CN107426619B

CN107426619B - Intelligent television and undervoltage protection fault-tolerant method thereof

Info

Publication number: CN107426619B
Application number: CN201710432053.4A
Authority: CN
Inventors: 孙聪; 黄飞; 李见
Original assignee: Qingdao Hisense Electronics Co Ltd
Current assignee: Hisense Visual Technology Co Ltd
Priority date: 2017-01-26
Filing date: 2017-06-09
Publication date: 2019-12-06
Anticipated expiration: 2037-06-09
Also published as: CN107426617A; CN107197380A; CN107426619A; CN107426618A; CN107426618B; CN107426617B; CN107197380B

Abstract

An intelligent television and an undervoltage protection fault-tolerant method thereof are provided, the intelligent television comprises: the power supply comprises a power supply, a main processor, a storage device, a reset system and a voltage detection circuit, wherein the main processor, the storage device and the reset system are powered by the power supply; further comprising: the voltage comparison unit comprises a primary voltage comparison circuit, a first voltage comparison circuit and a second voltage comparison circuit, wherein the primary voltage comparison circuit is used for comparing the power supply voltage with a set voltage threshold value, judging whether the power supply voltage is increased to a voltage for triggering and controlling the storage equipment to stop working or not, and correspondingly providing a first trigger signal; and the decision unit is used for deciding whether to control the storage equipment to work again or not according to the detection signal provided by the voltage detection circuit and at least one trigger signal provided by the voltage comparison unit. After entering the power failure protection mode, the invention can recover automatically, thereby improving the user experience.

Description

Intelligent television and undervoltage protection fault-tolerant method thereof

Technical Field

The invention relates to an intelligent television, in particular to an intelligent television with an EMMC.

Background

In the development of the current smart televisions, many smart televisions are provided with an EMMC (Embedded Multi Media Card), the EMMC is used for storing program codes and other data of a main CPU of the smart television, and data in the EMMC is important for normal operation of the smart television.

Fig. 1 shows a power-down protection block diagram of an EMMC in the prior art, which includes a power supply, a motherboard power conversion system, a detection circuit, a memory system, an SOC (system on chip), an EMMC system, and a RESET system (RESET system).

Fig. 2 is a block diagram of the power supply of fig. 1, which includes a rectifier filter circuit, a PFC circuit, an LLC resonant circuit, a first transformer, a first feedback circuit, a flyback circuit, a second transformer, and a second feedback circuit.

As shown in fig. 3, the conventional detection circuit applied to the EMMC undervoltage protection mechanism is configured such that a 12V voltage is grounded via resistors R104, R113, and R123, a detection signal Power _ Detect is a detection signal of a main CPU of the SOC, the detection signal is a voltage across the resistor R123, and a level of the detection signal is 1V when the Power supply is normally powered. Because the Power panel and the mainboard have capacitors, when the alternating current 220V is powered off, the output 12V does not immediately decrease but gradually decreases, and when the 12V is powered off to 10V, the detection signal Power _ Detect falls from 1V to 0.8V, namely, the Power-off protection of the EMMC is triggered.

The power-down protection is triggered before the SOC main CPU stops working, the main CPU can still maintain normal working for a period of time, and during the period, the main CPU can store data in the EMMC and control the EMMC to stop working so as to ensure that the data in the EMMC cannot be changed or damaged.

If the input alternating current is continuously reduced, the intelligent television is shut down, and the CPU of the SOC stops working; if the power is lost instantly, the ac power supply is recovered to normal before the CPU stops working, the smart television is still in a power-down protection state, and at this time, hardware circuits such as a demodulator, a video decoder, an audio D/a converter, and the like can still work, that is, video pictures and sounds can be played normally, but input devices, such as keys and remote controls, cannot respond, and are in a dead halt state.

As shown in fig. 4, is a partial block diagram of a typical smart tv, including a main CPU, a demodulator, a video decoder, an audio D/a converter, an input device, and an EMMC. When the digital television normally works, the main CPU is used for controlling the demodulator, the video decoder and the audio D/A converter according to related instructions input by the input equipment, and when the demodulator, the video decoder and the audio D/A converter work, the digital television can work without obtaining the instructions of the main CPU, so that whether the CPU works at the moment does not influence the normal operation of the hardware.

As can be seen, the power failure protection mode adopted by the existing smart television for the EMMC is a conventional mode, and the situation of autonomous recovery is not considered. Once the power supply is triggered in a power failure mode, the system enters a protection state and cannot be automatically reset and started; in addition, under the condition that the user manually operates quickly, the user can enter a protection state occasionally; especially voltage drops caused by household power failure and accidental surges. These adversely affect the user experience.

