CN112684722A - Low-power consumption power supply control circuit - Google Patents
Low-power consumption power supply control circuit Download PDFInfo
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- CN112684722A CN112684722A CN202011504093.3A CN202011504093A CN112684722A CN 112684722 A CN112684722 A CN 112684722A CN 202011504093 A CN202011504093 A CN 202011504093A CN 112684722 A CN112684722 A CN 112684722A
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Abstract
The invention provides a low-power consumption power supply control circuit, which is used for performing low-power consumption control on a TOF module and is characterized by comprising the following steps: the Bluetooth module is in Bluetooth pairing with a user terminal held by a user in advance and is used for outputting a Bluetooth connection signal and a dormancy signal; a proximity sensor for outputting a sensor signal; the low-power-consumption control circuit and the power management module are used for supplying power to the TOF module to work when the low-power-consumption control circuit outputs the effective level, and enabling the TOF module to power down when the low-power-consumption control circuit outputs the ineffective level.
Description
Technical Field
The invention relates to a low-power-consumption power supply control circuit for a ToF module.
Background
Present TOF product consumption is generally than higher, and its power supply mode has two kinds of modes, and firstly directly get the electricity from the computer through the USB line, secondly utilize the adapter to supply power for the TOF module, and TOF module consumption that these two kinds of power supply modes lead to is all higher, generally more than 2.5W. Therefore, it is necessary to provide the TOF module with a standby mode to avoid excessive power consumption.
Generally, in order to implement the standby mode, a small Micro Controller Unit (MCU) is generally required to be added to the TOF module, that is, when the TOF module is in the standby mode, the MCU controls the power supply Unit of the electronic device not to supply power to each functional module of the electronic device, so that the TOF module stops working and is in the standby mode.
However, although this method can effectively control the standby power consumption, it needs to add an additional small MCU, and the manufacturing cost of the TOF module is increased, and the operating small MCU also causes additional power consumption.
In addition, the TOF module often needs a mechanical signal to trigger to release the standby mode, and various problems may be caused if the trigger mechanism of the mechanical signal is improperly set, for example, the complicated mechanism may cause inconvenience for users, and the simple mechanism may cause frequent false triggering of the mechanical signal, which may greatly increase the power consumption of the TOF module during standby.
Disclosure of Invention
In order to solve the problems, the invention provides a low-power-consumption power supply control circuit which can automatically power off at regular time and enable a user to conveniently restart the power supply control circuit when a face recognition component is started in a non-inductive manner, and the invention adopts the following technical scheme:
the invention provides a low-power-consumption power supply control circuit, which is used for performing low-power-consumption control on a TOF module and is characterized by comprising the following steps: the Bluetooth module is in Bluetooth pairing with a user terminal held by a user in advance and is used for outputting a Bluetooth connection signal and a dormancy signal; a proximity sensor for outputting a sensor signal; the low-power consumption control circuit is electrically connected with the Bluetooth module and the proximity sensor; and a power management module electrically connected to the low power consumption control circuit and the TOF module, respectively, for supplying power to the TOF module when the low power consumption control circuit outputs an active level and powering down the TOF module when the low power consumption control circuit outputs an inactive level, wherein a Bluetooth connection signal is in an active level state when the Bluetooth module is in Bluetooth connection with the user terminal and is in an inactive level state when the Bluetooth module is not in Bluetooth connection with the user terminal, a sleep signal is changed from the inactive level state to an active level state when a duration of the Bluetooth module in Bluetooth connection exceeds a predetermined time, a sensor signal is in an active level state when the proximity sensor is shielded by the user and is in an inactive level state when the proximity sensor is not shielded by the user, and when the Bluetooth connection signal is in the active level state and the sleep signal is in the inactive level state, the low-power consumption control circuit outputs an effective level, when the Bluetooth connection signal is in an effective level state, if the dormancy signal is changed into the effective level state and the sensor signal is not in the effective level state, the low-power consumption control circuit outputs an invalid level and further continuously outputs the effective level after the sensor signal is in the effective level state, and when the Bluetooth connection signal is in the invalid level state, the low-power consumption control circuit outputs the invalid level.
