Low-power-consumption power-down shutter protection circuit

Abstract

According to the low-power-consumption power-down shutter protection circuit, when a product works normally, a shutter is controlled by a driving signal to complete corresponding opening and closing control, when the product is in abnormal power down or normal power down, the driving signal disappears, and under the combined action of a diode 1, a diode 2, an energy storage capacitor 1 and an energy storage capacitor 2, the power-down shutter is controlled to be opened and closed. The shutter driving chip and the closing control circuit work normally, the shutter can continue to be driven at the moment, under the condition that the driving signal disappears, the closing control circuit outputs a shutter closing signal to the shutter driving chip under the power supply of the energy storage capacitor 2, the shutter is controlled to be closed in a power-down mode, and therefore the safety of the detector is protected. The invention relates to the technical field of electric shutter protection. According to the low-power-consumption power-down shutter protection circuit, no extra logic control chip or power-down detection circuit is needed, meanwhile, damage to a detector after normal / abnormal power down is avoided, power consumption is low, time delay is avoided, multiple tests and actual use are already carried out, the effect is good, and the function is reliable.

Description

Technical Field

[0001] The present invention relates to the technical field of electric shutter protection, and particularly to a low-power power-off shutter protection circuit. Background Art

[0002] The characteristics of an infrared detector determine that when the infrared detector receives too strong external infrared energy, for example: the sun or other objects with a temperature much higher than the infrared thermal imaging temperature measurement range, it will cause the material characteristics of the sensor to change. After exceeding the tolerance range of the detector pixel, it will cause reversible or irreversible damage to the detector pixel, resulting in abnormal images and inaccurate temperature measurement. To avoid this situation, a low-power power-off shutter protection circuit is designed, which can automatically close the shutter after the product is powered off to protect the detector from damage.

[0003] The existing shutter closing can generally only be used to close during power-on. Its logic is generally to manually operate the product shutter to close. When encountering abnormal power-off, the system often cannot respond to perform the shutter closing operation. The existing power-off shutter protection circuits generally require corresponding feedback signals or logic determination circuits, and an additional control chip is required to perform the shutter closing operation. While adding shutter protection in this way, it also increases the power consumption of the product. The existing solutions require additional logic determination circuits and add corresponding additional control systems, resulting in higher costs and increased system power consumption. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a low-power power-off shutter protection circuit, which realizes the automatic closing of the shutter during power-off without adding an additional power-off detection circuit to the product. Without increasing the power consumption of the product, it can realize the automatic shutter protection function after the detector is powered off without additional feedback signals and logic circuits.

[0006] (2) Technical Solutions

[0007] To achieve the above objectives, the present invention is realized through the following technical solutions: A low-power power-off shutter protection circuit includes power supply 1, diode 1, energy storage capacitor 1, power supply 2, energy storage capacitor 2, a closing control circuit, a shutter driving chip, and a shutter. The power supply 1 is used to supply power to the driving chip.

[0008] The diode 1 is used to prevent current backflow and ensure that as much energy stored in the energy storage capacitor 1 as possible acts on the shutter driving chip after the circuit is powered off.

[0009] The energy storage capacitor 1 is used to continue to supply power to the driving chip after the circuit is powered off.

[0010] The power supply 2 is used to supply power to the closed control circuit and the logic control power supply of the shutter drive chip;

[0011] The diode 2 is used to prevent current backflow and ensure that the energy stored in the energy storage capacitor 2 is used to maintain the closed control circuit after the circuit loses power;

[0012] The energy storage capacitor 2 is used to continue to supply power to the closed control circuit and the logic control power supply of the shutter drive chip after the circuit loses power.

[0013] Preferably, the closed control circuit is a circuit that outputs a shutter closed signal in the default power-off state and can receive a drive signal to transfer to the shutter drive chip.

[0014] Preferably, the shutter drive chip is used to control the opening and closing of the shutter according to the control logic signal under a given power supply condition.

[0015] Preferably, the shutter is controlled by the shutter drive chip to open and close itself.

[0016] Preferably, the drive signal is a relevant control signal issued by the product control chip for controlling the opening and closing of the shutter.

[0017] Preferably, when the product is working normally, the shutter accepts the drive signal control to complete the corresponding opening and closing control. When the product loses power abnormally or normally, the drive signal disappears. Under the combined action of diode 1, diode 2, energy storage capacitor 1, and energy storage capacitor 2, the shutter drive chip and the closed control circuit work normally, and the shutter can continue to be driven at this time.