Disclosure of Invention

The technical problem to be solved by the invention is to overcome the defects in the prior art, and provide a smart television which can automatically recover after entering a power failure protection mode, so that the user experience is improved.

The technical solution proposed by the present invention for solving the above technical problems includes that a smart tv is proposed, which includes: the power supply comprises a power supply, a main processor, a storage device, a reset system and a voltage detection circuit, wherein the main processor, the storage device and the reset system are powered by the power supply; further comprising: the voltage comparison unit comprises a primary voltage comparison circuit, a first voltage comparison circuit and a second voltage comparison circuit, wherein the primary voltage comparison circuit is used for comparing the power supply voltage with a set voltage threshold value, judging whether the power supply voltage is increased to a voltage for triggering and controlling the storage equipment to stop working or not, and correspondingly providing a first trigger signal; and the decision unit is used for deciding whether to control the storage equipment to work again or not according to the detection signal provided by the voltage detection circuit and at least one trigger signal provided by the voltage comparison unit.

The technical scheme provided by the invention aiming at the technical problems also comprises that an undervoltage protection fault-tolerant method of the intelligent television is provided, and a voltage detection circuit, a voltage comparison unit and a decision unit are matched; the voltage detection circuit is used for detecting whether the power supply voltage of the storage device of the intelligent television is reduced or not and triggering and controlling the storage device to stop working; the voltage comparison unit comprises a primary voltage comparison circuit, a first voltage comparison circuit and a second voltage comparison circuit, wherein the primary voltage comparison circuit is used for comparing a power supply voltage with a set voltage threshold value, judging whether the power supply voltage is increased to a voltage for triggering and controlling the storage equipment to stop working or not, and correspondingly providing a first trigger signal; the decision unit is used for deciding whether to control the storage device to work again or not according to the detection signal provided by the step of detecting the power supply voltage of the storage device and at least one trigger signal provided by the voltage comparison unit.

Compared with the prior art, the method and the device have the advantages that the voltage detection circuit, the voltage comparison unit and the decision unit are matched, whether the power supply voltage is reduced or not is judged, the storage device is triggered and controlled to stop working or not, whether the power supply voltage is increased to the voltage before the storage device is triggered and controlled to stop working or not is judged after the storage device is triggered and controlled to stop working or not is judged, if yes, the storage device is controlled to work again, and after the power failure protection mode is entered, the power failure protection mode can be recovered automatically, so that user experience is improved.

Drawings

Fig. 1 illustrates a system for under-voltage protection EMMC of a smart tv.

Fig. 2 illustrates a power supply system of a smart tv in existence.

Fig. 3 illustrates a detection circuit for an EMMC supply voltage of a smart tv.

Fig. 4 illustrates a system of a smart tv that is present.

Fig. 5 illustrates a system of a first embodiment of the smart tv of the present invention.

Fig. 6 illustrates an autonomous recovery method employed in the first embodiment.

Fig. 7 illustrates a voltage comparison circuit employed in the first embodiment.

Fig. 8 illustrates the situation of the supply voltage under-voltage faced by the first embodiment.

Fig. 9 illustrates the situation faced by the first embodiment where the interference pulse occurs in the supply voltage under normal shutdown.

Fig. 10 illustrates a current comparison circuit employed in the first embodiment.

Fig. 11 illustrates a current detection portion of another current comparison circuit employed in the first embodiment.

Fig. 12 illustrates a voltage comparison portion of another current comparison circuit employed in the first embodiment.

Fig. 13 illustrates a decision circuit employed in the first embodiment.

Fig. 14 illustrates an SOC and a memory device employed in the first embodiment.

Fig. 15 illustrates the matching relationship of the decision levels employed in the first embodiment with the clock circuit and the IO interface circuit in the memory device controller.

Fig. 16 illustrates another SOC and memory device employed in the first embodiment.

Fig. 17 illustrates an operation principle of the protection mechanism with autonomous recovery function of the first embodiment.

Fig. 18 illustrates a system of a second embodiment of the smart tv of the present invention.

Fig. 19 shows a one-stage voltage comparison circuit employed in the second embodiment.

Fig. 20 illustrates another one-stage voltage comparison circuit employed in the second embodiment.

Fig. 21 shows a further one-stage voltage comparison circuit employed in the second embodiment.

Fig. 22 shows a further one-stage voltage comparison circuit employed in the second embodiment.

Fig. 23 illustrates a two-stage voltage comparison circuit employed in the second embodiment.

Fig. 24 illustrates a decision circuit employed in the second embodiment.

Fig. 25 illustrates the operation principle of the protection mechanism with autonomous recovery function of the second embodiment.

