CN219919228U

CN219919228U - Control circuit and carrier device

Info

Publication number: CN219919228U
Application number: CN202321370741.XU
Authority: CN
Inventors: 尤文兴
Original assignee: Meixinsheng Technology Beijing Co ltd
Current assignee: Meixinsheng Technology Beijing Co ltd
Priority date: 2023-05-31
Filing date: 2023-05-31
Publication date: 2023-10-27
Anticipated expiration: 2033-05-31

Abstract

The utility model provides a control circuit and carrier equipment, and relates to the technical field of illumination control. The control circuit includes: the discharging assembly, the control chip, the filter capacitor and the power supply assembly; the power supply component is connected with the discharging component and the control chip and is used for providing working electric energy for the control circuit based on the dimming signal; the filter capacitor is connected with the enabling end of the control chip, and the discharging component is connected with the filter capacitor; the discharging component is used for releasing the charge stored by the filter capacitor under the condition that the dimming signal is turned off so as to turn off the control chip under the condition that the dimming signal is turned off. The carrier device comprises: a control circuit and a load device; the load device is connected with the control circuit, and the control circuit is used for controlling the on-off operation of the load device. The discharging assembly is arranged to release the charges stored in the capacitor so as to close the control chip in real time, thereby reducing the delay time when the load device is closed and improving the dimming precision of the load device.

Description

Control circuit and carrier device

Technical Field

The utility model relates to the technical field of illumination control, in particular to a control circuit and carrier equipment.

Background

In various lighting systems, such as automotive lighting systems, there is a BCM dimming (i.e., power chopper dimming) mode. For the LED lighting system, as the LED lamp is a non-resistive load and the capacitor is arranged in the LED lighting system to meet electromagnetic compatibility, the control chip cannot be turned off in time in the BCM dimming process of the LED lighting system, and the dimming precision is adversely affected.

Disclosure of Invention

Therefore, an objective of the embodiments of the present utility model is to provide a control circuit and a carrier device, so as to solve the problem that the control chip in the prior art cannot be turned off in time, resulting in lower dimming precision.

In order to solve the above-mentioned problems, in a first aspect, an embodiment of the present utility model provides a control circuit including: the discharging assembly, the control chip, the filter capacitor and the power supply assembly;

the power supply assembly is connected with the discharging assembly and the control chip and is used for providing working electric energy for the control circuit based on the dimming signal;

the filter capacitor is connected with the enabling end of the control chip, and the discharging component is connected with the filter capacitor; the discharging component is used for releasing the charge stored by the filter capacitor under the condition that the dimming signal is turned off so as to turn off the control chip under the condition that the dimming signal is turned off.

In the implementation process, because the filter capacitor arranged in the control circuit stores charges under the condition that the dimming signal is turned on, the corresponding discharging component is arranged in the control circuit to be connected with the filter capacitor and the control chip, and the charges stored in the filter capacitor can be released under the condition that the dimming signal is turned off, so that the control chip is turned off timely under the condition that the dimming signal is turned off, the delay time of the control chip when the load device is turned off is reduced, the dimming precision is improved, the larger overshoot current caused by the fact that the control chip is always turned on is reduced, and the safety of the control circuit when in operation is improved.

Optionally, the discharge assembly includes: a triode;

the emitter of the triode is connected with the filter capacitor, the collector of the triode is grounded, and the base of the triode is connected with the power supply component;

the triode is used for being cut off when the dimming signal is started;

the triode is used for being conducted under the condition that the dimming signal is turned off, and releasing the charge stored by the filter capacitor so as to reduce the enabling voltage of the enabling end to be lower than the locking voltage;

the control chip is used for being closed under the condition that the enabling voltage is lower than the locking voltage.

In the implementation process, under the condition that the dimming signal is turned off due to the electric charge stored in the filter capacitor, the enabling voltage of the enabling end of the control chip is higher, and the control chip cannot be turned off in time, so that the triode can be arranged in the discharging component to be turned off under the condition that the dimming signal is turned on, and the triode is turned on under the condition that the dimming signal is turned off, so that the electric charge stored in the filter capacitor is released when the filtering capacitor is turned on, the enabling voltage of the enabling end of the control chip is reduced to be lower than the locking voltage, the control chip can be turned off under the condition that the enabling voltage is lower than the locking voltage, and the connected load device is controlled to be turned off, so that the turn-off efficiency of the control chip is further improved, the delay time when the load device is turned off by the control chip is reduced, and the dimming precision of the working process is improved.

