CN112187047A - BOOST power supply, power supply circuit and electronic product - Google Patents
BOOST power supply, power supply circuit and electronic product Download PDFInfo
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- CN112187047A CN112187047A CN202010916011.XA CN202010916011A CN112187047A CN 112187047 A CN112187047 A CN 112187047A CN 202010916011 A CN202010916011 A CN 202010916011A CN 112187047 A CN112187047 A CN 112187047A
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
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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
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0032—Control circuits allowing low power mode operation, e.g. in standby mode
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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
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a BOOST power supply, a power supply circuit and an electronic product. The invention has the conception that the generation of leakage current can be effectively blocked by arranging the path switch which is associated with the closed state of the BOOST module between the two voltage feedback resistors, so that the consumption of the leakage current on a power supply and the influence on the whole machine can be greatly reduced. The invention can simplify the on-off control logic and effectively reduce the model selection difficulty and the device cost based on the design of the setting position of the access switch. Furthermore, the invention can also fully utilize the existing whole machine resources, and can realize the control of the access switch without additionally arranging high-cost devices.
Description
Technical Field
The invention relates to the field of power supply circuits, in particular to a BOOST power supply, a power supply circuit and an electronic product.
Background
A BOOST power supply (or referred to as a BOOST circuit, a BOOST power supply, a BOOST circuit, etc.) is a switching dc BOOST circuit, which generally includes a BOOST module and its peripheral topology, such as inductors, output upper tubes, voltage feedback resistors, capacitors, etc., and functions to make the voltage output to a load higher than the input voltage, which is a common circuit design method in electronic circuits. Most BOOST modules and other components in the BOOST circuit currently used are Integrated in a Power Management chip (referred to as a BOOST chip) and used as an independent Power IC (referred to as a BOOST chip) to cooperate with an external device.
For the BOOST power supply, because the BOOST inductor L and the output upper tube (rectifier diode or MOSFET) are connected in series in the input and output loops, even if the BOOST circuit is completely turned off, the output terminal will have a voltage that is lower than the input voltage by an inductor dc drop plus a diode forward conduction drop (a forward body diode exists between the source and drain of the MOSFET), that is, the BOOST circuit cannot be completely turned off. This results in that when the BOOST power supply is attached to the power supply circuit of the whole system, since the BOOST power supply cannot be completely turned off, a voltage exists at the output terminal thereof, and the voltage can be conducted to the ground through the feedback resistor of the BOOST power supply. After the BOOST module is turned off, the input voltage is led to the ground through the inductor, the diode and the voltage feedback resistor to form a current path, and the current path causes current consumption of the whole power supply (for convenience of explanation, the current consumption is called leakage current in the invention), which leads to the reduction of the total power supply efficiency.
Disclosure of Invention
In view of the above, the present invention is directed to a BOOST power supply, a power supply circuit and an electronic product, so as to solve the problem of leakage current generated by the BOOST circuit.
The technical scheme adopted by the invention is as follows:
in a first aspect, the present invention provides a BOOST power supply, including a BOOST module, a first feedback resistor and a second feedback resistor, wherein: and a path switch is arranged between the first feedback resistor and the second feedback resistor, is associated with the state of the BOOST module through a preset mechanism, and is used for disconnecting the first feedback resistor and the second feedback resistor when the BOOST module is closed.
In at least one possible implementation manner, the preset mechanism includes: and the enabling level for triggering and maintaining the state of the BOOST module and the level for triggering the action of the access switch adopt a unified signal source, and when the signal source is powered off, the enabling level and the level are simultaneously pulled down.
In at least one possible implementation manner, the pass switch is a voltage feedback switch MOS transistor, a source of the voltage feedback switch MOS transistor is connected to the second feedback resistor, a drain of the voltage feedback switch MOS transistor is connected to the first feedback resistor, and a gate of the voltage feedback switch MOS transistor is connected to the controllable level terminal;
and the controllable level end and the enabling level of the BOOST module are connected to a shared signal source together.