Wherein the main reference numerals are as follows: 100a, 100 power supply 102 voltage comparison 103 current comparison 104 main board power conversion system 105 memory 106SOC 107 storage device 108RESET system 109 detection circuit 110 decision circuit 102a primary voltage comparison 103a secondary voltage comparison.

Detailed Description

The present invention will be further explained in detail with reference to the accompanying drawings.

Referring to fig. 5, fig. 5 illustrates a system of a first embodiment of the smart tv of the present invention. The present invention provides a smart tv 100, which includes: a power supply 101, a voltage comparison 102, a current comparison 103, a motherboard power conversion system 104, a memory 105, an SOC106, a storage device 107, a RESET (RESET system) 108, a detection circuit 109, and a decision circuit 110.

The power supply 101 provides a 12V supply. The voltage comparison 102 monitors the 12V provided by the power supply 101. The current comparison 103 monitors the 12V current supply provided by the power supply 101. The main board power conversion system 104 supplies various voltages required for normal operation of the main board for 12V conversion provided by the power supply 101, so that the memory 105, the SOC106, the storage device 107, and the RESET system 108 on the main board can operate normally. The detection circuit 109 monitors whether the power supply 101 is powered down, and provides a detection signal to the SOC106 in time. The decision circuit 110 generates a decision level according to the signal VD given by the voltage comparison 102, the signal Vef given by the current comparison 103, and the detection signal given by the detection circuit 109, thereby controlling the operation of the RESET system 108.

Referring to fig. 6, fig. 6 illustrates an autonomous recovery method employed by the first embodiment. The invention provides a method for autonomously recovering the work of storage equipment by an intelligent television, which comprises the following steps.

S100, detecting the power supply voltage of the storage device.

The memory device referred to herein may be an EMMC, Flash memory, or the like.

The power supply voltage referred to herein may be a voltage at the power input port of the memory device or a voltage preceding the voltage. The following description is made with reference to fig. 2, 3, and 5. The voltage of the power supply input port of the storage device EMMC is the voltage output by the mainboard power supply conversion system, and the power supply voltage of the EMMC can be the voltage output by the mainboard power supply conversion system; or the voltage of the front stage of the voltage output by the mainboard power supply conversion system, namely 12V output by the power supply; the voltage regulator can also be the output voltage of a flyback circuit, a PFC circuit or a rectification filter circuit.

It should be noted that although the detection signal Power _ Detect is obtained by a circuit formed by the resistors R123, R113, R104, R105, and R118, since a change in the supply voltage 12V causes a change in the detection signal Power _ Detect, it can be understood that: the Power _ Detect signal is obtained as a detection of the supply voltage.

S110, judging whether the power supply voltage is reduced and triggering the storage device to stop working, judging whether the power supply voltage is increased to the voltage before triggering the storage device to stop working after triggering the storage device to stop working, and controlling the storage device to work again if the power supply voltage is increased to the voltage before triggering the storage device to stop working.

After the storage device is re-operational, the main CPU may read the program code and associated data from the storage device so that operation may continue.

Referring to fig. 3, when the supply voltage 12V is reduced to 10V, the detection signal Power _ Detect falls from 1V to 0.8V, which triggers the control of the storage device to stop working.

In order to determine whether the supply voltage rises to the voltage before triggering the memory device to stop operating after triggering the memory device to stop operating, in this embodiment, a voltage comparison 102 is added, see fig. 5. Consider that: with only the voltage comparison (circuit) 102 described above, false recognition may occur in some cases, and in order to further confirm whether the power supply voltage is restored to the voltage at the time of normal operation, a current comparison 103 is added.

Referring to fig. 7, fig. 7 illustrates a voltage comparison circuit employed in the first embodiment. Specifically, the magnitude of the supply voltage Vin1 during normal operation may be determined: the voltage comparison result VD is output by referring to the supply voltage Vref1 (e.g., 12V), taking the supply voltage Vin1 and the reference supply voltage Vref1 as two inputs of a voltage comparator (or other voltage comparison circuit such as an OVP undervoltage protection circuit). When the supply voltage Vin1 is greater than the reference supply voltage Vref1, outputting a voltage comparison result VD; when the supply voltage Vin1 is less than the reference supply voltage Vref1, another voltage comparison result VD is output.

After triggering and controlling the storage device to stop working, when the power supply voltage Vin1 is greater than the reference power supply voltage Vref1, it indicates that the power supply voltage recovers to rise, and can be determined according to the voltage comparison result VD; when the supply voltage Vin1 is still less than the reference supply voltage Vref1, it indicates that the supply voltage has been completely powered down (e.g., 0V), and it can also be determined according to the voltage comparison result VD.