Optionally, the discharge assembly further comprises: a first resistor;

the first end of the first resistor is connected with the emitter of the triode and the filter capacitor, and the second end of the first resistor is connected with the power supply component;

the first resistance of the first resistor is related to the charging current when the filter capacitor stores charge.

In the implementation process, in order to limit the charge current of the filter capacitor when storing charges, a first resistor connected with the triode, the filter capacitor and the power supply component can be arranged in the discharge component so as to limit the charge current of the filter capacitor, reduce adverse effects on the control circuit caused by overlarge charge current, reduce the quantity of charges stored in the filter capacitor and improve the subsequent charge releasing speed.

Optionally, the discharge assembly further comprises: a second resistor;

the first end of the second resistor is connected with the base electrode of the triode, and the second end of the second resistor is connected with the power supply component;

the second resistance of the second resistor is related to the discharge current when the filter capacitor discharges charges.

In the implementation process, in order to limit the magnitude of the discharge current when the filter capacitor discharges charges, a second resistor connected with the triode and the power supply component can be arranged in the discharge component so as to limit the conduction speed of the triode, thereby limiting the discharge current of the filter capacitor and reducing the adverse effect of overlarge discharge current on the control circuit, so that the filter capacitor can be safely and stably discharged.

Optionally, the control circuit further includes: a diode assembly;

the diode component is connected with the second end of the first resistor and the second end of the second resistor, and is used for unidirectionally transmitting the dimming signal sent by the power supply component.

In the implementation process, the diode component can be arranged in the control circuit so as to unidirectionally transmit the dimming signal sent by the power supply component to the discharging component and the control chip, thereby realizing the chopping dimming function of the power supply.

Optionally, the control chip includes an output end, and the output end is connected with a corresponding load device;

the control chip is used for controlling the load device to start working under the condition that the dimming signal is started;

the control chip is also used for controlling the load device to be closed under the condition that the dimming signal is closed.

In the implementation process, in order to control one or more load devices, corresponding output ends may be set in the control chip to connect with corresponding load devices, so as to control the load devices to be turned on and off under the condition of turning on and off the dimming signal, respectively, so as to realize corresponding dimming functions. Delay time for closing the load device by the control chip can be reduced, and dimming precision is improved.

Optionally, the control circuit further includes: a third resistor;

the third resistor is connected with two ends of the power supply component and is used for protecting the control circuit.

In the implementation process, a third resistor can be further arranged at two ends of the power supply component to form a loop with the power supply component under the condition that the dimming signal is closed, so that the control circuit is protected.

Optionally, the control circuit further includes: a fourth resistor;

the first end of the fourth resistor is connected with the adjusting end of the control chip, and the second end of the fourth resistor is grounded;

the adjusting end is used for adjusting the output current of the output end of the control chip based on the fourth resistance value of the fourth resistor.

In the implementation process, the adjusting end of the control chip can be connected with the corresponding fourth resistor, so that the adjusting end of the control chip can adjust the output current of the output end of the control chip based on the fourth resistor, and the output adjusting performance of the control chip is improved.

In a second aspect, embodiments of the present utility model further provide a carrier apparatus, the carrier apparatus including the control circuit and the load device described in any one of the above;

the load device is connected with the control circuit, and the control circuit is used for controlling the load device to be started or stopped.

In the implementation process, the control circuit and the load device can be arranged in the carrier equipment according to actual requirements, so that the load device is controlled to be started or stopped according to the control circuit, and the dimming function of the load is realized.

Optionally, the load device includes n light emitting devices, where the light emitting devices are non-resistive devices, and n is a positive integer greater than or equal to 1.

In the implementation process, the load devices may be non-resistive light emitting devices, and the number of load devices may be set and adjusted according to the requirements, so as to meet various different scene requirements.