In at least one possible implementation, the common connection to a shared signal source includes:
the controllable level end and the enabling level are respectively connected with the shared signal source through the corresponding intermediate devices;
the shared signal source is a main power supply which supplies power to the power module and the micro-control unit.
In at least one possible implementation, the common connection to a shared signal source includes:
the controllable level end is connected to the shared signal source through an intermediate device, and the enabling level is directly connected to the shared signal source;
the shared signal source is a micro-control unit, and the intermediate device is a power module controlled by the micro-control unit.
In at least one possible implementation, the common connection to a shared signal source includes:
the controllable level end and the enabling level are respectively and directly connected to the shared signal source, wherein the shared signal source is a micro-control unit.
In at least one possible implementation manner, the device further comprises a pull-down resistor;
and two ends of the pull-down resistor are respectively connected with the grid electrode of the voltage feedback switch MOS tube and the ground.
In at least one possible implementation manner, the voltage feedback switch MOS transistor is a low-voltage NMOS transistor with a turn-on voltage of 1v to 3 v.
In a second aspect, the present invention provides a power supply circuit applied to an electronic product, where the power supply circuit includes a plurality of power modules, and at least one of the power modules is the BOOST power supply.
In a third aspect, the present invention provides an electronic product, which includes a plurality of functional modules, wherein the power supply circuit is used to provide electric energy for the functional modules.
The invention has the conception that the generation of leakage current can be effectively blocked by arranging the path switch which is associated with the closed state of the BOOST module between the two voltage feedback resistors, so that the consumption of the leakage current on a power supply and the influence on the whole machine can be greatly reduced. The invention can simplify the on-off control logic and effectively reduce the model selection difficulty and the device cost based on the design of the setting position of the access switch.
Furthermore, the invention can also fully utilize the existing whole machine resources, and can realize the control of the access switch without additionally arranging high-cost devices.
Drawings
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be further described with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of an embodiment of a BOOST BOOST power supply provided by the present invention;
FIG. 2 is a flow chart of a preferred embodiment of the BOOST BOOST power supply provided by the present invention;
fig. 3 is a block diagram of an embodiment of a power supply circuit provided by the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which 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 illustrative only and should not be construed as limiting the invention.
Before describing the proposed solution in detail, the inventive concepts and the derivation of the invention are described below.
In addition to the above background, for example, in some electronic products with a BOOST power supply and powered by a battery, if the leakage current generated by the BOOST power supply is too large, the power consumption of the battery will increase and the standby time will become short. Based on the scene of automobile electronic products, when the automobile is not used for a long time, the consumption of the electric quantity of the battery can be accelerated by overlarge leakage current, so that level feed is caused, and the situation that ignition cannot be performed can occur when the automobile is restarted. Particularly, when the input voltage of the BOOST power supply is high and the value of the voltage feedback resistor of the output end is relatively small, the leakage current generated by the incomplete turn-off of the BOOST power supply is considerable, so that the invention aims to effectively eliminate/reduce the leakage current phenomenon caused by the turn-off of the BOOST power supply in the whole machine.
Based on this initial object, the inventors considered the following approaches to reduce leakage current caused by BOOST power supply:
(1) and increasing the value of the voltage feedback resistor at the output end.
(2) And a MOS is added at the power input end of the BOOST to turn off the power supply.
(3) And adding MOS (metal oxide semiconductor) at the output end of the BOOST power supply to turn off.
For the method (1), a larger voltage feedback resistance value can be selected, so that the generated leakage current is relatively smaller, and the high efficiency of the power supply source is ensured to a certain extent, especially in a light load scene. However, the voltage feedback resistance cannot be increased blindly, and an excessively large voltage feedback resistance increases the noise sensitivity of the power supply and also affects the accuracy of the output voltage of the power supply.