Referring to fig. 8, fig. 8 illustrates the situation of the supply voltage under-voltage faced by the first embodiment. At time T1, the supply voltage Vin momentarily drops and drops below the protection threshold (set voltage threshold) V1, so that at time T1 the drop in the supply voltage Vin triggers the control of the memory device to stop operating. At this time, although Vin1 is also smaller than Vref1, since the voltage comparator is triggered by the rising edge, the voltage comparator can only output the voltage comparison result VD when the power supply voltage recovers to Vref1 at time T2, and it is determined according to the comparison result VD that the power supply voltage Vin1 recovers to the voltage before triggering the storage device to stop operating. Therefore, the voltage comparator does not output the comparison result of Vin1 being less than Vref1 after the time T1 and before the time T2.

Referring to fig. 9, fig. 9 illustrates a situation faced by the first embodiment where the interference pulse occurs in the supply voltage under normal shutdown. For example, when the user normally shuts down the smart tv (i.e., shutdown is performed by using a remote controller or a switch on the smart tv, except for a mode of directly cutting off a power supply (e.g., unplugging a plug, and turning off a main switch)), the main CPU may first enter the standby state T3, and at this time, the main CPU is not powered down, and if a disturbance rising pulse T4 occurs in the power supply at this time, that is, the power supply voltage meets a situation that the power supply voltage first falls and then rises, according to the method of the foregoing embodiment, the storage device is controlled to restart to operate, and the main CPU is still in the standby state at this time, so that the main CPU reads data of the storage device again and restarts to operate, which may cause a shutdown failure of the user, thereby affecting user experience.

Referring to fig. 5, the current comparison 103 is used to detect whether the associated current of the memory device is continuous, if so, it indicates that the user is performing the power-on action, and if not, it indicates that the user is performing the power-off action.

The associated current here refers to the current at any position of the circuit system where the storage device is located, and the associated current reflects the operation state of the machine where the storage device is located, for example: when the power supply runs, the associated current is not zero, and the associated current can be the current of a main board power supply conversion system, or the current of a flyback circuit, a PFC circuit or a rectification filter circuit.

The current comparison 103 may output a current comparison result Vef, and when the current is detected to be continuous, output a current comparison result Vef, according to which it may be determined that the current is continuous, and when the current is detected to be discontinuous, output another current comparison result Vef, according to which it may be determined that the current is discontinuous.

Referring to fig. 10, fig. 10 illustrates a current comparison circuit employed in the first embodiment. The current comparison (circuit) 103 is implemented by using a voltage comparator and a sampling capacitor. A reference voltage Vref2 (which may be variable) may be set, if the current I1 continues, the voltage Vin2 of the sampling capacitor C1 increases, and after a certain time, the current comparison result Vef may reflect the magnitude between the voltage Vin2 and the reference voltage Vref 2. If the voltage Vin2 is greater than the reference voltage Vref2, it indicates that the current I is constant.

In other embodiments, for some tank circuits with capacitors, when the power is turned on, the current supplied by the tank circuit to the outside is reduced; when the power supply is shut down, the current supplied by the energy storage circuit to the outside is increased. Therefore, by detecting an increase in the magnitude of the current supplied from such a tank to the outside (e.g., a sample load), it is also possible to determine whether the user is powering off or on.

Referring to fig. 11 and 12, fig. 11 illustrates a current detection portion of another current comparison circuit employed in the first embodiment. Fig. 12 illustrates a voltage comparison portion of another current comparison circuit employed in the first embodiment. The energy storage capacitor C2 in the energy storage circuit and the sampling resistor Rs form a current trap, wherein the current I2 represents the current supplied by the energy storage circuit to the outside, i.e., the current flowing through the sampling resistor Rs. A reference voltage Vref3 (which may be variable) may be set, if the current I2 continues, the voltage Vin3 of the sampling capacitor C1 increases, and after a certain time, the current comparison result Vef may reflect the magnitude between the voltage Vin3 and the reference voltage Vref 3. If the voltage Vin3 is greater than the reference voltage Vref3, it indicates that the current I2 is increased, otherwise, it indicates that the current I2 is not increased.

Referring to fig. 13, fig. 13 illustrates a decision circuit employed in the first embodiment. The decision circuit 110 is implemented by an and gate, and can obtain a decision level according to the detection signal Power _ Detect, the voltage comparison result VD, and the current comparison result Vef. The logic of decision circuit 110 is as follows.

Power_Detect	VD	Vef	Decision level
				1	1	1	0
0	0	0	0
				0	1	1	1

The logic relation between the decision level and the detection signal Power _ Detect, the voltage comparison result VD and the current comparison result Vef is as follows: decision level (/ Power _ Detect) and (vd) and (vef).