The low power consumption power control circuit provided by the invention can also have the technical characteristics that the Bluetooth module is provided with a connection signal output pin for outputting a Bluetooth connection signal and a first dormancy signal output pin and a second dormancy signal output pin for outputting a dormancy signal, the proximity sensor is provided with a sensor signal output pin for outputting a sensor signal, the connection signal output pin outputs low level when the Bluetooth connection signal is in an active level state, the first dormancy signal output pin outputs low level and the second dormancy signal output pin outputs high level when the dormancy signal is in the active level state,
the low power consumption control circuit comprises a first NOT gate, a first AND gate, a second NOT gate, a first OR gate, a second AND gate, a third AND gate and a second OR gate, wherein the input terminal of the first NOT gate is electrically connected with the signal output pin, the two input terminals of the first AND gate are respectively and electrically connected with the output terminal of the first NOT gate and the first dormancy signal output pin, the input terminal of the second NOT gate is electrically connected with the signal output pin of the sensor, the two input terminals of the first OR gate are respectively and electrically connected with the output terminal of the second NOT gate and the output terminal of the second AND gate, the two input terminals of the second AND gate are respectively and electrically connected with the output terminal of the first OR gate and the output terminal of the first NOT gate, the two input terminals of the third AND gate are respectively and electrically connected with the output terminal of the second AND gate and the output terminal of the first NOT gate, two input terminals of the second or gate are respectively and electrically connected with the output terminal of the first and gate and the output terminal of the third and gate, and the output terminal of the second or gate is electrically connected with the power management module.
The low power consumption power supply control circuit provided by the invention can also have the technical characteristics that: the power supply conversion circuit is electrically connected with the power supply input node and the Bluetooth module, the power supply output node is electrically connected with the first NOT gate, the first AND gate, the second NOT gate, the first OR gate, the second AND gate, the third AND gate, the second OR gate and the proximity sensor, the source electrode of the MOS transistor is electrically connected with the power supply input node, the drain electrode of the MOS transistor is electrically connected with the power supply output node, the gate electrode of the MOS transistor is electrically connected with the signal output pin, and when the signal output pin outputs a low level, the source electrode is communicated with the drain electrode and the current of the power supply conversion circuit flows to the power supply output node.
The low-power-consumption power supply control circuit provided by the invention can also have the technical characteristics that the power supply conversion circuit is electrically connected with the Bluetooth module through magnetic beads.
The low-power-consumption power supply control circuit provided by the invention can also have the technical characteristics that the proximity sensor is any one of an infrared LED sensor, a sensor needing an external infrared LED and an ultrasonic distance sensor.
The low-power-consumption power supply control circuit provided by the invention can also have the technical characteristics that the preset sensing distance for sensing the shielding by the proximity sensor is 10-50 cm.
The low power consumption power supply control circuit provided by the invention can also have the technical characteristics that: the indicator light module, wherein, the indicator light module includes a signal indicator light of being connected with the bluetooth module electricity at least, and the signal indicator light lights when bluetooth connection signal is the active level state to go out when bluetooth connection signal is the invalid level state.
Action and Effect of the invention
According to the low-power-consumption power supply control circuit, the Bluetooth module and the low-power-consumption control circuit are arranged, the low-power-consumption control circuit controls the power supply management module to enable the TOF module to work or power down, the power supply management module enables the face recognition module to power down in the low-power-consumption mode, and meanwhile broadcasting is carried out only through the Bluetooth module with low energy consumption, so that the quiescent current of the whole circuit can be kept below 200uA in the low-power-consumption mode, and the power consumption of the TOF module can be well saved. Simultaneously, sense user terminal and form the bluetooth and connect at bluetooth module, and the user does not operate the TOF module for a long time, can export dormancy signal and give low-power consumption control circuit, thereby low-power consumption control circuit will export invalid level and give power management module and let the TOF module fall the power, consequently, when user terminal mistake income bluetooth module's broadcast within range, the low-power consumption control circuit of this embodiment also can control TOF module and in time get into the low-power consumption mode, prevent because the user is near or when user terminal misplaces near the TOF module, the TOF module is long-time worked and is produced a large amount of consumptions. Furthermore, still owing to have the proximity sensor that just can work effectively under the bluetooth connection status, make power management module for TOF module power-on through exporting an effectual sensor signal when sensing user's action, consequently, through such a mode, not only avoided non-user's mistake to touch and lead to frequently triggering normal operating mode and produce a large amount of power consumptions, but also guaranteed that the user can conveniently start TOF module and get into normal operating mode, promoted user experience.
