CN115357108A - AM335x discrete power supply power-on and power-off time sequence control circuit and method - Google Patents
AM335x discrete power supply power-on and power-off time sequence control circuit and method Download PDFInfo
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- CN115357108A CN115357108A CN202210771074.XA CN202210771074A CN115357108A CN 115357108 A CN115357108 A CN 115357108A CN 202210771074 A CN202210771074 A CN 202210771074A CN 115357108 A CN115357108 A CN 115357108A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
- G06F1/26—Power supply means, e.g. regulation thereof
- G06F1/28—Supervision thereof, e.g. detecting power-supply failure by out of limits supervision
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The invention discloses an AM335x discrete power supply power-on and power-off time sequence control circuit and a method, wherein the time sequence control circuit comprises a power supply; the conversion circuit is used for converting a power supply into direct-current voltages of +1.8V, +1.5V, +3.3V, +1.325V and +1.1V and supplying power to the AM335x processor; the input end of the power supply monitoring circuit is connected with the output end of the power supply, and the output end of the power supply monitoring circuit is connected with the conversion circuit through the delay circuit; and the input end of the reset voltage monitoring circuit is connected with the output end of the power supply, and the output end of the reset voltage monitoring circuit is connected with the reset end of the AM335x processor. The AM335x processor is powered by the discrete power supply, the power-up and power-down time sequence required by the AM335x processor is realized, a plurality of alternative schemes are provided, and the cost is reduced.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to an AM335x discrete power supply power-on and power-off time sequence control circuit and method.
Background
The currently common method for supplying power to the AM335x processor is to use a power management chip recommended by TI (texas instruments) for supplying power, so that a single chip can provide multiple paths of required power and power-on and power-off time sequences. However, this method has few alternatives, high total material cost, and the risk of no alternatives or cost runaway due to material shortage.
Disclosure of Invention
The invention aims to provide an AM335x discrete power supply power-on and power-off time sequence control circuit and a method, which supply power to an AM335x processor through a discrete power supply, reduce material cost and have multiple substitutable schemes.
In order to achieve the above object, a first aspect of the present invention discloses an AM335x discrete power supply power-on and power-off timing control circuit, which includes:
a power source;
the conversion circuit comprises a first conversion circuit, a second conversion circuit, a third conversion circuit, a fourth conversion circuit and a fifth conversion circuit, and is used for converting the power supply into direct-current voltages of +1.8V, +1.5V, +3.3V, +1.325V and +1.1V respectively to supply power to the AM335x processor;
the input end of the power supply monitoring circuit is connected with the output end of the power supply, the output end of the power supply monitoring circuit is connected with the conversion circuit through a delay circuit, and the power supply monitoring circuit is used for driving the conversion circuit to sequentially output direct currents of +1.8V, +1.5V and +3.3V when the power supply is powered on, then driving the conversion circuit to simultaneously output direct voltages of +1.325V and +1.1V, powering on the AM335x processor, driving the +1.1V and +1.325V outputted by the conversion circuit to simultaneously power down when the power supply voltage is lower than a first preset threshold value, and then driving the +3.3V, +1.5V and +1.8V outputted by the conversion circuit to sequentially power down;
the reset voltage monitoring circuit, the input of reset voltage monitoring circuit with the output of power links to each other, the output of reset voltage monitoring circuit with the reset end of AM335x treater links to each other, is used for in the electricity-on process of AM335x treater, or when mains voltage is less than the second threshold value that predetermines, control the reset end of AM335x treater is in low level state all the time.
As an optional implementation manner, in the first aspect of the present invention, the power supply monitoring circuit includes a voltage detection chip, a first delay circuit, a second delay circuit, and a third delay circuit;
the input end of the voltage detection chip is connected to the output end of the power supply, and the output end of the voltage detection chip is connected to the first delay circuit, the second delay circuit and the third delay circuit;
the enable terminal of the first converting circuit is also connected to the output terminal of the power supply, the output terminal of the first converting circuit is connected to the enable terminal of the second converting circuit through the first delay circuit, the output terminal of the second converting circuit is connected to the enable terminal of the third converting circuit through the second delay circuit, and the output terminal of the third converting circuit is connected to the enable terminals of the fourth converting circuit and the fifth converting circuit through the third delay circuit.
As an optional implementation manner, in the first aspect of the present invention, the first delay circuit includes a first resistor and a first capacitor, the second delay circuit includes a second resistor and a second capacitor, and the third delay circuit includes a third resistor and a third capacitor; the power supply monitoring circuit further comprises a first diode, a fourth resistor, a second diode, a fifth resistor, a third diode and a sixth resistor;
the output end of the first conversion circuit is grounded through a first resistor and a first capacitor, the cathode of the first diode is connected to the output end of the voltage detection chip, the anode of the first diode is connected between the first resistor and the first capacitor through a fourth resistor, and the enable end of the second conversion circuit is connected between the first resistor and the first capacitor;
the output end of the second conversion circuit is grounded through a second resistor and a second capacitor, the cathode of the second diode is connected to the output end of the voltage detection chip, the anode of the second diode is connected between the second resistor and the second capacitor through a fifth resistor, and the enable end of the third conversion circuit is connected between the second resistor and the second capacitor;
the output end of the third conversion circuit is grounded through a third resistor and a third capacitor, the cathode of the third diode is connected to the output end of the voltage detection chip, the anode of the third diode is connected between the third resistor and the third capacitor through a sixth resistor, and the enabling ends of the fourth conversion circuit and the fifth conversion circuit are both connected between the third resistor and the third capacitor.