Referring to fig. 3 in combination, in normal operation, the detection signal Power _ Detect is a high level 1; when the power supply voltage fluctuates and drops to trigger the storage equipment to stop working; the detection signal Power _ Detect is low level 0; when the supply voltage is completely reduced to 0V, the detection signal Power _ Detect is also low level 0.

Referring to fig. 5 and 7 in combination, when operating normally, the voltage comparison result VD is a high level 1; after triggering the storage device to stop working, when the power supply voltage Vin1 is greater than the reference power supply voltage Vref1, the voltage comparison result VD is high level 1; after triggering the memory device to stop working, when the supply voltage Vin1 is still less than the reference supply voltage Vref1, the voltage comparison result VD is low level 0.

Referring to fig. 5 and fig. 10 to 12 in combination, when operating normally, or in the case where the supply voltage drops but the current is continuous, the current comparison result Vef is a high level 1, and when the supply voltage stops supplying power completely, the current comparison result Vef is a low level 0.

Referring to the above table, when the detection signal Power _ Detect, the voltage comparison result VD, and the current comparison result Vef are all high level 1, it indicates that the storage device is normally powered, and thus there is no need to control the storage device to stop working, for example: the decision level is low level 0; when the detection signal Power _ Detect, the voltage comparison result VD and the current comparison result Iref are all low level 0, it indicates that the Power supply voltage of the storage device is reduced to 0, i.e. no Power is supplied, and therefore it is not necessary to control the storage device to stop working, for example: the decision level is low level 0; when the detection signal Power _ Detect is at low level 0 and the voltage comparison result VD and the current comparison result Vef are both at high level 1, indicating that the Power supply voltage is resumed after the fluctuation drops, at this time, the storage device needs to be controlled to resume operation because the storage device is in a stop operation state, for example: the decision level is high level 1.

After the decision level is obtained, whether the memory device needs to be controlled to work again or not can be realized according to the decision level. There are a number of ways to control the storage device to resume operation.

Referring to fig. 14, fig. 14 illustrates an SOC and a memory device employed in the first embodiment. In one approach, the operation and non-operation of the storage device may be controlled by controlling the operation and non-operation of a storage device controller. The SOC includes a main CPU and a first storage device controller, and the storage device includes a second storage device controller and a storage medium.

In the storage device, the storage medium stores program code executed by the main CPU, and related data. The clock circuit is used for providing a clock signal required by the operation for the storage device controller. The IO interface circuit is used for providing a data interface for communication between the main second storage device controller and the first storage device controller and a data interface between the second storage device controller and the storage medium. The processor is used for controlling the clock circuit and the IO interface circuit. The first storage device controller is identical in structure to the second storage device controller.

The SOC communicates with the second storage device controller through its own first storage device controller. When the SOC stores data to the storage device, the first storage device controller sends the data to the second storage device controller, and the second storage device controller stores the received data in a storage medium; when the SOC reads data from the storage device, the second storage device controller reads the data from the storage medium and then transmits the data to the first storage device controller.

It can be understood that the storage device controller is a channel for the SOC to read and write data to the storage device, and therefore, when the storage device needs to be controlled to stop working, the first storage device controller may be controlled to stop working (or, the first storage device controller is turned off), and when the second storage device controller of the storage device does not receive a signal from the first storage device controller, the storage device controller naturally also stops working.

For example, the main CPU sends a command for turning off the clock circuit to the processor of the first storage device controller, so that the first storage device controller stops working, and the processor of the first storage device controller is also turned off due to the absence of the clock signal generated by the clock circuit, and thereafter, the first storage device controller cannot receive a command from the main CPU, and cannot work again unless the first storage device controller is reset; or the main CPU sends a command to the first storage device controller to close the IO interface circuit, the first storage device controller cannot receive the command from the main CPU any more, and cannot send data to the second storage device controller, and unless the first storage device controller is reset, the first storage device controller cannot work again.

Referring to fig. 15, fig. 15 illustrates the matching relationship of the decision levels employed in the first embodiment with the clock circuit and the IO interface circuit in the memory device controller. In one approach, a schematic diagram of the connection of decision levels to clock circuits and IO interface circuits in a memory device controller. Wherein Reset represents Reset ports of the clock circuit and the IO interface circuit, and high level is active. When the decision level is high level, the clock circuit and the IO interface circuit are reset and resume their operation, i.e., the memory device controller and the memory device resume their operation.

There may also be the following method of controlling the storage device to resume operation: sending a shutdown command to the storage device, and shutting down the storage device after receiving the shutdown command (when the storage device needs to work again, the decision level may be used to reset the storage device), for example, sending the shutdown command to shut down a clock circuit, an IO interface circuit, and the like of the storage device.