The design ideas of the methods (2) and (3) are similar, because the input end voltage of the BOOST power supply is lower than the output end, and the input end current is higher than the output end, the method (2) can reduce the impact of high voltage on the MOS at the starting moment, and the method (3) can also reduce the power consumption of the MOS by adding the MOS into the output end. When the condition of generating leakage current exists, the added MOS is disconnected, so that a path from input to output of the BOOST power supply can be disconnected, no voltage exists on the output end and the voltage feedback resistor at the moment, a path cannot be formed, and the leakage current consumption of the BOOST power supply to the whole machine can be eliminated. However, the MOS is added at the input/output end of the BOOST power supply to turn off the leakage current path, on one hand, the MOS with large conduction current id (on) needs to be selected, and the cost is high; in addition, because the MOS is added at the input/output terminal of the BOOST power supply, which is equivalent to connecting the MOS in series into the power stage of the BOOST circuit, when the BOOST circuit is a high-voltage large-current MOS, the corresponding MOS must be selected as a high-voltage large-current MOS, which obviously increases the cost and difficulty of MOS type selection. On the other hand, the control is complex, especially for a scenario with a high input voltage, since the MOS source S voltage applied to the input/output terminal is equal to the input voltage, the gate G needs to be higher than the input voltage level to turn on the MOS, and therefore an additional boost circuit or an additional high voltage needs to be added to ensure that a higher voltage is provided to the G pole of the MOS.
In view of the above, the present invention finally abandons the design idea, and improves the design method by designing a set of switch circuit on the voltage feedback resistance path and switching on/off the switch circuit by the state of leakage current, so that when the BOOST module is turned off, the output of the BOOST power supply can be effectively switched off through the current path from the voltage feedback resistance to the ground, thereby greatly reducing the leakage current consumption of the whole machine.
In particular, the present invention provides at least one BOOST power supply embodiment, as shown in figure 1, in the topology structure of the BOOST power supply of the prior art (as shown in the figure, the topology structure may include a BOOST module B, a BOOST inductor L, a SW pin of a diode D, BOOST module B connected between L and D, a first feedback resistor R1, a second feedback resistor R2, and the like, where VIN represents an input voltage and VOUT represents an output voltage, which are input to the prior art and are not described in detail herein), a path switch S1 is disposed between the first feedback resistor R1 and the second feedback resistor R2, the function of the pass switch S1 is to disconnect the first feedback resistor R1 from the second feedback resistor R2 when the BOOST module B is turned off, therefore, the path of the input voltage VIN to the ground through the first feedback resistor R1 and the second feedback resistor R2 can be blocked, and the leakage current generated by the BOOST power supply is stopped.
In the concept of this embodiment, the state of the path switch S1 is associated with the change of the state of the BOOST module B (this association is schematically expressed by a dashed line in fig. 1, and specific implementation manner can be described later), especially, the BOOST module B changes from the start state to the off state, for example, after the complete machine PCB is powered on, the path switch S1 may be triggered to close, so as to form a normal voltage feedback path in the topology of the BOOST power supply, at this time, the BOOST module B may pull up the EN (enable) pin level of the BOOST module B through the I/O port of the MCU on the PCB, so as to change the BOOST power supply from the off state to the start state, at this time, the BOOST power supply starts to operate normally (preferably, the enable pin of the BOOST module B may be pulled up first and then the BOOST module S1 is closed, or both may be synchronized).
In the normal working stage of the BOOST power supply, the path switch S1 is always in the closed state, once the BOOST module B in the BOOST power supply does not work, the path switch S1 is turned into the open state, and in the actual operation, the state association between the path switch S1 and the BOOST module B can be realized by adopting various mechanisms, for example, a monitoring mechanism, that is, the state change of the BOOST module B is monitored by a monitoring device, and an action signal is sent to the path switch S1, and a mature relay with lower cost can be specifically adopted; for example, a signal sharing mechanism, for example, an EN level for triggering and maintaining the state of the BOOST module B and a level for triggering the action of the pass switch S1 adopt a unified signal source, and when the signal source is powered off, the EN level and the level for triggering the action of the pass switch S1 are simultaneously pulled down; alternatively, it is contemplated that a separate on/off control (such as, but not limited to, other power modules already on board the machine) may be provided for the pass switch S1, and the on/off control may be associated with the state of the BOOST module B or share the signal source with the EN level of the BOOST module, which is described only schematically and will be described in detail later.