In summary, the embodiment of the utility model provides a control circuit and carrier equipment, which are capable of releasing charges stored in a filter capacitor under the condition that a dimming signal is turned off by arranging a corresponding discharging component in the control circuit, so as to timely turn off a control chip under the condition that the dimming signal is turned off, thereby reducing delay time when the control chip turns off a load device, improving dimming precision, reducing larger overshoot current caused by the fact that the control chip is always turned on, and improving safety of the control circuit during operation.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments of the present utility model will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present utility model and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of a control circuit and a load assembly according to an embodiment of the present utility model;

FIG. 2 is a schematic diagram of another control circuit and load assembly according to an embodiment of the present utility model;

fig. 3 is a detailed schematic diagram of a control circuit and a load assembly according to an embodiment of the present utility model.

Icon: a 100-discharge assembly; 200-a control chip; VIN-enable; an OUT-output terminal; RISET-adjusting terminal; c1-a filter capacitor; v1-a power supply assembly; load-Load devices; LED 1-a first light emitting device; LED 2-second light emitting device; q1-triode; e-emitter; a B-base; r1-a first resistor; r2-a second resistor; d1—a diode assembly; r3-a third resistor; r4-fourth resistance.

Detailed Description

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present utility model. All other embodiments, which can be made by one of ordinary skill in the art based on embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the embodiments of the present utility model.

In various lighting systems today, such as automotive lighting systems, there is a BCM dimming (i.e. power chopper dimming) approach. In an LED lighting system, due to the consideration of EMC (Electromagnetic Compatibility ), an input needs to be added with a capacitor, and the existence of the capacitor leads to that the control chip cannot be turned off in time in the BCM dimming process of the LED lighting system, so that an input signal is changed: the rising edge time and the falling edge time of the LED current are changed, so that the current in the LED is no longer changed along with the input voltage, and the dimming precision is adversely affected.

In order to solve the above problems, the embodiments of the present utility model provide a control circuit, a control circuit and a corresponding load device that are disposed in a carrier device, where the carrier device may be an electronic device with a logic calculation function in a plurality of scenarios with dimming requirements, such as a vehicle device, a ship device, an indoor electronic device, and the like, and may timely turn off a control chip, thereby improving dimming precision.

Referring to fig. 1 and fig. 2, fig. 1 is a schematic structural diagram of a control circuit and a load assembly according to an embodiment of the present utility model, and fig. 2 is a schematic structural diagram of another control circuit and a load assembly according to an embodiment of the present utility model. The control circuit may include: the discharging assembly 100, the control chip 200, the filter capacitor C1 and the power supply assembly V1.

For example, the dimming signal sent from the power supply component V1 may be a BCM (chopper dimming) signal, where the frequency of BCM dimming is typically 0.1-1kHz, the dimming signal is a waveform signal of 0-12V, when the power supply component V1 is turned on, the dimming signal is turned on, the signal is 12V, and when the power supply component V1 is turned off, the dimming signal is turned off, and the signal is 0V. The filter capacitor C1 may be set to a capacitance of 0.01-1 μf, and the control chip 200 may be a constant current chip having a dimming control function of various types.

The power supply assembly V1 is connected to the discharging assembly 100 and the control chip 200, and the power supply assembly V1 is configured to provide operating power for the control circuit based on the dimming signal. One end of the filter capacitor C1 is connected to the enable end VIN of the control chip 200, the other end of the filter capacitor C1 is grounded, and the discharging component 100 is connected to the filter capacitor C1. Therefore, when the dimming signal is turned on, the control chip 200 is in a conductive state, the filter capacitor C1 stores charges, and the discharging device 100 is configured to release the charges stored in the filter capacitor C1 when the dimming signal is turned off, so as to turn off the control chip 200 when the dimming signal is turned off.

It should be noted that, the control chip 200 is connected to the Load device Load, and the Load device Load may be disposed at a high end or a low end, where fig. 1 shows a structure of a Load at a high end, and fig. 2 shows a structure of a Load at a low end, which can all be controlled by the control circuit to open or close the Load device Load in real time, so as to reduce delay time when the Load device Load is closed, and improve dimming precision of the Load device Load.