In addition, for the use environment with low power consumption requirement, the bluetooth module can set a larger broadcast interval so as to further reduce the power consumption of the bluetooth module, so that the power consumption of the whole circuit is reduced to the minimum, and can be as low as 30 uA.
Drawings
FIG. 1 is a block diagram of a low power consumption power control circuit according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a power conversion circuit according to an embodiment of the invention;
FIG. 3 is a circuit diagram of a Bluetooth module in an embodiment of the present invention;
FIG. 4 is a circuit diagram of a proximity sensor in an embodiment of the present invention;
FIG. 5 is a circuit diagram of a low power consumption control circuit in an embodiment of the present invention;
FIG. 6 is an equivalent logic diagram of a low power consumption control circuit in an embodiment of the present invention; and
fig. 7 is a logic table of a low power consumption control circuit in an embodiment of the present invention.
Detailed Description
In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the low power consumption power control circuit of the invention is specifically described below with reference to the embodiments and the accompanying drawings.
< example >
Fig. 1 is a block diagram of a low power consumption power supply control circuit according to an embodiment of the present invention.
As shown in fig. 1, the low power consumption power control circuit 100 includes a power conversion circuit 101, a bluetooth module 102, a proximity sensor 103, a low power consumption control circuit 104, an indicator light module 105, a power supply 106, and a power management module 107, and the low power consumption power control circuit 100 is configured to perform power control on the TOF module 200.
The whole low-power-consumption power supply control circuit 100 has a low-power-consumption mode and a normal working mode, when a user leaves, the low-power-consumption power supply control circuit 100 controls the TOF module 200 to be powered off so as to enable the TOF module to be in the low-power-consumption mode, and power consumption is saved; when a user holds a user terminal 300 (e.g., a mobile phone) and approaches a vehicle, the bluetooth module 102 of the low power consumption power control circuit 100 senses the bluetooth connection of the user terminal 300 and controls the TOF module 200 to be powered on so as to enter a normal operation mode, which will be described in detail below.
The power conversion circuit 101 is electrically connected to the bluetooth module 102, the proximity sensor 103, the indicator lamp module 105, the low power consumption control circuit 104, and the power supply 106.
Fig. 2 is a circuit diagram of a power conversion circuit in an embodiment of the invention.
As shown in fig. 2, the power conversion circuit 101 has a power chip U1, a capacitor C1, and a capacitor C2. The power conversion circuit 101 is used to receive a voltage input (DC12V) from a power supply 106, and to reduce the high voltage to a supply voltage (VCC3V3) for the bluetooth module 10, the proximity sensor 103, the indicator light module 105, and the low power control circuit 104 through a voltage reducer. The model of the power supply chip U1 is HT 7533-1.
In this embodiment, an application developed for matching with the bluetooth module 102 is installed in the user terminal 300, and the user terminal 300 is installed with firmware matching with the bluetooth module 102.
The bluetooth module 102 is used for performing bluetooth broadcasting and performs connection and communication with the user terminal 300 through a bluetooth protocol when the user terminal 300 enters a broadcasting range.
Fig. 3 is a circuit diagram of a bluetooth module in an embodiment of the present invention.
As shown in fig. 3, the bluetooth module 30 is composed of a bluetooth element U2, a magnetic bead FB1, capacitors C3, C4, and C5. Specifically, the method comprises the following steps:
the bluetooth element U2 has a UART _ RX pin, a UART _ TX pin, a Wakeup pin, a TMS pin, a TCK pin, a BLE _ RST pin, a BleState pin (i.e., a connection signal output pin), and a handting _ IO pin (i.e., a first sleep signal output pin) and a PWR _ IO pin (i.e., a second sleep signal output pin).
The magnetic bead FB1 is electrically connected to the VDD terminal of the bluetooth device U2 and the VCC3V3 node of the power conversion circuit 101, respectively, and is used to isolate the electrical connection between the power conversion circuit 20 and the bluetooth module 30, so as to eliminate the noise in the power supply and increase the stability of the circuit.
In this embodiment, the bluetooth module 102 is provided with a predetermined broadcast range and a broadcast interval, and it continuously performs bluetooth broadcast within the broadcast range according to the broadcast interval, so as to detect the user terminal 300 within the predetermined broadcast range until a connection is established with the user terminal 300.