For example, in at least one possible implementation manner of the present invention, the path switch S1 is a MOS transistor, and specifically, in combination with fig. 2, an NMOS transistor may be added between two voltage feedback resistors (i.e., the aforementioned R1 and R2) in the BOOST power supply structure to reduce the leakage current generated by the BOOST power supply on the whole machine. Of course, for the sake of distinction, this MOS transistor can be referred to as a voltage feedback switch MOS transistor. The specific connection mode is that the source S of the voltage feedback switch MOS tube is connected with the resistor R2, the drain D is connected with the resistor R1, the grid G is connected with a controllable level end, the controllable level end and the enable level EN of the BOOST module B can come from a shared signal source, therefore, when the shared signal source is powered off according to the existing operation logic of the whole machine, the enable level of the BOOST module B is pulled down, and the voltage feedback switch MOS tube is disconnected because the conducting voltage is at a low position (the controllable level is pulled down).
The controllable level terminal and the enable level of the BOOST module B can be derived from a common signal source, and in actual operation, the following forms can be used as reference:
(1) in an example, the shared signal source may be, but is not limited to, an existing Micro Control Unit (MCU) of the whole device in actual operation, and the controllable level end and the enable level of the BOOST module B may be directly associated with an I/O port of the MCU, and the specific connection means may be based on a conventional control scheme, which is not described herein.
(2) The controllable level end and the enable level are respectively connected to the shared signal source through an intermediate device, in one example, the intermediate device may be different for the two, for example, for the enable level, the intermediate device may adopt an MCU existing on the whole device; for the controllable level, the intermediate device can adopt an existing power module on the whole machine, and the shared signal source can be a total power supply for supplying power to the MCU and the power module; thus, when the mains power is down, both intermediate devices also cease to operate, so that the off state of the BOOST module B is cooperatively associated with the action of the pass switch S1.
(3) In one example, the intermediate device may be a power module on the whole machine, the shared signal source is an MCU on the whole machine, that is, the MCU is connected to an EN pin of the BOOST module B through an I/O port, and simultaneously controls a working state of the power module through the I/O port, so that when the MCU is powered off, the off state of the BOOST module B can be cooperatively associated with an action of the on-off switch S1.
In addition, based on the drawbacks of the first few attempts of the present invention mentioned above, the present invention also makes the following idea when designing the setting position of the on-off switch S1 (i.e. the voltage feedback switch MOS transistor in the above embodiment):
taking the voltage feedback switch MOS as an example, the reason why the voltage feedback switch MOS is disposed between the first feedback resistor R1 and the second feedback resistor R2, rather than disposed above the first feedback resistor R1 (i.e., between the output voltages VOUT and R1) is that, firstly, the source S voltage of the voltage feedback switch MOS is connected between R1 and R2, and therefore, the lower gate G voltage (i.e., the level of the trigger switch S1, i.e., the controllable level in the foregoing embodiment) can be used to control the turn-on of the voltage feedback switch MOS without adding an additional high voltage. Secondly, the voltage feedback switch MOS tube is connected on a path of an output voltage feedback resistor, and the current on the feedback path is very small due to the existence of the first feedback resistor R1 and the second feedback resistor R2, so that the conduction current IDS (on) of the voltage feedback switch MOS tube does not need to be very large. Further, the reason why it is provided between the first feedback resistor R1 and the second feedback resistor R2, rather than between the second feedback resistor R2 and the ground is: although it seems that the feedback path can be cut off similarly, it is found by analysis that this is not the case, if there is a case where the path switch S1 (voltage feedback switch MOS transistor) is placed between R2 and ground, that is, a path through R1, FB pin and ground inside the BOOST module B is formed, even though theoretically the current from FB pin to R2 is negligible, when S1 is turned off, only the path from R2 to ground is cut off, the path from R1 to FB pin to ground inside B cannot be cut off, and the leakage current cannot be practically eliminated.
