighting device.

[0003] In order to improve the integration of the chip integrated module, the rectifier unit can be integrated and packaged into the chip integrated module, and the common reference end of the rectifier unit shares pins with other devices in the chip integrated module, or the rectifier output end of the rectifier unit shares pins with other devices in the chip integrated module. However, the arrangement positions of various components in the corresponding peripheral circuits of such a chip integrated module are usually fixed, resulting in the inability to meet the compatibility requirements in actual applications. Summary of the invention

[0004] The present invention discloses a chip integrated module to meet the compatibility requirements in practical applications. In addition, the present invention also provides a control circuit and a lighting device.

[0005] In order to solve the above problems, the present invention adopts the following technical solutions:

[0006] In a first aspect, the present invention provides a chip integrated module for an inductor of an external filter, the chip integrated module comprising: an AC input pin, a first ground pin, a first voltage output pin, and a rectifier unit, wherein the rectifier unit has a rectifier input terminal, a rectifier output terminal and a public reference terminal, the rectifier input terminal is connected to the AC input pin, the first ground pin is independently connected to the public reference terminal, and the first voltage output pin is independently connected to the rectifier output terminal; at least one of the first ground pin and the first voltage output pin is used for the inductor of the external filter.

[0007] The above-mentioned chip integrated module also includes: a current signal sampling pin, a second ground pin and a control pin; the current signal sampling pin is used to externally connect a sampling resistor to sample the current value in the control circuit; inside the chip integrated module, the second ground pin is independent of the first ground pin; the control pin is used to connect an external resistor, and the chip integrated module determines the over-temperature protection threshold value according to the resistance value of the external resistor.

[0008] The above-mentioned chip integrated module is characterized in that the chip integrated module also includes a switch tube and a logic control unit, the switch tube includes a source, a drain and a control electrode, the logic control unit has a current sampling end and a driving end, the source is connected to the current signal sampling pin and the current sampling end, and the driving end is connected to the control electrode to control the switch tube to be turned off or turned on.

[0009] The above-mentioned chip integrated module is characterized in that the chip integrated module also includes a first freewheeling diode, a second voltage output pin and a drain pin, the positive electrode of the first freewheeling diode is connected to the drain and the drain pin, and the negative electrode of the first freewheeling diode is connected to the second voltage output pin.

[0010] In a second aspect, the present invention provides a control circuit, comprising a filter, an external ground terminal and a chip integrated module as described in any one of the above items, wherein the filter comprises a filter inductor, and the filter inductor comprises a first terminal and a second terminal;

[0011] The first end is connected to the first voltage output pin, and the second end is used to connect to a load; or

[0012] The first end is connected to the first ground pin, the second end is connected to the second ground pin of the chip integrated module, and the second ground pin is connected to the external ground end.

[0013] In the above-mentioned control circuit, when the first end is connected to the first voltage output pin and the second end is used to connect to a load, the filter also includes a first filter capacitor and a second filter capacitor; the negative electrodes of the first filter capacitor and the second filter capacitor are both connected to the first ground pin, the positive electrode of the first filter capacitor is connected to the first end, and the positive electrode of the second filter capacitor is connected to the second end.

[0014] In the above-mentioned control circuit, when the first end is connected to the first ground pin and the second end is connected to the second ground pin of the chip integrated module, the filter also includes a first filter capacitor and a second filter capacitor; the negative electrodes of the first filter capacitor and the second filter capacitor are respectively connected to the first end and the second end, and the positive electrodes of the first filter capacitor and the second filter capacitor are both used to connect to the load.

[0015] The control circuit mentioned above, the chip integrated module further comprises: a drain pin;

[0016] The control circuit further includes a chopper, and two ends of the chopper are respectively connected to the drain pin and the load.

[0017] The above-mentioned control circuit, the chip integrated module also includes a current signal sampling pin, the control circuit includes a sampling resistor, and the sampling resistor is connected between the current signal sampling pin and the external ground terminal.

[0018] In the above-mentioned control circuit, the chip integrated module also includes a control pin; the control circuit includes an external resistor, and the external resistor is connected between the control pin and the external ground terminal; the chip integrated module determines the over-temperature protection threshold and the slope of the temperature-current curve according to the resistance value of the external resistor.

[0019] In a third aspect, the present invention provides a lighting device, comprising a light-emitting unit, and a control circuit as described in any one of the above items, wherein the control circuit is used to input direct current to the light-emitting unit.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The chip integrated module disclosed in the present invention includes: an AC input pin, a first ground pin, a first voltage output pin, and a rectifier unit. The rectifier unit has a rectifier input terminal, a rectifier output terminal and a public reference terminal. The rectifier input terminal is connected to the AC input pin, the first ground pin is independently connected to the public reference terminal, and the first voltage output pin is independently connected to the rectifier output terminal; at least one of the first ground pin and the first voltage output pin is used for the inductance of the external filter. Since the first ground pin is connected to the public reference terminal of the rectifier unit in the chip integrated module and is not connected to other terminals of the chip integrated module, and the first voltage output pin is connected to the rectifier output terminal of the rectifier unit in the chip integrated module and is not connected to other terminals of the chip integrated module, the inductance set outside the chip integrated module for filtering the electrical signal in the control circuit can be connected to the low potential side where the first ground pin is located, or can be connected to the high potential side where the first voltage output pin is located. The user can flexibly set the inductance position of the filter according to actual needs to improve the compatibility of the chip integrated module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0023] Figure 1 A schematic diagram of the structure of a chip integrated module provided in the first embodiment of the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of a logic control unit of a chip integrated module;

[0025] Figure 3 A schematic diagram of the structure of a control circuit provided in Embodiment 2 of the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of another control circuit provided in the second embodiment of the present invention.

[0027] Figure 5 A schematic diagram of the structure of a control circuit provided in Embodiment 3 of the present invention.

[0028] Reference numerals:

[0029] 100-chip integrated module; 10-logic control unit; 11-temperature detection subunit; 111-output end of temperature detection subunit; 12-control subunit; 121-temperature input end; 122-logic output end; 13-drive subunit; 131-input end of drive subunit; 14-logic ground end; 15-current sampling end; 16-drive end; 17-threshold adjustment end; 200 / 200'-control circuit; 210-filter; 220-chopper; 230-AC module; 240-load;

[0030] ACIN-AC input pin; ACIN1-AC first input pin; ACIN2-AC second input pin;

[0031] GND1-first ground pin; GND2-second ground pin; GND3-external ground terminal;

[0032] D1-rectifier unit; D1IN-rectifier input terminal; D1IN1-rectifier first input terminal; D1IN2-rectifier second input terminal; D1OUT-rectifier output terminal; D1CG-common reference terminal; D2-first freewheeling diode; D3-second freewheeling diode;

[0033] EC1 / EC1'-first filter capacitor; EC2 / EC2'-second filter capacitor; EC3-third capacitor;

[0034] L1 / L1'-filter inductor; L2-chopper inductor;

[0035] Vin1-first voltage output pin; Vin2 / NC-second voltage output pin;

[0036] ISEN-current signal sampling pin;

[0037] Q-switch tube; QS-source; QD-drain; QG-control electrode;

[0038] TH / SLP-control foot;

[0039] Rth / Rslp-external resistor; RL-parallel resistor; Rcs-sampling resistor;

[0040] LED-light-emitting unit;

[0041] Drain-drain pin;

[0042] AC-AC source; Fuse-fuse. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in combination with the specific embodiments of the present application and the corresponding drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present application.

[0044] In the embodiment of the present invention, the chip integrated module may be an AC-DC integrated module, or other chip integrated modules that require additional filters, which will not be described in detail herein. The electromagnetic compatibility may be EMI (ElectroMagneticInterference) electromagnetic compatibility requirements, or other electromagnetic compatibility requirements.

[0045] Embodiment 1

[0046] like Figure 1 As shown, an embodiment of the present invention provides a chip integrated module 100 for an inductor of an external filter, and the chip integrated module includes: an AC input pin ACIN, a first ground pin GND1, a first voltage output pin Vin1, and a rectifier unit D1, wherein the rectifier unit D1 has a rectifier input terminal D1IN, a rectifier output terminal D1OUT, and a common reference terminal D1CG. The AC input pin ACIN is connected to the rectifier input terminal D1IN, and the number of pins of the AC input pin ACIN is two, including an AC first input pin ACIN1 and an AC second input pin ACIN2; the number of rectifier input terminals D1IN is two, including a rectifier first input terminal D1IN1 and a rectifier second input terminal D1IN2. The two AC input pins ACIN are respectively connected to the two rectifier input terminals D1IN, specifically, the AC first input pin ACIN1 is connected to the rectifier first input pin D1IN1, and the AC second input pin ACIN2 is connected to the rectifier second input pin D1IN2. The first ground pin GDN1 is independently connected to the common reference terminal D1CG, and the first voltage output pin Vin1 is independently connected to the rectifier output terminal D1OUT. At least one of the first ground pin GDN1 and the first voltage output pin Vin1 is used for an inductor of an external filter.

[0047] In the embodiment of the present invention, independent connection means that the pin is independently connected to a certain end in the chip integrated module, that is, the pin is specially set for a certain end in the chip integrated module.

[0048] In the embodiment of the present invention, since the first ground pin GND1 is connected to the public reference terminal D1CG of the rectifier unit D1 in the chip integrated module 100 and is not connected to other terminals of the chip integrated module 100, and the first voltage output pin Vin1 is connected to the rectifier output terminal D1OUT of the rectifier unit D1 in the chip integrated module and is not connected to other terminals of the chip integrated module 100, the inductor disposed outside the chip integrated module 100 for filtering the electrical signal in the control circuit 200 can be connected to the low potential side where the first ground pin GND1 is located, or can be connected to the high potential side where the first voltage output pin Vin1 is located, and the user can flexibly set the inductance position of the filter 210 according to actual needs to improve the compatibility of the chip integrated module. The rectifier unit D1 can be a common rectifier device such as a rectifier bridge.

[0049] The chip integrated module 100 further includes: a first freewheeling diode D2, a second voltage output pin Vin2 / NC and a drain pin Drain. The cathode of the first freewheeling diode D2 is connected to the second voltage output pin Vin2 / NC, and the anode of the first freewheeling diode D2 is connected to the drain pin Drain. The second voltage output pin Vin2 / NC is an independent pin, and is not connected to other terminals in the chip integrated module except the cathode of the first freewheeling electrode D2, and can be left empty when the drain pin Drain is externally connected to the second freewheeling diode D3. Specifically, when the second voltage output pin Vin2 / NC is unconnected, the first freewheeling diode D2 does not form a loop with the peripheral circuit of the chip integrated module 100, that is, the first freewheeling diode D2 is not connected to the control circuit 200, and the drain pin Drain is externally connected to the second freewheeling diode D3. The second freewheeling diode D3 can replace the first freewheeling diode D1 to achieve the freewheeling function. Therefore, when the first freewheeling diode D2 in the chip integrated module 100 does not meet the requirements of the control circuit 200, the external second freewheeling diode D3 can be flexibly selected to improve the compatibility of the chip integrated module 100 and meet the optimization requirements of the control circuit 200.

[0050] Among them, the rated current of the second freewheeling diode D3 can be greater than the rated current of the first freewheeling diode D2. When the rated current of the first freewheeling diode D2 in the chip integrated module 100 cannot meet the larger output current demand, the second voltage output pin Vin2 / NC is left empty, and the drain pin Drain is externally connected to the second freewheeling diode D3 with a larger rated current, so that the larger output current demand can be met in the control circuit, and the optimization requirements in practical applications are realized. Of course, in some special implementations, the rated current of the second freewheeling diode D3 can be less than or equal to the rated current of the first freewheeling diode D2. In addition to the rated current, other electrical parameters of the second freewheeling diode D3 can also be greater than, less than or equal to the parameters of the first freewheeling diode D3; electrical parameters include withstand voltage value, power value, etc.

[0051] The chip integrated module 100 further includes a current signal sampling pin ISEN, which is used to connect an external sampling resistor Rcs to sample the current value in the control circuit. The chip integrated module 100 further includes a second ground pin GND2, which is independent of the first ground pin GND1.

[0052] The chip integrated module 100 also includes a control pin TH / SLP, which is used to connect an external resistor Rth / Rslp. The chip integrated module 100 determines the over-temperature protection threshold and the slope of the temperature-current curve according to the resistance value of the external resistor Rth / Rslp.

