CN219740035U - Standby power supply control circuit - Google Patents
Standby power supply control circuit Download PDFInfo
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- CN219740035U CN219740035U CN202320644189.2U CN202320644189U CN219740035U CN 219740035 U CN219740035 U CN 219740035U CN 202320644189 U CN202320644189 U CN 202320644189U CN 219740035 U CN219740035 U CN 219740035U
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- 238000001514 detection method Methods 0.000 claims abstract description 44
- 239000003990 capacitor Substances 0.000 claims description 35
- 230000005669 field effect Effects 0.000 claims description 4
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- 238000007599 discharging Methods 0.000 description 2
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Abstract
The utility model discloses a standby power supply control circuit, which comprises: the power-down detection circuit is connected with the output end of the power-down detection circuit, and the other end of the control circuit is connected with the input end of the booster circuit; the output end of the booster circuit is connected with the power supply end of the electric equipment; the input end of the power failure detection circuit is connected with a main power supply of the electric equipment. The circuit provided by the utility model controls the standby power supply of the electric equipment, so that the power supply system is stable.
Description
Technical Field
The utility model relates to the technical field of electric power, in particular to a standby power supply control circuit.
Background
With the rapid development of industrial technology, the types and the number of electric equipment are gradually increased, the demand for power supply is more and more increased, and for a system using alternating current commercial power, the system often needs to react at the moment of power failure of the commercial power. The energy controller is used as a terminal product of the power utilization system to timely collect and report the power failure data of the mains supply.
In the prior art, a super capacitor is added in an energy controller, and the super capacitor directly supplies power to a system after the mains supply is powered down until the super capacitor is discharged. However, in the continuous power supply process of the super capacitor, the power supply system may be in an unstable state along with the discharge of the super capacitor, so that the normal use of the electric equipment is affected.
Disclosure of Invention
Therefore, the utility model aims to solve the technical problem that the normal use of electric equipment is affected due to unstable state of a power supply system in the discharging process of a super capacitor in the prior art, and provides a standby power supply control circuit.
According to a first aspect, the present utility model provides a standby power control circuit comprising: control circuit, power down detection circuit and boost circuit, wherein,
one end of the control circuit is connected with the output end of the power failure detection circuit, and the other end of the control circuit is connected with the input end of the booster circuit;
the output end of the booster circuit is connected with the power supply end of the electric equipment;
the input end of the power failure detection circuit is connected with a main power supply of the electric equipment.
In one embodiment, the control circuit includes a first controlled switch, a second controlled switch, a third controlled switch, and a controller.
In an embodiment, the control end of the first controlled switch is connected with the output end of the power failure detection circuit, the first end is grounded, and the second end is connected with the control end of the second controlled switch;
the control end of the second controlled switch is also connected with the output end of the controller, the first end is grounded, and the second end is connected with the control end of the third controlled switch;
the first end of the third controlled switch is connected with the output end of the standby power supply of the electric equipment, and the second end of the third controlled switch is connected with the input end of the boost circuit;
the output end of the booster circuit is also connected with the power supply end of the controller.
In one embodiment, the power down detection circuit comprises a voltage division circuit and a low voltage detection chip, wherein,
the first end of the voltage dividing circuit is connected with a main power supply of electric equipment, and the second end of the voltage dividing circuit is connected with the low-voltage detection chip;
the output end of the low-voltage detection chip is connected with the control end of the first controlled switch.
In one embodiment, the BOOST circuit is a BOOST circuit.
In one embodiment, the BOOST circuit includes: a first diode, a second diode, a DC/DC power circuit, a first capacitor, a second capacitor, an inductor, a first resistor, a second resistor, a third resistor and a fourth resistor, wherein,
the forward ends of the first diode and the second diode are connected with the second end of the DC/DC power supply circuit, and the reverse ends of the first diode and the second diode are connected with a power supply;
the first end of the DC/DC power supply circuit is connected with the first capacitor, the second end of the DC/DC power supply circuit is also connected with the first resistor, the third end of the DC/DC power supply circuit is connected with the inductor, the fourth end of the DC/DC power supply circuit is grounded, the fifth end of the DC/DC power supply circuit is connected with the second resistor and the third resistor, the sixth end of the DC/DC power supply circuit is connected with the second capacitor, and the seventh end of the DC/DC power supply circuit is connected with the fourth resistor.