Further, according to the structural characteristics of the design of the present invention mentioned in the above analysis, the voltage feedback switch MOS transistor can be implemented by selecting a low-cost MOS with a lower turn-on voltage and a smaller conduction current, and particularly when the BOOST power supply serves a high-voltage and large-current scenario, the present invention is more prominent in the advantage of the type selection of the pass switch, for example, the voltage feedback switch MOS transistor is selected as a low-voltage NMOS, where a non-limiting reference example, DMTH4004LPSQ, has a conduction voltage as low as 1v to 3 v. Therefore, the feedback path can be conducted under the condition that the grid-source voltage VGS is lower, and therefore, the grid G of the voltage feedback switch MOS tube can be directly controlled by an existing MCU I/O port on the whole machine PCB or other existing power supply devices in the actual operation.
In summary, the present invention can yield at least the following advantages:
1. the device is simple and convenient to set and low in cost, a special high-voltage large-current MOS switch is not required to be configured, and the model selection cost and difficulty can be remarkably reduced.
2. The on-off of the access switch is associated with the state of the BOOST module, and on the basis that low-voltage MOS can be realized, no additional switch control device is needed to be configured, and the effect of reducing and eliminating leakage current can be realized through the output of an MCU I/O port or a board such as a power module.
It should be added that when the BOOST power supply is normally started, the FB pin of the BOOST module B has a voltage value output (referred to as a bandgap reference voltage, which is generally low, such as 0.8v, 1.0v, and usually does not exceed 1.2 v). Namely, the source S voltage of the voltage feedback switch MOS transistor will rise to the bandgap reference voltage value at this time. Therefore, in order to ensure normal conduction of the MOS transistor, when a low-voltage MOS transistor is selected, it is necessary to consider that the gate-source voltage VGS should satisfy a level value range obtained by subtracting the bandgap reference voltage from the controllable level, that is, when the MOS transistor is specifically implemented, the existing signal source of the whole machine, the output voltage value of the power supply and the bandgap reference voltage are combined, so as to select a more matched low-voltage MOS transistor.
In conjunction with fig. 2, as mentioned above, the MCU may be used as a shared signal source of the pass switch S1 and the EN pin, that is, when the gate G of the voltage feedback switch MOS transistor is controlled by the I/O port of the MCU, in order to prevent the I/O port level from being unstable (e.g. interfered by other devices on the complete machine PCB) after the MCU is powered off, a pull-down resistor R3 may be connected between the gate G of the voltage feedback switch MOS transistor and ground, so that when the MCU is powered off, the gate G of the voltage feedback switch MOS transistor is effectively pulled down to ground, thereby ensuring that the voltage feedback switch MOS transistor is reliably turned off, and of course, as will be understood by those skilled in the art, the pull-down resistor R3 may be selectively added or deleted according to the difference of the control source of the gate G of the voltage feedback switch MOS transistor, for example, when the gate G of the voltage feedback switch MOS transistor is directly connected to the output of a power module (e.g. a secondary power, the pull-down resistor R3 may be selectively disconnected.
The following summarizes the working principle of the improved BOOST power supply of BOOST on board according to the present invention to effectively reduce the influence of leakage current on the whole power supply, with reference to the preferred embodiment as shown in fig. 2:
(1) the whole machine product is normally powered on, and the source S of the voltage feedback switch MOS tube is equivalent to the grounding through the second feedback resistor R2 at the beginning.
(2) At the moment, each device is electrified to work, the MCU triggers the BOOST module B to start normally, and when the MCU directly or indirectly outputs high level to the grid G of the voltage feedback switch MOS tube through other power supply modules, the voltage feedback switch MOS tube is conducted.
(3) Meanwhile, the source-level S voltage of the voltage feedback switch MOS tube becomes the band-gap reference voltage in the BOOST module B, as mentioned above, the invention is characterized in that the voltage feedback switch MOS tube can select low-voltage MOS, namely, the voltage feedback switch MOS tube can be conducted under the condition that the grid/source voltage VGS is lower, the output level of the MCU I/O port or the level range of the output voltage flat value of the power module minus the band-gap reference voltage is enough to ensure the lower grid/source voltage VGS, therefore, the voltage feedback switch MOS tube is still conducted normally.
