CN220732416U - Power supply circuit capable of reducing power supply loss of battery and USB - Google Patents
Power supply circuit capable of reducing power supply loss of battery and USB Download PDFInfo
- Publication number
- CN220732416U CN220732416U CN202322173718.8U CN202322173718U CN220732416U CN 220732416 U CN220732416 U CN 220732416U CN 202322173718 U CN202322173718 U CN 202322173718U CN 220732416 U CN220732416 U CN 220732416U
- Authority
- CN
- China
- Prior art keywords
- power supply
- diode
- mos transistor
- conversion module
- supply circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000006243 chemical reaction Methods 0.000 claims abstract description 83
- 239000003990 capacitor Substances 0.000 claims description 38
- 230000009977 dual effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003985 ceramic capacitor Substances 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Landscapes
- Direct Current Feeding And Distribution (AREA)
Abstract
The utility model discloses a power supply circuit for reducing power supply loss of a battery and a USB, which comprises: the device comprises a high-voltage battery, a USB power supply, a first diode, a second diode, a MOS transistor and a direct current conversion module; the high-voltage battery is connected with the first diode, the high-voltage battery is connected with the drain electrode of the MOS transistor, the first diode is connected with the MOS transistor in parallel, the sources of the first diode and the MOS transistor are connected with the input end of the direct current conversion module, and the grid electrode of the MOS transistor is grounded; the USB power supply is connected with the second diode, the second diode is connected with the input end of the direct current conversion module, and the output end of the direct current conversion module is connected with an external load.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a power supply circuit capable of reducing power supply loss of a battery and a USB.
Background
In the new intelligent POS design, in order to obviously improve the printing speed of the thermal printer, a high-voltage battery (output is 7.4V) is generally adopted for supplying power, and the power supply of the wireless AP end is provided by the high-voltage battery through a direct-current converter (output is 3.8V). Meanwhile, in order to ensure that the equipment is started up by inserting external electric energy when the battery is over-discharged, the direct current converter can also take USB power supply (output is 5V) as an input end, and in order to prevent backflow between two paths of power supplies, the two paths of input are isolated through a diode.
When the equipment is started up and runs, the power supply of the AP end always works after the equipment is started up, however, under the standby condition, the loss on the diode is relatively large, and under the condition of relatively large load current, the heating value of the diode is also greatly increased, so that the temperature rise of the whole equipment is adversely affected.
Disclosure of Invention
The utility model provides a power supply circuit for reducing power supply loss of a battery and a USB, which is used for reducing the loss on a power supply circuit device under the functional condition of meeting dual power supply input.
The application provides a reduce power supply circuit of battery and USB power supply loss, a serial communication port, power supply circuit includes:
the device comprises a high-voltage battery, a USB power supply, a first diode, a second diode, a MOS transistor and a direct current conversion module;
the high-voltage battery is connected with the first diode, the high-voltage battery is connected with the drain electrode of the MOS transistor, the first diode is connected with the MOS transistor in parallel, the sources of the first diode and the MOS transistor are connected with the input end of the direct current conversion module, and the grid electrode of the MOS transistor is grounded; the USB power supply is connected with the second diode, the second diode is connected with the input end of the direct current conversion module, and the output end of the direct current conversion module is connected with an external load.
Optionally, the dc conversion module includes a dc conversion chip and a first capacitor group, where the first diode, the MOS transistor, and the second diode are connected in series with the first capacitor group, and the first capacitor group is connected with the VIN pin of the dc conversion chip.
Optionally, the direct current conversion module further comprises an enabling circuit, and the enabling circuit is connected with an EN pin of the direct current conversion chip.
Optionally, a bootstrap capacitor is connected between the LX pin and the BS pin of the dc conversion chip.
Optionally, the dc conversion module further includes a feedback circuit, where the feedback circuit is connected to the FB pin of the dc conversion chip.
Optionally, the dc conversion module further includes a second capacitor set, and the feedback circuit is connected to the second capacitor set, and the second capacitor set is connected to the external load.
Optionally, an inductance is connected between the LX pin of the dc conversion chip and the feedback circuit.
Optionally, the output voltage of the direct current conversion module is 3.8V.
Optionally, the working voltage of the high-voltage battery is 7-8.4V.
