CN114598025A - Power-down protection circuit and electronic equipment - Google Patents

Abstract

The application relates to a power-down protection circuit and electronic equipment, relates to power-down protection technical field, and includes: the power supply comprises a built-in power supply, a switch controller, a micro control unit and a power supply manager, wherein the built-in power supply is electrically connected with the switch controller, the power supply manager is used for connecting a load device, the load device comprises a plurality of electric energy receiving ends, the switch controller is coupled with the plurality of electric energy receiving ends through the power supply manager, the switch controller is also coupled with the power supply manager through the micro control unit, and the switch controller is used for switching a connecting circuit between the switch controller and the built-in power supply from off to on when the external power supply is connected and the external power supply is powered off so that the built-in power supply can provide electric energy for the micro control unit and the power supply manager; the micro control unit is used for sending a closing instruction carrying a preset time sequence to the power supply manager under the condition of detecting the power failure of the external power supply; and the power supply manager is used for controlling the plurality of electric energy receiving ends to stop supplying power in sequence according to a preset time sequence when receiving the closing instruction.

Description

Power-down protection circuit and electronic equipment

Technical Field

The embodiment of the application relates to the technical field of power failure protection, in particular to a power failure protection circuit and electronic equipment.

Background

At present, projectors generally adopt Digital Light Processing (DLP) technology in design, and the core of the DLP technology lies in a Digital Micromirror Device (DMD).

The DMD is provided with four power supply circuits, the power-on sequence and the power-off sequence of the four power supply circuits have strict time sequence requirements, and if the power-on or the power-off is not carried out according to the time sequence requirements, the DMD moves irregularly and even is knocked down, so that dead spots appear on the DMD, and the imaging quality is affected due to the fact that abnormal bright spots and dark spots appear on the imaging result of the projector. In practical situations, in the case of abnormal power failure, the above four power supply circuits of the DMD are powered down almost simultaneously, and the power down sequence in this situation is difficult to meet practical requirements.

Disclosure of Invention

An object of the embodiments of the present application is to provide a new technical solution for power-off protection.

According to a first aspect of the application, there is provided a power down comprising a circuit comprising: the power supply comprises a built-in power supply, a switch controller, a micro control unit and a power supply manager, wherein the built-in power supply is electrically connected with the switch controller, the power supply manager is used for connecting a load device, the load device comprises a plurality of electric energy receiving ends, the switch controller is coupled with the plurality of electric energy receiving ends of the load device through the power supply manager, and the switch controller is also coupled with the power supply manager through the micro control unit; the switch controller is used for switching a connecting line between the switch controller and the built-in power supply from off to on under the condition that the external power supply is connected and the external power supply is powered off so that the built-in power supply provides electric energy for the micro control unit and the power supply manager to maintain the micro control unit and the power supply manager to continuously run for a preset time; the micro control unit is used for sending a closing instruction carrying a preset time sequence to the power supply manager under the condition of detecting the power failure of the external power supply; and the power supply manager is used for sequentially stopping power supply to the plurality of electric energy receiving ends according to a preset time sequence under the condition of receiving the closing instruction.

Optionally, the power-down protection circuit further includes a power voltage conversion module, the power voltage conversion module is coupled with the micro control unit, and the power voltage conversion module is configured to output a high-level signal when the switch controller switches on the external power supply and output a low-level signal when the switch controller switches off the external power supply; the micro control unit is further configured to: and determining that the external power supply is powered off under the condition that the voltage output by the power supply voltage conversion module is converted from a high level to a low level.

Optionally, the switch controller is further configured to: when a connection line between the switch controller and the internal power supply is turned on and an electric signal from an external power supply is received, the connection line between the switch controller and the internal power supply is turned on and off.

Optionally, the switch controller is a two-way relay.

Optionally, the power of the built-in power supply satisfies: and maintaining the continuous operation of the micro control unit and the power manager for a preset time less than a preset time threshold.

Optionally, the preset time threshold is less than or equal to 3 s.

According to a second aspect of the present application, there is also provided an electronic device comprising a load device and a power down protection circuit as described in the first aspect above, the load device comprising a plurality of power receiving terminals, the power down protection circuit being configured to couple with the plurality of power receiving terminals of the load device.

Optionally, the load device is a digital micromirror device.

