CN114487934A - Load detection circuit and lighting device - Google Patents
Load detection circuit and lighting device Download PDFInfo
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- CN114487934A CN114487934A CN202111676425.0A CN202111676425A CN114487934A CN 114487934 A CN114487934 A CN 114487934A CN 202111676425 A CN202111676425 A CN 202111676425A CN 114487934 A CN114487934 A CN 114487934A
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- 238000001514 detection method Methods 0.000 title claims abstract description 87
- 238000005070 sampling Methods 0.000 claims abstract description 83
- 238000007493 shaping process Methods 0.000 claims description 36
- 230000003321 amplification Effects 0.000 claims description 31
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 31
- 238000010586 diagram Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 5
- 230000003111 delayed effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/66—Testing of connections, e.g. of plugs or non-disconnectable joints
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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Abstract
The application relates to a load detection circuit and a lighting device, the load detection circuit includes: the sampling module is used for being connected with a load and is configured to output a sampling voltage when a driving power supply is connected with the load; the output module is configured to output a corresponding detection signal according to the sampling voltage at the output end of the sampling module after receiving the starting signal; the current control module is used for limiting the current output to the ground end by the sampling module; the current control module is also configured to be switched on or off according to the switch control signal; after the starting signal is transmitted to the output module, the switch control signal is transmitted to the current control module. Through the load detection circuit and the load detection method, whether the load is connected with the driving power supply or not can be detected only through weak current on the load, and meanwhile, after the output module outputs the detection signal, the current control module can be automatically and thoroughly turned off, so that the power consumption of the load detection circuit is reduced to 0.
Description
Technical Field
The application belongs to the technical field of detection circuits, and particularly relates to a load detection circuit and a lighting device.
Background
At present, in a conventional load driving circuit, it is often necessary to detect whether a load is connected to a power supply, so as to ensure that a driving voltage output by the power supply cannot be transmitted to the load when the load is driven because the load is not successfully connected to the power supply.
Especially for the lighting system, whether the light emitting module is successfully connected with the power supply or not has an important indicating function for setting the lighting mode of the lighting system.
The conventional detection circuit for detecting whether the load is successfully connected with the power supply usually needs to enable the load and the power supply to form a complete loop, so that the load can be detected only when the load works and has a large current, and the light emitting module of the lighting system can be directly lightened, thereby affecting the normal work of the lighting system. And the conventional detection circuit can not close the detection loop by itself when the detection is finished, so that the detection circuit consumes power continuously.
Disclosure of Invention
The application aims to provide a load detection circuit and a lighting device, and aims to solve the problem that the detection circuit continuously consumes power in the traditional detection circuit.
A first aspect of an embodiment of the present application provides a load detection circuit, including: the sampling module is used for connecting an input end of the sampling module with a load, and is configured to output a sampling voltage when a driving power supply is connected with the load; the input end of the output module is connected with the output end of the sampling module, and the output module is configured to output a corresponding detection signal according to the sampling voltage at the output end of the sampling module after receiving a starting signal; the current control module is arranged between the output end of the sampling module and the ground end and is used for limiting the current output to the ground end by the sampling module; the current control module is further configured to turn on or off according to a switch control signal; the starting signal is transmitted to the output module firstly, and is used for turning off the switch control signal of the current control module and then transmitting the switch control signal to the current control module, so that the output module can output the detection signal before the current control module is turned off.
In one embodiment, the power supply further includes a detection control module, the detection control module is respectively connected to the current control module and the output module, and the detection control module is configured to output the start signal and output the switch control signal for turning off the current control module to the current control module according to the start signal.
In one embodiment, the sampling module includes a first current-limiting resistor, a first end of the first current-limiting resistor is used for being connected to a load, a second end of the first current-limiting resistor is an output end of the sampling module, and the sampling module is used for generating a corresponding sampling voltage at the second end of the first current-limiting resistor when the load is connected to the driving power supply.
