CN203788004U - Power supply management circuit and liquid crystal display device - Google Patents
Power supply management circuit and liquid crystal display device Download PDFInfo
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- CN203788004U CN203788004U CN201420093546.1U CN201420093546U CN203788004U CN 203788004 U CN203788004 U CN 203788004U CN 201420093546 U CN201420093546 U CN 201420093546U CN 203788004 U CN203788004 U CN 203788004U
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Abstract
The utility model discloses a power supply management circuit and a liquid crystal display device. The power supply management circuit comprises a main controller, a power supply input terminal, a power supply output terminal, a switch module, a first switch control module, a second switch control module, an on-off control module, a reset control module and a reset controller. According to the power supply management circuit and the liquid crystal display device, the first switch control module or the second switch control module is employed to control the on-off of the switch module, the on-off control module outputs on-off signals to the main controller or the reset control module and outputs reset signals to the reset controller so that when the liquid crystal display device employs a built-in charging cell to supply power, functions of power-on, standby, shutdown and reset of the liquid crystal display device can be controlled, the power supply of the charging cell can be controlled when the liquid crystal display device is powered on, the power supply of the charging cell is cut off when the liquid crystal display device is shut down, and the power supply management of the built-in charging cell of the liquid crystal display device is realized.
Description
Technical Field
The utility model relates to the field of electronic technology, especially, relate to a power management circuit and liquid crystal display equipment.
Background
The lcd tv has a larger screen and requires a higher backlight voltage, so that the lcd tv requires a higher driving voltage than a common handheld portable device. For the convenience of use, TCL lcd televisions such as iCE SCREEN can be powered by built-in rechargeable batteries, and since the batteries have high series voltage and high conversion efficiency, the rechargeable batteries built in the lcd televisions generally use a series power supply method. The common power management chip is applied to handheld portable equipment such as mobile phones, and the battery voltage capable of being managed is nominally 3.7V and the highest voltage is 4.2V. However, since the rechargeable battery built in the liquid crystal television supplies power by a series power supply method, the battery voltage is high, and thus the power supply cannot be managed by a general power supply management chip. Therefore, it is a problem to be solved to implement power management on a rechargeable battery built in a liquid crystal display device (especially, a liquid crystal display device requiring a high power supply voltage, such as a liquid crystal television) without using a power management chip.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a power management circuit and liquid crystal display equipment with same inventive concept aims at realizing carrying out power management to the built-in rechargeable battery of liquid crystal display equipment.
In order to achieve the above object, the present invention provides a power management circuit, which is respectively connected with a rechargeable battery and a work load, and comprises a main controller, a power input terminal, a power output terminal, a switch module, a first switch control module, a second switch control module, a reset control module and a reset controller;
the input end of the switch module is connected with the rechargeable battery through the power supply input end, and the output end of the switch module is connected with the working load through the power supply output end; the input end of the first switch control module is connected with the signal output end of the main controller, and the output end of the first switch control module is connected with the control end of the switch module; the input end of the second switch control module is connected with the control end of the switch module, and the output end of the second switch control module is respectively connected with the input end of the switch control module and the input end of the reset control module; the output end of the on-off control module is connected with the on-off detection end of the main controller, and the output end of the reset control module is connected with the reset detection end of the reset controller.
Preferably, the switch module comprises a MOS transistor and a first resistor connected between a source and a gate of the MOS transistor;
the source electrode of the MOS tube is connected with the power input end, the grid electrode of the MOS tube is respectively connected with the output end of the first switch control module and the input end of the second switch control module, and the drain electrode of the MOS tube is connected with the power output end.
Preferably, the MOS transistor is a PMOS transistor with 8 pins, and the PMOS transistor includes a gate, three interconnected sources, and four interconnected drains.
Preferably, the first switch control module comprises a first electronic switch, a second resistor, a third resistor, a fourth resistor and a first capacitor;
one end of the second resistor is connected with a signal output end of the main controller, the other end of the second resistor is connected with a control end of the first electronic switch and is grounded through the third resistor, and the first capacitor is connected with the third resistor in parallel; the first end of the first electronic switch is connected with the grid electrode of the MOS tube through the fourth resistor, and the second end of the first electronic switch is grounded.
