CN208508789U - A kind of miniaturization low power consumption switch power starting circuit - Google Patents
A kind of miniaturization low power consumption switch power starting circuit Download PDFInfo
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- CN208508789U CN208508789U CN201821298553.XU CN201821298553U CN208508789U CN 208508789 U CN208508789 U CN 208508789U CN 201821298553 U CN201821298553 U CN 201821298553U CN 208508789 U CN208508789 U CN 208508789U
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Abstract
The utility model relates to a kind of miniaturization low power consumption switch power starting circuits, including linear voltage regulator, control switch circuit, switching power circuit, capacitor C2, control circuit and power switch circuit, the input terminal of the linear voltage regulator connects to power supply, the first end of the output end and capacitor C2 of its output end and switching power circuit connects, the second end of capacitor C2 is grounded, the input terminal of the control circuit is connect with the first end of capacitor C2, its output end is connected through the reference edge of control switch circuit and linear voltage regulator, the input terminal of the power switch circuit is connect with the first end of capacitor C2, the feeder ear of the PWM controller of its output end and switching power circuit connects.The utility model is suitable for various Switching Power Supplies or DC/DC converter, can be under high input voltage or system compact occasion, while guaranteeing that product normally exports, reduce the size of power module, power consumption is reduced, circuit reliability is improved, provides guarantee safely for system.
Description
Technical field
The utility model relates to power technique fields, and in particular to a kind of miniaturization low power consumption switch power starting circuit.
Background technique
Switching Power Supply is widely used in space flight, aviation, ship, weapons, electricity as the DC/DC converter of secondary system power supply
In the military-civil electronic system such as son, railway, communication, medical electronics, industrial automation equipment.In Switching Power Supply design, PWM control
Device processed or the power supply circuit of control circuit have a great impact to power module design.In the not high field of some technical requirements
It closes, simplest power supply circuit is exactly by the way of linear voltage stabilization power supply.But with the miniaturization of electronic system, power supply mould
The size of block is smaller and smaller, and input voltage is higher and higher, and linear voltage stabilization power supply mode can not meet the design of power module
It is required that.
Utility model content
The purpose of this utility model is to provide a kind of miniaturization low power consumption switch power starting circuits, can be realized high pressure
Under input condition, the low-power consumption power supply circuit of miniaturization is designed, and provides the supply voltage of high reliability to product.
To achieve the above object, the utility model uses following technical scheme:
A kind of miniaturization low power consumption switch power starting circuit, including linear voltage regulator, control switch circuit, Switching Power Supply
Circuit, capacitor C2, control circuit and power switch circuit, the input terminal of the linear voltage regulator connect to power supply, output end
It is connect with the first end of the output end of switching power circuit and capacitor C2, the second end ground connection of capacitor C2, the control circuit
Input terminal is connect with the first end of capacitor C2, and output end is connected through the reference edge of control switch circuit and linear voltage regulator, institute
The input terminal for stating power switch circuit is connect with the first end of capacitor C2, the PWM controller of output end and switching power circuit
Feeder ear connection.
As a further improvement of the above technical scheme:
The linear voltage regulator includes field effect transistor Q3, current-limiting resistance R1, zener diode Z1 and decoupling capacitance C1,
The drain of the field effect transistor Q3 connects to power supply, and source electrode is connect with the first end of capacitor C2, grid and pressure stabilizing two
The first end connection of the cathode and decoupling capacitance C1 of pole pipe Z1, the anode of zener diode Z1 and the second end of decoupling capacitance C1 are equal
It is connect with the output end of control switch circuit.
The switching power circuit 2 includes PWM controller, field effect transistor Q4, transformer T1 and diode D1, described
Power switch circuit uses field effect transistor Q2；The feeder ear of the PWM controller and the drain of field effect transistor Q2 connect
It connects, the output end OUT of PWM controller is connected with the grid of field effect transistor Q4；The drain electrode and transformation of field effect transistor Q4
One end of the primary coil of device T1 is connected, and the source electrode of field effect transistor Q4 is connected with input ground；The primary coil of transformer T1
The other end is connected with the anode of diode D1, and the cathode of diode D1 is connect with the first end of capacitor C2, the field effect transistor
The source electrode of pipe Q2 is connect with the first end of capacitor C2, and grid is connect with linear voltage regulator.