As an optional implementation manner, in the first aspect of the present invention, each of the first converting circuit, the second converting circuit, the third converting circuit, the fourth converting circuit, and the fifth converting circuit includes a transforming chip, an inductor, a fourth capacitor, and a voltage dividing circuit; the input end of the transformation chip is connected to the output end of the power supply, the output end of the transformation chip forms the output end of the corresponding transformation circuit after passing through the inductor, one end of the fourth capacitor and one end of the voltage division circuit are connected to the output end of the corresponding transformation circuit, and one end of the fourth capacitor and one end of the voltage division circuit are connected to the feedback end of the transformation chip; the enabling ends of the transformation chips corresponding to the first transformation circuit are connected to the output end of the power supply, the enabling ends of the transformation chips corresponding to the second transformation circuit and the third transformation circuit are connected to the output ends of the first transformation circuit and the second transformation circuit through a first delay circuit and a second delay circuit respectively, and the enabling ends of the transformation chips corresponding to the fourth transformation circuit and the fifth transformation circuit are connected to the output end of the third transformation circuit through a third delay circuit.
As an optional implementation manner, in the first aspect of the present invention, each of the first converting circuit, the second converting circuit, the third converting circuit, the fourth converting circuit and the fifth converting circuit includes a first filter circuit and a second filter circuit, wherein the first filter circuit is connected between the transformer chip and the power supply, and the second filter circuit is connected between the transformer chip and the output end of the corresponding converting circuit.
As an optional implementation manner, in the first aspect of the present invention, the voltage dividing circuit includes a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected between the inductor and the output terminal of the corresponding converting circuit, the other end of the first voltage dividing resistor is grounded through the second voltage dividing resistor, and the feedback terminal of the transforming chip is connected between the first voltage dividing resistor and the second voltage dividing resistor.
As an optional implementation manner, in the first aspect of the present invention, the reset voltage monitoring circuit includes a reset monitoring chip with a delay, a seventh resistor, an eighth resistor, and a fifth capacitor, a power supply end of the reset monitoring chip is connected to an output end of the power supply, an output end of the reset monitoring chip is connected to a reset end of the AM335x processor, one end of each of the seventh resistor and the eighth resistor is connected to the output end of the reset monitoring chip, one end of each of the seventh resistor and the eighth resistor is connected to the output ends of the third converting circuit and the first converting circuit, one end of the fifth capacitor is connected to the output end of the reset monitoring chip, and the other end of the fifth capacitor is grounded.
The second aspect of the present invention discloses a method for implementing power-on timing control of an AM335x by using the power-on and power-off timing control circuit of the AM335x discrete power supply of the first aspect of the present invention, which includes the following steps:
the power supply monitoring circuit detects the change of power supply voltage in real time, when the power supply is powered on, the power supply monitoring circuit drives the conversion circuit to sequentially output direct current of +1.8V, +1.5V and +3.3V, then drives the conversion circuit to simultaneously output direct current voltage of +1.325V and +1.1V, and powers on the AM335x processor; when the power supply voltage is lower than a first preset threshold value, driving +1.1V and +1.325V output by the conversion circuit to be powered down simultaneously, and then driving +3.3V, +1.5V and +1.8V output by the conversion circuit to be powered down sequentially;
the reset voltage monitoring circuit detects the change of the power supply voltage in real time, and controls the reset end of the AM335x processor to be always in a low level state in the power-on process of the AM335x processor or when the power supply voltage is lower than a second preset threshold value.
As an optional implementation manner, in the second aspect of the present invention, the reset voltage monitoring circuit has a delay function, and in a power-on process of the AM335x processor, the reset voltage monitoring circuit delays for a first preset time and outputs a high level to the reset end of the AM335x processor, where the first preset time is greater than or equal to a time when the conversion circuit sequentially outputs dc voltages of +1.8V, +1.5V, +3.3V, +1.325V, and +1.1V as the power-on time of the AM335x processor; and when the power supply voltage is lower than a second preset threshold value, the reset voltage monitoring circuit directly outputs a low level.
As an optional implementation manner, in the second aspect of the present invention, when the power supply is powered on, the power supply monitoring circuit drives the conversion circuit to sequentially output dc voltages of +1.8V, +1.5V, +3.3V, and then drives the conversion circuit to simultaneously output dc voltages of +1.325V and +1.1V, so as to power on the AM335x processor, including:
when the power supply is powered on, the power supply drives a first conversion circuit to directly power on +1.8V for the AM335x processor;
the first conversion circuit enables a second conversion circuit to realize the power-on of +1.5V for the AM335x processor after delaying for a second preset time through a first delay circuit;
the second conversion circuit enables a third conversion circuit to realize the power-on of +3.3V for the AM335x processor after delaying for a third preset time through a second delay circuit;
and the third conversion circuit enables the fourth conversion circuit and the fifth conversion circuit to realize the electrification of +1.325V and +1.1V for the AM335x processor after delaying for a fourth preset time through the third delay circuit.