In one embodiment, the output module includes a first amplification and shaping unit and a flip-flop, an input end of the first amplification and shaping unit is connected with an output end of the sampling module, an output end of the first amplification and shaping unit is connected with a first input end of the flip-flop, and a second input end of the flip-flop is configured to receive the start signal; the first amplification and shaping unit is configured to generate a corresponding sampling level according to a sampling voltage at an output end of the sampling module, and the flip-flop is configured to output the sampling level as the detection signal when the second output end of the flip-flop receives the start signal.
In one embodiment, the first amplification and shaping unit includes a first inverter and a second inverter, an input terminal of the first inverter is connected to an output terminal of the sampling module, an output terminal of the first inverter is connected to an input terminal of the second inverter, and an output terminal of the second inverter is connected to a first input terminal of the flip-flop.
In one embodiment, the current control module includes a switch tube and a current limiting unit, a first conduction end of the switch tube is connected to an output end of the sampling module, a second conduction end of the switch tube is connected to an input end of the current limiting unit, an output end of the current limiting unit is connected to the ground, a controlled end of the switch tube is used for receiving the switch control signal, the switch tube is configured to be turned on or off according to the switch control signal, and the current limiting unit is used for limiting a current transmitted from the current control module to the ground.
In one embodiment, the current limiting unit includes a current limiting tube, a first conduction end of the current limiting tube is connected to a second conduction end of the switch tube, a second conduction end of the current limiting tube is connected to the ground end, and the current limiting tube is kept off so as to enable only micro-current to pass through the current limiting tube.
In one embodiment, the detection control module includes a control unit, and the control unit is connected to the output module and the current control module respectively, so as to output the start signal and the switch control signal respectively.
In one embodiment, the detection control module includes a start power supply, a second amplification and shaping unit, and an inverting unit, the start power supply is connected to an input end of the second amplification and shaping unit, and an output end of the second amplification and shaping unit is connected to the output module, so as to output the start signal to the output module when the start power supply outputs a voltage; the second amplification and shaping unit is further connected with the input end of the phase reversal unit, and the output end of the phase reversal unit is connected with the current control module so as to output the switch control signal to the current control module according to the starting signal.
A second aspect of the embodiments of the present application provides a lighting device, including a lighting module and the load detection circuit as described above, where the load detection circuit is connected to the lighting module for detecting whether the lighting module is successfully connected to the driving power supply.
Compared with the prior art, the embodiment of the application has the advantages that: when the output module outputs the detection signal, the current control module can be automatically and thoroughly turned off, so that the power consumption of the load detection circuit is reduced to 0. Meanwhile, the current output by the sampling module is limited by the current control module, so that the current in a loop formed by the sampling module, the current control module and the load is extremely small, but the output module can output a corresponding detection signal, and whether the load is connected with a driving power supply is detected.
Drawings
Fig. 1 is a schematic block diagram of a load detection circuit according to a first embodiment of the present application;
fig. 2 is a circuit schematic diagram of a load detection circuit according to a first embodiment of the present application;
fig. 3 is a circuit schematic diagram of a load detection circuit according to another embodiment of the present application;
fig. 4 is a schematic block diagram of a lighting device according to a second embodiment of the present application.
The above figures illustrate: 10. a lighting module; 20. a load detection circuit; 100. a sampling module; 200. an output module; 210. a first amplification and shaping unit; 300. a current control module; 310. a current limiting unit; 400. a detection control module; 410. a second amplification and shaping unit; 420. and an inverting unit.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present application.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless specifically limited otherwise.
Fig. 1 shows a schematic block diagram of a load detection circuit provided in a first embodiment of the present application, and for convenience of illustration, only the parts related to the present embodiment are shown, and detailed as follows:
a load detection circuit 20 includes a sampling module 100, an output module 200, and a current control module 300.
The input end of the sampling module 100 is configured to be connected to the load RT, and the sampling module 100 is configured to output a sampling voltage when the driving power source is connected to the load RT. The input end of the output module 200 is connected to the output end of the sampling module 100, and the output module 200 is configured to output a corresponding detection signal according to the sampling voltage at the output end of the sampling module 100 after receiving the start signal. The current control module 300 is disposed between the output end of the sampling module 100 and the ground, and the current control module 300 is configured to limit the current output from the sampling module 100 to the ground, that is, limit the current on the load RT, and avoid the current on the load RT from being too large; the current control module 300 is further configured to turn on or off according to the switch control signal. After the start signal is transmitted to the output module 200, the switch control signal for turning off the current control module 300 is transmitted to the current control module 300, so as to ensure that the output module 200 can output the detection signal before the current control module 300 is turned off.
It should be noted that, after the load RT is connected to the driving power supply, the load RT may be connected to the ground end sequentially through the sampling module 100 and the current control module 300, so as to form a complete loop, and meanwhile, since the current control module 300 limits the current output by the sampling module 100, the current in the whole loop is extremely small. Meanwhile, after the start signal control output module 200 outputs the corresponding detection signal, the switch control signal automatically turns off the current control module 300, so that the loop of the load RT is completely disconnected, and the quiescent current becomes 0.
As shown in fig. 2, in the present embodiment, the load detection circuit 20 further includes a detection control module 400, the detection control module 400 is respectively connected to the current control module 300 and the output module 200, and the detection control module 400 is configured to output a start signal and output a switch control signal to the current control module 300 according to the start signal.
As shown in fig. 2, in this embodiment, the sampling module 100 includes a first current-limiting resistor R1, a first end of the first current-limiting resistor R1 is a sampling end and is used for being connected to the load RT, a second end of the first current-limiting resistor R1 is an output end of the sampling module 100, and the sampling module 100 is used for generating a corresponding sampling voltage at a second end of the first current-limiting resistor R1 when the load RT is connected to the driving power supply. The first current limiting resistor R1 can limit the current transmitted from the load RT to a certain extent, so as to protect the current control module 300 and avoid the current flowing into the current control module 300 from being too large.
As shown in fig. 2, in this embodiment, the sampling module 100 further includes a second current limiting resistor R2, the second current limiting resistor R2 is disposed between the output terminal of the sampling module 100 and the output module 200, a first end of the second current limiting resistor R2 is connected to the output terminal of the sampling module 100, a second end of the second current limiting resistor R2 is connected to the input terminal of the output module 200, and the second current limiting resistor R2 is used to protect the output module 200 and prevent the current flowing into the output module 200 from being too large.
As shown in fig. 2, in the present embodiment, the output module 200 includes a first amplification and shaping unit 210 and a flip-flop U6, an input terminal of the first amplification and shaping unit 210 is an input terminal of the output module 200 and is configured to be connected to the sampling module 100, an output terminal of the first amplification and shaping unit 210 is connected to a first input terminal of a flip-flop U6, and a second input terminal of a flip-flop U6 is configured to receive an enable signal. The first amplification and shaping unit 210 is configured to generate a corresponding sampling level according to the sampling voltage at the output terminal of the sampling module 100, and the flip-flop U6 is configured to output the sampling level at the first input terminal as the detection signal at the output terminal OUT of the flip-flop U6 when the second output terminal of the flip-flop U6 receives the start signal. The flip-flop U6 may be a D flip-flop, the output OUT of the flip-flop U6 is a Q terminal of the D flip-flop, the first input terminal is a D terminal of the D flip-flop, and the second input terminal is a clock input terminal of the D flip-flop.
Specifically, the first amplification and shaping unit 210 includes a first inverter U1 and a second inverter U2, an input terminal of the first inverter U1 is connected to the sampling module 100 as an input terminal of the output module 200, an output terminal of the first inverter U1 is connected to an input terminal of the second inverter U2, and an output terminal of the second inverter U2 is connected to a first input terminal of the flip-flop U6.
It should be noted that, when the load RT is not connected to the driving power supply, and the sampling voltage is 0, the output end of the first inverter U1 outputs a high level, the output end of the second inverter U2 correspondingly outputs a low level, and at this time, the sampling level is a low level, and the detection signal is also a low level. When the load RT is connected to the driving power supply and the sampling voltage rises, the output end of the first inverter U1 outputs a low level, the output end of the second inverter U2 correspondingly outputs a high level, and at this time, the sampling level is a high level, and the detection signal is also a high level. According to the embodiment, the sampling voltage can be shaped and amplified regardless of specific sampling voltage parameters, and whether the load RT is connected with the driving power supply or not can be judged only through the sampling level.