Referring to fig. 16, fig. 16 illustrates another SOC and memory device employed in the first embodiment. The SOC includes a main CPU and a first EMMC Controller (EMMC Controller), the EMMC including a second EMMC Controller and a storage medium. Data interaction of the SOC with the EMMC may be as previously described with respect to FIG. 14.

In particular, the decision level may be used to reset the first memory device controller. For example: the decision level is connected to a reset circuit of the first memory device controller. When the decision level is low level 0, the reset circuit does not work, and when the decision level is high level 1, the reset circuit works, the first storage device controller is reset, and the first storage device controller is electrified to work again. In this embodiment, the decision circuit 110 implemented by hardware obtains the decision level, and controls the first storage device controller to reset according to the decision level, so as to control the storage device to work again, which is faster and more reliable. In other embodiments, the logic implemented by the decision circuit 110 described above may be implemented by software running on the main CPU, or by software running on the processor of the first storage device controller, such as: the processor acquires the detection signal Power _ Detect, and controls the storage device to stop working when the detection signal Power _ Detect is at a low level, for example, to turn off a clock circuit or an IO interface circuit of the storage device.

Referring to fig. 17, fig. 17 illustrates the operation principle of the protection mechanism with autonomous recovery function of the first embodiment. It is understood that 220V power supply network 501, 12V power supply network 502, DETECT network 503, DETECT signal 504, SOC detection 505, EMMC protection bit determination 506, EMMC protection 507, and EMMC non-protection 508 are all implementation elements of the existing EMMC power down mechanism. The voltage comparison 511, the VD trigger signal 512, the current comparison 513, the Vef trigger signal 514, the spontaneous decision system judgment 515, the RESET trigger 516 and the RESET non-trigger 517 all belong to the realization elements of the newly added undervoltage protection fault-tolerant mechanism of the present invention.

It should be noted that, referring to fig. 5, the voltage comparison 102 and the current comparison 103 can be collectively understood as a voltage comparison unit for determining whether the power supply voltage is increased to a voltage between the trigger control and the stop of the operation of the memory device after the trigger control and the stop of the operation of the memory device. The logic operation implemented by the decision circuit 110 may be implemented by a program running on the main processor, and therefore, the implementation mechanism of such logic operation may be collectively referred to as a decision unit.

According to the smart television 100, on one hand, EMMC power-down protection can be realized, and controllability can be realized in a technical angle; on the other hand, fluctuation detection of the power supply is realized by introducing an under-voltage comparison mode of the power supply system, pre-judgment of the power utilization environment is carried out according to the fluctuation detection, and further, the user behavior is detected by introducing current increase detection, so that the pre-judgment of the user intention can be reliably realized, the system reset starting is realized by combining the pre-judgment result, the problem that the system cannot be started spontaneously due to power failure protection of the EMMC can be effectively solved, and the user experience is greatly improved.

Referring to fig. 18, fig. 18 illustrates a system of a second embodiment of the smart tv of the present invention. The present invention provides a smart tv 100a, which includes: a power supply 101, a primary voltage comparison 102a, a secondary voltage comparison 103a, a motherboard power conversion system 104, a memory 105, an SOC106, a storage device 107, a RESET (RESET system) 108, a detection circuit 109, and a decision circuit 110. Compared with the smart tv 100 of the foregoing first embodiment, the difference between the two embodiments is mainly reflected in: the combination of the one-stage voltage comparison 102 and the one-stage current comparison 103 is replaced by a combination of two-stage voltage comparisons 102a, 103 a. That is, the two-stage voltage comparison 102a, 103a is used to detect whether the power supply network is recovered or not, and to provide the trigger signal required for the user to decide whether the user wants to shut down the power supply directly or whether the power consumption environment of the user is unstable or not.

Referring to fig. 19 to 22, fig. 19 illustrates a one-stage voltage comparison circuit employed in the second embodiment. Fig. 20 illustrates another one-stage voltage comparison circuit employed in the second embodiment. Fig. 19 and 20 show the case of two simple comparator circuits. The simple comparator compares the input voltage V1 with the threshold voltage Vref, and determines the output high-low level according to the magnitude, and the output high-low level serves as the trigger signal VD1 for subsequent determination. Fig. 19 and 20 show two forms of in-phase and anti-phase, respectively.

Referring to fig. 21, fig. 21 illustrates yet another one-stage voltage comparison circuit employed in the second embodiment. Fig. 21 shows a case of a hysteresis comparator. Compared with a simple comparator, the simple comparator has a simple structure and high sensitivity, but has poor anti-interference capability, if the input voltage V1 continuously jumps near the threshold voltage Vref, the output voltage VD1 fluctuates back and forth between high and low levels, and the hysteresis comparator can better solve the anti-interference problem.