Preferably, the second switch control module comprises a key switch, a fifth resistor, a sixth resistor and a voltage regulator tube;
one end of the key switch is connected with the grid electrode of the MOS tube, and the other end of the key switch is grounded through the fifth resistor and the sixth resistor in sequence; the cathode of the voltage-stabilizing tube is connected with the common end of the fifth resistor and the sixth resistor, and the anode of the voltage-stabilizing tube is grounded; and the common end of the fifth resistor and the sixth resistor is connected with the input end of the on-off control module and the input end of the reset control module.
Preferably, the on-off control module comprises a second electronic switch, a seventh resistor and an eighth resistor;
the control end of the second electronic switch is connected with the common end of the fifth resistor and the sixth resistor through the seventh resistor, the first end of the second electronic switch is connected with the startup and shutdown detection end of the main controller, the eighth resistor is connected with a power supply end, and the second end of the second electronic switch is grounded.
Preferably, the reset control module comprises a third electronic switch, a ninth resistor, a tenth resistor, a second capacitor and a third capacitor;
the control end of the third electronic switch is connected with the common end of the fifth resistor and the sixth resistor through the ninth resistor, the first end of the third electronic switch is connected with the reset detection end of the reset controller and is connected with the power supply end through the tenth resistor, and the second end of the third electronic switch is grounded;
one end of the second capacitor is connected with the control end of the third electronic switch, and the other end of the second capacitor is grounded; one end of the third capacitor is connected with the first end of the third electronic switch, and the other end of the third capacitor is grounded.
Preferably, the voltage of the power supply terminal is 3.3V.
Preferably, the first electronic switch is an NMOS transistor, a gate of the NMOS transistor is a control end of the first electronic switch, a drain of the NMOS transistor is a first end of the first electronic switch, and a source of the NMOS transistor is a second end of the first electronic switch;
the second electronic switch is a first NPN triode, the base electrode of the first NPN triode is the control end of the second electronic switch, the collector electrode of the first NPN triode is the first end of the second electronic switch, and the emitter electrode of the first NPN triode is the second end of the second electronic switch;
the third electronic switch is a second NPN triode, a base of the second NPN triode is a control terminal of the third electronic switch, a collector of the second NPN triode is a first terminal of the third electronic switch, and an emitter of the second NPN triode is a third terminal of the third electronic switch.
The utility model discloses further provide a liquid crystal display equipment, this liquid crystal display equipment includes rechargeable battery and work load, still includes power management circuit, and this power management circuit is connected with rechargeable battery and work load respectively, including main control unit, power input end, power output end, switch module, first switch control module, second switch control module, reset control module and reset controller; the switch module is used for switching on or switching off the connection between the power supply input end and the power supply output end, the first switch control module and the second switch control module are used for controlling the switching on and switching off of the switch module, the second switch control module is also used for controlling the switch control module to output a high-level or low-level switching on and switching off signal to the main controller, and the reset control module is also used for controlling the reset control module to output a high-level or low-level reset signal to the reset controller; wherein,
the input end of the switch module is connected with the rechargeable battery through the power supply input end, and the output end of the switch module is connected with the working load through the power supply output end; the input end of the first switch control module is connected with the signal output end of the main controller, and the output end of the first switch control module is connected with the control end of the switch module; the input end of the second switch control module is connected with the control end of the switch module, and the output end of the second switch control module is respectively connected with the input end of the switch control module and the input end of the reset control module; the output end of the on-off control module is connected with the on-off detection end of the main controller, and the output end of the reset control module is connected with the reset detection end of the reset controller.
