CN108736691A - A kind of Switching Power Supply it is long when reset circuit and it is long when repositioning method - Google Patents
A kind of Switching Power Supply it is long when reset circuit and it is long when repositioning method Download PDFInfo
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- CN108736691A CN108736691A CN201710272002.XA CN201710272002A CN108736691A CN 108736691 A CN108736691 A CN 108736691A CN 201710272002 A CN201710272002 A CN 201710272002A CN 108736691 A CN108736691 A CN 108736691A
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- actuating
- actuating circuit
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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
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/22—Modifications for ensuring a predetermined initial state when the supply voltage has been applied
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- Control Of Voltage And Current In General (AREA)
Abstract
The invention discloses a kind of Switching Power Supply it is long when reset circuit and it is long when repositioning method.Reset circuit includes when described long：First actuating circuit, within resetting time, the second actuating circuit of control to send voltage control instructions to control chip；Chip is controlled, the voltage control instructions for being sent according to the second actuating circuit, the output voltage values for controlling power output end are less than preset voltage value；The load of Switching Power Supply is stopped when the voltage of power output end is below preset voltage value；Accumulator, within resetting time, powering for the first actuating circuit；Power output end, within resetting time, powering for the second actuating circuit.The present invention need not also increase in power output end and switch without using independent accessory power supply, and circuit structure is simple, realizes that difficulty is low, and improves power-efficient and reliability, reduces circuit cost.
Description
Technical field
The present invention relates to switch power technology field, more particularly to a kind of Switching Power Supply it is long when reset circuit and it is long when
Repositioning method.
Background technology
Currently, usually containing chip in the load of Switching Power Supply.Chip, which needs to reset at some, restarts, and chip
It is exactly power supply a period of time of cutting off the power to reset most effective and general method, is then powered on again, chip restarts naturally.This
Require that system sends out instruction to reset circuit when chip needs to reset, reset circuit upon receipt of the instructions, at one section
Between in close power supply of the power supply to loads such as chips.For Switching Power Supply, especially for mini-system and low power
For power supply, realize that the function is more difficult, since circuit function is simple, without management system in power supply, at this moment need into
The additional management of row.Currently, the mini-system and low power power supply generally use following methods for multichannel input reset：
Method 1, uses accumulator.
Circuit storage energy is held time with extending in order to control, theoretical feasible but performance difficulty.If control electricity will be resetted
Road and accumulator setting are in primary side, then multichannel, which inputs, will configure multiple accumulators, and the volume of each accumulator
It is larger, it is very big to circuit volume and cost impact using multiple accumulators.If reset control circuit and accumulator set
It sets on secondary side, then during reset, needs to transmit maintenance signal to primary side always, transmit and signal is maintained to expend a large amount of energy
Amount is realized difficult.
Method 2 uses independent accessory power supply
As shown in Figure 1, for using the structure chart of the reset circuit of independent power supply.Increase in reset circuit independent
Accessory power supply, when main power source is stopped, accessory power supply provides power supply, maintains the energy of reset circuit.It is done so that needing
To be that reset circuit increases an accessory power supply per input all the way, multichannel input need to increase multiple accessory power supplys, cost compared with
It is high.
Method 3 increases in power output end and switchs
As shown in Fig. 2, the structure chart of the reset circuit to increase switch using output.Increase by one in power output end to open
It closes, when resetting, power supply is not stopped, and is simply turned off the switch of power output end, can provide longer delay time in this way,
It realizes chip reset, but increases a switch on power output line, power-efficient can be caused to decline, and switch is resetting
After need delay startup, control is complicated, reduces the reliability of power supply.
Invention content
The technical problem to be solved in the present invention is to provide a kind of switching circuit it is long when reset circuit and it is long when repositioning method,
To solve the problems, such as existing Switching Power Supply it is long when reset circuit it is of high cost and power-efficient is low.
In order to solve the above-mentioned technical problem, the present invention solves by the following technical programs：
The present invention provides a kind of Switching Power Supply it is long when reset circuit, reset circuit includes when described long：It is sequentially connected with
Accumulator, the first actuating circuit, the second actuating circuit, the power output end for controlling chip and Switching Power Supply, and it is described
Second actuating circuit is also connected with the power output end；First actuating circuit, within resetting time, control described the
Two actuating circuits send voltage control instructions to the control chip；The control chip, for according to the second action electricity
The voltage control instructions that road is sent, the output voltage values for controlling the power output end are less than preset voltage value；The power supply is defeated
The load of the Switching Power Supply is stopped when the voltage of outlet is below the preset voltage value；The accumulator, is used for
Within the resetting time, power for first actuating circuit；The power output end was used within the resetting time,
It powers for second actuating circuit.
Further, reset circuit includes multichannel input when described long；Reset circuit includes when described long：One energy storage electricity
Road, identical multiple first actuating circuits of quantity, the second actuating circuit, control chip and power output end；Per road, input includes：
First actuating circuit, the second actuating circuit, control chip and power output end connected in sequence, and in the input, institute
It states the second actuating circuit and is also connected with the power output end；First actuating circuit of the accumulator connection per road in input.
Further, reset circuit further includes when described long：Decision circuitry；The decision circuitry connects the accumulator
And first actuating circuit per road in input；The decision circuitry, for when the resetting time starts to described
The first actuating circuit per road in input, which is sent, starts action command, at the end of the resetting time into every road input
The first actuating circuit send stop action command；The accumulator is additionally operable within the resetting time be the judgement
Circuit is powered.