Referring to fig. 22, fig. 22 illustrates a further one-stage voltage comparison circuit employed in the second embodiment. Fig. 22 shows a case of a double-limit comparator. That is, the input voltage V may be compared with two different threshold voltages Va and Vb to obtain the comparison result VD 1.

It should be noted that although the above four ways can be applied to the implementation of the first-level voltage comparison 102a, considering that only one threshold voltage can meet the design requirement, it is not necessary to select a double-limit comparator; considering that in a common household electricity environment, the voltage rarely fluctuates continuously, and the significance of selecting the hysteresis comparator is not great; considering the low cost and high efficiency of the simple comparator, the implementation of the first-stage voltage comparison 102a is implemented by the simple comparator, and this structure is consistent with the implementation structure of the voltage comparison 102 in the first embodiment.

Referring to fig. 23, fig. 23 illustrates a two-stage voltage comparison circuit employed in the second embodiment. Fig. 23 shows a situation of an under-voltage protection circuit, and the specific principle thereof is roughly as follows: when the input voltage V1 is a normal value (generally 12V), the signal VD1 is at a high level, the voltage regulator tube ZD breaks down, the triode is conducted, the coil of the relay is electrified to work, the controlled switch of the relay is closed, the signal VD2 is also at a high level, and the whole system works normally; when the input voltage V1 is lower than the threshold voltage (generally 10V), the signal VD1 becomes low level, the voltage regulator tube ZD is cut off, the triode is cut off, the coil of the relay loses power and does not work, the controlled switch of the relay is disconnected, the signal VD2 is low level, and the whole system does not work.

Referring to fig. 24, fig. 24 illustrates a decision circuit employed in the second embodiment. Compared with the decision circuit in the first embodiment, the two are identical, and the logic for deriving the decision level is the same, and it is only necessary to simply replace the two trigger signals VD, Vef with the two trigger signals VD1, VD2, respectively. And will not be described in detail herein.

Referring to fig. 25, fig. 25 illustrates the operation principle of the protection mechanism with autonomous recovery function of the second embodiment. It is understood that 220V power supply network 501, 12V power supply network 502, DETECT network 503, DETECT signal 504, SOC detection 505, EMMC protection bit determination 506, EMMC protection 507, and EMMC non-protection 508 are all implementation elements of the existing EMMC power down mechanism. The primary voltage comparison network 511a, the VD1 trigger signal 512a, the secondary voltage comparison network 513a, the VD2 trigger signal 514a, the spontaneous decision system judgment 515, the RESET trigger 516 and the RESET non-trigger 517 all belong to the implementation elements of the newly-added undervoltage protection fault-tolerant mechanism.

Compared with the case of the first embodiment shown in fig. 17, only the four elements of the primary voltage comparison network 511a, the VD1 trigger signal 512a, the secondary voltage comparison network 513a and the VD2 trigger signal 514a are different. Specifically, consider: the two elements of the primary voltage comparison network 511a and the VD1 trigger signal 512a are substantially identical to the two elements of the voltage comparison 511 and the VD trigger signal 512. Thus, the second embodiment differs from the first embodiment only by: the two elements of the secondary voltage comparison network 513a and VD2 trigger signal 514a are different from the two elements of the current comparison 513 and Vef trigger signal 514.

Referring back to fig. 18 and 5, it can be appreciated that: the second embodiment differs from the first embodiment in that: current comparison 103 is replaced with a secondary voltage comparison 103 a. It is worth mentioning that in the second embodiment, the decision levels are provided to both the RESET system 108 and the power supply 101, taking into account: the decision level is used to solve the undervoltage protection problem, and the undervoltage protection mechanism can be implemented on the motherboard or on the power supply 101. The decision level is fed back to the RESET system 108 and the power supply 101, so that the flexible realization of an under-voltage protection mechanism can be facilitated. Also for the case of the first embodiment shown in fig. 5, the decision level can be directed to the supply 101 as required by the actual application.

It should be noted that, referring to fig. 18, the primary voltage comparison 102a and the secondary voltage comparison 103a can be collectively understood as a voltage comparison unit for determining whether the power supply voltage is increased to a voltage between the trigger control and the stop of the operation of the memory device after the trigger control and the stop of the operation of the memory device. In addition, similar to the first embodiment, the logic operation implemented by the decision circuit 110 may be implemented by a program running on the main processor, and therefore, the implementation mechanism of such logic operation may be collectively referred to as a decision unit.