In one embodiment, the backup power source is a super capacitor.
In an embodiment, the controller is a single-chip microcomputer.
In an embodiment, the first and second controlled switches are transistors.
In an embodiment, the third controlled switch is a field effect transistor.
The technical scheme of the utility model has the following advantages:
according to the standby power supply control circuit, the third controlled switch in the control circuit is connected with the standby power supply of the electric equipment, and the control circuit controls the standby power supply of the electric equipment according to the detection result of the power failure detection circuit, so that the voltage of the standby power supply is not supplied to the system when the voltage is lower than the working voltage, and the power supply system is in a stable state in the power supply process, so that the normal use of the electric equipment is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of the overall structure of a standby power control circuit provided by an embodiment of the present utility model;
fig. 2 is a circuit configuration diagram of a control circuit provided in an embodiment of the present utility model;
FIG. 3 is a circuit configuration diagram of a power down detection circuit provided by an embodiment of the present utility model;
fig. 4 is a circuit configuration diagram of a booster circuit according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The energy controller is used as a next-generation terminal product which is mainly pushed by the power utilization system and is an important component part of the low-voltage station area data acquisition system. With the enhancement of service awareness, the requirements for shortening the power failure repair time and improving the service quality are higher and higher. The energy controller is used as a terminal product for data acquisition and reporting, and strict requirements are put on reliable uploading of data at the time of power failure.
The current common practice is to add a super capacitor in the energy controller, and the super capacitor directly supplies power to the system after the mains supply is powered down until the super capacitor is discharged, however, the power supply system of the processor may be in an unstable state along with the discharge of the super capacitor in the power supply process, and the processor may cause data errors and the system program is disordered when working in a critical voltage state.
The embodiment of the utility model provides a standby power supply control circuit, which comprises a control circuit 1, a power failure detection circuit 2 and a booster circuit 3 as shown in fig. 1.
The input end of the power failure detection circuit 2 is connected with a main power supply of the electric equipment, and is used for detecting whether the main power supply of the electric equipment is powered down or not and outputting a power failure detection result. The main power source of the electric equipment can be mains supply or other power sources, and is not limited herein.
The control circuit 1 is a MOS control circuit, and one end of the control circuit 1 is connected to the output end of the power-down detection circuit 2, and is configured to receive the power-down detection result sent by the power-down detection circuit 2, and control the standby power supply 4 according to the power-down detection result. The standby power supply 4 may be a super capacitor, or may be other power supply devices capable of supplying power, which is not limited herein.
The other end of the control circuit 1 is connected with the input end of the boost circuit 3, the boost circuit 3 supplies power to the control circuit 1, and the boost circuit 3 stacks capacitor discharge voltage and power supply voltage through electronic elements such as a bootstrap boost diode, a bootstrap boost capacitor and the like, so that the voltage is increased.
According to the standby power supply control circuit, the third controlled switch in the control circuit is connected with the standby power supply of the electric equipment, and the control circuit controls the standby power supply of the electric equipment according to the detection result of the power failure detection circuit, so that the voltage of the standby power supply is not supplied to the system when the voltage is lower than the working voltage, and the power supply system is in a stable state in the power supply process, so that the normal use of the electric equipment is ensured.
Specifically, as shown in fig. 2, the control circuit 1 includes a first controlled switch V1, a second controlled switch V2, a third controlled switch U3, and a controller (not shown in the figure) connected through a pbo_pwren interface in the control circuit 1.
The first controlled switch V1 and the second controlled switch V2 may be transistors, or may be other components that can achieve this function, which is not limited herein. The third controlled switch U3 may be a field effect transistor, or may be other components that can achieve this function, which is not limited herein. The control end of the first controlled switch V1 is connected with the output end of the power failure detection circuit 2, the first end is grounded, and the second end is connected with the control end of the second controlled switch V2. The control end of the second controlled switch V2 is also connected with the output end of the controller, the first end is grounded, and the second end is connected with the control end of the third controlled switch U3. The first end of the third controlled switch U3 is connected with the output end of the standby power supply 4 of the electric equipment, and the second end of the third controlled switch U is connected with the input end of the boost circuit 3 through a VBACK interface. The first controlled switch V1 and the second controlled switch V2 may be 2SC1623, or may be any other type of transistor, which is not limited herein. The third controlled switch U3 may be a DMP3056LSD, or may be a field effect transistor of another type, which is not limited herein.