[0053] In summary, the chip integrated module 100 of the embodiment of the present invention has 9 pins, specifically including: an AC first input pin ACIN1, an AC second input pin ACIN2, a first ground pin GND1, a second ground pin GND2, a first voltage output pin Vin1, a second voltage output pin VIN2, a current sampling pin ISEN, a control pin TH / SLP, and a drain pin Drain.

[0054] Specifically, the chip integration module also includes a logic control unit 10 and a switch tube Q.

[0055] The logic control unit 10 has a logic ground terminal 14 , and the second ground pin GND2 is connected to the logic ground terminal 14 of the logic control unit 10 .

[0056] In addition to the above-mentioned logic ground terminal 14, the logic control unit 10 also has a current sampling terminal 15, a driving terminal 16 and a threshold adjustment terminal 17. The current sampling terminal 15 is connected to the current signal sampling pin ISEN for inputting the collected current signal. The driving terminal 16 is used to output the driving instruction. The threshold adjustment terminal 17 is connected to the control pin TH / SLP of the chip integrated module. The chip integrated module 100 determines the over-temperature protection threshold or the temperature-current curve slope of the chip integrated module according to the resistance value of the external resistor based on a preset mapping relationship.

[0057] The switch tube Q includes a source QS, a drain QD and a control electrode QG. The source QS is connected to the current signal sampling pin ISEN and the current sampling terminal 15 of the logic control unit 10, that is, the current signal sampling pin ISEN of the chip integrated module 100 is connected to the current sampling terminal 15 of the logic control unit 10. The driving end 16 of the logic control unit 10 is connected to the control electrode QG of the switch tube Q. Combined with the sampled current signal, based on the current target of reducing or increasing the current, a driving signal is output to the control electrode QG of the switch tube Q to control the switch tube Q to be turned off or turned on, thereby achieving the purpose of adjusting the voltage or current. Among them, the drain QD is connected to the drain pin Drain, that is, the drain QD is connected to the positive electrode of the first freewheeling diode. The switch tube is a common triode or MOS tube.

[0058] Specifically, Figure 2 As shown, the logic control unit 10 may include a temperature detection subunit 11, a control subunit 12 and a driving subunit 13. The temperature detection subunit 11 includes a detection component and an output terminal 111, the detection component is used to detect the current temperature of the chip integrated module 100, and the output terminal 111 of the temperature detection subunit sends a logic signal to the control subunit 12 according to the detected current temperature. The control subunit 12 includes a temperature input terminal 121, a current sampling terminal 15 and a logic output terminal 122, the temperature input terminal 121 is connected to the output terminal 111 of the temperature detection subunit 11, and is used to receive the logic signal sent by the temperature detection subunit 11, and the current sampling terminal 15 is connected to the current signal sampling pin ISEN. The driver unit 13 includes an input terminal 131 and an output terminal 16. The input terminal 131 of the driver unit 13 is connected to the logic output terminal 122 of the control unit 12 to receive the driving signal output by the control unit 12. The output terminal of the driver unit 13 is connected to the control electrode QG of the switch tube Q, and is used to output a driving instruction to the control electrode QG of the switch tube Q according to the received driving signal, and the switch tube Q is turned on or off according to the driving instruction. Obviously, the output terminal of the above-mentioned driver unit 13 is the driving terminal 16 of the logic control unit 10.

[0059] The chip integrated module 100 of the embodiment of the present invention can utilize a control pin TH / SLP to connect an external resistor Rth / Rslp, and the logic control unit 10 determines the over-temperature protection threshold and the temperature-current curve slope of the chip integrated module 100 according to the resistance value of the external resistor Rth / Rslp, that is, only one control pin TH / SLP can be set to realize two functions.

[0060] Among them, the above-mentioned preset mapping relationship includes: based on the mapping relationship between the first resistance value interval and the over-temperature protection value, according to the resistance value of the external resistor Rth / Rslp, determining the over-temperature protection threshold of the chip integrated module 100. The above-mentioned preset mapping relationship also includes: based on the mapping relationship between the second resistance value interval and the slope of the temperature-current curve, according to the resistance value of the external resistor Rth / Rslp, determining the over-temperature protection threshold of the chip integrated module 100.

