CN208656636U - A kind of power control circuit - Google Patents
A kind of power control circuit Download PDFInfo
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- CN208656636U CN208656636U CN201821360062.3U CN201821360062U CN208656636U CN 208656636 U CN208656636 U CN 208656636U CN 201821360062 U CN201821360062 U CN 201821360062U CN 208656636 U CN208656636 U CN 208656636U
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- switch
- power
- power supply
- storage device
- energy storage
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Abstract
The utility model provides a kind of power control circuit, for regulating and controlling the voltage of power output end, including power supply, first switch M1, third switch M3, the 4th switch M4, energy storage device and working power, the power supply is connected by first switch M1 with energy storage device, a point N1 is drawn between the first switch M1 and energy storage device, which passes through third switch M3 and power output end VoutIt is connected, power output end VoutA point N2 is drawn between third switch M3, which is connected by the 4th switch M4 with working power.The utility model realizes overshoot protection when fast powering-up, and without introducing more additional devices, circuit structure is simple, generation it is low in energy consumption, while decreasing the occupancy to chip area, reduce costs, improve the compatibility of Switching Power Supply.
Description
Technical field
The utility model belongs to field of power supplies, and in particular to a kind of power control circuit.
Background technique
Switching Power Supply after the power-up, is limited, pre-driver circuitry can not be adjusted in time by output feed circuit response speed
Whole output voltage, causes output voltage to overshoot, and is easy to damage electrical equipment or component.
To prevent from overshooting, generallys use soft starting circuit and carry out overshoot protection, traditional soft starting circuit is in start-up circuit
Middle configuration generates the second reference voltage that voltage value is lower than actual reference voltage, is then suitably cut by the feedback of logic circuit
Actual reference voltage is changed to, to reduce or eliminate overshoot phenomenon.The technical solution circuit structure is complicated, the sampling of logic feedback,
Multilevel iudge needs the regular hour, and fast powering-up brings great challenge to the response speed of comparator, in particular for need
For the TOF sensor for wanting nanosecond high-speed starting, prior art is unable to satisfy on power-up speeds.
Moreover, voltage time-to-climb once the default later period can not be regulated and controled, constrains in traditional soft starting circuit
The compatibility of Switching Power Supply, while a variety of additional device circuitries also increase power consumption.
Summary of the invention
For the deficiencies in the prior art, the purpose of the utility model is to provide a kind of power control circuit, solutions
Certainly the prior art can not solve the technical issues of output voltage overshoots.
In order to solve the above-mentioned technical problem, the utility model adopts the following technical solution is achieved:
A kind of power control circuit, for regulating and controlling the voltage of power output end, including power supply, first switch M1, third are opened
It closes M3, the 4th switch M4, energy storage device and working power, the power supply to be connected by first switch M1 with energy storage device, institute
It states extraction one point N1, the point N1 between first switch M1 and energy storage device and passes through third switch M3 and power output end VoutIt is connected
It connects, power output end VoutA point N2 is drawn between third switch M3, which is connected by the 4th switch M4 with working power
It connects.
It further, further include second switch M2, point N1 is grounded by second switch M2.
It further, further include logic control element, the logic control element is opened with first respectively by a driver
M1, second switch M2, third switch M3 and the 4th switch M4 is closed to be connected.
Further, in power supply regulation process, when first switch M1 or third switch M3 are connected, second switch M2 or
4th switch M4 is disconnected；When first switch M1 or third switch M3 is disconnected, second switch M2 or the 4th switch M4 are connected.
Further, the first switch M1 and third switch M3 is also turned on or disconnects, the second switch M2 and
Four switch M4 are also turned on or disconnect.
Further, constant-current source is connected between the power supply and first switch M1.
Further, the energy storage device is variable capacitance.
Compared with prior art, beneficial has the technical effect that the utility model
(1) the utility model is combined by energy storage device with the timing control that circuit high speed switchs, according to current
Then rise time needed for the capacity of the energy storage device of selection obtains target voltage passes through the accurate control of timing, complete electricity
The switching in source realizes overshoot protection when fast powering-up.
(2) the utility model avoids the logic judgment process that sampling is compared, without introducing more additional devices, circuit
Structure is simple, generation it is low in energy consumption, while decreasing the occupancy to chip area, reduce costs.
(3) energy storage device is set to chip exterior by the utility model can meet different voltages by the adjusting of stored energy capacitance
The demand of time-to-climb and operating voltage improve the compatibility of Switching Power Supply.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the utility model；
Fig. 2 is the timing diagram of timing control unit output in the utility model；
Fig. 3 is the utility model output voltage ascending curve schematic diagram.
Explanation is further explained in detail to particular content of the invention below in conjunction with drawings and examples.
Specific embodiment
The utility model is made by timing control first switch M1, second switch M2, third switch M3 and the 4th switch M4
Energy storage device voltage close to operating voltage when, the phenomenon that being switched to real work power supply, prevent output end voltage from overshooting.
Specific embodiment of the utility model is given below, it should be noted that the utility model is not limited to following tool
Body embodiment, all equivalent transformations made on the basis of the technical solutions of the present application each fall within the protection scope of the utility model.
Embodiment:
The present embodiment provides a kind of power control circuit, as shown in Figure 1, the voltage for regulating and controlling power output end, including
Power supply, first switch M1, third switch M3, the 4th switch M4, energy storage device and working power, the power supply pass through first switch
M1 is connected with energy storage device, and a point N1 is drawn between the first switch M1 and energy storage device, which is switched by third
M3 and power output end VoutIt is connected, power output end VoutA point N2 is drawn between third switch M3, which passes through the
Four switch M4 are connected with working power.