Optionally, the MOS transistor is a P-channel MOS transistor.
From the above technical scheme, the utility model has the following advantages:
by constructing the first diode and the connecting circuit between the MOS transistor and the direct current conversion module, when the direct current conversion module works, current can flow through one path of the MOS transistor, and the internal resistance of the MOS transistor can be ignored, so that the loss caused by the diode on the old power supply scheme is solved, the loss of the whole power supply circuit is reduced under the condition of meeting various working scenes of dual power supplies, the influence of the power supply circuit on equipment temperature rise is reduced, and the standby and working time of the equipment are obviously improved.
Drawings
FIG. 1 is a schematic diagram of a power supply circuit for reducing power consumption of a battery and a USB according to the present utility model;
FIG. 2 is a schematic diagram of current flows in operational scenario 1 and 2 of a power supply circuit for reducing power consumption of a battery and USB according to the present utility model;
fig. 3 is a schematic diagram of a current flow in a working scenario 3 of a power supply circuit for reducing power consumption of a battery and a USB according to the present utility model.
Detailed Description
In the present application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are merely used to illustrate the relative positional relationships between the components or portions, and do not particularly limit the specific mounting orientations of the components or portions.
Also, some of the terms described above may be used to indicate other meanings in addition to orientation or positional relationships, for example, the term "upper" may also be used to indicate some sort of attachment or connection in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "mounted," "configured," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; may be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements, or components. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
Furthermore, the structures, proportions, sizes, etc. shown in the drawings herein are shown and described in detail for purposes of illustration only, and are not intended to limit the scope of the utility model, which is defined in the claims, unless otherwise indicated, and which are otherwise used by those skilled in the art to which the utility model pertains.
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
The utility model discloses a power supply circuit for reducing power supply loss of a battery and USB (universal serial bus), which is used for reducing the loss on a power supply circuit device under the functional condition of meeting dual power input, and is described in detail below with reference to the accompanying drawings.
Referring to fig. 1 to 3, an embodiment of a power supply circuit for reducing power consumption of a dual-string battery and a USB provided in the present application includes:
the high-voltage battery VBAT7V4, the USB power supply VBUS, the first diode D5, the second diode D7, the MOS transistor Q1 and the direct-current conversion module;
the high-voltage battery VBAT7V4 (for example, a dual-string battery, i.e., two batteries are connected in series) is connected with the first diode D5, the high-voltage battery VBAT7V4 is connected with the drain electrode of the MOS transistor Q1, the first diode D5 is connected in parallel with the MOS transistor Q1, the first diode D5 and the source electrode of the MOS transistor Q1 are connected with the input end of the dc conversion module, and the gate electrode of the MOS transistor Q1 is grounded; the USB power supply VBUS is connected with the second diode D7, the second diode D7 is connected with the input end of the direct current conversion module, and the output end of the direct current conversion module is connected with an external load.
In this embodiment, the high-voltage battery VBAT7V4 and the USB power supply VBUS can both supply power to the device, the voltages output by the high-voltage battery VBAT7V4 and the USB power supply VBUS need to be reduced by the dc conversion module, and the dc conversion module outputs vcc_core (3.8V) to an external load. In order to prevent backflow between the two power supplies, the high-voltage battery VBAT7V4 and the USB power supply VBUS are isolated by a first diode D5 and a second diode D7.
Under the old power supply scheme, when the equipment is in standby, the input average current of the direct current conversion module is 150mA, at the moment, the voltage drop of a diode connected with the high-voltage battery VBAT7V4 is 0.3V, and the power lost on the diode is 0.045W; in the case of a relatively large number of peripheral devices, the average input current of the dc conversion module may reach 1A, where the voltage drop of the diode is 0.35V, and the power lost across the diode is 0.35W, which is relatively large for the high voltage battery VBAT7V4 of 7.4V/2600mAh/19.24 Wh. Based on this, in this embodiment, by adding a MOS transistor Q1 in parallel to the diode (i.e., the first diode D5 in this embodiment), the drain of the MOS transistor Q1 is connected to the high-voltage battery VBAT7V4, the source of the MOS transistor Q1 is connected to the input end of the dc conversion module, and the gate of the MOS transistor Q1 is grounded, so that when the dc conversion module works, current flows through the MOS transistor Q1, and the internal resistance of the MOS transistor Q1 is negligible, thereby solving the loss caused by the diode in the old power scheme and meeting the normal work of various scenes of dual power supply.