The control switch circuit includes field effect transistor Q1 and discharge resistance R2；The drain electrode of field effect transistor Q1 point
It is not connected with the grid of field effect transistor Q2, Q3, the source electrode ground connection of field effect transistor Q1, the grid of field effect transistor Q1
It is connected with the output end of control circuit, the first end of discharge resistance R2 is connect with the grid of field effect transistor Q1, discharge resistance
The second end of R2 is connect with the source electrode of field effect transistor Q1.
The control circuit includes digitial controller and linear voltage regulator, the control terminal and field-effect of the digitial controller
The grid of transistor Q1 connects, and the output end of feeder ear and linear voltage regulator connects, the input terminal and capacitor of linear voltage regulator
The first end of C2 connects.
As shown from the above technical solution, the low power consumption switch power starting circuit in the utility model is linear steady by monitoring
Depressor output voltage, when output voltage reaches certain voltage, so that digitial controller MCU enters normal operating conditions, number
Controller MCU turns off linear voltage regulator by control switch, and starts switch the work of power supply simultaneously.Entire control circuit principle
Structure is simple, and long-term work state, power consumption very little is not present in linear regulator circuit, and high reliablity occupies little space.Linear
Voltage-stablizer shutdown after and Switching Power Supply work normally early period between, the power supply of control circuit is powered by capacitor C2, so electric
Hold a little bigger capacitor of C2 selection capacity；The start-up study of Simultaneous Switching electric power output voltage and starting time to design it is small as far as possible,
Be conducive to the Miniaturization Design of Switching Power Supply in this way.
Detailed description of the invention
Fig. 1 is the circuit block diagram of the utility model；
Fig. 2 is the circuit diagram of the utility model.
Specific embodiment
The utility model is described further with reference to the accompanying drawing:
As shown in Figure 1, the miniaturization low power consumption switch power starting circuit of the present embodiment, including linear voltage regulator 1, control
Switching circuit 3, switching power circuit 2, capacitor C2, control circuit 4 and power switch circuit 5, the input terminal of linear voltage regulator 1 with
Power supply connection, the output end of linear voltage regulator 1 are connect with the first end of the output end of switching power circuit 2 and capacitor C2, capacitor
The second end of C2 is grounded, and the input terminal of control circuit 4 is connect with the first end of capacitor C2, and the output end of control circuit 4 is through controlling
Switching circuit 3 is connect with the reference edge of linear voltage regulator 1, and the input terminal of power switch circuit 5 is connect with the first end of capacitor C2,
The output end of power switch circuit 5 is connect with the feeder ear of the PWM controller of switching power circuit 2.
The input terminal of the control switch circuit 3 is connected with the output end of control circuit 4, the output end of control switch circuit 3
It is connected with the reference edge of linear voltage regulator 1, which is used for when voltage reaches certain voltage on C2, turns off line
Property voltage-stablizer 1 work, reduce the power consumption of power supply.Control circuit 4 is used to generate the control signal of control linear voltage regulator shutdown.Function
The supply voltage that rate switching circuit 5 is used to control PWM controller is connected to capacitor C2, to open the normal work of Switching Power Supply 2
Make.
As shown in Fig. 2, linear voltage regulator 1 include power field effect transistor Q3, current-limiting resistance R1, zener diode Z1 and
The drain of decoupling capacitance C1, power field effect transistor Q3 connect to power supply, the source electrode and capacitor of power field effect transistor Q3
The first end of C2 connects, and the first of the grid of power field effect transistor Q3 and the cathode of zener diode Z1 and decoupling capacitance C1
End connection, the anode of zener diode Z1 and the second end of decoupling capacitance C1 are connect with the output end of control switch circuit.It should
Linear voltage regulator 1 is for generating a stable initial supply voltage, for providing control switch circuit 3 stable power supply electricity
Pressure.