[0061] The above preset relationship can be pre-set in the logic control unit 10. For example, when the resistance value of the external resistor Rth / Rslp is between 100-200 ohms, the over-temperature protection threshold is A, and when the resistance value of the external resistor Rth / Rslp is between 200-300 ohms, the over-temperature protection threshold is B. If the current resistance value of the external resistor Rth / Rslp is 150 ohms, the over-temperature protection threshold is A, and the slope of the temperature-current curve is K1; if the current resistance value of the external resistor Rth / Rslp is adjusted to 180 ohms, the over-temperature protection threshold is still A, but the slope of the temperature-current curve is K2. Obviously, the external resistor Rth / Rslp is a resistor with adjustable resistance, which can be adjusted according to the actual needs of the chip integrated module 100.

[0062] For example, the temperature detection subunit 11 detects the current temperature of the chip integrated module 100, and sends a corresponding logic signal to the control subunit 12 based on the current temperature. The control subunit 12 obtains the corresponding over-temperature protection threshold value based on the resistance value of the external resistor Rth / Rslp, and determines whether the current temperature exceeds the over-temperature protection threshold value based on the logic signal. If it exceeds, the temperature needs to be lowered. The control subunit 12 obtains the slope of the temperature-current curve of the chip integrated module 100 based on the resistance value of the external resistor Rth / Rslp, and determines how much current value needs to be adjusted based on the temperature value to be lowered or the target temperature value and the current current obtained by sampling, thereby calculating the corresponding drive signal and sending it to the drive subunit 13. The drive subunit 13 generates a drive instruction to drive the switch tube Q to turn on or off based on the drive signal, thereby completing the current regulation.

[0063] Embodiment 2

[0064] The embodiment of the present invention provides a control circuit 200, such as Figure 3As shown, the control circuit 200 includes a filter 210, an external ground terminal GND3, and a chip integrated module 100 of the first embodiment. The filter 210 includes a filter inductor L1, and the filter inductor L1 includes a first end and a second end, the first end is connected to the first voltage output pin Vin1 of the chip integrated module 100, and the second end is connected to the load 240. In the embodiment of the present invention, the filter inductor L1 in the filter 210 is placed on the high potential side of the control circuit 200. The filter inductor L1 can be a differential mode inductor.

[0065] like Figure 3 As shown, the filter 210 can be an EMI filter, specifically a π-type EMI filter. When the filter 210 is a π-type EMI filter, the filter 210 further includes a first filter capacitor EC1 and a second filter capacitor EC2, and the negative electrodes of the first filter capacitor EC1 and the second filter capacitor EC2 are both connected to the first ground pin GND1 of the chip integrated module 100, the positive electrode of the first filter capacitor EC1 is connected to the first end, and the positive electrode of the second filter capacitor EC2 is connected to the second end.

[0066] Combination Figure 1 and Figure 3 When the second voltage output pin Vin2 / NC of the chip integrated module 100 is in a non-empty state, the second voltage output pin Vin2 / NC is connected to the second end of the filter inductor L1, that is, connected to the positive electrode of the load 240. At this time, the first freewheeling diode D2 in the chip integrated module 100 is connected to the control circuit 200 to form a loop to complete the freewheeling. There is no need to set a second freewheeling diode D3 on the control circuit 200.

[0067] Combination Figure 1 and Figure 4 When the first freewheeling diode D2 in the chip integrated module 100 cannot meet the requirements of the control circuit 200 (such as a larger output current requirement), the second voltage output pin Vin2 / NC can be left empty, and the drain pin Drain is connected to a second freewheeling diode D3 with a larger rated current. The rated current of the second freewheeling diode D3 can be flexibly set according to the requirements to achieve the optimization requirements in practical applications. The positive electrode of the second freewheeling diode D3 is connected to the drain pin Drain, and the negative electrode is connected to the positive electrode of the load 240 and the second end of the filter inductor L1. At this time, the first freewheeling diode D2 in the chip integrated module 100 is not connected to the control circuit 200 to form a loop, but the second freewheeling diode D3 is connected to the control circuit 200 to form a loop.