Referring to fig. 3, fig. 3 is a detailed schematic diagram of a control circuit and a load assembly according to an embodiment of the present utility model, wherein the discharge assembly 100 may include: transistor Q1, first resistor R1 and second resistor R2.

Alternatively, the transistor Q1 may be configured as a PNP transistor to implement a corresponding function according to different states of on and off.

The emitter E of the triode Q1 is connected with the filter capacitor C1 and the first end of the first resistor R1, so that the emitter E can be connected with the enabling end VIN of the control chip 200, the collector of the triode Q1 is grounded, and the base B of the triode Q1 is connected with the first end of the second resistor R2 to be connected with the power supply component V1; the second end of the first resistor R1 is connected with the power supply component V1; the second end of the second resistor R2 is connected to the power supply assembly V1.

When the power supply component V1 is started, the dimming signal is started, the voltage of the base electrode B of the triode Q1 is larger than the voltage of the emitter electrode E, namely VB > VE, so that the triode Q1 is cut off under the condition that the dimming signal is started; when the power supply component V1 is turned off, the dimming signal is turned off, the voltage of the base B of the transistor Q1 is smaller than the voltage of the emitter E, i.e. VB < VE, so that when the dimming signal is turned on, the transistor Q1 is turned on, and the charge stored in the filter capacitor C1 can be released through the transistor Q1, so that the enabling voltage of the enabling terminal VIN is reduced below the locking voltage, and the control chip 200 can be turned off when the enabling voltage is lower than the locking voltage.

Optionally, the first resistance of the first resistor R1 is related to the charging current when the filter capacitor C1 stores the electric charge, for example, the first resistance of the first resistor R1 may be set to 10k ohms, so as to limit the magnitude of the charging current when the filter capacitor C1 stores the electric charge, reduce the adverse effect of the excessive charging current on the control circuit, reduce the amount of the electric charge stored in the filter capacitor C1, and increase the speed of the subsequent discharging of the electric charge.

Optionally, the second resistance of the second resistor R2 is related to the discharge current when the filter capacitor C1 discharges the electric charge, for example, the second resistance of the second resistor R2 may be set to 10k ohms to limit the conduction speed of the transistor Q1, thereby limiting the magnitude of the discharge current of the filter capacitor C1, and reducing the adverse effect of the excessive discharge current on the control circuit, so that the filter capacitor C1 can be safely and stably discharged. It should be noted that, the second resistor R2 can also enhance the anti-interference capability of the control circuit when performing the EMC test, so as to optimize the control effect of the control circuit.

For example, when the triode Q1 is not set to release the stored charge of the filter capacitor C1, the enable voltage of the enable terminal VIN of the control chip 200 is 6V, and the off-lock voltage set in the control chip 200, that is, the UVLO, may be set to 1.5V, so that the enable voltage is higher than the lock voltage of the control chip 200, the control chip 200 cannot be turned off in time, and the chip is still in an on state before the next dimming signal arrives, which may cause a larger overshoot current to adversely affect the devices in the control circuit. When the control chip 200 controls the Load device Load according to the dimming signal, assuming that the maximum operating current of the Load device Load is 100mA and the input voltage of the control chip 200 is a 1% square wave signal, the operating current of the Load device Load is 1% by 100 ma=1 mA, and the input voltage of the control chip 200 is a 50% square wave signal, the operating current of the Load device Load is 50% by 100 ma=50 mA, so that different light-emitting brightnesses can be formed according to different input voltages. Therefore, the unstable input condition may also adversely affect the dimming accuracy of the Load device Load, and may also cause a long turn-off delay time, for example, the Load device Load is turned off after 20us after being turned off, etc. In the embodiment of the present utility model, the charge stored in the filter capacitor C1 can be released according to the set triode Q1, so that the enabling voltage of the enabling terminal VIN of the control chip 200 is reduced below the locking voltage, for example, the enabling voltage is reduced to 1V, which is smaller than 1.5V of the locking voltage, so that the control chip 200 can be turned off in real time when the dimming signal is turned off, the control chip 200 can be powered down normally in each working cycle, and when the next dimming signal arrives, the control chip 200 can be powered up again for soft start, so as to reduce the overshoot current flowing through the Load device Load, reduce the delay time when the control chip 200 turns off the Load device Load, for example, reduce the delay time of the turn-off from 20 μs to 5-6 μs, and improve the current precision flowing through the Load device Load, thereby improving the dimming precision of the Load device Load.