When the bluetooth module 102 is not connected to the user terminal 300, the status level of each IO port of the bluetooth module depends on the firmware setting in the bluetooth module, that is, the BleState pin is at high level "1", the handting _ IO pin is at high level "1", and the PWR _ IO pin is at low level "0".
Once the bluetooth module 102 and the user terminal 300 successfully establish the bluetooth connection, that is, when the user terminal 300 enters the broadcast range of bluetooth and completes the connection automatically, the BleState pin is changed to low level, and the low power consumption power control circuit 100 controls the TOF module 200 to enter a normal operating mode.
Further, when the connection established by the bluetooth module 102 exceeds a certain time and the user does not operate the TOF module, the TOF module sends a serial port sleep signal to the bluetooth module 102 through the UART _ RX pin and the UART _ TX pin, and at this time, the handting _ IO pin of the bluetooth module 102 is changed into a low level and the PWR _ IO pin is changed into a high level, so that the low power consumption power supply control circuit 100 controls the TOF module 200 to enter a low power consumption state.
In actual use, when the user terminal 300 establishes a connection with the bluetooth module 102 for the first time, a manual connection by the user is required. Specifically, the method comprises the following steps: the user terminal 300 may include an App that is configured with the bluetooth module 102, and the user inputs a password through the App and completes a first connection with the bluetooth module 102. Once the connection is successful, any subsequent Bluetooth connection does not need the user to open the mobile phone App again or the App is in an active state, and the non-inductive triggering can be realized.
In addition, through the App, the user terminal 300 may display a broadcast range setting screen, so that the user can set a broadcast range and a broadcast interval of the bluetooth module 102. Meanwhile, the factory password of each bluetooth module 102 is the same, and the user can modify the password through the App of the user terminal 300.
The proximity sensor 103 is a sensor that needs to be externally connected with an infrared LED, and senses whether the sensor is shielded or not through the infrared LED. Through setting up this proximity sensor 103, can let the user through waving modes such as hand before proximity sensor 103, awaken the TOF module that gets into the dormancy because of not being operated for a long time under the bluetooth connection state.
FIG. 4 is a circuit diagram of a proximity sensor in an embodiment of the present invention.
As shown in fig. 4, the circuit of the proximity sensor 103 includes a sensor U3, a resistor R1, a resistor R2, a resistor R3, a resistor R4, a resistor R5, an indicator light D1, and an LED light D2. Specifically, the method comprises the following steps:
the sensor U3 is model SI1102-A-GM having an RPX pin, a TXO pin, an NC pin, a TXXGD pin, a VDD pin, a SEN pin, an FR pin, and a VSS pin.
The RPX pin is electrically connected to the indicator light D1 and the low power consumption control circuit 104, and the TXO pin is electrically connected to the LED light D2. When the infrared light source emitted by the LED lamp D2 is blocked from being reflected into and received by the sensor U3, it indicates that the proximity sensor 103 is activated, and the RPX pin is at a low level, causing D1 to light.
In this embodiment, the user may set an emission frequency and a detection distance by the proximity sensor 103 through the user terminal 300, where the emission frequency is a light emitting time interval of the chip-controlled LED lamp D2, and the detection distance is a critical distance that enables the proximity sensor to be triggered (the level of the PRX pin is low). In this embodiment, the range of the detection distance is 10-50cm, and the configuration adjustment can be performed according to the actual situation.
The NC pin, the TXXGD pin and the VSS pin are all electrically connected to GND ground, and the SEN pin and the FR pin are connected to GND ground after passing through resistors R4 and R5 respectively.
The VDD pin is electrically connected to a power supply output node (VDD3V3 node) described later via a resistor R2.
When the bluetooth of the ue 300 is connected to the bluetooth module 102, the TOF module 200 enters a normal operation mode. However, the normal operation mode is power-consuming and cannot be in this mode for a long time, so if the user does not operate the TOF module 200 for a while, the TOF module 200 will send a serial sleep signal to the bluetooth module 102 to automatically enter the low power mode. At this time, if the user needs to operate the TOF module 200 to perform face recognition unlocking and needs to wake up, the proximity sensor 103 is used to wake up the TOF module 200 to enter the normal operation mode under the condition that the bluetooth module 102 is in the bluetooth connection state and the TOF module 200 enters the low power consumption mode.