An advantage of the embodiment of the present application lies in that a power down protection circuit can be provided, including: the power supply comprises a built-in power supply, a switch controller, a micro control unit and a power supply manager, wherein the built-in power supply is electrically connected with the switch controller, the power supply manager is used for connecting a load device, the load device comprises a plurality of electric energy receiving ends, the switch controller is coupled with the plurality of electric energy receiving ends of the load device through the power supply manager, and the switch controller is also coupled with the power supply manager through the micro control unit; the switch controller is used for switching a connecting line between the switch controller and the built-in power supply from off to on under the condition that the external power supply is connected and the external power supply is powered off so that the built-in power supply provides electric energy for the micro control unit and the power supply manager to maintain the micro control unit and the power supply manager to continuously run for a preset time; the micro control unit is used for sending a closing instruction carrying a preset time sequence to the power supply manager under the condition of detecting the power failure of the external power supply; and the power supply manager is used for sequentially stopping power supply to the plurality of electric energy receiving ends according to a preset time sequence under the condition of receiving the closing instruction. Therefore, the embodiment of the application can realize the function of the projector, after the projector is powered on by external power, in the case of sudden power failure caused by the fact that the external power is pulled off or equipment is in failure, the micro control unit and the power manager coupled to the DMD can continue to be supplied with power through the built-in battery, so that the micro control unit and the power manager can continue to operate for a preset time, the micro control unit sends a closing instruction with preset time sequence to the power manager in the preset time, the power manager stops supplying power to the plurality of electric energy receiving ends in sequence according to the preset time sequence, thereby effectively solving the problem that in the case of abnormal power failure, because many power supply circuits on the DMD can't fall the power according to the chronogenesis requirement and lead to the irregular motion of DMD thereby the easy dead pixel's of appearing problem protects the DMD and prolongs the life of DMD, guarantees the imaging quality of projector.

Further features of embodiments of the present application and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which is to be read in connection with the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the embodiments of the application.

FIG. 1 is a schematic diagram of a power down protection circuit according to some embodiments of the present application;

FIG. 2 is a schematic diagram of another power down protection circuit according to some embodiments of the present application;

FIG. 3 is a schematic diagram of a power down protection circuit according to some embodiments of the present application in the case where the load device is a DMD;

FIG. 4 is a schematic diagram of an electronic device according to some embodiments of the present application.

Detailed Description

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.

In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be discussed further in subsequent figures.

Various embodiments and examples according to the present application are described below with reference to the accompanying drawings.

Fig. 1 is a schematic diagram of a power down protection circuit according to some embodiments of the present application. As shown in fig. 1, the power down protection circuit 100 includes: a built-in power supply 101, a switch controller 102, a Microcontroller Unit (Microcontroller Unit) 103, and a power manager 104.

As shown in fig. 1, the built-in power supply 101 is electrically connected to the switch controller 102. Switch controller 102 is coupled 104 to the power manager via a micro control unit 103.

The power manager 104 is used to connect load devices. With continued reference to fig. 1, load device 105 includes a plurality of power sinks 1051, and switch controller 102 is coupled to the plurality of power sinks of load device 105 via power manager 104. The power up and power down sequences of the multiple power receiving ends of the load device 105 have strict timing requirements. The power manager 104 may control the power up sequence and the power down sequence of the multiple power receiving ends of the load device 105.

The mcu 103 can send instructions to the power manager coupler 104 such that the power manager coupler 104 performs corresponding operations according to the received instructions.

As shown in fig. 1, the switch controller 102 is further configured to connect to an external power source 106, and in a case that the switch controller 102 connects to the external power source 106 and the external power source 106 is switched from normal power supply to power off, the switch controller 102 switches a connection line between the switch controller 102 and the internal power source 101 from off to on, so that the internal power source 101 supplies power to the micro control unit 103 and the power manager 104, and the micro control unit 103 and the power manager 104 are maintained to continue to operate for a preset time.

When the connection line between the switch controller 102 and the built-in power supply 101 is turned on and an electric signal from the external power supply 106 is received, the connection line between the switch controller 102 and the built-in power supply 101 is switched on and off so that power is supplied to the load device 105 by the external power supply 106.

The switch controller 102 may be, for example, a two-way relay.

The micro control unit 103 is configured to send a shutdown instruction carrying a preset timing sequence to the power manager 104 when detecting that the external power supply 106 is powered off.

The power manager 104 is configured to, when receiving the shutdown instruction, sequentially stop power supply to the plurality of power receiving ends in the load device 105 according to a preset time sequence, so as to sequentially power down the plurality of power receiving ends according to a power down time sequence requirement of the plurality of power receiving ends in the load device 105.

In some embodiments, the voltage of the electrical signal received by different power receiving terminals may be different.

In some embodiments, the power of the built-in power supply 101 satisfies: the preset time for keeping the micro control unit 103 and the power manager 104 running is less than the preset time threshold.

In some embodiments, the preset time threshold is less than or equal to 3s, so that after the power manager 104 controls the power receiving ends in the load device 105 to stop supplying power in sequence according to the shutdown instruction from the mcu 103, the mcu 103 and the power manager 104 are not powered on any more.

It is understood that, in case of the power exhaustion of the internal power source 101, after the external power source 106 is turned on again, the external power source 106 may charge the internal power source 101 to ensure that the internal power source 101 may supply power to the micro control unit 103 and the power manager 104 again to maintain the micro control unit 103 and the power manager 104 to continue to operate for the preset time when the sudden power failure occurs next time.

In some embodiments, as shown in fig. 2, a power down protection circuit 200 is provided. Compared to the power down protection circuit 100, the power down protection circuit 200 further includes a power supply voltage conversion module 201.

The power supply voltage conversion module 201 is coupled to the micro control unit 103 for outputting a high level signal in case the switch controller 102 switches on the external power supply 106 and outputting a low level signal in case the switch controller 102 switches off the external power supply 106.

The micro control unit 103 is further configured to: in the case where it is detected that the voltage output on the power voltage conversion module 102 is converted from a high level to a low level, it is determined that the external power source is powered off. In this case, the mcu 103 sends a shutdown command carrying a preset timing to the power manager.

Of course, it is understood that the micro control unit 103 may also determine that the external power source is powered off in case it detects that its port connected to the switch controller receives an electrical signal from the external power source.

The following describes the scheme in the embodiment of the present application by taking the load device 105 as a Digital Micromirror Device (DMD) and the Power manager 104 as a Power Management Integrated Circuits (PMIC) as an example.

As shown in fig. 3, the load device is a DMD, and the plurality of power receiving terminals of the DMD includes four power receiving terminals for receiving four voltages, VDD, VRST (i.e., VRESET), VOFS (i.e., VOFFSET), and VBTAS, respectively.

As shown in fig. 3, the four power receiving terminals include a first power receiving terminal, a second power receiving terminal, a third power receiving terminal, and a fourth power receiving terminal.

The first power receiving terminal is configured to receive a first electrical signal, where a voltage of the first electrical signal is a power voltage (denoted as VDD in fig. 3).

The second power receiving terminal is configured to receive a second electrical signal, and the voltage of the second electrical signal is a reset voltage (denoted as VRESET in fig. 3).

The third power receiving terminal is configured to receive a third electrical signal, which has a deflection voltage (denoted as VOFFSET in fig. 3) for deflection by the DMD.

The fourth power receiving terminal is configured to receive a fourth electrical signal, where the voltage of the fourth electrical signal is a reference voltage (labeled VBIAS in fig. 3).

As shown in fig. 3, a transmission path between the external power supply 301 and the dual-electric relay 302 is a, a transmission path between the built-in power supply 303 and the dual-electric relay 302 through a wire b1 is b1, a transmission path between the dual-electric relay 302 and the power supply voltage conversion module 303 is c, and a transmission path between the dual-electric relay 302 and the optical motor power supply management chip 304 is b2 → d; the transmission path between the dual electric relay 302 and the micro control unit 305 is b2 → e; a transmission path between the power voltage conversion module 303 and the micro control unit 305 is f, a transmission path between the power voltage conversion module 303 and the optical transceiver power management chip 304 is g, a transmission path between the micro control unit 305 and the optical transceiver power management chip 304 is h, and each transmission path between the optical transceiver power management chip 304 and the plurality of power receiving terminals of the DMD306 is j.

When the external power supply 301 and the dual electric relay 302 are turned on, for example, when a power adapter of a projector is inserted into a power outlet, the dual electric relay 302 turns on the path a → c and turns off the path b1 → b 2. In this case, the power supply voltage conversion module 303 outputs an electrical signal of 3.3V to the micro control unit 305 through a path f.

When the external power supply 301 and the dual electric relay 302 are disconnected, for example, when the power adapter of the projector is removed from the power outlet or the power supply is suddenly stopped at the power outlet, the dual electric relay 302 turns on the path b1 → b2 and disconnects the path a → c. In this case, the built-in power supply 303 outputs the electric power to the photo-mechanical power supply management chip 304 through the path b1 → b2 → d for the photo-mechanical power supply management chip 304 to continue to operate; meanwhile, the power voltage conversion module 303 converts the output voltage from 3.3V to 0, i.e., converts the high level to the low level, to the micro control unit 305 through the path f, and after the micro control unit 305 detects the conversion from the high level to the low level, the micro control unit 305 sends a close command carrying a preset time sequence (i.e., a power-down sequence of VDD, VRST, VOFS, and VBTAS) to the optical power management chip 304 through the path h, and the optical power management chip 304 stops sequentially supplying power to the first power receiving terminal 3051, the second power receiving terminal 3052, the third power receiving terminal 3053, and the fourth power receiving terminal 3054 according to the preset time sequence.

As shown in fig. 3, the optical power management chip 304 is also electrically connected to the light emitting device 307, and the transmission path between the optical power management chip 304 and the light emitting device 307 is k.

The light-emitting device 307 may be a light-emitting device such as a light-emitting diode (LED). The light emitting device 307 is used to indicate whether the device (e.g., opto-mechanical projector) in which the DMD is located is operating. The light emitting device 307 emits light, which indicates that the electric energy on the external power supply 301 or the internal power supply 302 is output to the DMD and the light emitting device 307 through the optical motor power management chip 304, indicating that the projector is operating; the light emitting device 307 is turned off, indicating that the projector stops operating.

An advantage of the embodiments of the present application lies in that a power down protection circuit can be provided, including: the power supply comprises a built-in power supply, a switch controller, a micro control unit and a power supply manager, wherein the built-in power supply is electrically connected with the switch controller, the power supply manager is used for connecting a load device, the load device comprises a plurality of electric energy receiving ends, the switch controller is coupled with the plurality of electric energy receiving ends of the load device through the power supply manager, and the switch controller is also coupled with the power supply manager through the micro control unit; the switch controller is used for switching a connecting line between the switch controller and the built-in power supply from off to on under the condition that the external power supply is connected and the external power supply is powered off so that the built-in power supply provides electric energy for the micro control unit and the power supply manager to maintain the micro control unit and the power supply manager to continuously run for a preset time; the micro control unit is used for sending a closing instruction carrying a preset time sequence to the power supply manager under the condition of detecting the power failure of the external power supply; and the power supply manager is used for sequentially stopping power supply to the plurality of electric energy receiving ends according to a preset time sequence under the condition of receiving the closing instruction. Therefore, the embodiment of the application can realize the function of the projector, after the projector is powered on by external power, in the case of sudden power failure caused by the fact that the external power is pulled off or equipment is in failure, the micro control unit and the power manager coupled to the DMD can continue to be supplied with power through the built-in battery, so that the micro control unit and the power manager can continue to operate for a preset time, the micro control unit sends a closing instruction with preset time sequence to the power manager in the preset time, the power manager stops supplying power to the plurality of electric energy receiving ends in sequence according to the preset time sequence, thereby effectively solving the problem that in the case of abnormal power failure, because many power supply circuits on the DMD can't fall the power according to the chronogenesis requirement and lead to the irregular motion of DMD thereby the easy dead pixel's of appearing problem protects the DMD and prolongs the life of DMD, guarantees the imaging quality of projector.

It can be understood that the power down protection circuit can be applied to any load device including multiple power receiving ends, as long as the load device meets the strict timing requirements of the power-up sequence and the power-down sequence of the multiple power receiving ends.

The embodiment of the application also provides electronic equipment which comprises a load device and the power failure protection circuit in any embodiment.

FIG. 4 is a schematic structural diagram of an electronic device according to some embodiments of the present application. As shown in fig. 4, the electronic device 400 includes a load device 401 and the power down protection circuit 100.

The load device may be, for example, a DMD. In this case, the electronic device 400 may be, for example, a projector light engine.