The utility model provides a power management circuit, through first on-off control module or second on-off control module control switch module break-make state, and then through switch module control rechargeable battery's power supply state, through on-off control module output switch machine signal to main control unit moreover, reset control module output reset signal to main control unit to through main control unit control liquid crystal display equipment's operating condition. Therefore, when the liquid crystal display device is powered by the built-in rechargeable battery, the liquid crystal display device can be controlled to execute the functions of starting, standby, shutdown and reset, the switch module is switched on when the liquid crystal display device is started to control the rechargeable battery to supply power, and the switch module is switched off when the liquid crystal display device is shut down to control the rechargeable battery not to supply power, so that the power management of the built-in rechargeable battery of the liquid crystal display device is realized.
Drawings
FIG. 1 is a schematic block diagram of a preferred embodiment of the power management circuit of the present invention;
fig. 2 is a schematic circuit diagram of a preferred embodiment of the power management circuit of the present invention.
The objects, features and advantages of the present invention will be realized by the embodiments and will be further described with reference to the accompanying drawings.
Detailed Description
The technical solution of the present invention is further explained below with reference to the drawings and the specific embodiments of the specification. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The utility model provides a power management circuit.
Referring to fig. 1, fig. 1 is a schematic block diagram of a preferred embodiment of the power management circuit of the present invention.
In the preferred embodiment of the present invention, the power management circuit is applied to the liquid crystal display device with a built-in rechargeable battery and a higher voltage, such as a liquid crystal television. The power management circuit is respectively connected to a rechargeable battery (not shown) and a work load (not shown) of the liquid crystal display device, and includes a main controller 10, a power input terminal VIN, a power output terminal VOUT, a switch module 20, a first switch control module 30, a second switch control module 40, a switch control module 50, a reset control module 60, and a reset controller 70. The switch module 20 is used to turn on or off the connection between the power input terminal VIN and the power output terminal VOUT, and the first switch control module 30 and the second switch control module 40 are used to control the on/off of the switch module 20. The second switch control module 40 is further configured to control the switch control module 50 to output a high-level or low-level switch signal to the main controller 10, and further configured to control the reset control module 60 to output a high-level or low-level reset signal to the reset controller 70.
The input end of the switch module 20 is connected with the rechargeable battery through a power input end VIN, and the output end of the switch module 20 is connected with the working load through a power output end VOUT; the input end of the first switch control module 30 is connected with the signal output end of the main controller 10, and the output end of the first switch control module 30 is connected with the control end of the switch module 20; the input end of the second switch control module 40 is connected with the control end of the switch module 20, and the output end of the second switch control module 40 is respectively connected with the input end of the switch control module 50 and the input end of the reset control module 60; the output end of the on-off control module 50 is connected to the on-off detection end of the main controller 10, and the output end of the reset control module 60 is connected to the reset detection end of the reset controller 70.
In this embodiment, the power supply voltage (e.g. 24V or 12V) provided by the rechargeable battery is input to the power supply input terminal VIN, when the switch module 20 is turned on, the switch module 20 controls the rechargeable battery to supply power to the working load, and when the switch module 20 is turned off, the switch module 20 cuts off the power supply of the rechargeable battery.
In this embodiment, it is preset that when the liquid crystal display device is in a shutdown state, the signal output end of the main controller 10 outputs a low level control signal to the first switch control module 30, and the first switch control module 30 controls the switch module 20 to turn off, so as to cut off the power supply of the rechargeable battery. When the liquid crystal display device is in the power-off state, if the second switch control module 40 receives the key trigger signal, the second switch control module 40 controls the switch module 20 to be turned on in a time period when the key trigger signal is received. The switching machine control module 50 outputs a low-level switching signal to a switching machine detection end of the main controller 10, when the time for continuously receiving the key trigger signal is longer than a first preset time (e.g. 3 s) and shorter than a second preset time (e.g. 8 s), the duration of the low level output by the switching machine control module 50 is longer than the first preset time and shorter than the second preset time, the main controller 10 controls the liquid crystal display device to execute a switching-on function, and a signal output end of the main controller outputs a high-level control signal to the first switching control module 30, the first switching control module 30 controls the switching module 20 to be switched on, the power supply voltage input by the power supply input end VIN is output to a working load through the switching module 20 and the power supply output end VOUT, so that the rechargeable battery provides the power supply voltage for supplying power to the working load.