Further, first actuating circuit, in the beginning action command for receiving the decision circuitry transmission
Later, second actuating circuit is triggered, and after receiving the stopping action command that the decision circuitry is sent, stops touching
Send out the second actuating circuit described；Second actuating circuit is used under the triggering of first actuating circuit, to the control
Chip sends voltage control instructions；The control chip, in the voltage control for receiving the second actuating circuit transmission
After instruction, the output voltage values for controlling the power output end are less than preset voltage value.
Further, reset circuit further includes when described long：Connect the delay circuit of the decision circuitry；The judgement electricity
Road, for after receiving reset signal, the first actuating circuit in being inputted to every road to send beginning action command and controls
The delay circuit starts timing, when receiving the timing end signal that the delay circuit is sent, in being inputted to every road
First actuating circuit, which is sent, stops action command；The delay circuit, for starting timing under the control of the decision circuitry,
And timing end signal, a length of reset of when timing of the delay circuit are sent to the decision circuitry at the end of timing
The length of time.
Further, reset circuit further includes when described long：Connect the receiving circuit of the decision circuitry；The reception electricity
Road is handled the reset signal received for receiving reset signal, and the reset signal is sent to by treated
The decision circuitry.
Further, reset circuit further includes when described long：Connect the reference circuit of the decision circuitry；The benchmark electricity
Road, for providing reference level for the decision circuitry.
Further, the control chip, the voltage control instructions for being sent according to second actuating circuit, control
The output voltage values of the power output end are more than zero and are less than preset voltage value.
The present invention also provides a kind of Switching Power Supply it is long when repositioning method, when long in reset circuit be arranged energy storage electricity
Road, the first actuating circuit, the second actuating circuit, the power output end for controlling chip and Switching Power Supply；It is described within resetting time
First actuating circuit controls second actuating circuit and sends voltage control instructions to the control chip；The first action electricity
Road controls second actuating circuit and sends voltage control instructions to the control chip within resetting time；The control core
The voltage control instructions that piece is sent according to second actuating circuit, the output voltage values for controlling the power output end are less than in advance
If voltage value；The load of the Switching Power Supply stops work when the voltage of the power output end is below the preset voltage value
Make；The accumulator is powered within the resetting time for first actuating circuit；The power output end is described multiple
In the time of position, power for second actuating circuit.
Further, multichannel is arranged in reset circuit when described long to input；Reset circuit includes when described long：One storage
It can circuit, identical multiple first actuating circuits of quantity, the second actuating circuit, control chip and power output end；It is inputted per road
Including：First actuating circuit, the second actuating circuit, control chip and power output end connected in sequence, and in the input
In, second actuating circuit is also connected with the power output end；First action of the accumulator connection per road in input
Circuit.
The present invention has the beneficial effect that：
Actuating circuit in reset circuit is increased to two by the present invention, controls the output voltage of chip controls power output end
Value is reduced to preset voltage value hereinafter, the output voltage of Switching Power Supply is made to be insufficient to allow the loaded work piece of Switching Power Supply, Jin Erke
With complete Switching Power Supply said system reset simultaneously, using accumulator be relatively small first actuating circuit of power consumption
Power supply, power output end are the relatively large second actuating circuit power supply of power consumption.In this way, the present invention is without using independent auxiliary
Power supply is helped, need not also increase in power output end and switch, circuit structure is simple, realizes that difficulty is low, and improves power supply effect
Rate and reliability, reduce circuit cost.
Description of the drawings
Fig. 1 is the structure chart for the reset circuit for using independent power supply in the prior art；
Fig. 2 is the structure chart for the reset circuit for increasing switch using output in the prior art；
Fig. 3 be Switching Power Supply according to a first embodiment of the present invention it is long when reset circuit structure chart；
Fig. 4 be Switching Power Supply according to a second embodiment of the present invention it is long when reset circuit concrete structure diagram；
Fig. 5 be Switching Power Supply according to a third embodiment of the present invention it is long when reset circuit circuit structure diagram；
Fig. 6 be multi-input switch power supply according to a fourth embodiment of the present invention it is long when reset circuit structure chart；
Fig. 7 be multi-input switch power supply according to a fourth embodiment of the present invention it is long when reset circuit concrete structure diagram；
Fig. 8 be multi-input switch power supply according to a fifth embodiment of the present invention it is long when reset circuit circuit structure diagram；
Fig. 9 be Switching Power Supply according to a sixth embodiment of the present invention it is long when repositioning method flow chart.
Specific implementation mode
Below in conjunction with attached drawing and embodiment, the present invention will be described in further detail.It should be appreciated that described herein
Specific embodiment be only used to explain the present invention, limit the present invention.
Embodiment one
The present embodiment provides a kind of Switching Power Supply it is long when reset circuit.The Switching Power Supply can be isolated power supply.This is opened
Powered-down source it is long when reset circuit can be used for resetting the system belonging to the Switching Power Supply.
Fig. 3 be according to the Switching Power Supply of first embodiment of the invention it is long when reset circuit structure chart.
In the present embodiment, reset circuit includes when long：It is accumulator connected in sequence, the first actuating circuit, second dynamic
The power output end made circuit, control chip and Switching Power Supply；Wherein, the second actuating circuit be also connected with Switching Power Supply power supply it is defeated
Outlet.
First actuating circuit is sent within resetting time, controlling second actuating circuit to the control chip
Voltage control instructions.