As shown in fig. 2, in the present embodiment, the current control module 300 includes a switching tube Q1 and a current limiting unit 310, a first conducting terminal of the switching tube Q1 is connected to the output terminal of the sampling module 100, a second conducting terminal of the switching tube Q1 is connected to the input terminal of the current limiting unit 310, the output terminal of the current limiting unit 310 is connected to the ground, a controlled terminal of the switching tube Q1 is configured to receive a switching control signal, the switching tube Q1 is configured to be turned on or off according to the switching control signal, and the current limiting unit 310 is configured to limit the current transmitted to the ground by the current control module 300.
Specifically, the current limiting unit 310 comprises a current limiting tube Q2, a first conducting end of the current limiting tube Q2 is connected with a second conducting end of the switch tube Q1, a second conducting end of the current limiting tube Q2 is connected with a ground end, and the current limiting tube Q2 is kept off so as to enable micro current to pass through the current limiting tube Q2 only.
The switch tube Q1 may be an enhancement NMOS tube, the current-limiting tube Q2 may be a depletion NMOS tube, and the controlled end of the current-limiting tube Q2 is connected to the ground end. It should be noted that the controlled terminal of the depletion type NMOS transistor can still pass through micro-current of microampere level, i.e. the current-limiting transistor Q2 always remains on. In this embodiment, the first conducting terminal of the switch Q1 is the drain of the enhancement NMOS transistor, the second conducting terminal of the switch Q1 is the source of the enhancement NMOS transistor, and the controlled terminal of the switch Q1 is the gate of the enhancement NMOS transistor. The first conduction end of the current limiting tube Q2 is the drain electrode of the depletion type NMOS tube, the second conduction end of the current limiting tube Q2 is the source electrode of the depletion type NMOS tube, and the controlled end of the current limiting tube Q2 is the grid electrode of the depletion type NMOS tube.
As shown in fig. 2, in the present embodiment, the detection control module 400 includes a start power VIN, a second amplification and shaping unit 410, and an inverting unit 420, where the start power VIN is connected to an input end of the second amplification and shaping unit 410, and an output end of the second amplification and shaping unit 410 is connected to the output module 200, so as to output a start signal to the output module 200; the second amplifying and shaping unit 410 is further connected to an input terminal of the inverting unit 420, and an output terminal of the inverting unit 420 is connected to the current control module 300, so as to output a switch control signal to the current control module 300. The start-up power VIN may be used to start up the load RT, so that when the load RT is ready to be started, the detection of whether the load RT is connected to the driving power is performed first.
Specifically, the second amplification and shaping unit 410 comprises a third inverter U3 and a fourth inverter U4, wherein an input terminal of the third inverter U3 is connected to the starting power VIN, an output terminal of the third inverter U3 is connected to an input terminal of the fourth inverter U4, and an output terminal of the fourth inverter U4 is connected to a second input terminal of the flip-flop U6. The inverting unit 420 comprises a fifth inverter U5, an input terminal of the fifth inverter U5 is connected to an output terminal of the fourth inverter U4, and an output terminal of the fifth inverter U5 is connected to the controlled terminal of the switching tube Q1.
It should be noted that, when the start-up power supply VIN does not output a voltage, the output end of the second amplifying and shaping unit 410 is at a low level, the inverting unit 420 outputs a high-level switch control signal, and the switching tube Q1 is turned on; after the switch Q1 is turned on, the first input terminal of the flip-flop U6 may receive a corresponding sampling level. After the voltage output by the start power VIN is detected, the second amplifying and shaping unit 410 outputs a high-level start signal to make the output terminal OUT of the flip-flop U6 output a sampling level (detection signal) of the first input terminal, and then the inverting unit 420 outputs a low-level switch control signal according to the start signal to turn off the switch transistor Q1, at this time, the quiescent current in the load detection circuit 20 is 0, and the output of the detection signal is completed.