When the lcd device is turned on, the signal output terminal of the main controller 10 outputs a high level control signal to the first switch control module 30, and the first switch control module 30 controls the switch module 20 to be turned on, so as to control the rechargeable battery to supply power to the working load. When the time for continuously receiving the key trigger signal is less than the first preset time, the duration of the output low level of the on-off control module 50 is less than the first preset time, the main controller 10 controls the liquid crystal display device to be in standby, and when the time for continuously receiving the key trigger signal is greater than the first preset time and less than the second preset time, the duration of the output low level of the on-off control module 50 is greater than the first preset time and less than the second preset time, and the main controller 10 controls the liquid crystal display device to be turned off. When the main controller 10 executes the shutdown function, the signal output end thereof outputs a low level, so that the first switch control module 30 controls the switch module 20 to be turned off, and the power supply is stopped. When the liquid crystal display device is in a crash condition, the main controller 10 may also malfunction, and a reset operation is required, as follows: when the time for continuously receiving the key trigger signal is longer than the second preset time, the reset control module 60 is turned on, the reset signal output by the reset control module 60 is changed from a high level to a low level, and the reset controller 70 controls the liquid crystal display device to reset.
When the liquid crystal display device is in a standby state, the signal output end of the main controller 10 outputs a high level control signal to the first switch control module 30, and the first switch control module 30 controls the switch module 20 to be switched on to control the rechargeable battery to supply power to the working load; when the second switch control module 40 receives the key trigger signal, the power on/off signal output by the power on/off control module 50 is changed from a high level to a low level, when the time for continuously receiving the key trigger signal is less than the first preset time, the time for continuously outputting the low level by the power on/off control module 50 is less than the first preset time, the main controller 10 controls the liquid crystal display device to be started up, when the time for continuously receiving the key trigger signal is greater than the first preset time and less than the second preset time, the time for continuously outputting the low level by the power on/off control module 50 is greater than the first preset time and less than the second preset time, and the main controller 10 controls the liquid crystal display device to be stopped. When the main controller 10 executes the shutdown function, the signal output end outputs a low level, so that the first switch control module controls the switch module 20 to be turned off, and the power supply is stopped.
Compared with the prior art, the utility model discloses a power management circuit, when liquid crystal display device used built-in rechargeable battery to supply power, can control liquid crystal display device and carry out the start (including awakening up the recovery start), the standby, shut down and reset function, and when liquid crystal display device started, switch module 20 switched on, and control rechargeable battery supplies power, and when liquid crystal display device shut down, switch module 20 turned off, and control rechargeable battery did not supply power, realizes carrying out power management to the built-in rechargeable battery of liquid crystal display device.
Referring to fig. 2 again, fig. 2 is a schematic circuit diagram of a preferred embodiment of the power management circuit of the present invention.
As shown in fig. 2, the switch module 20 includes a MOS transistor U1 and a first resistor R1 connected between the source and the gate of the MOS transistor U1; the MOS tube U1 is a PMOS tube, preferably a PMOS tube with 8 pins, and comprises a gate G, three interconnected sources S1, S2 and S3, and four interconnected drains D1, D2, D3 and D4.
The source electrode of the MOS tube U1 is connected to the power input terminal VIN, the gate G of the MOS tube U1 is connected to the output terminal of the first switch control module 30 and the input terminal of the second switch control module 40, respectively, and the drain electrode of the MOS tube U1 is connected to the power output terminal VOUT.
Specifically, the first switch control module 30 includes a first electronic switch Q1, a second resistor R2, a third resistor R3, a fourth resistor R4, and a first capacitor C1.