The low power consumption control circuit 104 is configured to send corresponding enable signals to the power management module 107 according to the level signals output by the bluetooth module 102 and the proximity sensor 103, so as to control the TOF module 200 to switch between the low power consumption mode and the normal operation mode.
Fig. 5 is a circuit diagram of a low power consumption control circuit in an embodiment of the present invention.
As shown in fig. 5, the low power consumption control circuit 104 includes a power input node VCC3V3, a MOS transistor Q1, a power output node VDD3V3, a logic device dual nand gate U4, a logic device dual or gate U5, a logic device four and gate U6, a resistor R7, and a resistor R8. Specifically, the method comprises the following steps:
the power supply input node VCC3V3 is electrically connected to the power conversion circuit 101.
The MOS transistor Q1 has a gate 1, a source 2 and a drain 3. The gate 1 is electrically connected to the BleState pin, the source 2 is electrically connected to the power input node VCC3V3, and the drain 3 is electrically connected to the power output node VDD3V 3.
When the bluetooth module 102 is not bluetooth connected to the user terminal 300, the level of the BleState pin is high, the level of the gate 1 is R8 to divide VDD3V3, i.e., is at a high level, so that the source 2 and the drain 3 are in an off state. At this time, the current of the power input node VCC3V3 cannot be input to the power output node VDD3V3, the power conversion circuit 101 only supplies power to the bluetooth module 102, and each logic device U4, U5, and U6 cannot operate, the power consumption of the whole circuit 100 is the self static power consumption of U1, and the system current is less than 200uA (microampere).
When the bluetooth module 102 establishes a bluetooth connection with the ue 300, the level of the BleState pin is low, and the source 2 and the drain 3 are turned on. At this time, the power output node VDD3V3 normally obtains the power current of the power input node VCC3V3 and supplies power to the logic devices U4, U5, U6 and the sensor U3.
The logic device two-way nand gate U4 has two-way nand gates.
Both input terminals 1A and 1B of the first nand gate are electrically connected to the BleState pin, so that the first nand gate can be regarded as an inverter and outputs a level signal BleState _ N which is inverted to the BleState pin through the output terminal 1Y.
Similarly, the two input terminals 2A and 2B of the second nand gate are electrically connected to the RPX pin, and output a level signal SI _ RPX _ N having a phase opposite to that of the RPX pin through the output terminal 2Y.
The logic device two-way or gate U5 has a two-way or gate.
The two input terminals 1A and 1B of the first or gate are electrically connected to the output terminal 2Y (SI _ RPX _ N) of U4 and the output terminal 1Y of U6, respectively.
Two input terminals 2A and 2B of the second or gate are electrically connected to an output terminal 2Y of U6 and an output terminal 4Y of U6, respectively, and an ADP5V _ EN signal output by the output terminal 2Y (i.e., an enable pin of the low power consumption control circuit 104) is an enable signal output by the low power consumption control circuit 104 for controlling power-on or power-off of the power management module 107.
The logic device four-way and gate U6 has four-way and gates, only three of which are used in this embodiment.
Two input terminals 1A and 1B of the first and gate are electrically connected to an output terminal 1Y of U5 and a handtree _ IO pin of the bluetooth module 102, respectively.
Two input terminals 2A and 2B of the second and gate are electrically connected to an output terminal 1Y of the first and gate in U6 and an output terminal 1Y of U4 (BleState _ N), respectively.
The third and gate is not used.
Two input terminals 4A and 4B of the fourth and gate are electrically connected to output terminal 1Y (BleState _ N) of U4 and PWR _ IO pin of bluetooth module 102, respectively.
When the BleState pin of the bluetooth module 102 outputs a high level, the level of the enable signal ADP5V _ EN output by the low power consumption control circuit 104 is low, and the power management module 107 is in a power-off state and powers down the whole TOF module 200.
When the BleState pin of the bluetooth module 102 outputs a low level, the source 2 and the drain 3 of the MOS transistor Q1 are turned on, VCC3V3 flows through the MOS transistor to supply power to the inverters U4, U5, and U6, and the level of the enable signal ADP5V _ EN output by the low power consumption control circuit 104 is high, at this time, the power management module 107 is powered on and the TOF module 200 starts to operate.