In an embodiment, the power failure detection circuit 2 includes a voltage division circuit and a low voltage detection chip U2, where a first end of the voltage division circuit is connected to a main power supply of the electric device, and a second end of the voltage division circuit is connected to the low voltage detection chip U2; the output end of the low voltage detection chip U2 is connected with the control end of the first controlled switch V1 through a PWR_DOWN interface. The low voltage detection chip U2 is used for detecting the voltage of the switching power supply, outputting a low level when the voltage of the switching power supply is lower than the normal working voltage, and outputting a high level when the voltage of the switching power supply is higher than the normal working voltage.
Specifically, as shown in fig. 3, the voltage dividing circuit includes a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8, where one end of the sixth resistor R6 is connected to a 5.8V main power supply of the electric device, and the other end is connected to the seventh resistor R7. The 5.8V main power supply is divided by a sixth resistor R6, a seventh resistor R7 and an eighth resistor R8. A third capacitor C3 is connected between the 1 interface and the 3 interface of the low-voltage detection chip U2, one end of the 2 interface of the low-voltage detection chip U2 is connected with a ninth resistor R9, the other end of the 2 interface of the low-voltage detection chip U is connected with the control circuit 1 through a PWR_DOWN port, and the other end of the ninth resistor R9 is grounded.
The low voltage detection chip U2 may be SP809EK-L-2-9 or other types of chips, which is not limited herein.
In an embodiment, the BOOST circuit 3 is a BOOST circuit, and the BOOST circuit is a switch dc BOOST circuit, so that the output voltage is higher than the input voltage, and the output end of the BOOST circuit 3 is connected to the power supply end of the controller and the power supply end of the electric device respectively.
Specifically, as shown in fig. 4, the BOOST circuit includes a first diode D1, a second diode D2, a DC/DC power supply circuit, a first capacitor C1, a second capacitor C2, an inductance L, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The forward ends of the first diode D1 and the second diode D2 are connected to the second end of the DC/DC power supply circuit, and the reverse ends are connected to a 5.5V power supply.
The DC/DC power supply circuit may be a chip U1 with a model MP3437GJ, taking the chip U1 with a model MP3437GJ as an example, a first end of the MP3437GJ chip U1 is connected to the first capacitor C1, and C1 is a bootstrap capacitor; the second end is connected to the first resistor R1; the third end is a converter switch pin and is connected with the inductor L; the fourth end is grounded; the fifth end is feedback input and is connected with the second resistor R2 and the third resistor R3; the sixth end internal bias power supply is connected to the second capacitor C2; the seventh end is connected to the fourth resistor R4; the eighth end is a voltage input, connected to the VBACK interface, and connected to the control circuit 1 through the VBACK interface.
When the system is powered on and then outputs 5.8V, the power-DOWN detection circuit 2 detects that the output of the switch power supply is larger than 4.93V, and the PWR_DOWN outputs a high level. The PB0_PWREN interface of the control circuit 1 is a controller control IO interface, and the power-on output is high at the moment. The switch power supply is a main power supply of the electric equipment, the controller can be a single chip microcomputer or other control terminals, and the switch power supply is not limited herein.
After the energy controller is electrified for 30 minutes, the super capacitor is charged, when the PWR_DOWN outputs a high level, the V1 triode is conducted to the ground, the V2 triode is turned off, the grid source electrode of the U3 switch PMOS tube is turned off at a high level, and at the moment, the booster circuit 3 has no input voltage.
When the mains supply is powered DOWN and the power failure detection circuit 2 detects that the output of the switching power supply is smaller than 4.93V, the PWR_DOWN interface of the power failure detection circuit 2 outputs a low level, at the moment, the V1 triode is turned off, the Pb0_PWREN is in a high level, so that the V2 is conducted to the ground, the grid and the source of the PMOS tube are conducted in a low level, and the booster circuit 3 works to output 5.7V.