Compared with the prior art, the invention has the beneficial effects that:
the AM335x processor is powered by the discrete power supply composed of the power supply, the power supply monitoring circuit, the conversion circuit and the reset monitoring chip, the power-on and power-off time sequence required by the AM335x processor is realized, the AM335x processor can be realized by using common discrete devices, a PMIC integrated power supply scheme can be replaced, the discrete scheme has the problems of multiple chip supply replacement models and short supply period, the total material cost has obvious advantages, and the cost reduction is facilitated.
Drawings
FIG. 1 is a schematic block diagram of the circuit of the AM335x discrete power supply power-on and power-off timing control circuit of the present invention;
FIG. 2 is a circuit schematic of the power supply of the present invention;
FIG. 3 is a schematic circuit diagram of the power monitoring circuit of the present invention;
FIG. 4 is a circuit schematic of a first conversion circuit of the present invention;
FIG. 5 is a circuit schematic of a second conversion circuit of the present invention;
FIG. 6 is a circuit schematic of a third conversion circuit of the present invention;
FIG. 7 is a circuit schematic of a fourth conversion circuit of the present invention;
FIG. 8 is a schematic circuit diagram of a fifth inverter circuit according to the present invention;
fig. 9 is a circuit schematic diagram of the reset voltage monitoring circuit of the present invention.
Detailed Description
The present invention is further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the case of no conflict, any combination between the embodiments or technical features described below may form a new embodiment. Except as specifically noted, the materials and equipment used in this example are commercially available. Examples of embodiments are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present application and are not to be construed as limiting the present application.
In the description of the present application, it is to be understood that the terms "upper", "lower", "front", "back", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present application and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present application. In the description of this application, "plurality" means two or more unless specifically stated otherwise.
In the description of the present application, it should be noted that unless otherwise specifically stated or limited, the terms "connected," "communicating," and "connecting" are to be construed broadly, e.g., as meaning fixedly connected, connected through an intervening medium, connected internally between two elements, or in an interactive relationship between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
The terms "comprises" and "comprising," and any variations thereof, in the description and claims of this application and the above-described drawings, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example one
The embodiment one of the invention discloses an AM335x discrete power supply power-on and power-off timing control circuit, wherein an AM335x processor is an AM335 series microprocessor based on an ARM Cortex-A8 kernel of American TI (Texas instruments) company, and comprises processors such as AM3352, AM3354, AM3356, AM3357 and AM3358AM 3359.
Referring to fig. 1, a circuit for controlling power-up and power-down timing of an AM335x discrete power supply mainly includes a power supply 10, a conversion circuit 20, a power monitoring circuit 30, and a reset voltage monitoring circuit 50, where the power supply is used to supply power to an AM335x processor 40, and the conversion circuit, the power monitoring circuit, and the reset voltage monitoring circuit implement power-up and power-down timing of the AM335x processor.
The power supply may be a +5V dc power supply, or may be a dc power supply of other value, or a dc power supply that converts ac power into +5V or other value through a rectifier circuit, a filter circuit, a voltage-reducing circuit, or the like.
Referring to fig. 2, the power supply 10 uses a +5V dc power supply, and the +5V dc power supply outputs a +5V dc voltage through a filter circuit formed by a switch SW1, a zener diode D1, and capacitors C1 and C2.
The conversion circuit 20 is used to form the +1.8V, +1.5V, +3.3V, +1.325V and +1.1V dc voltage signals required by the AM335x processor.
The conversion circuit 20 includes a first conversion circuit 21, a second conversion circuit 22, a third conversion circuit 23, a fourth conversion circuit 24, and a fifth conversion circuit 25, which are used to convert the power supply into dc voltages of +1.8V, +1.5V, +3.3V, +1.325V, and +1.1V, respectively, to supply power to the AM335x processor. It should be noted that, the first converting circuit, the second converting circuit, the third converting circuit, the fourth converting circuit, and the fifth converting circuit may be directly connected to a power source terminal of the AM335x processor as needed to supply power to the AM335x processor, or a peripheral circuit of the AM335x processor may need one of the above dc voltages, so as to connect an output terminal of the corresponding converting circuit to the peripheral circuit of the AM335x processor.
The power supply monitoring circuit is matched with a power supply and the conversion circuit, so that when the power supply is powered on, the conversion circuit is driven to sequentially output direct-current voltages of +1.8V, +1.5V, +3.3V, +1.325V and +1.1V (+ 1.325V and +1.1V, the same expression meaning is shown below when the direct-current voltages are powered on at the same time, the AM335x processor is powered on, and when the power supply voltage is lower than a first preset threshold value, the direct-current voltages of +1.1V, +1.325V (+ 1.325V and +1.1V, which are output by the conversion circuit, are powered off at the same time, and the expression meaning is shown below, the direct-current voltages of +3.3V, +1.5V and +1.8V are powered off sequentially.
Specifically, referring to fig. 3, the power monitoring circuit includes a power monitoring circuit including a voltage detecting chip U8, an auxiliary circuit, a first delay circuit, a second delay circuit, and a third delay circuit.
The voltage detection chip U8 can be an LN61CN4302 type chip, certainly, can also be built by other chips, the input end (VIN) of the voltage detection chip U8 is connected to the power supply 10, the ground terminal (GND) of the voltage detection chip U8 is grounded, meanwhile, a resistor R40 is connected between the input end and the output end (OUT) of the voltage detection chip U8, and a filter capacitor C40 is connected between the input end and the ground terminal of the voltage detection chip U8.
The auxiliary circuit comprises a first diode D2, a fourth resistor R7, a second diode D3, a fifth resistor R9, a third diode D4 and a sixth resistor R33. The first delay circuit includes a first resistor R6 and a first capacitor C10, the second delay circuit includes a second resistor R8 and a second capacitor C11, and the third delay circuit includes a third resistor R34 and a third capacitor C39.
The input end of the voltage detection chip U8 is connected to the output end of the power supply 10, and the output end of the voltage detection chip U8 is connected to the first delay circuit, the second delay circuit and the third delay circuit through the auxiliary circuit.
Referring to fig. 4-8, the enable terminal of the first converting circuit is also connected to the output terminal of the power supply, the output terminal of the first converting circuit is connected to the enable terminal of the second converting circuit through the first delay circuit, the output terminal of the second converting circuit is connected to the enable terminal of the third converting circuit through the second delay circuit, and the output terminal of the third converting circuit is connected to the enable terminals of the fourth converting circuit and the fifth converting circuit through the third delay circuit.
Specifically, the output end of the first conversion circuit is grounded through a first resistor and a first capacitor, the cathode of the first diode is connected to the output end of the voltage detection chip, the anode of the first diode is connected between the first resistor and the first capacitor through a fourth resistor, and the enable end of the second conversion circuit is connected between the first resistor and the first capacitor.
The output end of the second conversion circuit is grounded through a second resistor and a second capacitor, the cathode of a second diode is connected to the output end of the voltage detection chip, the anode of the second diode is connected between the second resistor and the second capacitor through a fifth resistor, and the enable end of a third conversion circuit is connected between the second resistor and the second capacitor;
the output end of the third conversion circuit is grounded through a third resistor and a third capacitor, the cathode of a third diode is connected to the output end of the voltage detection chip, the anode of the third diode is connected between the third resistor and the third capacitor through a sixth resistor, and the enabling ends of the fourth conversion circuit and the fifth conversion circuit are connected between the third resistor and the third capacitor.
From the above, when the power supply is powered on, the voltage detection chip U8 outputs a high level: the power supply directly enables the first conversion circuit, pulls up the EN pin of the first conversion circuit, namely, the first conversion circuit is enabled by default, so that the +1.8V corresponding to the first conversion circuit is powered on by the AM355x at the earliest time. The first conversion circuit outputs a +1.8V direct-current voltage, after an RC delay circuit formed by a first resistor and a first capacitor delays for a certain time (namely a second preset time, determined according to relevant parameters of the RC delay circuit), an EN pin of the second conversion circuit is pulled high, so that a +1.5V second corresponding to the second conversion circuit is powered on by an AM355x, and similarly, the +3.3V, +1.1V and 1.325V power supply enabling is realized by the second delay circuit and a third delay circuit in succession, wherein 1.1V and 1.325V share one enabling signal, and further, the +1.8V, +1.5V, +3.3V, +1.325V and +1.1V power-on sequence control is realized.
When the power supply is powered off, the voltage detection chip U8 firstly monitors the voltage drop of the power supply, when the power supply voltage is smaller than a first preset voltage value, the output end of the voltage detection chip U8 is at a low level, and the charge discharge speeds of the third capacitor C39, the second capacitor C11 and the first capacitor C10 are respectively controlled through the resistance values of the third resistor R34, the second resistor R8 and the first resistor R6, so that the enabling ends of the fifth conversion circuit and the fourth conversion circuit are powered off firstly, the enabling ends of the third conversion circuit and the second conversion circuit are powered off successively, and the power-off sequence control of +1.1V, +1.325V, +3.3V, +1.5V and +1.8V is realized.
The five conversion circuits may adopt the same circuit structure, for example, the first conversion circuit, the second conversion circuit, the third conversion circuit, the fourth conversion circuit and the fifth conversion circuit each include a transformation chip, an inductor, a fourth capacitor and a voltage division circuit; the input end of each voltage transformation chip is connected to the output end of the power supply, the output end of each voltage transformation chip forms the output end of the corresponding transformation circuit after passing through the inductor, one end of each fourth capacitor and one end of each voltage division circuit are connected to the output end of the corresponding transformation circuit, and one end of each fourth capacitor and one end of each voltage division circuit are connected to the feedback end of the voltage transformation chip; the enabling ends of the transformation chips corresponding to the first transformation circuit are connected to the output end of the power supply, the enabling ends of the transformation chips corresponding to the second transformation circuit and the third transformation circuit are respectively connected to the output ends of the first transformation circuit and the second transformation circuit, and the enabling ends of the transformation chips corresponding to the fourth transformation circuit and the fifth transformation circuit are both connected to the output end of the third transformation circuit.
The output values of the five conversion circuits are adjusted through corresponding voltage division circuits. Meanwhile, a first filter circuit and a second filter circuit are respectively arranged in front of and behind the voltage detection chip of each conversion circuit, so that the stability of voltage is ensured.