Switching power circuit 2 includes PWM controller, power field effect transistor Q4, transformer T1 and diode D1, power
Switching circuit uses power field effect transistor Q2；The feeder ear of PWM controller is connect with the drain of field effect transistor Q2,
The output end OUT of PWM controller is connected with the grid of power field effect transistor Q4；The drain electrode of power field effect transistor Q4 with
One end of the primary coil of transformer T1 is connected, and the source electrode of power field effect transistor Q4 is connected with input ground；Transformer T1's
The primary coil other end is connected with the anode of diode D1, and the cathode of diode D1 is connect with the first end of capacitor C2, field-effect
The source electrode of transistor Q2 is connect with the first end of capacitor C2, and grid is connect with linear voltage regulator.The switching power circuit 2 is used for
Power supply generates reliable and stable supply voltage after normally starting；
Control switch circuit 3 includes field effect transistor Q1 and discharge resistance R2；The drain electrode of field effect transistor Q1 is distinguished
Be connected with the grid of field effect transistor Q2, Q3, the source electrode of field effect transistor Q1 ground connection, the grid of field effect transistor Q1 with
The output end of control circuit is connected, and the first end of discharge resistance R2 is connect with the grid of field effect transistor Q1, discharge resistance R2
Second end connect with the source electrode of field effect transistor Q1.
Control circuit 4 includes digitial controller MCU and linear voltage regulator, the control terminal Ctrl of digitial controller MCU and field
The grid of effect transistor Q1 connects, and the feeder ear VDD of digitial controller MCU and the output end of linear voltage regulator connect, linearly
The input terminal IN of voltage-stablizer is connect with the first end of capacitor C2.The effect of control circuit 4 is when voltage reaches certain on capacitor C2
When voltage value, control exports control signal and gives control switch circuit 3 circuit.
Working principle: when Switching Power Supply has just started booting power-up, input voltage is by field effect transistor Q3 to capacitor
C2 charges, and the grid voltage of the voltage follow field effect transistor Q3 on capacitor C2 changes (voltage and field-effect on capacitor
Transistor Q3 grid voltage differs Vgsth), since field effect transistor Q3 grid connects zener diode Z1, so its grid
The voltage eventually stable VZ1 on fixed voltage.When the voltage on capacitor C2 by linear voltage regulator pressure stabilizing output after, reach
When digitial controller MCU works normally power reguirements, digitial controller MCU enters low-power consumption mode work, digital control at this time
The control signal control field effect transistor Q1 that device MCU exports high level is open-minded.Once field effect transistor Q1 is open-minded, capacitor C1
On voltage can be discharged to 0V or so.When the voltage on capacitor C1 is 0V, the field effect transistor Q3 of linear voltage regulator 1 is closed
Disconnected, the field effect transistor Q2 in power switch circuit 5 is open-minded.When field effect transistor Q3 shutdown and field effect transistor Q2 are opened
Logical moment, the PWM controller power supply in control circuit 4 and switching power circuit 2 are obtained from capacitor C2, and capacitor C2 is without filling at this time
Electrical circuit.When field effect transistor Q2 is opened, the power supply of voltage input PWM controller into Switching Power Supply 2 on capacitor C2
It holds on VDD, works to start switching power circuit 2.After switching power circuit 2 works normally, switch power supply
2 output voltage of road charges to capacitor C2 by diode D1, so that voltage stabilization on capacitor C2, so far entire power supply
Start-up course is completed, and product enters steady state operating conditions.
Switching Power Supply low-power consumption start-up circuit described in the utility model and method are suitable for various Switching Power Supplies or DC/
DC converter, can under high input voltage or system compact occasion, guarantee product normally export while, power module
Size can design very little, and power consumption can be down to very low, to improve circuit reliability, provide guarantee safely for system.
Embodiment described above is only that preferred embodiments of the present invention are described, not practical to this
Novel range is defined, and under the premise of not departing from the spirit of the design of the utility model, those of ordinary skill in the art are to this
The various changes and improvements that the technical solution of utility model is made should all fall into the protection that the utility model claims book determines
In range.
Claims (5)
1. a kind of miniaturization low power consumption switch power starting circuit, it is characterised in that: including linear voltage regulator, control switch electricity
Road, switching power circuit, capacitor C2, control circuit and power switch circuit, the input terminal and power supply of the linear voltage regulator connect
It connects, the first end connection of the output end and capacitor C2 of output end and switching power circuit, the second end ground connection of capacitor C2 is described
The input terminal of control circuit is connect with the first end of capacitor C2, benchmark of the output end through control switch circuit and linear voltage regulator
End connection, the input terminal of the power switch circuit connect with the first end of capacitor C2, output end and switching power circuit
The feeder ear of PWM controller connects.