(4) When the MCU is triggered to be powered off by the outside, the BOOST module B is closed, the controllable level of the output of the I/O port of the MCU or other power supply modules is changed into low level, the grid/source voltage VGS of the voltage feedback switch MOS tube is low at the moment, the voltage feedback switch MOS tube is cut off (namely the pass switch S1 is cut off), so that the current path from the output of the BOOST boosting power supply to the ground through the first feedback resistor R1 and the second feedback resistor R2 is cut off, the generation of leakage current is effectively blocked, and the consumption of the leakage current to the power supply and the influence on the whole machine can be greatly reduced.
In summary, the idea of the present invention is that a path switch associated with the off state of the BOOST module is disposed between the two voltage feedback resistors, so as to effectively block the generation of the leakage current, thereby greatly reducing the consumption of the leakage current on the power supply and even the influence on the whole device. The invention can simplify the on-off control logic and effectively reduce the model selection difficulty and the device cost based on the design of the setting position of the access switch.
Furthermore, the invention can also fully utilize the existing whole machine resources, and can realize the control of the access switch without additionally arranging high-cost devices.
Based on the embodiments and the working principle of the BOOST power supply, the invention also provides a power supply circuit applied to electronic products.
For the sake of understanding, a specific implementation scenario is listed below with an in-vehicle application scenario:
in a vehicle scenario, a power supply circuit of some electronic products may be associated with an ACC line, that is, when an ACC signal is not connected to a battery (in this example, the battery and the ACC line may constitute the aforementioned "total power source"), the power supply circuit of the product may not be started, that is, in the scenario, the ACC line may be used as a leakage current generation signal, that is, after the ACC is turned off, each power module (including a BOOST power source and a secondary power module) in the whole product does not work any more.
Referring to fig. 3, in this embodiment, the BOOST power supply is used as the power module 1, and is connected to the battery BATT together with the parallel power module 2, the power module n is a secondary power supply of the power module 2, and in this example, the output voltage of the power module n is used as the control source of the pass switch S1 (i.e. the voltage feedback switch MOS transistor), the enable pin of the BOOST module B is connected to the I/O port of the MCU external to the power supply circuit, and the MCU can be powered by the power module 2. After the ACC stage is turned on (the ACC stage belongs to general knowledge of vehicle control power-on, and is not described herein), each power module in the power supply circuit is normally powered on, the gate G voltage of the voltage feedback switch MOS transistor is the output voltage of the power module n, at this time, the voltage feedback switch MOS transistor is turned on (i.e., the pass switch S1), and the pass through which the BOOST power supply outputs to the first and second feedback resistors R1 and R2 is normal, so that the BOOST power supply can output a preset voltage to a subsequent functional module (the functional module is not a device of the power supply circuit, and this reference is only for convenience of description). Afterwards, when the ACC gear is disconnected, the power module 2 and the power module n do not work any more, and correspondingly the power module 1 does not work any more, at this time, since the power module n outputs a low level, the voltage feedback switch MOS transistor is turned off, and the path from the BOOST power supply output to the first and second feedback resistors R1 and R2 is disconnected, a current path cannot be formed, and the influence of leakage current in the power supply circuit on the whole machine product and the consumption of the battery BATT are greatly reduced. It should be noted that the number of power modules is not limited in the present invention, and as can be seen from fig. 3, the power module n may not be a power supply source dedicated to the path switch S1 (in this scenario, the power module n may be a power supply source for other functional modules of the electronic product), so in actual operation, a power transmission line may be additionally led out via the power module n to provide a turn-on voltage for the gate G (connectable to the controllable level end) of the voltage feedback switch MOS transistor.
Based on the introduction of the BOOST power supply and the embodiments of the power supply circuit, the invention further provides an electronic product, which is characterized by comprising a plurality of functional modules powered by the power supply circuit. Of course, based on the foregoing description, those skilled in the art can understand the advantages of the electronic product, i.e. the electronic product is not affected by the leakage current of the BOOST power supply, and in practical operation, specifically, what kind of electronic product may be selected, such as but not limited to vehicle-mounted electronic product, power amplifier device, and so on.