Fig. 6 is an equivalent logic diagram of a low power consumption control circuit in an embodiment of the present invention.
For ease of understanding, the above logic devices U4, U5, U6 in the low power consumption control circuit 104 may be equivalent to a circuit logic diagram as shown in fig. 6. The low power control circuit 104 can be viewed as a sensor signal logic 1041 and a bluetooth signal logic 1042.
Fig. 7 is a logic table of a low power consumption control circuit in an embodiment of the present invention.
As shown in fig. 6 and 7, the logic of the low power consumption control circuit in each case is specifically as follows:
when the entire circuit 100 is in a default state, that is, the circuit 100 has just switched on the power supply and the bluetooth module 102 is not bluetooth connected, the levels of the BleState pin, the handfig _ IO pin, and the PWR _ IO pin of the bluetooth module 102 are set to 1, 0, and 1, respectively. At this time, the proximity sensor 103 is also not triggered, and its RPX pin is 1. At this time, as can be seen from fig. 6, the level signals output by the sensor signal logic 1041 and the bluetooth signal logic 1042 are both 0, so that the finally output enable signal ADP5V _ EN is also 0, and the TOF module 200 is powered down.
When the bluetooth module 102 establishes a communication connection with the user terminal 300, the level of the BleState pin is changed to 0, the level signal output by the bluetooth signal logic circuit 1042 is changed to 1, and therefore, the finally output enable signal ADP5V _ EN is changed to 1, and the TOF module 200 is powered on.
When the bluetooth module 102 is connected with the user terminal 300 for a certain time, the TOF module 200 is not operated by the user all the time and sends a shutdown command to the bluetooth module 102 through the serial port, at this time, the levels of the handting _ IO pin and the PWR _ IO pin are respectively changed into 1 and 0, the level signal output by the corresponding bluetooth signal logic circuit 1042 is changed into 0, and the TOF module 200 is powered down.
In the case where the bluetooth module 102 remains connected to the user terminal 300, once the proximity sensor 103 is triggered by being blocked, the level of the RPX pin is changed to 0, and the level signal output by the sensor signal logic 1041 is changed to 1, and the TOF module 200 is powered on. Moreover, since the level of the node 10411 also changes to the high level, even if the proximity sensor 103 is not blocked any more (e.g., the proximity sensor 103 is blocked for a short time when the user takes a hand-waving gesture), and the level of the RPX pin changes to 1 again, the level signal output by the sensor signal logic circuit 1041 does not change.
In addition, when the level signal of the handfig _ IO pin is not converted into 1, since the and gate is arranged between the handfig _ IO and the SI _ RPX _ N, the output of the sensor signal logic circuit 1041 is not converted into 1 no matter whether the proximity sensor 103 is triggered at this time, and frequent start of the TOF module 200 caused by false triggering of the sensor signal logic circuit 1041 when the bluetooth is disconnected can be avoided.
When the bluetooth module 102 is disconnected from the user terminal 300, the level of the BleState pin is changed to 1, at this time, the level signals output by the sensor signal logic circuit 1041 and the bluetooth signal logic circuit 1042 are both changed to 0, and the TOF module 200 is powered down.
The indicator module 105 is composed of a resistor R6 and an indicator D3, as shown in fig. 5, the resistor R6 and the indicator D3 are electrically connected to the bluetooth module 102, and when the BleState pin is at a low level, the signal indicator D3 lights, which indicates that the APP of the user terminal 300 and the bluetooth module are successfully connected. When the user terminal 300 leaves the bluetooth broadcast range, the indicator lamp D3 goes off, indicating that the APP and bluetooth of the user terminal 300 are disconnected.
The power supply 106 is a DC12V power supply that provides power to the entire system (including the circuit 100 and the TOF module 200). The power supply 106 supplies power to the power conversion circuit 102 and the power management module 107 at the same time. In this embodiment, the power supply 106 may be an adapter, a switching power supply, and other power supply modules.
The TOF module 200 includes a unit for acquiring and converting photoelectric signals, outputting and displaying signals, and the like, and is used for performing operations such as face recognition and the like. The power management module 107 manages power supply of the TOF module 200 according to an enable signal ADP5V _ EN output by the low-power control circuit 104 on the enable pin.