It should be noted that, in order to meet the dimming requirements in different scenarios, the control chip 200 may include an output terminal OUT, where the output terminal OUT is connected to a corresponding Load device Load, and n light emitting devices may be included in the Load device Load in the carrier device, where n is a positive integer greater than or equal to 1, so as to implement targeted control. By way of example, the light emitting device may be a non-resistive device having a light emitting function, such as various devices such as an LED lamp. In the embodiment shown in fig. 2 in the present utility model, only one n=2 is shown, and the case including two light emitting devices, that is, the first light emitting device LED1 and the second light emitting device LED2, will be described, and the case where n is another number will not be described again.

The Load device Load can be controlled to be started under the condition that the dimming signal is started, and the Load device Load is controlled to be closed under the condition that the dimming signal is closed through the connection of the output end OUT and the Load device Load. The quantity of Load devices connected with the output end OUT can be set or adjusted according to actual dimming requirements, and an accurate and high-precision dimming function is realized.

Optionally, the control circuit may further include: the diode component D1, the second end of the first resistor R1 and the second end of the second resistor R2 are connected to the diode component D1, and the diode component D1 can unidirectionally transmit the dimming signal sent by the power component V1 to the discharging component 100 and the control chip 200, so as to realize the chopper dimming function of the power supply.

Optionally, the control circuit may further include: and the third resistor R3 is connected with two ends of the power supply component V1. The third resistance value of the third resistor R3 may be selected and set according to the actual situation of the control circuit, for example, the third resistance value may be set to 100k ohms, and the third resistor R3 may form a loop with the power supply assembly V1 when the dimming signal is turned off, so as to protect the control circuit.

Optionally, the control circuit may further include: the first end of the fourth resistor R4 is connected to the adjusting end RISET of the control chip 200, the second end of the fourth resistor R4 is grounded, and the fourth resistance value of the fourth resistor R4 can be set according to the actual situation and the requirement of the control circuit, for example, the fourth resistance value is set to 10k ohms, so that the adjusting end RISET of the control chip 200 can adjust the output current of the output end OUT based on the fourth resistance value of the fourth resistor R4, and the output adjusting performance of the control chip 200 is improved.

In addition, the components in the embodiments of the present utility model may be integrated together to form a single part, or the components may exist separately, or two or more components may be integrated to form a single part.

The above description is only an example of the present utility model and is not intended to limit the scope of the present utility model, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.

The foregoing is merely illustrative of the present utility model, and the present utility model is not limited thereto, and any person skilled in the art will readily recognize that variations or substitutions are within the scope of the present utility model.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of additional identical elements in a process, article or apparatus that comprises the element.

In the several embodiments provided in the present utility model, it should be understood that the disclosed apparatus may be implemented in other manners. The apparatus embodiments described above are merely illustrative, for example, block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of devices according to various embodiments of the present utility model. In this regard, each block in the block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams, and combinations of blocks in the block diagrams, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.

Claims

1. A control circuit, the control circuit comprising: the discharging assembly, the control chip, the filter capacitor and the power supply assembly;

2. The control circuit of claim 1, wherein the discharge assembly comprises: a triode;

the triode is used for being cut off when the dimming signal is started;

3. The control circuit of claim 2, wherein the discharge assembly further comprises: a first resistor;

4. The control circuit of claim 3, wherein the discharge assembly further comprises: a second resistor;

5. The control circuit of claim 4, further comprising: a diode assembly;

6. The control circuit of claim 1, wherein the control chip comprises an output terminal connected to a corresponding load device;

7. The control circuit according to any one of claims 1 to 6, characterized in that the control circuit further comprises: a third resistor;

8. The control circuit according to any one of claims 1 to 6, characterized in that the control circuit further comprises: a fourth resistor;

9. A carrier device, characterized in that the carrier device comprises a control circuit according to any of claims 1-8 and a load device;

10. The carrier apparatus of claim 9, wherein the load device comprises n light emitting devices, the light emitting devices being non-resistive devices, n being a positive integer greater than or equal to 1.