Specifically, the method comprises the following steps:
referring to fig. 4, the first conversion circuit 21 includes a voltage detection chip U1, a capacitor C5, a capacitor C6, a resistor R1, a capacitor C9, a capacitor C3, an inductor L1, a voltage dividing resistor R4, a voltage dividing resistor R5, a capacitor C4, a capacitor C7, and a capacitor C8. The capacitor C5 and the capacitor C6 are connected IN parallel to form a first filter circuit of the first conversion circuit, one end of the first filter circuit is connected to the output end of the power supply, the other end of the first filter circuit is grounded, the input end (IN) of the voltage detection chip U1 is connected to the output end of the power supply, the enable End (EN) of the voltage detection chip U1 is connected to the output end of the power supply through the resistor R1, one end of the capacitor C9 is grounded, the other end of the capacitor C9 is connected between the resistor R1 and the enable end of the voltage detection chip U1, the output end (LX) of the voltage detection chip U1 forms the output end (VDD _1V 8) of the first conversion circuit after passing through the inductor L1, and outputs a direct-current voltage of + 1.8V; the feedback end (FB) of the voltage detection chip U1 is connected to the output end of the first conversion circuit through the divider resistor R4, the capacitor C3 is connected to the two ends of the divider resistor R4 in parallel, one end of the divider resistor R5 is grounded, and the other end of the divider resistor R5 is connected between the feedback end of the voltage detection chip U1 and the divider resistor R4. And the capacitor C4, the capacitor C7 and the capacitor C8 are connected in parallel to form a second filter circuit, one end of the second filter circuit is connected between the inductor L1 and the output end of the first conversion circuit, and the other end of the second filter circuit is grounded.
Referring to fig. 5, the second conversion circuit 22 includes a voltage detection chip U2, a capacitor C12, a capacitor C13, a capacitor C15, an inductor L2, a voltage dividing resistor R12, a voltage dividing resistor R13, a capacitor C14, a capacitor C16, and a capacitor C17. The capacitor C12 and the capacitor C13 are connected IN parallel to form a first filter circuit of the second conversion circuit, one end of the first filter circuit is connected to the output end of the power supply, the other end of the first filter circuit is grounded, the input end (IN) of the voltage detection chip U2 is connected to the output end of the power supply, the enable End (EN) of the voltage detection chip U2 is connected among the resistor R6, the resistor R7 and the capacitor C10, the output end (LX) of the voltage detection chip U2 forms the output end (VDD _1V 5) of the second conversion circuit after passing through the inductor L2, and the output end outputs +1.5V direct-current voltage; the feedback end (FB) of the voltage detection chip U2 is connected to the output end of the second conversion circuit through a voltage dividing resistor R12, a capacitor C15 is connected to two ends of the voltage dividing resistor R12 in parallel, one end of the voltage dividing resistor R13 is grounded, and the other end of the voltage dividing resistor R13 is connected between the feedback end of the voltage detection chip U2 and the voltage dividing resistor R12. And the capacitor C14, the capacitor C16 and the capacitor C17 are connected in parallel to form a second filter circuit, one end of the second filter circuit is connected between the inductor L2 and the output end of the second conversion circuit, and the other end of the second filter circuit is grounded.
Referring to fig. 6, the third converting circuit 23 includes a voltage detecting chip U4, a capacitor C20, a capacitor C21, a capacitor C22, an inductor L3, a voltage dividing resistor R20, a voltage dividing resistor R22, a capacitor C23, a capacitor C24, and a capacitor C25. The capacitor C20 and the capacitor C21 are connected IN parallel to form a first filter circuit of the third conversion circuit, one end of the first filter circuit is connected to the output end of the power supply, the other end of the first filter circuit is grounded, the input end (IN) of the voltage detection chip U4 is connected to the output end of the power supply, the enable End (EN) of the voltage detection chip U4 is connected among the resistor R8, the resistor R9 and the capacitor C11, the output end (LX) of the voltage detection chip U4 forms the output end (VDD _3V 3) of the third conversion circuit after passing through the inductor L3, and +3.3V direct-current voltage is output; the feedback end (FB) of the voltage detection chip U4 is connected to the output end of the third conversion circuit through a voltage dividing resistor R20, a capacitor C22 is connected to two ends of the voltage dividing resistor R20 in parallel, one end of the voltage dividing resistor R21 is grounded, and the other end of the voltage dividing resistor R21 is connected between the feedback end of the voltage detection chip U4 and the voltage dividing resistor R20. And the capacitor C23, the capacitor C24 and the capacitor C25 are connected in parallel to form a second filter circuit, one end of the second filter circuit is connected between the inductor L3 and the output end of the third conversion circuit, and the other end of the second filter circuit is grounded.
Referring to fig. 7, the fourth conversion circuit 24 includes a voltage detection chip U5, a capacitor C27, a capacitor C28, a capacitor C30, an inductor L4, a voltage dividing resistor R26, a voltage dividing resistor R28, a capacitor C29, a capacitor C31, and a capacitor C32. The capacitor C27 and the capacitor C28 are connected IN parallel to form a first filter circuit of the fourth conversion circuit, one end of the first filter circuit is connected to the output end of the power supply, the other end of the first filter circuit is grounded, the input end (IN) of the voltage detection chip U5 is connected to the output end of the power supply, the enable End (EN) of the voltage detection chip U5 is connected among the resistor R34, the resistor R33 and the capacitor C39, the output end (LX) of the voltage detection chip U5 forms the output end (VDD _1V 325) of the fourth conversion circuit after passing through the inductor L4, and +1.325V direct-current voltage is output; the feedback end (FB) of the voltage detection chip U5 is connected to the output end of the fourth conversion circuit through the voltage dividing resistor R26, the capacitor C30 is connected in parallel to the two ends of the voltage dividing resistor R26, one end of the voltage dividing resistor R28 is grounded, and the other end is connected between the feedback end of the voltage detection chip U5 and the voltage dividing resistor R26. And the capacitor C29, the capacitor C31 and the capacitor C32 are connected in parallel to form a second filter circuit, one end of the second filter circuit is connected between the inductor L4 and the output end of the fourth conversion circuit, and the other end of the second filter circuit is grounded.