Chip is controlled, the voltage control instructions for being sent according to second actuating circuit control the power supply output
The output voltage values at end are less than preset voltage value.Further, chip is controlled, for what is sent according to second actuating circuit
Voltage control instructions, the output voltage values for controlling the power output end are more than zero and are less than preset voltage value.The power supply is defeated
The load of the Switching Power Supply is stopped when the voltage of outlet is below the preset voltage value, i.e. Switching Power Supply said system
It is stopped below the preset voltage value.Chip in the load of Switching Power Supply e.g. Switching Power Supply said system.
Power output end, within resetting time, powering for second actuating circuit.
Accumulator, within resetting time, powering for first actuating circuit.
In other words, when Switching Power Supply said system is resetted, when being resetted such as the chip in the system, first
Actuating circuit obtains electric energy from accumulator, and the second actuating circuit obtains electric energy from power output end.
In the present embodiment, actuating circuit in reset circuit is increased to two, control chip controls power output end
Output voltage values are reduced to preset voltage value hereinafter, the output voltage of Switching Power Supply is made to be insufficient to allow the load work of Switching Power Supply
Make, so can the reset for completing Switching Power Supply said system simultaneously, the use of accumulator is power consumption relatively small the
One actuating circuit is powered, and power output end is the relatively large second actuating circuit power supply of power consumption.In this way, the present embodiment is not necessarily to
Using independent accessory power supply, it need not also increase in power output end and switch, circuit structure is simple, realizes that difficulty is low, and
Power-efficient and reliability are improved, circuit cost is reduced.
Embodiment two
Fig. 4 be Switching Power Supply according to a second embodiment of the present invention it is long when reset circuit concrete structure diagram.
In the present embodiment, reset circuit includes when long：Receiving circuit, decision circuitry, the first actuating circuit, the second action
Circuit, control chip, power output end, accumulator, delay circuit and reference circuit.
Wherein, receiving circuit, decision circuitry, the first actuating circuit, the second actuating circuit, control chip, power output end
It is sequentially connected with；Second actuating circuit is also connected with power output end；Accumulator is separately connected decision circuitry and the first actuating circuit；
Delay circuit and reference circuit all connection judgment circuits.
Receiving circuit is handled for docking receipts reset signal, and reset signal is sent to judgement electricity by treated
Road.Further, receiving circuit includes：Level shifting circuit, logic varying circuit and signal holding circuit.Level shifting circuit
For carrying out voltage conversion to reset signal.Logic varying circuit is used to carry out logic variation to reset signal, makes reset signal
Variation is high level signal or low level signal.Signal holding circuit is for maintaining reset signal predetermined hold-time section.
Decision circuitry, for after receiving reset signal (by receiving circuit treated reset signal), to the
One actuating circuit, which sends beginning action command and controls delay circuit, starts timing, in the timing knot for receiving delay circuit transmission
When beam signal, is sent to the first actuating circuit and stop action command.Further, decision circuitry is receiving receiving circuit transmission
Signal after, can judge whether the signal is reset signal according to the level of signal height.
Delay circuit is timing circuit, for starting timing under the control of decision circuitry, and to sentencing at the end of timing
Deenergizing sends timing end signal.The length of a length of resetting time when the timing of delay circuit.In decision circuitry and delay electricity
Under the cooperation on road, decision circuitry transmission beginning action command to the time sent between stopping action command is resetting time, this
The first actuating circuit of sample can control second actuating circuit and refer to control chip transmission voltage control within resetting time
It enables.
Reference circuit, for providing reference level for the decision circuitry.Further, reference circuit can pass through judgement
Circuit provides reference level for delay circuit.
First actuating circuit, for after the beginning action command for receiving decision circuitry transmission, triggering second to act
Circuit, and after the stopping action command for receiving decision circuitry transmission, stop the second actuating circuit of triggering.First action electricity
Road receive start action command after the first actuating circuit start to act, signal is transmitted to the second actuating circuit, to make the
Two actuating circuits also begin to act.
Second actuating circuit, under the triggering of the first actuating circuit, voltage control instructions to be sent to control chip.The
Two actuating circuits start to send voltage control instructions to the control chip positioned at primary side after acting.
Chip is controlled, for after the voltage control instructions for receiving the transmission of the second actuating circuit, control power supply to export
The output voltage values at end are less than preset voltage value.The preset voltage value can be 2V.Further, control chip is receiving the
After the voltage control instructions that two actuating circuits are sent, the output voltage values that can control power output end are more than zero and less than default
Voltage value.
Such as：The voltage value for controlling chip controls power output end is more than 0.7V and is less than 2V, and such Switching Power Supply remains unchanged
There is output voltage, but be greater than 0.7V and be insufficient to allow system worked well less than the output voltage of 2V, to make system reset.
Power output end is exported for power, while being powered for the second actuating circuit within resetting time.
Accumulator, within resetting time, being that decision circuitry and the first actuating circuit are powered.In the present embodiment,
Because decision circuitry and the electric energy of the first actuating circuit consumption are all less, smaller energy storage electricity is used in accumulator
Hold, so that it may to maintain the power supply of long period.
In the present embodiment, it is decision circuitry and the by accumulator when being resetted to Switching Power Supply said system
One actuating circuit is powered, and is powered for the second actuating circuit by power output end, circuit structure is more succinct in circuit design, nothing
Independent accessory power supply need to be used, need not more increase in power output end and switch, circuit complexity is low, it is small to realize difficulty and
At low cost, power-efficient and reliability are high.