When the singlechip detects a power-down signal and starts timing, when the working time reaches 200s, PB0_PWREN becomes low level, V2 is turned off, the grid and source electrodes of the PMOS tubes are turned off at high level, and the standby power supply 4 stops supplying power.
When the commercial power is powered down, the working voltage of the super capacitor is lower than 2.7V, or the charging and discharging voltage of the super capacitor is lower than 0.8V, the booster circuit 3 is automatically turned off, and the single chip microcomputer does not work the PMOS tube to be turned off at the moment, so that the super capacitor does not supply power to the processor when the voltage of the super capacitor is lower than the working voltage of the booster circuit 3, the super capacitor is ensured to be in a normal working range, and the power supply system is in a stable working voltage state.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (8)
1. A standby power control circuit, comprising: control circuit, power down detection circuit and boost circuit, wherein,
one end of the control circuit is connected with the output end of the power failure detection circuit, and the other end of the control circuit is connected with the input end of the booster circuit;
the output end of the booster circuit is connected with the power supply end of the electric equipment;
the input end of the power failure detection circuit is connected with a main power supply of the electric equipment;
the control circuit comprises a first controlled switch, a second controlled switch, a third controlled switch and a controller;
the control end of the first controlled switch is connected with the output end of the power failure detection circuit, the first end is grounded, and the second end is connected with the control end of the second controlled switch;
the control end of the second controlled switch is also connected with the output end of the controller, the first end is grounded, and the second end is connected with the control end of the third controlled switch;
the first end of the third controlled switch is connected with the output end of the standby power supply of the electric equipment, and the second end of the third controlled switch is connected with the input end of the boost circuit;
the output end of the booster circuit is also connected with the power supply end of the controller.
2. The circuit of claim 1, wherein the power down detection circuit comprises a voltage divider circuit and a low voltage detection chip, wherein,
the first end of the voltage dividing circuit is connected with a main power supply of electric equipment, and the second end of the voltage dividing circuit is connected with the low-voltage detection chip;
the output end of the low-voltage detection chip is connected with the control end of the first controlled switch.
3. The circuit of claim 1, wherein the BOOST circuit is a BOOST circuit.
4. The circuit of claim 3, wherein the BOOST circuit comprises: a first diode, a second diode, a DC/DC power circuit, a first capacitor, a second capacitor, an inductor, a first resistor, a second resistor, a third resistor and a fourth resistor, wherein,
the forward ends of the first diode and the second diode are connected with the second end of the DC/DC power supply circuit, and the reverse ends of the first diode and the second diode are connected with a power supply;
the first end of the DC/DC power supply circuit is connected with the first capacitor, the second end of the DC/DC power supply circuit is also connected with the first resistor, the third end of the DC/DC power supply circuit is connected with the inductor, the fourth end of the DC/DC power supply circuit is grounded, the fifth end of the DC/DC power supply circuit is connected with the second resistor and the third resistor, the sixth end of the DC/DC power supply circuit is connected with the second capacitor, and the seventh end of the DC/DC power supply circuit is connected with the fourth resistor.
5. The circuit of claim 1, wherein the backup power source is a super capacitor.
6. The circuit of claim 1, wherein the controller is a single-chip microcomputer.
7. The circuit of claim 1, wherein the first and second controlled switches are transistors.
8. The circuit of claim 1, wherein the third controlled switch is a field effect transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320644189.2U CN219740035U (en) | 2023-03-28 | 2023-03-28 | Standby power supply control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320644189.2U CN219740035U (en) | 2023-03-28 | 2023-03-28 | Standby power supply control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219740035U true CN219740035U (en) | 2023-09-22 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320644189.2U Active CN219740035U (en) | 2023-03-28 | 2023-03-28 | Standby power supply control circuit |
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| CN (1) | CN219740035U (en) |
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- 2023-03-28 CN CN202320644189.2U patent/CN219740035U/en active Active
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Address after: Zhengtai Instrument Measurement Industrial Park, No.1 Liangce Road, Beibaixiang Town, Leqing City, Wenzhou City, Zhejiang Province, 325603 Patentee after: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. Address before: 325603 Wenzhou Daqiao Industrial Park, Yueqing City, Wenzhou City, Zhejiang Province Patentee before: ZHEJIANG CHINT INSTRUMENT & METER Co.,Ltd. |