One end of the second resistor R2 is connected to the signal output terminal VCON of the main controller 10, the other end of the second resistor R2 is connected to the control terminal of the first electronic switch Q1, and is grounded via the third resistor R3, and the first capacitor C1 is connected in parallel to the third resistor R3; a first terminal of the first electronic switch Q1 is connected to the gate G of the MOS transistor U1 via a fourth resistor R4, and a second terminal of the first electronic switch Q1 is grounded.
The first electronic switch Q1 is an NMOS transistor, a gate of the NMOS transistor is a control terminal of the first electronic switch Q1, a drain of the NMOS transistor is a first terminal of the first electronic switch Q1, and a source of the NMOS transistor is a second terminal of the first electronic switch Q1.
Specifically, the second switch control module 40 includes a key switch SW1, a fifth resistor R5, a sixth resistor R6, and a zener diode ZD 1.
One end of the key switch SW1 is connected with the gate G of the MOS tube U1, and the other end of the key switch SW1 is grounded through a fifth resistor R5 and a sixth resistor R6 in sequence; the cathode of the voltage regulator tube ZD1 is connected with the common end of the fifth resistor R5 and the sixth resistor R6, and the anode of the voltage regulator tube ZD1 is grounded; the common terminal of the fifth resistor R5 and the sixth resistor R6 is connected to the input terminal of the switch control module 50 and to the input terminal of the reset control module 60.
Specifically, the switch control module 50 includes a second electronic switch Q2, a seventh resistor R7, and an eighth resistor R8.
The control terminal of the second electronic switch Q2 is connected to the common terminal of the fifth resistor R5 and the sixth resistor R6 through the seventh resistor R7, the first terminal of the second electronic switch Q2 is connected to the power on/off detection terminal VDET1 of the main controller 10, and is connected to a power supply terminal VCC through the eighth resistor R8, and the second terminal of the second electronic switch Q2 is grounded. The voltage of the power supply terminal VCC may be 3.3V.
The second electronic switch Q2 is a first NPN transistor, a base of the first NPN transistor is a control terminal of the second electronic switch Q2, a collector of the first NPN transistor is a first terminal of the second electronic switch Q2, and an emitter of the first NPN transistor is a second terminal of the second electronic switch Q2.
Specifically, the reset control module 60 includes a third electronic switch Q3, a ninth resistor R9, a tenth resistor R10, a second capacitor C2, and a third capacitor C3.
A control terminal of the third electronic switch Q3 is connected to a common terminal of the fifth resistor R5 and the sixth resistor R6 via a ninth resistor R9, a first terminal of the third electronic switch Q3 is connected to the reset detection terminal VDET2 of the reset controller 70 and is connected to the power supply terminal VCC via a tenth resistor R10, and a second terminal of the third electronic switch Q3 is grounded; one end of the second capacitor C2 is connected with the control end of the third electronic switch Q3, and the other end of the second capacitor C2 is grounded; one end of the third capacitor C3 is connected to the first end of the third electronic switch Q3, and the other end of the third capacitor C3 is grounded.
The third electronic switch Q3 is a second NPN transistor, a base of the second NPN transistor is a control terminal of the third electronic switch Q3, a collector of the second NPN transistor is a first terminal of the third electronic switch Q3, and an emitter of the second NPN transistor is a third terminal of the third electronic switch Q3.
Specifically, the reset control module further includes an eleventh resistor R11, one end of the eleventh resistor R11 is connected to the common end of the fifth resistor R5 and the sixth resistor R6 via a ninth resistor R9, and the other end of the eleventh resistor R11 is connected to the control end of the third electronic switch Q3 and is grounded via a second capacitor C2.
The utility model discloses power management circuit's theory of operation specifically describes as follows:
in a time period when the liquid crystal display device is in an off state, during a time period when the key switch SW1 is pressed, that is, during a time period when the second switch control module 40 receives the key trigger signal, the gate G of the MOS transistor U1 is grounded via the key switch SW1, the fifth resistor R5, and the sixth resistor R6, so that the MOS transistor U1 is turned on, and at the same time, the power supply voltage (e.g., 12V or 24V) input by the power input terminal VIN is divided by the first resistor R1, the fifth resistor R5, and the sixth resistor R6 and then input to the control terminal of the second electronic switch Q2 (i.e., the base of the first NPN transistor), the second electronic switch Q2 is turned on, and at this time, the first terminal of the second electronic switch Q2 (i.e., the collector of the first NPN transistor) is at a low level, that is the switching signal output by the switching control module 50 to. If the key switch SW1 is pressed for a time period longer than a first preset time period (e.g. 3 s) and shorter than a second preset time period (e.g. 8 s), the main controller 10 detects that the duration of the low level is longer than the first preset time period and shorter than the second preset time period, and the main controller 10 controls the lcd device to perform the power-on function. After the lcd device enters the power-on state, the main controller 10 outputs a high level control signal to the control terminal of the first electronic switch Q1 (i.e. the gate of the NMOS transistor) through the signal output terminal VCON, the control terminal of the first electronic switch Q1 is at a high level, and the first electronic switch Q1 is turned on, so that the MOS transistor U1 is turned on continuously after the key switch SW1 is released, and the rechargeable battery continuously supplies power to the working load. After the key switch SW1 is released, the second electronic switch Q2 is turned off, the first terminal of the second electronic switch Q2 obtains a bias voltage through the eighth resistor R8, the first terminal of the second electronic switch Q2 is at a high level, and at this time, the power on/off signal detected by the main controller 10 through the power on/off detection terminal VDET1 is at a high level.
When the lcd device is turned on, when the key switch SW1 is pressed, the power supply voltage inputted from the power input terminal VIN is divided by the first resistor R1, the fifth resistor R5 and the sixth resistor R6, and then inputted to the control terminal of the second electronic switch Q2 through the seventh resistor R7, and the second electronic switch Q2 is turned on; and the power supply voltage inputted from the power input terminal VIN is divided by the first resistor R1, the fifth resistor R5 and the sixth resistor R6, and then charges the second capacitor C2 through the ninth resistor R9 and the eleventh resistor R11.
After the second electronic switch Q2 is turned on, the first terminal of the second electronic switch Q2 outputs a low-level on/off signal to the on/off detection terminal VDET1 of the main controller 10, and when the main controller 10 detects that the duration of the low level of the on/off signal through the on/off detection terminal VDET1 is less than a first preset time, the main controller 10 controls the liquid crystal display device to enter a standby state; when the main controller 10 detects that the duration of the low level of the power on/off signal is greater than the first preset time and less than the second preset time through the power on/off detection terminal VDET1, the main controller 10 controls the liquid crystal display device to turn off. When the lcd device is turned off, the control signal outputted from the signal output terminal VCON of the main controller 10 changes from high level to low level, the first electronic switch Q1 is turned off, the MOS transistor U1 is turned off, and the power supply of the rechargeable battery is cut off.
During the charging process of the second capacitor C2, when the voltage at the point B (i.e., the voltage UC2 on the second capacitor C2) does not reach the on-voltage (e.g., 0.7V) of the third electronic switch Q3, the third electronic switch Q3 is turned off, the first terminal of the third electronic switch Q3 (i.e., the collector of the second NPN transistor) obtains the bias voltage through the tenth resistor R10, the first terminal of the third electronic switch Q3 is at a high level, and the reset signal detected by the reset controller 70 through the reset detection terminal VDET2 is at a high level. When the voltage at the point B reaches the turn-on voltage of the third electronic switch Q3, the third electronic switch Q3 is turned on, and the reset signal detected by the reset controller 70 through the reset detection terminal VDET2 is at a low level. In this embodiment, the second preset time is the time from when the second capacitor C2 starts to charge to the time when the third electronic switch Q3 is turned on. Thus, when the key switch SW1 is pressed for a time greater than the second preset time, the third electronic switch Q3 is turned on, the reset controller 70 detects the low level, and controls the liquid crystal display device to be reset.