Specifically, in practical application, the dual power supply corresponds to three different working scenarios, and the following description is given respectively:
working scene one: when the external power is not connected, the battery voltage of the high-voltage battery VBAT7V4 is above 7V, since the USB power supply VBUS has no voltage, the gate voltage of the MOS transistor Q1 is 0V, and the MOS transistor Q1 is turned on, the process of outputting the high-voltage battery VBAT7V4 to the dc conversion module is basically free from loss, and the specific current flows to refer to fig. 2.
Working scenario 2: when the external power is plugged in, the voltage of the battery VBAT7V4 is above 7V, the voltage of the gate and the source of the MOS transistor Q1 is above 2V, and the MOS transistor Q1 is turned on, so that the process of outputting the high voltage battery VBAT7V4 to the dc conversion module is basically lossless, and the specific current flows to fig. 2.
Working scenario 3: when the battery VBAT7V4 is overdischarged after being plugged into the external power supply, the battery voltage is 0V, the gate voltage and the source voltage of the MOS transistor Q1 are substantially equal, the MOS transistor Q1 is turned off, the USB power supply VBUS cannot be directly plugged into the battery through the first diode D5 and the MOS transistor Q1, and a large current input is not formed to the high voltage battery VBAT7V4, so that damage to the battery is avoided, and a specific current flows to please refer to fig. 3.
It can be seen that the power supply circuit provided in this embodiment can achieve the expected result that the circuit can work normally in various scenarios, and the problem of power loss caused by the series diode is solved by the MOS transistor Q1 peripheral circuit.
In this embodiment, by setting up the connection circuit between the first diode D5 and the MOS transistor Q1 and the dc conversion module, when the dc conversion module works, current can flow through the MOS transistor Q1, and the internal resistance of the MOS transistor Q1 is negligible, so that the loss caused by the diode in the old power supply scheme is solved, and thus, the loss of the whole power supply circuit is reduced under the condition of meeting various working scenarios of the dual power supply, the influence of the power supply circuit on the temperature rise of the equipment is reduced, and the standby time and the working time of the equipment are obviously improved.
Optionally, the dc conversion module includes a dc conversion chip U2 and a first capacitor group, where the first diode D5, the MOS transistor Q1, and the second diode D7 are connected in series with the first capacitor group, and the first capacitor group is connected to the VIN pin of the dc conversion chip U2.
In this embodiment, the dc conversion module includes a dc conversion chip U2 and a first capacitor set, the VIN pin of the dc conversion chip U2 is a pin for inputting a dc power supply, the pin receives an input voltage of the high-voltage battery VBAT7V4/USB power supply VBUS, and the dc conversion chip U2 can perform a conversion or conversion operation by using the input voltage by connecting the dc power supply to the VIN pin, so as to generate a required output voltage or current. The first capacitor bank is further connected in series between the high-voltage battery VBAT7V4/USB power supply VBUS and the VIN pin of the dc conversion chip U2, and in some cases, the operation of the dc conversion chip U2 may cause power feedback, i.e. the output signal returns to the input power line.
In some specific embodiments, the dc conversion chip U2 is of the STI3471 type, and the first capacitor set is specifically composed of three capacitors of 10 μf connected in parallel.
Optionally, the dc conversion module further includes an enabling circuit, and the enabling circuit is connected to an EN pin of the dc conversion chip U2.
In this embodiment, the EN pin of the dc conversion chip U2 is a pin for controlling the enable or disable state of the chip, and the function of the dc conversion chip U2 can be enabled or disabled by controlling the level of the EN pin. When the EN pin is in an enabled state (typically high level or logic 1), the chip starts to work normally, performs a step-down function, and when the EN pin is in a disabled state (typically low level or logic 0), the chip stops working or enters a low power consumption mode to save energy or control output. The EN pin of the dc conversion chip U2 is connected to an enable circuit, so that the enable circuit can enable or disable the dc conversion chip U2.