In the embodiments of the present invention, "at least one" means one or more, "a plurality" means two or more. "and/or" describes the association relationship of the associated objects, and means that there may be three relationships, for example, a and/or B, and may mean that a exists alone, a and B exist simultaneously, and B exists alone. Wherein A and B can be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" and similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, at least one of a, b, and c may represent: a, b, c, a and b, a and c, b and c or a and b and c, wherein a, b and c can be single or multiple.
The structure, features and effects of the present invention have been described in detail with reference to the embodiments shown in the drawings, but the above embodiments are merely preferred embodiments of the present invention, and it should be understood that technical features related to the above embodiments and preferred modes thereof can be reasonably combined and configured into various equivalent schemes by those skilled in the art without departing from and changing the design idea and technical effects of the present invention; therefore, the invention is not limited to the embodiments shown in the drawings, and all the modifications and equivalent embodiments that can be made according to the idea of the invention are within the scope of the invention as long as they are not beyond the spirit of the description and the drawings.
Claims (10)
1. The utility model provides a BOOST power that steps up, includes BOOST module, first feedback resistance and second feedback resistance, its characterized in that: and a path switch is arranged between the first feedback resistor and the second feedback resistor, is associated with the state of the BOOST module through a preset mechanism, and is used for disconnecting the first feedback resistor and the second feedback resistor when the BOOST module is closed.
2. The BOOST power supply according to claim 1, wherein the predetermined mechanism comprises: and the enabling level for triggering and maintaining the state of the BOOST module and the level for triggering the action of the access switch adopt a unified signal source, and when the signal source is powered off, the enabling level and the level are simultaneously pulled down.
3. The BOOST power supply according to claim 2, wherein the pass switch is a voltage feedback switch MOS transistor, a source of the voltage feedback switch MOS transistor is connected to the second feedback resistor, a drain of the voltage feedback switch MOS transistor is connected to the first feedback resistor, and a gate of the voltage feedback switch MOS transistor is connected to the controllable level terminal;
and the controllable level end and the enabling level of the BOOST module are connected to a shared signal source together.
4. The BOOST power supply according to claim 3, wherein said common connection to a shared signal source comprises:
the controllable level end and the enabling level are respectively connected with the shared signal source through the corresponding intermediate devices;
the shared signal source is a main power supply which supplies power to the power module and the micro-control unit.
5. The BOOST power supply according to claim 3, wherein said common connection to a shared signal source comprises:
the controllable level end is connected to the shared signal source through an intermediate device, and the enabling level is directly connected to the shared signal source;
the shared signal source is a micro-control unit, and the intermediate device is a power module controlled by the micro-control unit.
6. The BOOST power supply according to claim 3, wherein said common connection to a shared signal source comprises:
the controllable level end and the enabling level are respectively and directly connected to the shared signal source, wherein the shared signal source is a micro-control unit.
7. The BOOST power supply according to claim 6, further comprising a pull-down resistor;
and two ends of the pull-down resistor are respectively connected with the grid electrode of the voltage feedback switch MOS tube and the ground.
8. The BOOST power supply according to any one of claims 3 to 7, wherein the voltage feedback switch MOS transistor is a low voltage NMOS transistor with a turn-on voltage of 1v to 3 v.
9. A power supply circuit applied to an electronic product, the power supply circuit comprising a plurality of power modules, wherein at least one of the power modules is the BOOST power supply of any one of claims 1 to 8.
10. An electronic product comprising a plurality of functional modules, wherein the power supply circuit of claim 9 is used to supply power to the functional modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010916011.XA CN112187047A (en) | 2020-09-03 | 2020-09-03 | BOOST power supply, power supply circuit and electronic product |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010916011.XA CN112187047A (en) | 2020-09-03 | 2020-09-03 | BOOST power supply, power supply circuit and electronic product |
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| CN112187047A true CN112187047A (en) | 2021-01-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010916011.XA Pending CN112187047A (en) | 2020-09-03 | 2020-09-03 | BOOST power supply, power supply circuit and electronic product |
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