When the lcd device is in a standby state, the signal output terminal VCON of the main controller 10 outputs a high level control signal, and the first electronic switch Q1 is turned on to control the rechargeable battery to supply power to the working load. When the liquid crystal display device is in a standby state, if the key switch SW1 is pressed, the second electronic switch Q2 is turned on, the power on/off signal output by the power on/off control module 50 is at a low level, and when the main controller 10 detects that the time when the power on/off signal continues to be at the low level through the power on/off detection terminal VDET1 is less than a first preset time, the main controller 10 wakes up the liquid crystal display device, that is, the liquid crystal display device is restored to the power on state from the standby state; when the main controller 10 detects, through the power on/off detection terminal VDET1, that the time during which the power on/off signal continues to be at the low level is longer than the first preset time and shorter than the second preset time, the main controller 10 controls the liquid crystal display device to turn off, that is, the liquid crystal display device enters the power off state from the standby state.
The utility model discloses still provide a liquid crystal display equipment, this liquid crystal display equipment include rechargeable battery, work load and power management circuit, and above-mentioned embodiment is all referred to this power management circuit's structure, theory of operation and the beneficial effect who brings, and here is no longer repeated.
The above only is the preferred embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent flow changes made by the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the same way in the protection scope of the present invention.
Claims (10)
1. A power supply management circuit is respectively connected with a rechargeable battery and a working load and is characterized by comprising a main controller, a power supply input end, a power supply output end, a switch module, a first switch control module, a second switch control module, a reset control module and a reset controller;
the input end of the switch module is connected with the rechargeable battery through the power supply input end, and the output end of the switch module is connected with the working load through the power supply output end; the input end of the first switch control module is connected with the signal output end of the main controller, and the output end of the first switch control module is connected with the control end of the switch module; the input end of the second switch control module is connected with the control end of the switch module, and the output end of the second switch control module is respectively connected with the input end of the switch control module and the input end of the reset control module; the output end of the on-off control module is connected with the on-off detection end of the main controller, and the output end of the reset control module is connected with the reset detection end of the reset controller.
2. The power management circuit according to claim 1, wherein the switch module comprises a MOS transistor and a first resistor connected between a source and a gate of the MOS transistor;
the source electrode of the MOS tube is connected with the power input end, the grid electrode of the MOS tube is respectively connected with the output end of the first switch control module and the input end of the second switch control module, and the drain electrode of the MOS tube is connected with the power output end.
3. The power management circuit of claim 2 wherein the MOS transistor is a PMOS transistor having 8 pins, the PMOS transistor comprising a gate, three interconnected sources, and four interconnected drains.
4. The power management circuit according to claim 2 or 3, wherein the first switch control module comprises a first electronic switch, a second resistor, a third resistor, a fourth resistor, and a first capacitor;
one end of the second resistor is connected with a signal output end of the main controller, the other end of the second resistor is connected with a control end of the first electronic switch and is grounded through the third resistor, and the first capacitor is connected with the third resistor in parallel; the first end of the first electronic switch is connected with the grid electrode of the MOS tube through the fourth resistor, and the second end of the first electronic switch is grounded.
5. The power management circuit according to claim 4, wherein the second switch control module comprises a key switch, a fifth resistor, a sixth resistor and a voltage regulator tube;
one end of the key switch is connected with the grid electrode of the MOS tube, and the other end of the key switch is grounded through the fifth resistor and the sixth resistor in sequence; the cathode of the voltage-stabilizing tube is connected with the common end of the fifth resistor and the sixth resistor, and the anode of the voltage-stabilizing tube is grounded; and the common end of the fifth resistor and the sixth resistor is connected with the input end of the on-off control module and the input end of the reset control module.
6. The power management circuit according to claim 5, wherein the switch control module comprises a second electronic switch, a seventh resistor, and an eighth resistor;
the control end of the second electronic switch is connected with the common end of the fifth resistor and the sixth resistor through the seventh resistor, the first end of the second electronic switch is connected with the startup and shutdown detection end of the main controller, the eighth resistor is connected with a power supply end, and the second end of the second electronic switch is grounded.