In some specific embodiments, referring to fig. 1, the enabling circuit is composed of resistors R5 and R10, a capacitor C10, and two diodes D8 and D6, wherein the diode D8 is connected to VCC4v_en, and the diode D6 is connected to the USB power supply VBUS.
Optionally, a bootstrap capacitor is connected between the LX pin and the BS pin of the dc conversion chip U2.
The LX pin of the direct current conversion chip U2 is an output pin for controlling the on and off of the high-side switch, and the BS pin is used for providing a control signal to the LX pin. In this embodiment, a bootstrap capacitor is connected between the LX pin and the BS pin of the dc conversion chip U2, and the bootstrap capacitor is used to provide enough charges to drive the control signal of the high side switch, and the bootstrap capacitor can be charged and discharged by using periodic switching in the switching period, when the control signal turns on the high side switch through the BS pin, the bootstrap capacitor is charged to provide the required voltage, and when the control signal turns off the high side switch, the bootstrap capacitor is discharged through the LX pin.
In some embodiments, the bootstrap capacitor has a capacitance of 100nF.
Optionally, the dc conversion module further includes a feedback circuit, and the feedback circuit is connected to the FB pin of the dc conversion chip U2.
In this embodiment, the FB pin of the dc conversion chip U2 is a feedback pin, and by connecting the feedback circuit with the FB pin, feedback control on the output voltage or current can be achieved. The feedback circuit is used for monitoring the output signal and returning the feedback signal to the direct current conversion chip U2 so as to realize stable control of output. The feedback circuit includes a comparator or amplifier for comparing the output signal with a reference signal and generating a corresponding feedback signal. After a certain processing, the feedback signal is input to the FB pin to adjust the working state of the direct current conversion chip U2, so that the output voltage or current reaches the expected set value.
In some embodiments, referring to fig. 1, the feedback circuit is composed of resistors R6, R7 and capacitor C13.
Optionally, the dc conversion module further includes a second capacitor set, and the feedback circuit is connected to the second capacitor set, and the second capacitor set is connected to the external load.
In this embodiment, the feedback circuit is connected to the second capacitor set, and the second capacitor set provides a filtering and smoothing effect between the output of the dc conversion chip U2 and the external load, so as to improve the power quality of the external load.
In some specific embodiments, the second capacitor set includes two capacitors of 10 μf and one capacitor of 100nF.
Optionally, an inductor is connected between the LX pin of the dc conversion chip U2 and the feedback circuit.
In this embodiment, an inductor is further connected between the LX pin of the dc conversion chip U2 and the feedback circuit, and the existence of the inductor can smooth the current waveform on the LX pin, reduce switching noise and ripple, and help to improve stability and ripple performance of the output voltage. And the existence of the inductor can reduce the signal delay between the LX pin and the feedback circuit to a certain extent, thereby being beneficial to responding to the changed working condition more quickly and improving the dynamic response performance of direct current conversion.
In some specific embodiments, the inductance is a 0.1 μF ceramic capacitor.
Optionally, the output voltage of the dc conversion module is 3.8V.
Optionally, the working voltage of the high-voltage battery VBAT7V4 is 7V-8.4V.
In this embodiment, the working voltage range of the dual-string high-voltage battery is 7V-8.4V, the working voltage of the usb power supply VBUS is 5V, and the voltage is converted into vcc_core of 3.8V through the dc conversion module.
Optionally, the MOS transistor Q1 is a P-channel MOS transistor Q1.
In this embodiment, the type of the MOS transistor Q1 is GPK2333, which is a P-channel MOS transistor Q1, where the P-channel MOS transistor Q1 is composed of a P-type substrate, an N-type doped region (source), and an N-type doped region (drain), and the P-type region between the two N-type regions forms a channel for controlling current flow, and the P-channel MOS transistor Q1 has advantages of low power consumption, high input impedance, high speed, and the like, and the P-channel MOS transistor Q1 is selected to further reduce the loss of the power supply circuit.
The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model.
Claims (10)
1. A power supply circuit for reducing power consumption of a battery and a USB, the power supply circuit comprising:
the device comprises a high-voltage battery, a USB power supply, a first diode, a second diode, a MOS transistor and a direct current conversion module;
the high-voltage battery is connected with the first diode, the high-voltage battery is connected with the drain electrode of the MOS transistor, the first diode is connected with the MOS transistor in parallel, the sources of the first diode and the MOS transistor are connected with the input end of the direct current conversion module, and the grid electrode of the MOS transistor is grounded; the USB power supply is connected with the second diode, the second diode is connected with the input end of the direct current conversion module, and the output end of the direct current conversion module is connected with an external load.