2. miniaturization low power consumption switch power starting circuit according to claim 1, it is characterised in that: the linear voltage stabilization
Device includes field effect transistor Q3, current-limiting resistance R1, zener diode Z1 and decoupling capacitance C1, the field effect transistor Q3's
Drain connects to power supply, and source electrode is connect with the first end of capacitor C2, cathode and the decoupling electricity of grid and zener diode Z1
Hold the first end connection of C1, the output of the anode of zener diode Z1 and the second end of decoupling capacitance C1 with control switch circuit
End connection.
3. miniaturization low power consumption switch power starting circuit according to claim 1, it is characterised in that: the Switching Power Supply
Circuit 2 includes PWM controller, field effect transistor Q4, transformer T1 and diode D1, and the power switch circuit is imitated using field
Answer transistor Q2；The feeder ear of the PWM controller is connect with the drain of field effect transistor Q2, the output end of PWM controller
OUT is connected with the grid of field effect transistor Q4；One end of the primary coil of the drain electrode and transformer T1 of field effect transistor Q4
It is connected, the source electrode of field effect transistor Q4 is connected with input ground；The primary coil other end of transformer T1 and the sun of diode D1
Extremely it is connected, the cathode of diode D1 is connect with the first end of capacitor C2, and the source electrode of the field effect transistor Q2 is with capacitor C2's
First end connection, grid are connect with linear voltage regulator.
4. miniaturization low power consumption switch power starting circuit according to claim 1, it is characterised in that: the control switch
Circuit includes field effect transistor Q1 and discharge resistance R2；The drain electrode of field effect transistor Q1 respectively with field effect transistor Q2,
The grid of Q3 is connected, the source electrode ground connection of field effect transistor Q1, the grid of field effect transistor Q1 and the output end of control circuit
It is connected, the first end of discharge resistance R2 is connect with the grid of field effect transistor Q1, the second end and field-effect of discharge resistance R2
The source electrode of transistor Q1 connects.
5. miniaturization low power consumption switch power starting circuit according to claim 1, it is characterised in that:
The control circuit includes digitial controller and linear voltage regulator, the control terminal and field effect transistor of the digitial controller
The grid of pipe Q1 connects, and the output end of feeder ear and linear voltage regulator connects, and the input terminal of linear voltage regulator is with capacitor C2's
First end connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821298553.XU CN208508789U (en) | 2018-08-13 | 2018-08-13 | A kind of miniaturization low power consumption switch power starting circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821298553.XU CN208508789U (en) | 2018-08-13 | 2018-08-13 | A kind of miniaturization low power consumption switch power starting circuit |
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| CN208508789U true CN208508789U (en) | 2019-02-15 |
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| CN201821298553.XU Active CN208508789U (en) | 2018-08-13 | 2018-08-13 | A kind of miniaturization low power consumption switch power starting circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832807A (en) * | 2018-08-13 | 2018-11-16 | 中国电子科技集团公司第四十三研究所 | A kind of miniaturization low power consumption switch power starting circuit and starting method |
| CN113691116A (en) * | 2021-08-25 | 2021-11-23 | 重庆梅安森科技股份有限公司 | Power supply controller start control system |
| CN114035637A (en) * | 2021-11-16 | 2022-02-11 | 中国电子科技集团公司第二十四研究所 | Starting power supply circuit, power supply method of starting power supply circuit and starting power supply device |
-
2018
- 2018-08-13 CN CN201821298553.XU patent/CN208508789U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832807A (en) * | 2018-08-13 | 2018-11-16 | 中国电子科技集团公司第四十三研究所 | A kind of miniaturization low power consumption switch power starting circuit and starting method |
| CN113691116A (en) * | 2021-08-25 | 2021-11-23 | 重庆梅安森科技股份有限公司 | Power supply controller start control system |
| CN113691116B (en) * | 2021-08-25 | 2024-01-26 | 重庆梅安森科技股份有限公司 | Power supply controller start control system |
| CN114035637A (en) * | 2021-11-16 | 2022-02-11 | 中国电子科技集团公司第二十四研究所 | Starting power supply circuit, power supply method of starting power supply circuit and starting power supply device |
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