7. The power management circuit of claim 6, wherein the reset control module comprises a third electronic switch, a ninth resistor, a tenth resistor, a second capacitor, and a third capacitor;
the control end of the third electronic switch is connected with the common end of the fifth resistor and the sixth resistor through the ninth resistor, the first end of the third electronic switch is connected with the reset detection end of the reset controller and is connected with the power supply end through the tenth resistor, and the second end of the third electronic switch is grounded;
one end of the second capacitor is connected with the control end of the third electronic switch, and the other end of the second capacitor is grounded; one end of the third capacitor is connected with the first end of the third electronic switch, and the other end of the third capacitor is grounded.
8. The power management circuit of claim 7 wherein the voltage at the supply terminal is 3.3V.
9. The power management circuit according to claim 8, wherein the first electronic switch is an NMOS transistor, a gate of the NMOS transistor is a control terminal of the first electronic switch, a drain of the NMOS transistor is a first terminal of the first electronic switch, and a source of the NMOS transistor is a second terminal of the first electronic switch;
the second electronic switch is a first NPN triode, the base electrode of the first NPN triode is the control end of the second electronic switch, the collector electrode of the first NPN triode is the first end of the second electronic switch, and the emitter electrode of the first NPN triode is the second end of the second electronic switch;
the third electronic switch is a second NPN triode, a base of the second NPN triode is a control terminal of the third electronic switch, a collector of the second NPN triode is a first terminal of the third electronic switch, and an emitter of the second NPN triode is a third terminal of the third electronic switch.
10. A liquid crystal display device comprising a rechargeable battery and a work load, characterized by further comprising a power management circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420093546.1U CN203788004U (en) | 2014-03-03 | 2014-03-03 | Power supply management circuit and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420093546.1U CN203788004U (en) | 2014-03-03 | 2014-03-03 | Power supply management circuit and liquid crystal display device |
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| Publication Number | Publication Date |
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| CN203788004U true CN203788004U (en) | 2014-08-20 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420093546.1U Expired - Fee Related CN203788004U (en) | 2014-03-03 | 2014-03-03 | Power supply management circuit and liquid crystal display device |
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| CN (1) | CN203788004U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108901061A (en) * | 2018-05-31 | 2018-11-27 | 深圳市文鼎创数据科技有限公司 | A kind of NFC device |
| CN113625856A (en) * | 2021-07-26 | 2021-11-09 | 上海金卓科技有限公司 | Switching on and shutting down circuit and electronic equipment |
| CN114333656A (en) * | 2021-12-10 | 2022-04-12 | 北京镁伽科技有限公司 | Power supply self-checking system, adjustable voltage source and image signal generator |
| CN114675732A (en) * | 2022-03-15 | 2022-06-28 | 深圳市豪恩声学股份有限公司 | Reset circuit, electronic equipment and reset system |
-
2014
- 2014-03-03 CN CN201420093546.1U patent/CN203788004U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108901061A (en) * | 2018-05-31 | 2018-11-27 | 深圳市文鼎创数据科技有限公司 | A kind of NFC device |
| CN113625856A (en) * | 2021-07-26 | 2021-11-09 | 上海金卓科技有限公司 | Switching on and shutting down circuit and electronic equipment |
| CN114333656A (en) * | 2021-12-10 | 2022-04-12 | 北京镁伽科技有限公司 | Power supply self-checking system, adjustable voltage source and image signal generator |
| CN114333656B (en) * | 2021-12-10 | 2023-12-12 | 北京镁伽科技有限公司 | Power self-checking system, adjustable voltage source and image signal generator |
| CN114675732A (en) * | 2022-03-15 | 2022-06-28 | 深圳市豪恩声学股份有限公司 | Reset circuit, electronic equipment and reset system |
| CN114675732B (en) * | 2022-03-15 | 2023-12-12 | 深圳市豪恩声学股份有限公司 | Reset circuit, electronic equipment and reset system |
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