Referring to fig. 8, the fifth converting circuit 25 includes a voltage detecting chip U6, a capacitor C33, a capacitor C34, a capacitor C36, an inductor L5, a voltage dividing resistor R31, a voltage dividing resistor R32, a capacitor C35, a capacitor C37, and a capacitor C38. The capacitor C33 and the capacitor C34 are connected IN parallel to form a first filter circuit of the fifth conversion circuit, one end of the first filter circuit is connected to the output end of the power supply, the other end of the first filter circuit is grounded, the input end (IN) of the voltage detection chip U6 is connected to the output end of the power supply, the enable End (EN) of the voltage detection chip U6 is connected among the resistor R34, the resistor R33 and the capacitor C39, the output end (LX) of the voltage detection chip U6 forms the output end (VDD _1V 1) of the third conversion circuit after passing through the inductor L5, and outputs a direct current voltage of + 1.1V; the feedback end (FB) of the voltage detection chip U6 is connected to the output end of the fifth conversion circuit through a voltage dividing resistor R31, a capacitor C36 is connected to two ends of the voltage dividing resistor R31 in parallel, one end of the voltage dividing resistor R32 is grounded, and the other end of the voltage dividing resistor R32 is connected between the feedback end of the voltage detection chip U6 and the voltage dividing resistor R31. And the capacitor C35, the capacitor C37 and the capacitor C38 are connected in parallel to form a second filter circuit, one end of the second filter circuit is connected between the inductor L5 and the output end of the fifth conversion circuit, and the other end of the second filter circuit is grounded.
The input end of the reset voltage monitoring circuit is connected with the output end of the power supply, and the output end of the reset voltage monitoring circuit is connected with the reset end of the AM335x processor, so that the reset end of the AM335x processor is controlled to be always in a low level state in the power-on process of the AM335x processor or when the power supply voltage is lower than a second preset threshold value.
Referring to fig. 9, the reset voltage monitoring circuit includes a reset monitoring chip U3 with delay, a seventh resistor R14, an eighth resistor R35, and a fifth capacitor C19, where the reset monitoring chip is a MAX803SQ438T1G type chip, and the delay time is long and can reach 200ms, so that the power reset signal can be controlled to be always in a low level state in the power-on process of the power supply, and when the power voltage is lower than a second preset threshold, for example, 4.3V, the output terminal (pin 2) of the reset monitoring chip is pulled down, so that the power reset signal is controlled to be always in a low level state in the power-off process of the power supply.
The power end of the reset monitoring chip U3 is connected to the output end of the power supply, the output end of the reset monitoring chip U3 is connected to the reset end of the AM335x processor, and the power end of the reset monitoring chip U3 is also connected with the grounding end of the reset monitoring chip U3 through a filter capacitor C18 and is used for filtering power supply signals. One end of the seventh resistor R14 and one end of the eighth resistor R35 are both connected to the output end of the reset monitoring chip, one end of the seventh resistor R14 and one end of the eighth resistor R35 are connected to the output ends of the third converting circuit and the first converting circuit respectively, one end of the fifth capacitor C19 is connected to the output end of the reset monitoring chip, and the other end of the fifth capacitor C19 is grounded.
Example two
The second embodiment discloses a method for controlling the power-on and power-off time sequence of an AM335x discrete power supply, which comprises the following steps:
the power supply monitoring circuit detects the change of the power supply voltage in real time, when the power supply is electrified, the power supply monitoring circuit drives the conversion circuit to sequentially output direct-current voltages of +1.8V, +1.5V, +3.3V, +1.325V and +1.1V, and the direct-current voltages are electrified for the AM335x processor; when the power supply voltage is lower than a first preset threshold value, the +1.1V, +1.325V, +3.3V, +1.5V and +1.8V output by the driving conversion circuit are powered down in sequence;
the reset voltage monitoring circuit detects the change of the power supply voltage in real time, and controls the reset end of the AM335x processor to be always in a low level state in the power-on process of the AM335x processor or when the power supply voltage is lower than a second preset threshold value.
In the process of powering on the AM335x processor, the reset voltage monitoring circuit outputs a high level to a reset end of the AM335x processor after delaying for a first preset time, wherein the length of the first preset time is greater than or equal to the time when the conversion circuit sequentially outputs +1.8V, +1.5V, +3.3V, +1.325V and +1.1V direct-current voltages which are the time when the AM335x processor is powered on; when the power supply voltage is lower than a second preset threshold value, the reset voltage monitoring circuit directly outputs a low level.