The present embodiment further includes second switch M2, and point N1 is grounded by second switch M2.
First switch M1 is arranged between power vd D and energy storage device, for controlling the charging process of energy storage device, wherein
Voltage value at point N1 increases linearly over time, the power output end V when third switch M3 is connectedoutVoltage value be point N1
The voltage value at place.Energy storage device is by the reset during second switch M2 progress inoperative, during third switch M3 shutdown, the
Two switch M2 conducting all exports the charge stored in energy storage device, still can accurately be controlled by timing when to start next time
Power output end V processedoutThreshold value.
The present embodiment further includes logic control element, the logic control element by a driver respectively with first switch
M1, second switch M2, third switch M3 and the 4th switch M4 are connected.
First switch M1 is also turned on or disconnects with third switch M3, and the second switch M2 and the 4th switch M4 connects simultaneously
On-off is opened；
First switch M1, second switch M2, third switch M3 and the 4th switch M4 in the present embodiment can be any one
High-speed switching devices, the present embodiment is using metal-oxide-semiconductor.
Such as Fig. 2, in power supply regulation process, when first switch M1 or third switch M3 is connected, second switch M2 or the
Four switch M4 are disconnected；When first switch M1 or third switch M3 is disconnected, second switch M2 or the 4th switch M4 are connected.Work as logic
Control unit is according to VoutWhen time needed for linear rise to given threshold turns off third switch M3, the 4th switch is simultaneously turned on
M4 completes the switching of power supply.
Logic control element in the present embodiment uses programmable logic controller (PLC), and driver is used for according to programmable logic
The timing instructions that controller issues execute the on or off of switch, and the programmable logic controller (PLC) in the present embodiment can be
ASIC, CPLD, PAL, GAL etc., preferably FPGA.
Constant-current source is connected between power supply and first switch M1.
Energy storage device is variable capacitance.The filtering characteristic that cannot be mutated using variable capacitance both end voltage, when starting, are obtained
Stable linear rise output voltage Vout.It, can by regulation in addition, the variable capacitance setting of the present embodiment is in chip exterior
The capacitance that power transformation is held realizes the actual needs of different voltages time-to-climb and operating voltage.
Switching Power Supply simultaneously turns on when starting in zero moment first switch M1, third switch M3, by constant-current source to variable
Capacitor charging, VoutAs VN1Increase linearly over time；In t1Moment first switch M1, third switch M3 shutdown, while the 4th opens
M4 conducting is closed, completes the switching of power supply, the normal power supply after voltage small magnitude gently rises to required operating voltage, such as Fig. 3 institute
Show；Second switch M2 resets variable capacitance during third switch M3 is turned off, preferably in time with the shown in Fig. 2
Three switch M3 are complementary.The utility model can periodic cycle according to demand, 0~t shown in Fig. 22Moment is first power supply week
Phase.
t1Moment is calculated by the following formula:
Wherein, C is the capacitance of variable capacitance currently set, VThThe voltage threshold reached needed for rising for voltage linear
Value, VC0For the voltage value at M1 rising edge time N1, I is current value provided by constant-current source.V in the present embodimentC0It is 0.Its
In, VThValue range is the operating voltage V of required outputwork90%~99%, VworkBigger, percentage is higher.
Claims (7)
1. a kind of power control circuit, for regulating and controlling the voltage of power output end, which is characterized in that including power supply, first switch
M1, third switch M3, the 4th switch M4, energy storage device and working power, the power supply pass through first switch M1 and energy storage device
It is connected, a point N1 is drawn between the first switch M1 and energy storage device, which is exported by third switch M3 and power supply
Hold VoutIt is connected, power output end VoutA point N2 is drawn between third switch M3, which passes through the 4th switch M4 and work
It is connected as power supply.
2. power control circuit according to claim 1, which is characterized in that further include second switch M2, point N1 passes through the
Two switch M2 ground connection.
3. power control circuit according to claim 2, which is characterized in that it further include logic control element, the logic
Control unit is connected with first switch M1, second switch M2, third switch M3 and the 4th switch M4 respectively by a driver.
4. power control circuit according to claim 3, which is characterized in that in power supply regulation process, work as first switch
When M1 or third switch M3 is connected, second switch M2 or the 4th switch M4 are disconnected；When first switch M1 or third switch M3 is disconnected
When, second switch M2 or the 4th switch M4 are connected.
5. power control circuit according to claim 3, which is characterized in that the first switch M1 and third switch M3 are same
When be switched on or switched off, the second switch M2 and the 4th switch M4 is also turned on or disconnects.
6. power control circuit according to claim 1, which is characterized in that connected between the power supply and first switch M1
There is constant-current source.
7. power control circuit according to claim 1, which is characterized in that the energy storage device is variable capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821360062.3U CN208656636U (en) | 2018-08-22 | 2018-08-22 | A kind of power control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821360062.3U CN208656636U (en) | 2018-08-22 | 2018-08-22 | A kind of power control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208656636U true CN208656636U (en) | 2019-03-26 |
Family
ID=65791102
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821360062.3U Active CN208656636U (en) | 2018-08-22 | 2018-08-22 | A kind of power control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208656636U (en) |
-
2018
- 2018-08-22 CN CN201821360062.3U patent/CN208656636U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: 315500 Room 2212, 389 Yuelindong Road, Fenghua District, Ningbo City, Zhejiang Province Patentee after: Ningbo Feixin Electronic Technology Co., Ltd. Address before: 710000 West Avenue, Xi'an New Industrial Park, Shaanxi Province, No. 60 Graduate Education Center No. 9 Patentee before: Xi'an flying arrow Electronic Technology Co., Ltd. |
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| CP03 | Change of name, title or address |