An advantage of the embodiment of the present application lies in that an electronic device can be provided, the electronic device includes the power down protection circuit in the above embodiment, and the power down protection circuit includes: the power supply comprises a built-in power supply, a switch controller, a micro control unit and a power supply manager, wherein the built-in power supply is electrically connected with the switch controller, the power supply manager is used for connecting a load device, the load device comprises a plurality of electric energy receiving ends, the switch controller is coupled with the plurality of electric energy receiving ends of the load device through the power supply manager, and the switch controller is also coupled with the power supply manager through the micro control unit; the switch controller is used for switching a connecting line between the switch controller and the built-in power supply from off to on under the condition that the external power supply is connected and the external power supply is powered off so that the built-in power supply provides electric energy for the micro control unit and the power supply manager to maintain the micro control unit and the power supply manager to continuously run for a preset time; the micro control unit is used for sending a closing instruction carrying a preset time sequence to the power supply manager under the condition of detecting the power failure of the external power supply; and the power supply manager is used for sequentially stopping power supply to the plurality of electric energy receiving ends according to a preset time sequence under the condition of receiving the closing instruction. The electronic equipment in the embodiment of the application can protect the load device through the power-down protection circuit under the condition of sudden power failure, and the phenomenon that the normal operation condition of the electronic equipment is influenced after the load device is damaged due to sudden power failure is effectively avoided.

In the case that the electronic device is a projector engine, the embodiment of the application can be used for supplying power to the projector after the projector is powered on, in the case of a sudden power failure, for example, due to the external power being unplugged or the device failing, the micro control unit and the power manager coupled to the DMD can continue to be supplied with power through the built-in battery, so that the micro control unit and the power manager can continue to operate for a preset time, the micro control unit sends a closing instruction with preset time sequence to the power manager in the preset time, the power manager stops supplying power to the plurality of electric energy receiving ends in sequence according to the preset time sequence, thereby effectively solving the problem that in the case of abnormal power failure, because many power supply circuits on the DMD can't fall the power according to the chronogenesis requirement and lead to the irregular motion of DMD thereby the easy dead pixel's of appearing problem protects the DMD and prolongs the life of DMD, guarantees the imaging quality of projector.

Having described embodiments of the present application, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein. The scope of the application is defined by the appended claims.

Claims (8)

1. A power down protection circuit, comprising: the power supply comprises a built-in power supply, a switch controller, a micro control unit and a power manager, wherein the built-in power supply is electrically connected with the switch controller, the power manager is used for connecting a load device, the load device comprises a plurality of electric energy receiving ends, the switch controller is coupled with the plurality of electric energy receiving ends of the load device through the power manager, and the switch controller is further coupled with the power manager through the micro control unit;

the switch controller is used for switching a connecting line between the switch controller and the built-in power supply from off to on under the condition that an external power supply is connected and the external power supply is powered off, so that the built-in power supply provides electric energy for the micro control unit and the power supply manager to maintain the micro control unit and the power supply manager to continuously run for a preset time;

the micro control unit is used for sending a closing instruction carrying a preset time sequence to the power supply manager under the condition of detecting the power failure of the external power supply;

and the power supply manager is used for sequentially stopping power supply to the plurality of electric energy receiving ends according to the preset time sequence under the condition of receiving the closing instruction.

2. The power-down protection circuit of claim 1, further comprising a power supply voltage conversion module coupled to the micro control unit, the power supply voltage conversion module configured to output a high level signal if the switch controller turns on an external power supply and to output a low level signal if the switch controller turns off the external power supply;

the micro control unit is further configured to: and determining that the external power supply is powered off under the condition that the voltage output by the power supply voltage conversion module is converted from a high level to a low level.

3. The power down protection circuit of claim 1, wherein the switch controller is further configured to: and switching a connection line between the switch controller and the internal power supply from on to off when the connection line is turned on and the connection line receives an electric signal from the external power supply.

4. The power down protection circuit of claim 1, wherein the switch controller is a two-way relay.

5. The power-fail protection circuit of claim 1, wherein the power of the internal power supply satisfies the following conditions: and maintaining the preset time for the micro control unit and the power manager to continuously run to be less than a preset time threshold.

6. The power down protection circuit of claim 5, wherein the preset time threshold is less than or equal to 3 s.

7. An electronic device comprising a load device and the power down protection circuit of any of claims 1-6, the load device comprising a plurality of power receiving terminals, the power down protection circuit for coupling with the plurality of power receiving terminals of the load device.

8. The electronic device of claim 7, wherein the load device is a digital micromirror device.

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