When the enable signal output by the low power consumption control circuit 104 is at a high level "1", the power management module 107 is powered on, and obtains the power of the DC12V from the power supply 106 to supply to the TOF module 200, so that the TOF module starts to operate normally.
When the enable signal output by the low power consumption control circuit 104 is low level "0", the power management module 107 is powered down and is electrically disconnected from the power supply 106, so that the TOF module 200 is powered down and enters a sleep state.
Examples effects and effects
According to the low-power consumption power control circuit that this embodiment provided, owing to have bluetooth module and low-power consumption control circuit, low-power consumption control circuit control power management module lets TOF module work or fall the power to power management module lets the face identification module power down under the low-power consumption mode, only broadcasts through the bluetooth module that the power consumption is lower simultaneously, consequently under the low-power consumption mode, the quiescent current of whole circuit can keep below 200uA, can save the power consumption of TOF module well. Simultaneously, sense user terminal and form the bluetooth and connect at bluetooth module, and the user does not operate the TOF module for a long time, can export dormancy signal and give low-power consumption control circuit, thereby low-power consumption control circuit will export invalid level and give power management module and let the TOF module fall the power, consequently, when user terminal mistake income bluetooth module's broadcast within range, the low-power consumption control circuit of this embodiment also can control TOF module and in time get into the low-power consumption mode, prevent because the user is near or when user terminal misplaces near the TOF module, the TOF module is long-time worked and is produced a large amount of consumptions. Furthermore, still owing to have the proximity sensor that just can work effectively under the bluetooth connection status, make power management module for TOF module power-on through exporting an effectual sensor signal when sensing user's action, consequently, through such a mode, not only avoided non-user's mistake to touch and lead to frequently triggering normal operating mode and produce a large amount of power consumptions, but also guaranteed that the user can conveniently start TOF module and get into normal operating mode, promoted user experience.
In addition, in the embodiment, the low-power-consumption control circuit is further provided with a power input node, an MOS tube and a power output node, and a gate pole of the MOS tube is electrically connected with a connection signal output pin of the Bluetooth module, so that when the Bluetooth module is not in Bluetooth connection with the user terminal, a source electrode connected with the power input node in the MOS tube and a drain electrode connected with the power output node are in a disconnected state, various logic judgment components and a proximity sensor in the low-power-consumption control circuit are in a power-down state, and only the Bluetooth module performs Bluetooth broadcasting work, so that the consumption of the whole low-power-consumption control circuit can be reduced to the minimum.
The above-described embodiments are merely illustrative of specific embodiments of the present invention, and the present invention is not limited to the description of the above-described embodiments.
For example, in the above embodiment, the proximity sensor is a sensor externally connected with an infrared LED, and alternatively, the proximity sensor may also be an infrared LED sensor or an ultrasonic distance sensor, which can achieve the same effect.
For example, in the above embodiment, the user terminal is a mobile phone, and in other aspects of the present invention, the mobile terminal may also be a wearable device, a tablet, or any device that has an application program matching with a bluetooth module and has a bluetooth pairing function.
For example, the bluetooth module in the above embodiments may be a commercially mature bluetooth module, or may be a circuit including a bluetooth chip. When replacing the bluetooth module, it should be noted that the communication between the bluetooth module and the APP in the user terminal is implemented based on the bluetooth protocol, so the bluetooth module itself needs to support the bluetooth communication protocol with low power consumption, and the protocol includes bluetooth 4.0, bluetooth 4.2, bluetooth 5.0 and above.
For example, in the above embodiment, a power conversion circuit composed of the power chip U1, the capacitors C1 and C2 is shown, but in other aspects of the present invention, the power conversion circuit may be a low dropout linear regulator, a DC/DC power conversion module, or other circuits for realizing power conversion.