Further, within resetting time, accumulator is that decision circuitry and the first actuating circuit are powered, because judging electricity
Road and the first actuating circuit power consumption are less, so accumulator small volume.
Embodiment three
Be given below Switching Power Supply it is long when reset circuit circuit structure specific example, but art technology
Personnel are it is appreciated that the various the circuit diagram of the present embodiment only to illustrate the invention rather than limits of the invention.Fig. 5 is according to this
The Switching Power Supply of invention 3rd embodiment it is long when reset circuit circuit structure diagram.
In the present embodiment, receiving circuit includes：Resistance R1, capacitance C1, metal-oxide-semiconductor Q1, resistance R2, diode D1, capacitance
C2 and resistance R3.
One end of one end and capacitance C1 of gate pole (grid) the connection resistance R1 of metal-oxide-semiconductor Q1.
The anode of one end and diode D1 of the drain electrode connection resistance R2 of metal-oxide-semiconductor Q1.The other end and resistance R2 of resistance R1
Other end connection reference circuit, accumulator and power output end.
The other end, one end of capacitance C2, one end of resistance R3 and the earth point of the source electrode connection capacitance C1 of metal-oxide-semiconductor Q1.Electricity
Hold the other end, the other end of resistance R3 and the cathode connection judgment circuit (gate pole of metal-oxide-semiconductor Q2) of diode D1 of C2.Resistance
The tie point of R1, capacitance C1 and metal-oxide-semiconductor Q1 (gate pole) are as reset signal input point.The reset that Switching Power Supply said system is sent out
Reset circuit when signal (Reset signal) will enter long by reset signal input point.
Resistance R1, capacitance C1, resistance R2 and metal-oxide-semiconductor Q1 can complete level conversion and the logic variation of reset signal.Its
In, resistance R1 and resistance R2 can more than connect different potentials, complete level conversion.Resistance R1, resistance R2 and metal-oxide-semiconductor Q1 can be completed
Logical transition.Capacitance C1 is for postponing and filtering.
Diode D1, capacitance C2 and resistance R3 form signal holding circuit.If the reset signal of input is very short, the signal
The reset signal of input can be maintained certain time by holding circuit, accomplish to reset letter to ensure that decision circuitry can fully be caught
Number.
In the present embodiment, decision circuitry includes：Metal-oxide-semiconductor Q2, resistance R4, comparator X1, resistance R10 and capacitance C7.
The gate pole of metal-oxide-semiconductor Q2 connects receiving circuit.Further, two poles in the gate pole connection receiving circuit of metal-oxide-semiconductor Q2
The cathode of pipe D1.
The negative input end and delay circuit of the drain electrode connection comparator X1 of metal-oxide-semiconductor Q2.
One end of the source electrode connection resistance R4 of metal-oxide-semiconductor Q2.
The positive input terminal of comparator X1 connects reference circuit.One end of the output end connection resistance R10 of comparator X1, capacitance
One end of C7 and the first actuating circuit.
The other end connection accumulator (cathode of diode D3) of resistance R10.
The other end of resistance R4 connects earth point with the other end of capacitance C7.
The core of decision circuitry is comparator X1, and the positive input terminal of comparator X1 connects reference circuit, and negative input end passes through
Component connects receiving circuit and delay circuit, and output end connects the first actuating circuit and connects energy storage electricity by component
Road.
It, can be by metal-oxide-semiconductor Q2 by the negative of comparator X1 after decision circuitry receives the reset signal from receiving circuit
The level of input terminal is set low, and such delay circuit starts timing and comparator X1 will generate state change, and comparator X1's is defeated
Outlet level sets height, and then actuating signal (starting action command) is passed to the first actuating circuit, and delay circuit timing terminates,
The level of the good fortune input terminal of comparator X1 sets height, and the output end level of comparator X1 state changes, comparator X1 is set low, and then will
Stop actuating signal (stopping action command) and passes to the first actuating circuit, the first actuating circuit stopping action.Further, exist
In the case of not resetted, the negative input end voltage of comparator X1 is close to the output voltage of power supply, and positive input terminal voltage is
The partial pressure of the output voltage of power supply is less than the voltage of negative input end, therefore when comparator X1 output is low level, the first action electricity
It is failure to actuate on road.
In the present embodiment, delay circuit includes：Capacitance C3, capacitance C4, resistance R8 and resistance R9.
One end of capacitance C3 and one end connection judgment circuit (negative input end of comparator X) of capacitance C4 and concatenated electricity
Hinder one end of R8 and resistance R9.
Concatenated resistance R8 connects accumulator (cathode of diode D2) with the other end of resistance R9.
The other end of capacitance C3 connects earth point with the other end of capacitance C4.Delay circuit can influence the negative of comparator X1
The voltage of input terminal, when not resetted, delay circuit is stable state, the output of the voltage of capacitance C3 and capacitance C4 close to power supply
Voltage and do not change, after reset signal arrives, is set the voltage of the capacitance C3 of delay circuit and capacitance C4 by metal-oxide-semiconductor Q2
Low, after reset signal disappearance, delay circuit starts timing, is charged to capacitance C3 and capacitance C4 by resistance R8 and resistance R9,
Capacitance C3 and the voltage of capacitance C4 is set slowly to increase, when the voltage of capacitance C3 and capacitance C4 rise to reference voltage, delay electricity
Timing is terminated on road, and comparator X1 terminates homing action, and reset terminates, and the output end of comparator X1 exports low level, makes first to move
Make circuit stopping action.