[0018] Preferably, in the case where the drive signal disappears, the closed control circuit outputs a shutter closed signal to the shutter drive chip under the power supply of the energy storage capacitor 2, controlling the shutter to close when losing power, thereby protecting the safety of the detector.

[0019] Preferably, the diode 1 and the diode 2 can be replaced with a unidirectional conduction circuit for use.

[0020] (III) Beneficial effects

[0021] The present invention provides a low-power power-down shutter protection circuit. Compared with the prior art, it has the following beneficial effects: in this low-power power-down shutter protection circuit, when the product is working normally, the shutter is controlled by a drive signal to complete corresponding opening and closing controls. When the product has an abnormal power-down or a normal power-down, the drive signal disappears. Under the combined action of diode 1, diode 2, energy storage capacitor 1, and energy storage capacitor 2, the shutter drive chip and the closing control circuit work normally, and the shutter can continue to be driven at this time. In the case where the drive signal disappears, the closing control circuit outputs a shutter closing signal to the shutter drive chip under the power supply of energy storage capacitor 2 to control the shutter to perform a power-down closing, thereby protecting the safety of the detector. Without the need for an additional logic control chip or a power-down detection circuit, damage to the detector after normal / abnormal power-down is achieved, with low power consumption and no delay. It has undergone multiple tests and actual use, with good effects and reliable functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a block diagram of the structural principle of the present invention;

[0023] Figure 2 It is a circuit diagram of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0025] Please refer to Figure 1-2 , the embodiments of the present invention provide five technical solutions: a low-power power-down shutter protection circuit, specifically including the following embodiments:

[0026] Embodiment 1: A low-power power-down shutter protection circuit includes power supply 1, diode 1, energy storage capacitor 1, power supply 2, energy storage capacitor 2, a closing control circuit, a shutter drive chip, and a shutter. Power supply 1 is used to supply power to the drive chip;

[0027] Diode 1 is used to prevent current backflow and ensure that as much energy storage of energy storage capacitor 1 as possible acts on the shutter drive chip after the circuit is powered down;

[0028] Energy storage capacitor 1 is used to continue to supply power to the drive chip after the circuit is powered down;

[0029] Power supply 2 is used to supply power to the logic control power supply of the closing control circuit and the shutter drive chip;

[0030] The diode 2 is used to prevent current backflow and ensure that the energy stored in the energy storage capacitor 2 is used to maintain the closed control circuit after the circuit loses power.

[0031] The energy storage capacitor 2 is used to continue to supply power to the logic control power supplies of the closed control circuit and the shutter driving chip after the circuit loses power.

[0032] In the embodiment of the present invention, the closed control circuit is a circuit that is a shutter closing signal in the default power-off state and can receive a driving signal to transmit to the shutter driving chip.

[0033] In the embodiment of the present invention, the shutter driving chip is used to complete the control of the shutter opening and closing according to the control logic signal under a given power supply condition.

[0034] In the embodiment of the present invention, the shutter accepts the control of the shutter driving chip to open and close itself.

[0035] In the embodiment of the present invention, the driving signal is a relevant control signal sent by the product control chip for controlling the shutter opening and closing.

[0036] Embodiment 2: A low-power power-off shutter protection circuit, including power supply 1, diode 1, energy storage capacitor 1, power supply 2, energy storage capacitor 2, closed control circuit, shutter driving chip and shutter. The power supply 1 is used to supply power to the driving chip;

[0037] The diode 1 is used to prevent current backflow and ensure that as much as possible of the energy stored in the energy storage capacitor 1 acts on the shutter driving chip after the circuit loses power.

[0038] The energy storage capacitor 1 is used to continue to supply power to the driving chip after the circuit loses power;

[0039] The power supply 2 is used to supply power to the logic control power supplies of the closed control circuit and the shutter driving chip;

[0040] The diode 2 is used to prevent current backflow and ensure that the energy stored in the energy storage capacitor 2 is used to maintain the closed control circuit after the circuit loses power.

[0041] The energy storage capacitor 2 is used to continue to supply power to the logic control power supplies of the closed control circuit and the shutter driving chip after the circuit loses power.

[0042] In the embodiment of the present invention, the closed control circuit is a circuit that is a shutter closing signal in the default power-off state and can receive a driving signal to transmit to the shutter driving chip.

[0043] In the embodiment of the present invention, the shutter driving chip is used to complete the control of the shutter opening and closing according to the control logic signal under a given power supply condition.

[0044] In the embodiment of the present invention, the shutter accepts the control of the shutter driving chip to open and close itself.

[0045] The drive signal is a relevant control signal sent by the product control chip for controlling the opening and closing of the shutter.

[0046] In the embodiment of the present invention, when the product is working normally, the shutter accepts the drive signal control to complete the corresponding opening and closing control. When the product has an abnormal power failure or a normal power failure, the drive signal disappears. Under the combined action of diode 1, diode 2, energy storage capacitor 1, and energy storage capacitor 2, the shutter drive chip and the closing control circuit work normally. At this time, the shutter can continue to be driven. In the case where the drive signal disappears, the closing control circuit outputs a shutter closing signal to the shutter drive chip under the power supply of energy storage capacitor 2 to control the shutter to perform a power-down closing, thereby protecting the safety of the detector.

[0047] Embodiment 3: The difference between the embodiment of the present invention and Embodiment 2 is that diode 1 and diode 2 can be replaced with a one-way conduction circuit for use.

[0048] Embodiment 4: The difference between the embodiment of the present invention and Embodiment 2 is that energy storage capacitor 1 and energy storage capacitor 2 can be replaced with other energy storage devices.

[0049] Embodiment 5: The difference between the embodiment of the present invention and Embodiment 2 is that the closing control circuit can be replaced with other closing control chips.

[0050] In summary, in the present invention, when the product is working normally, the shutter accepts the drive signal control to complete the corresponding opening and closing control. When the product has an abnormal power failure or a normal power failure, the drive signal disappears. Under the combined action of diode 1, diode 2, energy storage capacitor 1, and energy storage capacitor 2, the shutter drive chip and the closing control circuit work normally. At this time, the shutter can continue to be driven. In the case where the drive signal disappears, the closing control circuit outputs a shutter closing signal to the shutter drive chip under the power supply of energy storage capacitor 2 to control the shutter to perform a power-down closing, thereby protecting the safety of the detector. Without the need for an additional logic control chip or a power-down detection circuit, damage to the detector after normal / abnormal power-down is achieved, with low power consumption, no delay, and having been tested and used in actual situations for many times, with good effects and reliable functions.

[0051] Meanwhile, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0052] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprising", "including" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements not only includes those elements but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0053] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A low-power power-down shutter protection circuit, characterized in that: It includes power supply 1, diode 1, energy storage capacitor 1, power supply 2, energy storage capacitor 2, a closing control circuit, a shutter driving chip, and a shutter. The power supply 1 is used to supply power to the driving chip. The diode 1 is used to prevent current backflow and ensure that as much energy stored in the energy storage capacitor 1 as possible acts on the shutter driving chip after the circuit loses power. The energy storage capacitor 1 is used to continue supplying power to the driving chip after the circuit loses power. The power supply 2 is used to supply power to the closing control circuit and the logic control power supply of the shutter driving chip. The diode 2 is used to prevent current backflow and ensure that the energy stored in the energy storage capacitor 2 is used to maintain the closing control circuit after the circuit loses power. The energy storage capacitor 2 is used to continue supplying power to the closing control circuit and the logic control power supply of the shutter driving chip after the circuit loses power.

2. The low-power power-down shutter protection circuit according to claim 1, wherein: The closing control circuit is a circuit that outputs a shutter closing signal in the default power-off state and can receive a driving signal to transfer to the shutter driving chip.

3. A low-power power-down shutter protection circuit according to claim 1, characterized in that: The shutter driving chip is used to control the opening and closing of the shutter according to the control logic signal under a given power supply condition.

4. A low-power power-down shutter protection circuit according to claim 1, characterized in that: The shutter receives the control of the shutter driving chip to open and close itself.

5. A low-power power-down shutter protection circuit according to claim 1, characterized in that: The driving signal is a relevant control signal issued by the product control chip for controlling the opening and closing of the shutter.

6. The low-power power-down shutter protection circuit according to claim 5, wherein: When the product is working normally, the shutter receives the control of the driving signal to complete the corresponding opening and closing control. When the product abnormally loses power or normally loses power, the driving signal disappears. Under the combined action of diode 1, diode 2, energy storage capacitor 1, and energy storage capacitor 2, the shutter driving chip and the closing control circuit work normally, and the shutter can continue to be driven at this time.

7. The low-power power-down shutter protection circuit according to claim 6, characterized in that: In the case where the driving signal disappears, the closing control circuit outputs a shutter closing signal to the shutter driving chip under the power supply of the energy storage capacitor 2 to control the shutter to close during power-off, thereby protecting the safety of the detector.

8. A low-power power-down shutter protection circuit according to claim 1, characterized in that: The diode 1 and diode 2 can be replaced with a unidirectional conduction circuit for use.

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