The smart television 100a of the invention can realize EMMC power-down protection and can be controlled in technical angle on one hand; on the other hand, the fluctuation detection of the power supply is realized by introducing a two-stage power supply system under-voltage comparison mode, and the pre-judgment of the power utilization environment is carried out according to the fluctuation detection, so that the pre-judgment of the intention of the user can be reliably realized, the reset starting of the system is realized by combining the pre-judgment result, the problem that the EMMC cannot be started spontaneously due to power failure protection can be effectively solved, and the user experience is greatly improved.

It should be noted that, in the above embodiment, the smart tv 100 has the primary voltage comparing circuit 102 and the primary current comparing circuit 103, and the smart tv 100a has the primary voltage comparing circuit 102a and the secondary voltage comparing circuit 103 a; in other embodiments, the smart tv 100, 100a may only retain the primary voltage comparing circuit 102, 102a and omit the primary current comparing circuit 103/secondary voltage comparing circuit 103a according to the requirement of practical application. In addition, the smart tv 100, 100a may be a product without a power switch or a product with a power switch according to the requirement of practical application.

The above-mentioned embodiments are merely preferred examples of the present invention, and not intended to limit the present invention, and those skilled in the art can easily make various changes and modifications according to the main concept and spirit of the present invention, so that the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. An intelligent television comprising: the power supply comprises a power supply, a main processor, a storage device, a reset system and a voltage detection circuit, wherein the main processor, the storage device and the reset system are powered by the power supply; it is characterized by also comprising: the voltage comparison unit comprises a primary voltage comparison circuit, a first voltage comparison circuit and a second voltage comparison circuit, wherein the primary voltage comparison circuit is used for comparing the power supply voltage with a set voltage threshold value, judging whether the power supply voltage is increased to a voltage before triggering and controlling the storage equipment to stop working or not, and correspondingly providing a first trigger signal; the decision unit is used for deciding whether to control the storage equipment to work again or not according to the detection signal provided by the voltage detection circuit and at least one trigger signal provided by the voltage comparison unit;

The voltage comparison unit further includes: and the primary current comparison circuit is used for detecting the associated current of the storage device, judging whether the associated current lasts or not and correspondingly providing a second trigger signal.

2. The smart tv of claim 1, wherein the current comparing circuit comprises a current detecting part for converting the detected associated current into a voltage signal; and a voltage comparison part for comparing the voltage signal provided by the current detection part with a set voltage threshold value to obtain the second trigger signal.

3. The smart television of claim 1, wherein the voltage comparing unit further comprises: and the secondary voltage comparison circuit is used for comparing the power supply voltage with a set voltage threshold value, judging whether the power supply voltage is increased to a voltage before triggering and controlling the storage equipment to stop working, and correspondingly providing a second trigger signal.

4. The smart television as claimed in claim 3, wherein the primary voltage comparison circuit is mainly composed of a voltage comparator, and the secondary voltage comparison circuit is mainly composed of a voltage regulator tube, a triode and a relay, wherein a negative electrode of the voltage regulator tube is connected with the first trigger signal.

5. The smart tv of claim 1, wherein the detection signal and the trigger signal are both level signals; the decision unit performs logic operation on the detection signal and the trigger signal to provide a decision level to the power supply and/or the reset system.

6. The smart tv of claim 5, wherein the decision unit is implemented by a logic circuit; alternatively, the decision unit is implemented by a program running on the main processor.

7. The smart television of any one of claims 1 to 6, wherein the storage device is an embedded multimedia card; the intelligent television comprises a system on chip, and the main processor is located on the system on chip.

8. An under-voltage protection fault-tolerant method of an intelligent television is characterized in that a voltage detection circuit, a voltage comparison unit and a decision unit are matched; the voltage detection circuit is used for detecting whether the power supply voltage of the storage device of the intelligent television is reduced or not and triggering and controlling the storage device to stop working; the voltage comparison unit comprises a primary voltage comparison circuit, a first voltage comparison circuit and a second voltage comparison circuit, wherein the primary voltage comparison circuit is used for comparing a power supply voltage with a set voltage threshold value, judging whether the power supply voltage is increased to a voltage before triggering and controlling the storage equipment to stop working or not, and correspondingly providing a first trigger signal; the decision unit is used for deciding whether to control the storage device to work again or not according to the detection signal provided by the step of detecting the power supply voltage of the storage device and at least one trigger signal provided by the voltage comparison unit.

9. The method of claim 8, wherein the voltage comparison unit further comprises: the first-stage current comparison circuit is used for detecting the associated current of the storage device, judging whether the associated current lasts or not and correspondingly providing a second trigger signal; alternatively, the voltage comparing unit includes: and the other voltage comparison circuit is used for comparing the power supply voltage with a set voltage threshold value, judging whether the power supply voltage is increased to a voltage before triggering and controlling the storage equipment to stop working or not, and correspondingly providing a second trigger signal.