When the power supply is powered on, the power supply monitoring circuit drives the conversion circuit to sequentially output direct-current voltages of +1.8V, +1.5V, +3.3V, +1.325V and +1.1V, and the power supply monitoring circuit is used for powering on an AM335x processor and comprises the following steps:
when the power supply is powered on, the power supply drives the first conversion circuit to directly power on +1.8V for the AM335x processor;
the first conversion circuit enables the second conversion circuit to realize the power-on of +1.5V for the AM335x processor after delaying for a second preset time through the first delay circuit;
the second conversion circuit enables the third conversion circuit to realize the power-on of +3.3V for the AM335x processor after delaying for a third preset time through the second delay circuit;
the third conversion circuit enables the fourth conversion circuit and the fifth conversion circuit to be powered on by +1.325V and +1.1V for the AM335x processor after delaying for a fourth preset time through the third delay circuit.
It can be understood that: the first preset time is greater than the sum of the second preset time, the third preset time and the fourth preset time, so that direct-current voltages of +1.8V, +1.5V, +3.3V, +1.325V and +1.1V are guaranteed, and after the AM335x processor is electrified in sequence, the reset end of the AM335x processor is in a high level state, namely in the electrifying process of the AM335x processor, the reset end of the AM335x processor is continuously in a low level state.
And in the power-off process of the power supply, the +1.1V, +1.325V, +3.3V, +1.5V and +1.8V are sequentially powered off through the charge discharge speed of the capacitors of the three delay circuits.
Finally, it should be noted that: the above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention should not be limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.
Claims (10)
1. An AM335x discrete power supply power-on and power-off timing control circuit, comprising:
a power source;
the conversion circuit comprises a first conversion circuit, a second conversion circuit, a third conversion circuit, a fourth conversion circuit and a fifth conversion circuit, and is used for converting the power supply into direct-current voltages of +1.8V, +1.5V, +3.3V, +1.325V and +1.1V respectively to supply power to the AM335x processor;
the input end of the power supply monitoring circuit is connected with the output end of the power supply, the output end of the power supply monitoring circuit is connected with the conversion circuit through a delay circuit, and the power supply monitoring circuit is used for driving the conversion circuit to sequentially output direct currents of +1.8V, +1.5V and +3.3V when the power supply is powered on, then driving the conversion circuit to simultaneously output direct voltages of +1.325V and +1.1V, powering on the AM335x processor, driving the +1.1V and +1.325V outputted by the conversion circuit to simultaneously power down when the power supply voltage is lower than a first preset threshold value, and then driving the +3.3V, +1.5V and +1.8V outputted by the conversion circuit to sequentially power down;
the reset voltage monitoring circuit, the input of reset voltage monitoring circuit with the output of power links to each other, the output of reset voltage monitoring circuit with the reset end of AM335x treater links to each other, is used for in the electricity-on process of AM335x treater, or when mains voltage is less than the second threshold value that predetermines, control the reset end of AM335x treater is in low level state all the time.
2. The AM335x discrete power supply power up-down timing control circuit of claim 1, wherein the power supply monitoring circuit comprises a voltage detection chip, a first delay circuit, a second delay circuit, and a third delay circuit;
the input end of the voltage detection chip is connected to the output end of the power supply, and the output end of the voltage detection chip is connected to the first delay circuit, the second delay circuit and the third delay circuit;
the enable terminal of the first converting circuit is also connected to the output terminal of the power supply, the output terminal of the first converting circuit is connected to the enable terminal of the second converting circuit through the first delay circuit, the output terminal of the second converting circuit is connected to the enable terminal of the third converting circuit through the second delay circuit, and the output terminal of the third converting circuit is connected to the enable terminals of the fourth converting circuit and the fifth converting circuit through the third delay circuit.
3. The AM335x discrete power supply power up-down timing control circuit of claim 2, wherein the first delay circuit comprises a first resistor and a first capacitor, the second delay circuit comprises a second resistor and a second capacitor, and the third delay circuit comprises a third resistor and a third capacitor; the power supply monitoring circuit further comprises a first diode, a fourth resistor, a second diode, a fifth resistor, a third diode and a sixth resistor;
the output end of the first conversion circuit is grounded through a first resistor and a first capacitor, the cathode of the first diode is connected to the output end of the voltage detection chip, the anode of the first diode is connected between the first resistor and the first capacitor through a fourth resistor, and the enable end of the second conversion circuit is connected between the first resistor and the first capacitor;
the output end of the second conversion circuit is grounded through a second resistor and a second capacitor, the cathode of the second diode is connected to the output end of the voltage detection chip, the anode of the second diode is connected between the second resistor and the second capacitor through a fifth resistor, and the enable end of the third conversion circuit is connected between the second resistor and the second capacitor;
the output end of the third conversion circuit is grounded through a third resistor and a third capacitor, the cathode of the third diode is connected to the output end of the voltage detection chip, the anode of the third diode is connected between the third resistor and the third capacitor through a sixth resistor, and the enabling ends of the fourth conversion circuit and the fifth conversion circuit are both connected between the third resistor and the third capacitor.