The start power VIN may be a power supply for starting the detected load RT or other working power supplies that are powered on synchronously with the driving power supply. In this embodiment, it is possible to detect whether the load RT is connected to the driving power supply without a dedicated power supply, and it is also possible to individually control the turn-off of the current control module 300 without additional devices such as a control chip. When the detection is completed and the detection signal is outputted, the current control module 300 can be automatically turned off immediately, so that the power consumption of the load detection circuit 20 is reduced to 0.
In this embodiment, the detection control module 400 further includes a delay resistor R3 and a delay capacitor C1, the delay resistor R3 is connected in series between the input end of the second amplification and shaping unit 410 and the start power VIN, the first end of the delay capacitor C1 is connected to the input end of the second amplification and shaping unit 410, and the second end of the delay capacitor C1 is connected to the ground. The delay resistor R3 is used to reduce the current outputted by the start-up power VIN to protect the load detection circuit 20, and the delay resistor R3 and the delay capacitor C1 are also used to delay the electrical signal outputted by the start-up power VIN.
It should be noted that, if the driving power supply connected to the load RT and the starting power supply VIN are powered on simultaneously, the first input terminal of the flip-flop U6 cannot receive the sampling level at the first time because the load detection circuit 20 is provided with the first current-limiting resistor R1, the second current-limiting resistor R2 and the first amplifying and shaping unit 210. The electric signal output by the start power VIN can be further delayed through the delay resistor R3 and the delay capacitor C1, so that the start signal output by the second amplifying and shaping unit 410 reaches the flip-flop U6 later than the sampling level, and the flip-flop U6 can be guaranteed to output an accurate detection signal.
As shown in fig. 3, in another embodiment, the detection control module 400 includes a control unit U7, and the control unit U7 is connected to the output module 200 and the current control module 300 respectively, for outputting the start signal and the switch control signal respectively. The control unit U7 may be a single chip microcomputer or a microprocessor.
Fig. 4 shows a schematic block diagram of a lighting device provided in a second embodiment of the present application, and for convenience of illustration, only the portions related to the present embodiment are shown, which are detailed as follows:
a lighting device includes a lighting module 10 and a load detection circuit 20 as in the above embodiments. The lighting module 10 may be an LED lighting circuit, and the load detection circuit 20 is connected to the lighting module 10 for detecting whether the lighting module is successfully connected to the driving power supply, i.e. the lighting module 10 corresponds to the load RT of the above-mentioned embodiment.
The load detection circuit 20 can detect the connection condition between the lighting device 10 and the driving power supply when the lighting module 10 is ready to be started, and feed back the detection signal to the lighting module, so that the lighting module 10 configures its own working mode according to the detection signal and the preset program.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-mentioned division of the functional units and modules is illustrated, and in practical applications, the above-mentioned function distribution may be performed by different functional units and modules according to needs, that is, the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-mentioned functions. Each functional unit and module in the embodiments may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. A load detection circuit, comprising:
the sampling module is used for connecting an input end of the sampling module with a load, and is configured to output a sampling voltage when a driving power supply is connected with the load;
the input end of the output module is connected with the output end of the sampling module, and the output module is configured to output a corresponding detection signal according to the sampling voltage at the output end of the sampling module after receiving a starting signal;
the current control module is arranged between the output end of the sampling module and the ground end and is used for limiting the current output to the ground end by the sampling module; the current control module is further configured to turn on or off according to a switch control signal;
the starting signal is firstly transmitted to the output module, and is used for turning off the switch control signal of the current control module and then transmitting the switch control signal to the current control module, so as to ensure that the output module can output the detection signal before the current control module is turned off.
2. The load detection circuit according to claim 1, further comprising a detection control module, the detection control module being respectively connected to the current control module and the output module, the detection control module being configured to output the start signal and output the switch control signal for turning off the current control module to the current control module according to the start signal.