Claims (7)
1. The utility model provides a low-power consumption power control circuit for carry out low-power consumption control to the TOF module, its characterized in that includes:
the Bluetooth module is in Bluetooth pairing with a user terminal held by a user in advance and is used for outputting a Bluetooth connection signal and a dormancy signal;
a proximity sensor for outputting a sensor signal;
the low-power consumption control circuit is electrically connected with the Bluetooth module and the proximity sensor; and
a power management module which is respectively and electrically connected with the low-power control circuit and the TOF module and is used for supplying power to the TOF module to work when the low-power control circuit outputs an effective level and powering down the TOF module when the low-power control circuit outputs an ineffective level,
wherein the Bluetooth connection signal is in an active level state when the Bluetooth module performs Bluetooth connection with the user terminal and is in an inactive level state when the Bluetooth module does not perform Bluetooth connection with the user terminal,
the sleep signal transitions from an inactive level state to an active level state when the Bluetooth module is in the Bluetooth connection for more than a predetermined time and the TOF module is not operated by the user,
the sensor signal is in an active level state when the proximity sensor is occluded by the user and in an inactive level state when the proximity sensor is not occluded by the user,
the low power consumption control circuit outputs the active level when the bluetooth connection signal is in an active level state and the sleep signal is in an inactive level state,
when the Bluetooth connection signal is in an active level state, if the sleep signal is converted into an active level state and the sensor signal is not in an active level state, the low power consumption control circuit outputs the inactive level and further continuously outputs the active level after the sensor signal is in the active level state,
and when the Bluetooth connection signal is in an invalid level state, the low-power consumption control module outputs the invalid level.
2. The low power consumption power supply control circuit according to claim 1, wherein:
wherein the Bluetooth module has a connection signal output pin for outputting the Bluetooth connection signal and a first sleep signal output pin and a second sleep signal output pin for outputting the sleep signal,
the proximity sensor has a sensor signal output pin for outputting the sensor signal,
the connection signal output pin outputs a low level when the bluetooth connection signal is in an active level state,
the first sleep signal output pin outputs a low level and the second sleep signal output pin outputs a high level when the sleep signal is in an active level state,
the sensor signal output pin outputs a low level when the sensor signal is in an active level state,
the low-power consumption control circuit is provided with a first NOT gate, a first AND gate, a second NOT gate, a first OR gate, a second AND gate, a third AND gate and a second OR gate,
an input terminal of the first not gate is electrically connected to the connection signal output pin,
two input terminals of the first AND gate are respectively electrically connected with an output terminal of the first NOT gate and the first sleep signal output pin,
an input terminal of the second not gate is electrically connected to the sensor signal output pin,
two input terminals of the first or gate are electrically connected to an output terminal of the second not gate and an output terminal of the second and gate, respectively,
two input terminals of the second AND gate are respectively electrically connected with the output terminal of the first OR gate and the second sleep signal output pin,
two input terminals of the third AND gate are electrically connected with an output terminal of the second AND gate and an output terminal of the first NOT gate respectively,
and the two input terminals of the second OR gate are respectively and electrically connected with the output terminal of the first AND gate and the output terminal of the third AND gate, and the output terminal of the second OR gate is electrically connected with the power management module.
3. The low power consumption power supply control circuit according to claim 2, further comprising:
a power supply conversion circuit for converting the power supply voltage of the power supply,
wherein the low power consumption control circuit is also provided with a power supply input node, an MOS tube and a power supply output node,
the power supply conversion circuit is electrically connected with the power supply input node and the Bluetooth module,
the power supply output node is electrically connected with the first NOT gate, the first AND gate, the second NOT gate, the first OR gate, the second AND gate, the third AND gate, the second OR gate and the proximity sensor,
the source electrode of the MOS tube is electrically connected with the power input node, the drain electrode of the MOS tube is electrically connected with the power output node, the gate electrode of the MOS tube is electrically connected with the connection signal output pin,
when the signal output pin outputs a low level, the source electrode is communicated with the drain electrode, and the current of the power supply conversion circuit flows to the power supply output node.
4. The low power consumption power supply control circuit according to claim 3, wherein:
the power conversion circuit is electrically connected with the Bluetooth module through magnetic beads.
5. The low power consumption power supply control circuit according to claim 1, wherein:
the proximity sensor is any one of an infrared LED sensor, a sensor needing an external infrared LED and an ultrasonic distance sensor.
6. The low power consumption power supply control circuit according to claim 1, wherein:
wherein the preset detection distance for the proximity sensor to sense the shielding is 10-50 cm.
7. The low power consumption power supply control circuit according to claim 1, further comprising:
an indicator light module, which is used for indicating the light,
wherein the indicator light module at least comprises a signal indicator light electrically connected with the Bluetooth module,
the signal indicator lamp is turned on when the Bluetooth connection signal is in an active level state, and is turned off when the Bluetooth connection signal is in an inactive level state.
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Application publication date: 20210420 |