In the present embodiment, reference circuit includes：Resistance R5, resistance R6, capacitance C5, capacitance C6 and resistance R7.
One end connection receiving circuit (other end of the other end and resistance R2 of resistance R1), accumulator and the electricity of resistance R5
Source output terminal.
One end of one end and capacitance C5 of the other end connection resistance R6 of resistance R5.
(comparator X1's is just defeated for one end of other end connection capacitance C6, one end of resistance R7 and the decision circuitry of resistance R6
Enter end).
The other end of capacitance C5, the other end of capacitance C6 connect earth point with the other end of resistance R7.
In benchmark stable state, level that reference circuit is kept fixed.Since the action of reference circuit changes slower, base
Quasi- circuit can provide a level reference for comparator X1.The action of reference circuit need it is slower than delay circuit, this
For sample in power initiation, comparator X1 just can be there are one correct state.
In the present embodiment, the first actuating circuit includes：Resistance R12, resistance R13 and metal-oxide-semiconductor Q3.
One end connection judgment circuit (output end of comparator X1) of resistance R12.
One end of the source electrode connection resistance R13 of metal-oxide-semiconductor Q3 and earth point.
The other end of the other end and resistance R13 of the gate pole connection resistance R12 of metal-oxide-semiconductor Q3.
The drain electrode of metal-oxide-semiconductor Q3 connects the second actuating circuit.
The core of first actuating circuit is metal-oxide-semiconductor Q3.When not resetted, metal-oxide-semiconductor Q3 is closed, and the second actuating circuit is not
It can action；When being resetted, metal-oxide-semiconductor Q3 is open-minded, the action of the first actuating circuit.When first actuating circuit acts, MOS is only maintained
The gate voltage of pipe Q3, to which the electric energy of the first actuating circuit consumption is few.
Resistance R13 is discharge resistance, can prevent metal-oxide-semiconductor Q3 from opening by mistake logical, and resistance R13 can take bigger resistance value,
To reduce energy consumption.
In the present embodiment, the second actuating circuit includes：Resistance R14 and optocoupler U1.
One end of the anode connection resistance R14 of optocoupler U1.The other end of R14 connects power output end.
The cathode of optocoupler U1 connects the first actuating circuit (drain electrode of metal-oxide-semiconductor Q3).
The COMP pins of the collector connection control chip of optocoupler U1.
The ground pin of the emitter connection control chip of optocoupler U1.
When the first actuating circuit starts action, the access of optocoupler U1 is opened, and optocoupler U1 starts to act, and optocoupler U1 is defeated
The collector of outlet is set low, the COMP pins of the collector connection control chip of optocoupler U1 output ends, when the level of COMP pins
After being pulled low, the voltage of power output end can reduce.If the voltage of power output end is reduced to 0, optocoupler U1 cannot be exported
The output of electric energy, optocoupler U1 also will be out of hand, therefore control chip can rework, and therefore, COMP pins are stablizing shape
Voltage will not be 0 when state, may be at a lower voltage value, and at this moment the voltage of power output end maintains 2V hereinafter, just
The output of optocoupler U1 can be just connected, but be connected and be not enough.
In the present embodiment, control chip is the control chip U2 in figure.
The model UC3842 of chip U2 is controlled, the control chip of other models is also possible.
If the control chip used does not have COMP pins, can control the enabled foot of the control chip, delay startup foot or
Person controls the power supply of the control chip.
Power output end：Without specific device in figure.Power output end can be interpreted as to power supply (Power
Supply the positive negative wire of power supply output (Output)).Power supply right end is power input (Input) in the figure, and power supply left end is
Power supply exports.
In the present embodiment, accumulator includes：Diode D2, resistance R11, diode D3 and capacitance C8.
(resistance R1's is another for anode connection power supply, reference circuit (one end of resistance R5) and the receiving circuit of diode D2
The other end at end and resistance R2).
One end of the cathode connection resistance R11 of diode D2, the cathode of diode D3, (resistance R10's is another for decision circuitry
End, the power positive end of comparator X1), delay circuit (other end of concatenated resistance R8 and resistance R9).
One end of the other end of resistance R11 and the anode connection capacitance C8 of diode D3.The other end of capacitance C8 connects
Place.
The core of accumulator is capacitance C8, and when not resetted, power output end passes through diode D2 and resistance R11
It charges to capacitance C8, when power reset does not export, capacitance C8 is supplied by diode D3 to comparator X1 and metal-oxide-semiconductor Q3 gate poles
Electricity.Because comparator X1 and metal-oxide-semiconductor Q3 gate poles consumption electric energy it is seldom, and comparator X1 and metal-oxide-semiconductor Q3 can work to than
Lower voltage, therefore smaller capacitance can maintain the long time.In accumulator, the effect of diode D2
It is to prevent the electric energy of capacitance C8 from flowing to elsewhere during power reset.
In the present embodiment, it by the way that the second actuating circuit to be connected to the different pins of control chip, when being resetted, draws
The power supply of the COMP pins of low control chip, enabled the foot either level of delay startup foot or cut-out control chip, makes control core
Piece makes control chip export smaller duty ratio or be stopped with lower COMP pin voltages, and then reduces power supply output
Output voltage, electric current and the power at end.In this way, although the output voltage of power output end is not zero, because power supply exports
The output voltage at end is smaller, Switching Power Supply said system can be made to be resetted completely.