3. The load detection circuit according to claim 1 or 2, wherein the sampling module comprises a first current-limiting resistor, a first end of the first current-limiting resistor is used for being connected with a load, a second end of the first current-limiting resistor is an output end of the sampling module, and the sampling module is used for generating a corresponding sampling voltage at the second end of the first current-limiting resistor when the load is connected with the driving power supply.
4. The load detection circuit according to claim 1 or 2, wherein the output module comprises a first amplification and shaping unit and a flip-flop, an input terminal of the first amplification and shaping unit is connected with an output terminal of the sampling module, an output terminal of the first amplification and shaping unit is connected with a first input terminal of the flip-flop, and a second input terminal of the flip-flop is configured to receive the enable signal;
the first amplification and shaping unit is configured to generate a corresponding sampling level according to a sampling voltage at an output end of the sampling module, and the flip-flop is configured to output the sampling level as the detection signal when the second output end of the flip-flop receives the start signal.
5. The load detection circuit of claim 4, wherein the first amplification shaping unit comprises a first inverter and a second inverter, an input of the first inverter is connected to the output of the sampling module, an output of the first inverter is connected to an input of the second inverter, and an output of the second inverter is connected to the first input of the flip-flop.
6. The load detection circuit according to claim 1 or 2, wherein the current control module includes a switch tube and a current limiting unit, a first conducting terminal of the switch tube is connected to the output terminal of the sampling module, a second conducting terminal of the switch tube is connected to the input terminal of the current limiting unit, an output terminal of the current limiting unit is connected to the ground terminal, a controlled terminal of the switch tube is configured to receive the switch control signal, the switch tube is configured to be turned on or off according to the switch control signal, and the current limiting unit is configured to limit the magnitude of the current transmitted from the current control module to the ground terminal.
7. The load detection circuit of claim 6, wherein the current limiting unit comprises a current limiting tube, a first conducting terminal of the current limiting tube is connected to a second conducting terminal of the switching tube, a second conducting terminal of the current limiting tube is connected to the ground terminal, and the current limiting tube is kept off for passing only micro-current through the current limiting tube.
8. The load detection circuit of claim 2, wherein the detection control module comprises a control unit, and the control unit is respectively connected to the output module and the current control module for respectively outputting the start signal and the switch control signal.
9. The load detection circuit according to claim 2, wherein the detection control module comprises a start-up power supply, a second amplification and shaping unit and an inverting unit, the start-up power supply is connected with an input end of the second amplification and shaping unit, and an output end of the second amplification and shaping unit is connected with the output module and is used for outputting the start-up signal to the output module when the start-up power supply outputs a voltage; the second amplification and shaping unit is further connected with the input end of the phase reversal unit, and the output end of the phase reversal unit is connected with the current control module so as to output the switch control signal to the current control module according to the starting signal.
10. A lighting device comprising a lighting module and the load detection circuit as claimed in any one of claims 1 to 9, wherein the load detection circuit is connected to the lighting module for detecting whether the lighting module is successfully connected to the driving power supply.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117977491A (en) * | 2024-03-29 | 2024-05-03 | 辰芯半导体（深圳）有限公司 | Load detection protection circuit and device |
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|---|---|---|---|---|
| CN204559949U (en) * | 2015-03-27 | 2015-08-12 | 绵阳豪迈电子科技有限公司 | Possesses the current mode LED drive circuit of start detection function |
| CN105101560A (en) * | 2015-08-25 | 2015-11-25 | 无锡中星微电子有限公司 | LED drive circuit and LED drive system using same |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117977491A (en) * | 2024-03-29 | 2024-05-03 | 辰芯半导体（深圳）有限公司 | Load detection protection circuit and device |
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Address after: B201, zero one square, Xi'an Software Park, 72 Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant after: Tuoer Microelectronics Co.,Ltd. Address before: B201, zero one square, Xi'an Software Park, 72 Keji 2nd Road, high tech Zone, Xi'an City, Shaanxi Province, 710000 Applicant before: Xi'an Tuoer Microelectronics Co.,Ltd. |