[0068] The control circuit 200 also includes a chopper 220, and two ends of the chopper 220 are respectively connected to the drain pin Drain and the load 240, and can be specifically connected to the negative electrode of the load 240. The chopper 220 is used to adjust the voltage output to the load 240. Specifically, in the embodiment of the present invention, the chopper 220 includes a chopper inductor L2, and two ends of the chopper inductor L2 are respectively connected to the drain pin Drain and the load 240.

[0069] The control circuit 200 further includes a sampling resistor Rcs, which is connected between the current signal sampling pin ISEN and the external ground terminal GND3 to sample the current in the control circuit. The first ground pin GND1 and the second ground pin GND2 in the chip integrated module 100 are both connected to the external ground terminal GND3.

[0070] The embodiment of the present invention provides a control circuit 200, which also includes an external resistor Rth / Rslp. The external resistor Rth / Rslp is connected between the control pin TH / SLP and the external ground terminal GND3, and the control circuit 200 determines the over-temperature protection threshold and the temperature-current curve slope of the chip integrated module 100 according to the resistance value of the external resistor Rth / Rslp. Obviously, the external resistor Rth / Rslp is an adjustable resistor.

[0071] The control circuit 200 of the embodiment of the present invention utilizes an external resistor Rth / Rslp to drive the logic control unit 10 to determine the over-temperature protection threshold and the temperature-current curve slope of the chip integrated module 100 according to the resistance value of the external resistor Rth / Rslp, that is, only one external resistor Rth / Rslp can be set to achieve two functions.

[0072] The control circuit 200 also includes an AC module 230, which includes an AC source AC and a fuse Fuse. The two ends of the AC source AC are respectively connected to the AC first input pin ACIN1 and the AC second input pin ACIN2; the fuse Fuse is connected between the AC source AC and any AC input pin ACIN to disconnect when the current exceeds a specified value, thereby protecting the chip integrated module 100.

[0073] In the embodiment of the present invention, the load 240 may include an LED light emitting unit, or other components that need to be powered by direct current. Figure 4 The load 240 includes a third capacitor EC3 and a parallel resistor RL which are arranged in parallel with the LED light emitting unit.

[0074] In addition, in the control circuit 200 of the present application, the capacitor of the filter 220 is arranged at the rear end of the rectifier unit D1, that is, the alternating current input by the alternating current source AC is first rectified and then filtered, so that the filter 220 does not need to use safety capacitors but can use electrolytic capacitors or film capacitors to achieve the filtering effect. Since electrolytic capacitors or film capacitors are smaller in size and lower in cost than safety capacitors, the chip integrated module 100 will not significantly increase the cost and volume after connecting the filter 220.

[0075] Embodiment 3

[0076] The embodiment of the present invention provides a control circuit 200', as shown in the attached Figure 5 As shown, the control circuit 200' includes a filter 210 and a chip integrated module 100 of the first embodiment. The filter 210 includes a filter inductor L1', and the filter inductor L1' includes a first end and a second end. The following mainly describes the differences between the control circuit 200' of this embodiment and the control circuit 200 in the second embodiment, and the other identical parts can refer to the control circuit 200 of the second embodiment.

[0077] In the embodiment of the present invention, the first end of the filter inductor L1' is connected to the first ground pin GND1 of the chip integrated module 100, and the second end of the filter inductor L1' is connected to the second ground pin GND2 of the chip integrated module 100, and the second ground pin GND2 is connected to the external ground terminal GND3 of the control circuit.

[0078] When the filter 210 is a π-type EMI filter, the filter 210 also includes a first filter capacitor EC1' and a second filter capacitor EC2', the negative electrodes of the first filter capacitor EC1' and the second filter capacitor EC2' are respectively connected to the first end and the second end of the filter inductor L1', and the positive electrodes of the first filter capacitor EC1' and the second filter capacitor EC2' are both connected to the load 240, that is, both are connected to the first voltage output pin Vin1 of the chip integrated module 100.

[0079] The first ground pin GND1 of the chip integrated module is not directly connected to the external ground terminal GND3 of the control circuit 200 , and a filter inductor L1 ′ is connected therebetween.

[0080] Figure 5 The control circuit 200' in the chip integrated module 100 uses the first freewheeling diode D2 in the chip integrated module 100 to realize the freewheeling function; it should be understood that Figure 5 The second voltage output pin Vin2 / NC can also be left empty, and the drain pin Drain is connected to a second freewheeling diode D3 to achieve the freewheeling function.