4. The AM335x discrete power supply power-on and power-off timing control circuit of claim 2, wherein the first conversion circuit, the second conversion circuit, the third conversion circuit, the fourth conversion circuit, and the fifth conversion circuit each comprise a transformation chip, an inductor, a fourth capacitor, and a voltage division circuit; the input end of the transformation chip is connected to the output end of the power supply, the output end of the transformation chip forms the output end of the corresponding transformation circuit after passing through the inductor, one end of the fourth capacitor and one end of the voltage division circuit are connected to the output end of the corresponding transformation circuit, and one end of the fourth capacitor and one end of the voltage division circuit are connected to the feedback end of the transformation chip; the enabling ends of the transformation chips corresponding to the first transformation circuit are connected to the output end of the power supply, the enabling ends of the transformation chips corresponding to the second transformation circuit and the third transformation circuit are connected to the output ends of the first transformation circuit and the second transformation circuit through a first delay circuit and a second delay circuit respectively, and the enabling ends of the transformation chips corresponding to the fourth transformation circuit and the fifth transformation circuit are connected to the output end of the third transformation circuit through a third delay circuit.
5. The AM335x discrete power supply power-on and power-off timing control circuit of claim 4, wherein the first, second, third, fourth, and fifth transformation circuits each comprise a first filter circuit and a second filter circuit, wherein the first filter circuit is connected between the transformer chip and the power supply, and the second filter circuit is connected between the transformer chip and an output terminal of the corresponding transformation circuit.
6. The AM335x discrete power supply power-on and power-off timing control circuit according to claim 4, wherein the voltage dividing circuit comprises a first voltage dividing resistor and a second voltage dividing resistor, one end of the first voltage dividing resistor is connected between the inductor and the output terminal of the corresponding conversion circuit, the other end of the first voltage dividing resistor is grounded through the second voltage dividing resistor, and the feedback terminal of the transformer chip is connected between the first voltage dividing resistor and the second voltage dividing resistor.
7. The AM335x discrete power supply power-on and power-off timing control circuit according to any of claims 1 to 6, wherein the reset voltage monitoring circuit comprises a reset monitoring chip with a delay, a seventh resistor, an eighth resistor and a fifth capacitor, a power supply end of the reset monitoring chip is connected to an output end of the power supply, an output end of the reset monitoring chip is connected to a reset end of the AM335x processor, one end of each of the seventh resistor and the eighth resistor is connected to the output end of the reset monitoring chip, one end of each of the seventh resistor and the eighth resistor is connected to the output ends of the third converting circuit and the first converting circuit, one end of the fifth capacitor is connected to the output end of the reset monitoring chip, and the other end of the fifth capacitor is grounded.
8. A method for implementing AM335x power-on timing control using the AM335x discrete power supply power-on and power-off timing control circuit of any of claims 1-7, comprising the steps of:
the power supply monitoring circuit detects the change of power supply voltage in real time, when the power supply is powered on, the power supply monitoring circuit drives the conversion circuit to sequentially output direct currents of +1.8V, +1.5V and +3.3V, then drives the conversion circuit to simultaneously output direct currents of +1.325V and +1.1V, and powers on the AM335x processor; when the power supply voltage is lower than a first preset threshold value, driving +1.1V and +1.325V output by the conversion circuit to be powered down simultaneously, and then driving +3.3V, +1.5V and +1.8V output by the conversion circuit to be powered down sequentially;
the reset voltage monitoring circuit detects the change of the power supply voltage in real time, and controls the reset end of the AM335x processor to be always in a low level state in the power-on process of the AM335x processor or when the power supply voltage is lower than a second preset threshold value.
9. The method according to claim 8, wherein the reset voltage monitoring circuit has a delay function, and in the process of powering on the AM335x processor, the reset voltage monitoring circuit outputs a high level to the reset terminal of the AM335x processor after delaying a first preset time, and the first preset time is greater than or equal to the time for the conversion circuit to power on the AM335x processor; and when the power supply voltage is lower than a second preset threshold value, the reset voltage monitoring circuit directly outputs a low level.
10. The method of claim 8, wherein when the power supply is powered on, the power supply monitoring circuit drives the conversion circuit to sequentially output +1.8V, +1.5V, +3.3V dc, and then drives the conversion circuit to simultaneously output +1.325V and +1.1V dc to power on the AM335x processor, comprising:
when the power supply is powered on, the power supply drives a first conversion circuit to directly power on +1.8V for the AM335x processor;
the first conversion circuit enables a second conversion circuit to realize the power-on of +1.5V for the AM335x processor after delaying for a second preset time through a first delay circuit;
the second conversion circuit enables a third conversion circuit to realize the power-on of +3.3V for the AM335x processor after delaying for a third preset time through a second delay circuit;
and the third conversion circuit enables the fourth conversion circuit and the fifth conversion circuit to realize the power-on of +1.325V and +1.1V for the AM335x processor after delaying for a fourth preset time through the third delay circuit.
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Address after: Room 901, 902, 903, 904, 905, and 906, Building 4, No. 18 Shenzhou Road, Huangpu District, Guangzhou City, Guangdong Province, 510000 (self numbered D) Patentee after: GUANGZHOU TRONLONG ELECTRONIC TECHNOLOGY Co.,Ltd. Address before: Room 220, Building 201, Building 4, No. 33, Science Avenue, Science City, High-tech Industrial Development Zone, Guangzhou City, Guangdong Province, 510000 Patentee before: GUANGZHOU TRONLONG ELECTRONIC TECHNOLOGY Co.,Ltd. |