In the present embodiment, the preset voltage value or less that is supported on of Switching Power Supply is stopped.Such as：Power output end
It is uncomfortable if it can be operated in 1V so using the system of Switching Power Supply between output voltage can be adjusted 0.7V to 2V
For the present embodiment.
In the present embodiment, under lower output voltage, the second actuating circuit can still be obtained from power output end
Electric energy is thus greatly reduced requirement of the reset circuit to accumulator.The closing if control chip is enabled, power supply are defeated
The output voltage of outlet would fall to 0V, and the second actuating circuit will stop sending voltage control instructions to the control chip of primary side,
At this moment control chip, which will reset, restarts, and the output voltage of power output end will increase, but when the output of power output end
Before voltage reaches 2V (preset voltage value), since the second actuating circuit positioned at secondary side is powered again by power output end, institute
Can voltage control instructions be sent to control chip immediately with the second actuating circuit, to be again switched off control chip, power supply output
The output voltage at end is maintained under 2V, does not exceed 2V, and in the process, the output voltage of power output end is unstable
, fluctuation, and such case can be maintained to until delay circuit timing terminates, and decision circuitry receives delay circuit
Timing end signal will send to the first actuating circuit and stop action command, and the first actuating circuit is stopped, the second action electricity
Road will also be stopped, and control chip reset is restarted, this is that primary reset is completed.
It is 12V that application conditions, which can be power supply output, in the present embodiment, and resetting time requirement is at least 1 second.Each member
The value of device：Resistance R1：6.8k；Capacitance C1：100n；Resistance R2：10k；Capacitance C2：220n；Resistance R3：510k；Resistance R4：
5.11；Resistance R5：180k；Capacitance C5：10u；Resistance R6：180k；Capacitance C6：10u；Resistance R7：510k；Capacitance C3：4.7u；Electricity
Hold C4：4.7u；Resistance R8：270k；Resistance R9：180k；Resistance R10：5.6k；Capacitance C7：1u；Resistance R11：5.6k；Capacitance C8：
220u；Resistance R12：10；Resistance R13：1M；Resistance R14：1k.Wherein, the unit of resistance is ohm, and the unit of capacitance is farad.
The present invention it is long when reset circuit be suitable for inputting all the way, the Switching Power Supply that exports all the way, it is defeated to be also applied for multichannel
The Switching Power Supply enter, exported all the way.The case where inputting all the way can be with the description of reference implementation example three.What is inputted applied to multichannel
When Switching Power Supply, only the first actuating circuit and the second actuating circuit need that corresponding multichannel is arranged, other circuits, such as receive electricity
Road, decision circuitry, delay circuit, reference circuit and accumulator all only need one.
Example IV
The present embodiment provides a kind of multi-input switch power supply it is long when reset circuit.The multi-input switch circuit can be more
Road inputs anti-power supply source, and multichannel inputs the standby electric power supply of battery.
Fig. 6 be multi-input switch power supply according to a fourth embodiment of the present invention it is long when reset circuit structure chart.
Reset circuit includes multichannel input when long；The corresponding Switching Power Supply of every road input of reset circuit is defeated all the way when this is long
Enter.
Reset circuit includes when long：Identical multiple first actuating circuits of one accumulator, quantity, the second action electricity
Road, control chip and power output end.
Per road, input includes：First actuating circuit, the second actuating circuit, control chip and power supply output connected in sequence
End, and in the input, second actuating circuit is also connected with the power output end；
First actuating circuit of the accumulator connection per road in input.
As shown in fig. 7, for according to the multi-input switch power supply of fourth embodiment of the invention it is long when reset circuit it is specific
Structure chart.
Reset circuit further includes when long：Decision circuitry；The decision circuitry connects the accumulator and every road
The first actuating circuit in input.
The decision circuitry, for the first actuating circuit hair when the resetting time starts to described per road in input
Beginning action command is sent, stopping action being sent to first actuating circuit per road in input at the end of the resetting time
Instruction.
The accumulator is additionally operable within the resetting time be the decision circuitry power supply.
Further, reset circuit further includes when long：Connect the delay circuit of the decision circuitry.
The decision circuitry, for after receiving reset signal, the first actuating circuit in being inputted to every road to be sent
Start action command and control the delay circuit and start timing, in the timing end signal for receiving the delay circuit and sending
When, the first actuating circuit in being inputted to every road, which is sent, stops action command.
The delay circuit, for starting timing under the control of the decision circuitry, and to described at the end of timing
Decision circuitry sends timing end signal, the length of when timing of the delay circuit a length of resetting time.
Further, reset circuit further includes when long：Connect the receiving circuit of the decision circuitry.
The receiving circuit is handled the reset signal received for receiving reset signal, and by treated
The reset signal is sent to the decision circuitry.
Further, reset circuit further includes when long：Connect the reference circuit of the decision circuitry.The reference circuit,
For providing reference level for the decision circuitry.
In the present embodiment, when being resetted to Switching Power Supply said system, by accumulator for decision circuitry and often
The first actuating circuit power supply in road is the second actuating circuit power supply in every road by the power output end in every road, in circuit
Circuit structure is more succinct in design, electric without independent auxiliary is used it is not necessary that accumulator is separately provided for the input of every road
Source need not more increase in power output end and switch, reduce circuit complexity, realizes difficulty and cost, improve power supply
Efficiency and reliability.
Embodiment five
Be given below multi-input switch power supply it is long when reset circuit circuit structure specific example.But this field
Technical staff is it is appreciated that the various the circuit diagram of the present embodiment only to illustrate the invention rather than limits of the invention.Fig. 8 is root
According to fifth embodiment of the invention multi-input switch power supply it is long when reset circuit circuit structure diagram.
In order to make it easy to understand, in the present embodiment, Switching Power Supply is two-way input switch power supply, then reset circuit when long
For comprising two-way input it is long when reset circuit, and the corresponding power supply of input per road.
During the receiving circuit, delay circuit, reference circuit, accumulator, decision circuitry, the first via of the present embodiment input
First actuating circuit, the second actuating circuit, control chip and the first power supply the circuit structure of power output end be referred to reality
Apply description of the example three to the Switching Power Supply inputted all the way.
Second tunnel input in the first actuating circuit include：Resistance R15, resistance R16 and metal-oxide-semiconductor Q4.
One end connection judgment circuit (output end of comparator X1) of resistance R15.
One end of the source electrode connection resistance R16 of metal-oxide-semiconductor Q4 and earth point.
The other end of the other end and resistance R16 of the gate pole connection resistance R15 of metal-oxide-semiconductor Q4.
The second actuating circuit in drain electrode connection the second tunnel input of metal-oxide-semiconductor Q4.
Second tunnel input in the second actuating circuit include：Resistance R17 and optocoupler U3.
One end of the anode connection resistance R17 of optocoupler U3.The other end of R17 connects the second source in the input of the second tunnel
Power output end.
The cathode of optocoupler U3 connects the first actuating circuit (drain electrode of metal-oxide-semiconductor Q4).
The COMP pins of the collector connection control chip U4 of optocoupler U3.
The ground pin of the emitter connection control chip U4 of optocoupler U3.
The output end of the first power supply in first via input and the output end of the second source in the input of the second tunnel pass through two
Pole pipe connects.Further, diode D4 is set in the output end of the first power supply, the anode connection output of diode D4 is rectified
Pole.In the output end of second source, diode D5, the anode connection output head anode of diode D5 are set；The cathode of diode D4
Connect the anode of diode D2 and the cathode of diode D5.
Embodiment six
The present embodiment provides a kind of Switching Power Supply it is long when repositioning method.Fig. 9 is opening according to a sixth embodiment of the present invention
Powered-down source it is long when repositioning method flow chart.
Accumulator, the first actuating circuit, the second actuating circuit, control is arranged in step S910 when long in reset circuit
The power output end of chip and Switching Power Supply.
Accumulator, the first actuating circuit, the second actuating circuit, control chip and Switching Power Supply power output end sequentially
Connection, and second actuating circuit is also connected with the power output end.
Step S920, within resetting time, first actuating circuit controls second actuating circuit to the control
Chip sends voltage control instructions.
Since resetting time be resetting to the period for resetting end.
Step S930, first actuating circuit control second actuating circuit to the control within resetting time
Chip sends voltage control instructions.
Step S940, the voltage control instructions that the control chip is sent according to second actuating circuit, described in control
The output voltage values of power output end are less than preset voltage value.
When the voltage of power output end is below preset voltage value, the load of Switching Power Supply is stopped.
Step S950, the accumulator are powered within the resetting time for first actuating circuit.
Step S960, the power output end are powered within the resetting time for second actuating circuit.
Further, input all the way or multichannel input are set when long in reset circuit.
It is arranged in reset circuit when long when inputting all the way, reset circuit includes when described long：One accumulator, quantity
Identical multiple first actuating circuits, the second actuating circuit, control chip and power output end.
Per road, input includes：First actuating circuit, the second actuating circuit, control chip and power supply output connected in sequence
End, and in the input, second actuating circuit is also connected with the power output end；
First actuating circuit of the accumulator connection per road in input.
Further include the judgement for connecting accumulator and the first actuating circuit per road in input in reset circuit when long
Circuit, the delay circuit for being separately connected the decision circuitry, reference circuit and receiving circuit.
Within resetting time, the accumulator is decision circuitry and the first actuating circuit power supply per road in input；
Power output end per road in input is the second actuating circuit power supply in the input of the road.
Although being example purpose, the preferred embodiment of the present invention is had been disclosed for, those skilled in the art will recognize
Various improvement, increase and substitution are also possible, and therefore, the scope of the present invention should be not limited to the above embodiments.
Claims (10)
1. a kind of Switching Power Supply it is long when reset circuit, which is characterized in that reset circuit includes when described long：
The power supply output of accumulator, the first actuating circuit, the second actuating circuit, control chip and Switching Power Supply connected in sequence
End, and second actuating circuit is also connected with the power output end；
First actuating circuit is sent within resetting time, controlling second actuating circuit to the control chip
Voltage control instructions；
The control chip, the voltage control instructions for being sent according to second actuating circuit control the power supply output
The output voltage values at end are less than preset voltage value；It is opened described in when the voltage of the power output end is below the preset voltage value
The load in powered-down source is stopped；
The accumulator, within the resetting time, powering for first actuating circuit；
The power output end, within the resetting time, powering for second actuating circuit.
2. reset circuit when as described in claim 1 long, which is characterized in that
Reset circuit includes multichannel input when described long；
Reset circuit includes when described long：Identical multiple first actuating circuits of one accumulator, quantity, the second action electricity
Road, control chip and power output end；
Per road, input includes：First actuating circuit, the second actuating circuit, control chip and power output end connected in sequence, and
And in the input, second actuating circuit is also connected with the power output end；
First actuating circuit of the accumulator connection per road in input.
3. reset circuit when as claimed in claim 2 long, which is characterized in that
Reset circuit further includes when described long：Decision circuitry；The decision circuitry connects the accumulator and every road
The first actuating circuit in input；
The decision circuitry is opened for the first actuating circuit transmission when the resetting time starts to described per road in input
Beginning action command, the first actuating circuit transmission stopping action to described per road in input at the end of the resetting time refer to
It enables；
The accumulator is additionally operable within the resetting time be the decision circuitry power supply.
4. reset circuit when as claimed in claim 3 long, which is characterized in that
First actuating circuit, for after receiving the beginning action command that the decision circuitry is sent, described in triggering
Second actuating circuit, and after receiving the stopping action command that the decision circuitry is sent, it is dynamic to stop triggering described second
Make circuit；
Second actuating circuit, under the triggering of first actuating circuit, voltage control to be sent to the control chip
System instruction；
The control chip, for after receiving the voltage control instructions that second actuating circuit is sent, described in control
The output voltage values of power output end are less than preset voltage value.
5. reset circuit when as described in claim 3 or 4 long, which is characterized in that
Reset circuit further includes when described long：Connect the delay circuit of the decision circuitry；
The decision circuitry, for after receiving reset signal, the first actuating circuit transmission in being inputted to every road to start
Action command simultaneously controls the delay circuit and starts timing, when receiving the timing end signal that the delay circuit is sent,
The first actuating circuit in being inputted to every road, which is sent, stops action command；
The delay circuit, for starting timing under the control of the decision circuitry, and to the judgement at the end of timing
Circuit sends timing end signal, the length of when timing of the delay circuit a length of resetting time.
6. reset circuit when as described in claim 3 or 4 long, which is characterized in that
Reset circuit further includes when described long：Connect the receiving circuit of the decision circuitry；
The receiving circuit is handled the reset signal received for receiving reset signal, and will that treated is described
Reset signal is sent to the decision circuitry.
7. reset circuit when as described in claim 3 or 4 long, which is characterized in that
Reset circuit further includes when described long：Connect the reference circuit of the decision circuitry；
The reference circuit, for providing reference level for the decision circuitry.
8. reset circuit when long as described in any one of claim 1-4, which is characterized in that
The control chip, the voltage control instructions for being sent according to second actuating circuit control the power supply output
The output voltage values at end are more than zero and are less than preset voltage value.
9. a kind of Switching Power Supply it is long when repositioning method, which is characterized in that
Accumulator, the first actuating circuit, the second actuating circuit, control chip and Switching Power Supply are set when long in reset circuit
Power output end；
Within resetting time, first actuating circuit controls second actuating circuit and sends voltage control to the control chip
System instruction；
First actuating circuit controls second actuating circuit and sends voltage control to the control chip within resetting time
System instruction；
The voltage control instructions that the control chip is sent according to second actuating circuit, control the defeated of the power output end
Go out voltage value and is less than preset voltage value；The Switching Power Supply when voltage of the power output end is below the preset voltage value
Load be stopped；
The accumulator is powered within the resetting time for first actuating circuit；
The power output end is powered within the resetting time for second actuating circuit.
10. repositioning method when as claimed in claim 9 long, which is characterized in that
Multichannel is arranged in reset circuit when described long to input；
Reset circuit includes when described long：Identical multiple first actuating circuits of one accumulator, quantity, the second action electricity
Road, control chip and power output end；
Per road, input includes：First actuating circuit, the second actuating circuit, control chip and power output end connected in sequence, and
And in the input, second actuating circuit is also connected with the power output end；
First actuating circuit of the accumulator connection per road in input.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710272002.XA CN108736691B (en) | 2017-04-24 | 2017-04-24 | Long-term reset circuit and long-term reset method of switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710272002.XA CN108736691B (en) | 2017-04-24 | 2017-04-24 | Long-term reset circuit and long-term reset method of switching power supply |
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| CN108736691A true CN108736691A (en) | 2018-11-02 |
| CN108736691B CN108736691B (en) | 2023-03-14 |
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| CN201710272002.XA Active CN108736691B (en) | 2017-04-24 | 2017-04-24 | Long-term reset circuit and long-term reset method of switching power supply |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113328736A (en) * | 2021-04-28 | 2021-08-31 | 漳州立达信光电子科技有限公司 | Reset circuit and equipment with adjustable reset time |
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| US20040098632A1 (en) * | 2002-10-02 | 2004-05-20 | Tadayoshi Ueda | Amplifying circuit, speaker system, and mobile information terminal employing amplifying circuit |
| CN202651822U (en) * | 2012-05-11 | 2013-01-02 | 南京恒星自动化设备有限公司 | Power source apparatus capable of prolonging work time of reserve battery |
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| CN113328736A (en) * | 2021-04-28 | 2021-08-31 | 漳州立达信光电子科技有限公司 | Reset circuit and equipment with adjustable reset time |
| CN113328736B (en) * | 2021-04-28 | 2024-06-11 | 漳州立达信光电子科技有限公司 | Reset circuit and equipment with adjustable reset time |
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| CN108736691B (en) | 2023-03-14 |
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