[0081] Embodiment 4

[0082] An embodiment of the present invention provides a lighting device, which includes a light-emitting unit LED and the control circuit 200 of the second or third embodiment, wherein the control circuit is used to input direct current to the light-emitting unit LED, and the light-emitting unit is used to emit lighting light.

[0083] It should be understood by those skilled in the art that, although the preferred embodiments of the present invention have been described, other changes and modifications may be made to these embodiments once those skilled in the art have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present invention.

[0084] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A chip integrated module, used for an inductor of an external filter, characterized in that: The chip integrated module comprises: an AC input pin, a first ground pin, a first voltage output pin, and a rectifier unit, wherein the rectifier unit has a rectifier input terminal, a rectifier output terminal, and a public reference terminal, the rectifier input terminal is connected to the AC input pin, the first ground pin is independently connected to the public reference terminal, and the first voltage output pin is independently connected to the rectifier output terminal; at least one of the first ground pin and the first voltage output pin is used to externally connect the inductance of the filter; The chip integrated module further includes: a current signal sampling pin, a second grounding pin and a control pin; the current signal sampling pin is used to connect an external sampling resistor to sample the current value in the control circuit; inside the chip integrated module, the second grounding pin is independent of the first grounding pin; the control pin is used to connect an external resistor, and the chip integrated module determines the over-temperature protection threshold value according to the resistance value of the external resistor; The chip integrated module also includes a switch tube and a logic control unit, the switch tube includes a source, a drain and a control electrode, the logic control unit has a current sampling end and a driving end, the source is connected to the current signal sampling pin and the current sampling end, and the driving end is connected to the control electrode to control the switch tube to be turned off or on.

2. The chip integrated module according to claim 1, characterized in that: The chip integrated module also includes a first freewheeling diode, a second voltage output pin and a drain pin, the anode of the first freewheeling diode is connected to the drain and the drain pin, and the cathode of the first freewheeling diode is connected to the second voltage output pin.

3. A control circuit, characterized in that: A chip integrated module comprising a filter, an external ground terminal and any one of claims 1 to 2, wherein the filter comprises a filter inductor, and the filter inductor comprises a first terminal and a second terminal; The first end is connected to the first voltage output pin, and the second end is used to connect to a load; or The first end is connected to the first ground pin, the second end is connected to the second ground pin of the chip integrated module, and the second ground pin is connected to the external ground end.

4. The control circuit according to claim 3, characterized in that: When the first end is connected to the first voltage output pin and the second end is used to connect to a load, the filter also includes a first filter capacitor and a second filter capacitor; the negative electrodes of the first filter capacitor and the second filter capacitor are both connected to the first ground pin, the positive electrode of the first filter capacitor is connected to the first end, and the positive electrode of the second filter capacitor is connected to the second end.

5. The control circuit according to claim 3, characterized in that: When the first end is connected to the first ground pin and the second end is connected to the second ground pin of the chip integrated module, the filter also includes a first filter capacitor and a second filter capacitor; the negative electrodes of the first filter capacitor and the second filter capacitor are respectively connected to the first end and the second end, and the positive electrodes of the first filter capacitor and the second filter capacitor are both used to connect to the load.

6. The control circuit according to claim 3, characterized in that: The chip integrated module further comprises: a drain pin; The control circuit further includes a chopper, and two ends of the chopper are respectively connected to the drain pin and the load.

7. The control circuit according to claim 3, characterized in that: The chip integrated module further comprises a current signal sampling pin, the control circuit comprises a sampling resistor, and the sampling resistor is connected between the current signal sampling pin and the external ground terminal.

8. The control circuit according to claim 3, characterized in that: The chip integrated module also includes a control pin; the control circuit includes an external resistor, which is connected between the control pin and the external ground terminal; the chip integrated module determines the over-temperature protection threshold and the slope of the temperature-current curve according to the resistance value of the external resistor.

9. A lighting device, characterized in that: It comprises a light-emitting unit and a control circuit as described in any one of claims 3 to 8, wherein the control circuit is used to input direct current to the light-emitting unit.

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