2. The power supply circuit of claim 1, wherein the dc conversion module comprises a dc conversion chip and a first capacitor bank, the first diode, the MOS transistor, and the second diode being in series with the first capacitor bank, the first capacitor bank being connected to a VIN pin of the dc conversion chip.
3. The power supply circuit of claim 2, wherein the dc conversion module further comprises an enable circuit, the enable circuit being connected to an EN pin of the dc conversion chip.
4. The power supply circuit of claim 2, wherein a bootstrap capacitor is connected between the LX pin and the BS pin of the dc conversion chip.
5. The power supply circuit of claim 2, wherein the dc conversion module further comprises a feedback circuit, the feedback circuit being connected to the FB pin of the dc conversion chip.
6. The power supply circuit of claim 5, wherein the dc conversion module further comprises a second capacitor bank, the feedback circuit being coupled to the second capacitor bank, the second capacitor bank being coupled to the external load.
7. The power supply circuit of claim 5, wherein an inductance is connected between the LX pin of the dc conversion chip and the feedback circuit.
8. The power supply circuit according to any one of claims 1 to 7, wherein an output voltage of the dc conversion module is 3.8V.
9. The power supply circuit according to any one of claims 1 to 7, characterized in that the power supply circuit of the high-voltage batteryAt a voltage of 7V ～ 8.4V。
10. The power supply circuit according to any one of claims 1 to 7, wherein the MOS transistor is a P-channel MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322173718.8U CN220732416U (en) | 2023-08-11 | 2023-08-11 | Power supply circuit capable of reducing power supply loss of battery and USB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322173718.8U CN220732416U (en) | 2023-08-11 | 2023-08-11 | Power supply circuit capable of reducing power supply loss of battery and USB |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220732416U true CN220732416U (en) | 2024-04-05 |
Family
ID=90501266
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322173718.8U Active CN220732416U (en) | 2023-08-11 | 2023-08-11 | Power supply circuit capable of reducing power supply loss of battery and USB |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220732416U (en) |
-
2023
- 2023-08-11 CN CN202322173718.8U patent/CN220732416U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102111070B (en) | The regulator over-voltage protection circuit that standby current reduces | |
| CN109787318B (en) | Discharge circuit and electronic equipment | |
| US9391467B2 (en) | Step-up battery charging management system and control method thereof | |
| CN104218646B (en) | A kind of portable power source charging circuit | |
| US9152161B2 (en) | Maintain power signature (MPS) powered device (PD) | |
| US20100277147A1 (en) | Switching power supply circuitry | |
| CN100430855C (en) | Constant voltage power supply | |
| TW201331743A (en) | Integrated circuit device with two voltage regulators | |
| GB2416606A (en) | Power supply circuit for portable battery powered device | |
| CN110875686B (en) | Electronic converter and method of operating an electronic converter | |
| CN104038040A (en) | Soft turn-off control module, reference signal generation unit, power converter and related control method | |
| CN102055323A (en) | Power supply controller and method | |
| US11575324B2 (en) | Control method and control circuit for a boost converter | |
| CN101120618A (en) | A power supply | |
| CN112953194B (en) | Low-voltage starting circuit | |
| KR102068843B1 (en) | Dc-dc converter | |
| CN102739044B (en) | DC/DC boost converter and LED driver | |
| CN105099184A (en) | Light-load switching power supply chip | |
| US9977445B2 (en) | Low power standby mode for buck regulator | |
| CN111600481B (en) | Voltage boosting and reducing control system of power supply and control method thereof | |
| CN220732416U (en) | Power supply circuit capable of reducing power supply loss of battery and USB | |
| US20110127978A1 (en) | Pwm controller with low uvlo voltage | |
| US20100164391A1 (en) | Power supply apparatus and method for amoled | |
| CN203491731U (en) | Charging control circuit and electronic equipment | |
| CN101950993A (en) | Lithium battery charger and DC voltage-stabilizing power supply integrated circuit system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |