CN106787664A - Soft starting circuit - Google Patents
Soft starting circuit Download PDFInfo
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- CN106787664A CN106787664A CN201611169972.9A CN201611169972A CN106787664A CN 106787664 A CN106787664 A CN 106787664A CN 201611169972 A CN201611169972 A CN 201611169972A CN 106787664 A CN106787664 A CN 106787664A
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- relay
- electrochemical capacitor
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- voltage
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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
- H02M1/36—Means for starting or stopping converters
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
-
- 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
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/34—Snubber circuits
- H02M1/348—Passive dissipative snubbers
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Protection Of Static Devices (AREA)
Abstract
Present invention is disclosed a kind of soft starting circuit, including relay element, rectifier, PTC thermistor, electrochemical capacitor and controller；Relay element includes soft relay and main road relay, soft relay one end connects AC power, the other end connects the input of rectifier, rectifier output plus terminal connection PTC thermistor one end, the PTC thermistor other end connects electrochemical capacitor anode, electrochemical capacitor negative terminal is connected with rectifier negative terminal, forms loop；Main road relay one end connects AC power, and the other end is connected with main circuit, and main circuit is connected to the positive and negative two ends of electrochemical capacitor；When the charging voltage of controller detection electrochemical capacitor reaches preset value, soft relay of control disconnects, main road relay closure.By the on off state of control relay, electrochemical capacitor is charged, it is to avoid the surge current of AC power input is excessive, the power component impact of power-supply system is damaged, cause short circuit, realize the security and reliability of circuit.
Description
Technical field
The present invention relates to the technical field of electron electric power application, a kind of soft starting circuit is especially related to.
Background technology
In field of power supplies, high-power charger, adapter, high-power charging/discharging apparatus, charging pile etc. need high-power
During charging, in booting moment, tens to hundreds of amperes of surge current can be produced.
Surge current is the peak inrush current that power-supply device is flowed into power on moment.Due to input filter capacitor
Rapid to charge, the initial voltage on capacitor is zero, and equivalent to short circuit, charging transient can form very big electric current, may lead
Cause blowout, power network tripping operation, the burning of contact of closing switch, rectifier bridge to damage, have a strong impact on the use longevity of electronic component
Life, can also cause serious harmonic wave to power network, pollute power network.
In application fields such as Switching Power Supply, large power supplies, its reliability service is extremely important in actual applications, wherein opening
Dynamic process has a significant impact for the safe operation of device with reliability.Traditional Starting mode, input power is by after rectification
Charged directly to electric capacity, charge circuit resistance very little, dash current is larger, and this can cause net side dash current excessive, and it is pacified
Row for the national games such as threatens at the bad situation.
The content of the invention
The main object of the present invention is a kind of with the simple soft starting circuit of high-power, circuit to provide.
In order to achieve the above object, the present invention proposes following technical scheme：
A kind of soft starting circuit, including relay element, rectifier, PTC thermistor, electrochemical capacitor and controller；Institute
Stating relay element includes soft relay and main road relay；Described soft relay one end connects AC power, the other end
The input of rectifier is connected, the output plus terminal of the rectifier connects described PTC thermistor one end, the PTC temperature-sensitives electricity
The resistance other end connects the electrochemical capacitor anode, and the electrochemical capacitor negative terminal is connected with the rectifier negative terminal, forms loop；Institute
Main road relay one end connection AC power is stated, the other end is connected with main circuit, and the main circuit is connected to the electrochemical capacitor
Positive and negative two ends；When AC power is input into be connected, the controller controls the soft relay closure；When controller inspection
When the charging voltage for surveying the electrochemical capacitor two ends reaches preset value, the soft relay is controlled to disconnect, the main road relay
Device is closed.
Further, the resistance and power of above-mentioned PTC thermistor power size adjustment according to needed for load.
Further, the preset value of above-mentioned charging voltage is more than or equal to the 60% of AC power input voltage.
Further, controller noted above includes single-chip microcomputer；The single-chip microcomputer is calculated by detecting AC power input voltage
Go out the charging voltage preset value of the electrochemical capacitor.
Further, the real-time voltage at electrochemical capacitor two ends described in above-mentioned monolithic machine testing, by the electrochemical capacitor two
The contrast of the real-time voltage and predeterminated voltage at end；And according to the result of contrast, judge the relay switch state.
Further, above-mentioned single-chip microcomputer AC power be input into connect when, soft relay described in the Single-chip Controlling
Closure；
When electrochemical capacitor described in the monolithic machine testing charges, the real-time voltage of two ends storage is less than the electrochemical capacitor
The preset voltage value at two ends, soft relay described in the Single-chip Controlling is persistently closed, and the main road relay is failure to actuate；
The real-time voltage stored when electrochemical capacitor described in the monolithic machine testing charges is more than or equal to the electrolysis
The preset voltage value at electric capacity two ends, soft relay described in the Single-chip Controlling disconnects, the main road relay closure.
Further, above-mentioned electrochemical capacitor uses the electrochemical capacitor of dc bus.
Further, including fuse, described fuse one end connects AC power, and the other end connects the relay unit
Part.
Further, above-mentioned main circuit includes inductance and rectifier bridge；Described main road relay one end connects AC power, separately
One end connects one end of the inductance, and the other end of the inductance connects the rectifier bridge input, the rectification bridge output end
The electrochemical capacitor two ends are connected, and the electrochemical capacitor is charged, electrochemical capacitor load to needed for provides electric energy.
Further, above-mentioned rectifier bridge includes rectifying tube and stable switch element；
The rectifying tube carries out rectification by the energy storage to the inductance, then is filtered by the electrochemical capacitor two ends
Ripple；
The voltage at the electrochemical capacitor two ends is stablized in the stable switch element control, and the electricity of stabilization is provided to required load
Energy.
A kind of soft starting circuit that the present invention is provided, has an advantageous effect in that, AC power input starts connects moment,
Controller controls soft relay to close, and by PTC thermistor current limliting, electrochemical capacitor is charged, and effectively avoids
Because the surge current of AC power input is excessive, and cause the power component of power-supply system to damage, cause electrochemical capacitor two ends electricity
Pressure short circuit, realizes the security and reliability of system, reduces pollution of the harmonic wave to power network.
Brief description of the drawings
Fig. 1 is the schematic diagram of the soft starting circuit of one embodiment of the invention；
Fig. 2 is the schematic diagram of the soft starting circuit of one embodiment of the invention；
Fig. 3 is the schematic diagram of the soft starting circuit of another embodiment of the present invention.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, it is not intended to limit the present invention.
Reference picture 1, a kind of soft starting circuit, including relay element 1, rectifier 2, PTC thermistor 3, electrochemical capacitor 5
And controller；Relay element 1 includes soft relay and main road relay；Soft relay one end connects AC power, separately
One end connects the input of rectifier 2, and output plus terminal connection PTC thermistor 3 one end of rectifier 2, PTC thermistor 3 is another
One end connects the anode of electrochemical capacitor 5, and the negative terminal of electrochemical capacitor 5 is connected with the negative terminal of rectifier 2, forms loop；Main road relay one end
Connection AC power, the other end is connected with main circuit, and main circuit is connected to the positive and negative two ends of electrochemical capacitor 5；When AC power input
During connection, controller controls soft relay to close, and now main road relay is failure to actuate, and is off；When controller inspection
When the charging voltage for surveying the two ends of electrochemical capacitor 5 reaches preset value, soft relay of control disconnects, main road relay closure.
The invention of soft starting circuit, in order in startup power supply, the moment that switches on power prevents the surge that AC power is input into
Electric current is excessive, and the impact of the power component of power-supply system is damaged, and causes the Switching Power Supply cannot normal work.Rectifier is to hand over
Circulation turns to the device of direct current, and alternating current is become into direct current, and smooth direct current is provided to load after being filtered through electrochemical capacitor
Pressure.
PTC thermistor of the present invention 3 refers to semistor, and its resistance value is with the temperature of itself
The rising of degree shows the increase of step evolution, and temperature is higher, and resistance value is bigger；In the present embodiment, if the two ends of electrochemical capacitor 5
Voltage short circuit, the temperature moment of PTC thermistor 3 rises, internal resistance increase, and electric current is reduced, when the temperature of PTC thermistor 3 rises to
During more than 120 DEG C, more than its resistance value is up to megaohm, now PTC thermistor 3 is equal to open circuit, effectively avoid due to
Voltage short circuit and cause the damage of other elements.After unshorting failure, be down at a temperature for the treatment of PTC thermistor 3 85 DEG C with
After lower, circuit recovers normal.The high reliability of soft starting circuit is realized, the input circuit of Switching Power Supply is protected.
This circuit using positive temperature coefficient PTC thermistor 3, instantaneous power is big, small volume, antisurge are strong and not rapid wear
Bad advantage.
Above-mentioned preset value refers to the voltage at the two ends of electrochemical capacitor 5 set in the input circuit of AC power
Value, the magnitude of voltage is that AC power input circuit connects moment, the predeterminated voltage reached needed for the voltage at the two ends of electrochemical capacitor 5
Value.
As Figure 2-3, in the present embodiment, also including fuse 7, the one end of fuse 7 connection AC power, the other end
Connection relay element 1.The other end connection input of rectifier 2 of relay element 1, connects, control when AC power is input into
Device controls soft relay to close, and now, main road relay is failure to actuate, and is off, and AC power is arrived by fuse
Soft relay arrives the input of rectifier 2 again, and rectification is carried out to alternating current by rectifier 2, and rectifier 2 is by the friendship passed through
Stream electricity is changed into the direct current of pulsation, and the direct current of rectification is realized by PTC thermistor 3 by PTC thermistor 3 to electric current
Current limliting, then charged to electrochemical capacitor 5；After the voltage at the two ends of electrochemical capacitor 5 reaches preset value, controller control soft after
Electrical equipment is disconnected, while main road relay is closed, now, AC power is flowed into by main road relay, and is filtered by electrochemical capacitor 5
Ripple, loads for needed for and provides smooth dc source, so as to realize the process of soft start.When the short circuit of the both end voltage of electrochemical capacitor 5
When, the temperature moment of PTC thermistor 3 rises, and internal resistance increase, electric current is reduced, and 120 DEG C are more than when the temperature of PTC thermistor 3 rises
When, its resistance value reaches megaohm, and now PTC thermistor 3 is equal to open circuit, effectively avoids and is caused due to voltage short circuit
The damage of other elements.
Soft start is charged, effectively by fuse 7, the rectification of rectifier 2, the current limliting of PTC thermistor 3 to electrochemical capacitor 5
Soft start is realized, the impact to the power component of power-supply system is reduced, the blowout of input, power network tripping operation, conjunction is prevented
Burning of contact of lock switch etc., the service life of influence equipment and electronic component.
In the present embodiment, the resistance and power of PTC thermistor 3 can according to load needed for the big ditty of power
It is whole.When the power needed for load is larger, using the PTC thermistor 3 of relatively small resistance, electric current becomes big, to electric capacity
Charging interval is short, shortens the charging interval for realizing soft start.
In the present embodiment, the preset value of the charging voltage of above-mentioned electric capacity 5 is more than or equal to AC supply voltage
60%.For example the preset value of the charging voltage of electric capacity 5 is equal to the 60% of AC supply voltage, and AC power uses 220V, works as friendship
When the voltage for flowing power supply is 220V, switch on power, preset value is that the 60% of AC supply voltage 220V, i.e. preset value are 132V,
When to 5 real time charging of electrochemical capacitor, the voltage of the two ends of electrochemical capacitor 5 storage in real time reachesWhen, controller control
Soft relay disconnects, while main road relay is closed.
By using the current limliting of PTC thermistor 3, the real-time voltage value of the two ends charge storage of electrochemical capacitor 5, Ke Yiyou are set
The prevention power switch moment of effect, because electric current is excessive, the surge current that moment produces is excessive, to the power component of power-supply system
Impact and damage, play a part of to protect component.
In the present embodiment, controller noted above includes single-chip microcomputer；Single-chip microcomputer obtains electricity by detecting the voltage of AC power
The charging voltage preset value at solution electric capacity two ends 5.The real-time voltage at the two ends of monolithic machine testing electrochemical capacitor 5, by 5 liang of electrochemical capacitor
The contrast of the real-time voltage and predeterminated voltage at end, and according to comparing result, judge relay switch state.Single-chip microcomputer is by detection
The voltage of AC power, for example, AC power uses 220V, when the voltage that single-chip microcomputer detects AC power is 220V, in advance
If value is the 60% of AC power both end voltage 220V, then single-chip microcomputer gets the default of the charging voltage at the two ends of electrochemical capacitor 5
It is worth and isSwitch on power, when to 5 real time charging of electrochemical capacitor, the two ends of monolithic machine testing electrochemical capacitor 5 it is real-time
Voltage, by the real-time voltage and preset voltage value that detect the two ends of electrochemical capacitor 5Contrast, according to contrast knot
Really, judge whether the on off state of relay 1 is correct.If the real-time voltage at the two ends of monolithic machine testing electrochemical capacitor 5 is less than default
Magnitude of voltageWhether soft relay is then judged in closure state, and whether main road relay is in the shape for disconnecting
State, if soft relay is in closure state, main road relay is off, then may determine that the switch shape of relay 1
State is correct, and error signal is sent if mistake.Similarly, if the real-time voltage at the two ends of monolithic machine testing electrochemical capacitor 5 is more than or waits
In preset voltage valueThen judge whether soft relay is off, whether main road relay is in closure
State, if soft relay is off, main road relay be in closure state, then may determine that opening for relay 1
Off status is correct, and error signal is sent if mistake.
In the present embodiment, when AC power is input into and connects, soft relay of Single-chip Controlling is closed single-chip microcomputer；Work as list
The preset voltage value of the real-time voltage less than the two ends of electrochemical capacitor 5 of two ends storage when piece machine testing electrochemical capacitor 5 charges, single-chip microcomputer
Soft relay of control is persistently closed, and electrochemical capacitor 5 is still reached to during less than preset voltage value after 5 to 10 seconds, and trouble light is indicated, main
Road relay is failure to actuate；When monolithic machine testing electrochemical capacitor 5 charges, the real-time voltage of two ends storage is more than or equal to electrolysis
The preset voltage value at the two ends of electric capacity 5, soft relay of Single-chip Controlling disconnects, main road relay closure.When Single-chip Controlling is soft
Play relay to disconnect, main road relay closure, the soft start of circuit is completed, high-power charger, adapter, high-power discharge and recharge
Equipment, charging pile etc. start normal work, and soft relay of disconnection can just be closed again until lower secondary source is reclosed.
The magnitude of voltage of AC power is gathered using single-chip microcomputer can get the preset value of charging voltage, by detecting electricity
The real-time voltage value of solution electric capacity 5 two ends storage is simultaneously contrasted with preset value, it can be determined that soft relay and main road in circuit after
Whether the switch of electrical equipment is correct, at the same time it can also pass through the on off state of Single-chip Controlling relay.
In the present embodiment, for example:The alternating current of the nominal 220V of China Power Grids voltage is in a steady stream；When single-chip microcomputer detects exchange
When the voltage of power supply is 220V, preset value is the 60% of AC supply voltage 220V, then single-chip microcomputer gets the two ends of electrochemical capacitor 5
Charging voltage preset value be 132V, switch on power, when to 5 real time charging of electrochemical capacitor, monolithic machine testing electrochemical capacitor 5
The real-time voltage at two ends, by the real-time voltage and preset voltage value that detect the two ends of electrochemical capacitor 5Contrast, when
The voltage of electrochemical capacitor storage in real time is not up toWhen, controller controls soft relay persistently to close, main road relay
Device is persistently failure to actuate, and now main flow relay is off, and is stored in real time until single-chip microcomputer detects the two ends of electrochemical capacitor 5
Voltage reachWhen, soft relay of Single-chip Controlling disconnects, main road relay closure, completes soft of circuit
Dynamic process.
In another embodiment, for example:The AC power of the nominal 120V of American electricity Grids voltage；When single-chip microcomputer detects exchange
When the voltage of power supply is 120V, preset value is the 60% of AC supply voltage 120V, then single-chip microcomputer gets the two ends of electrochemical capacitor 5
Charging voltage preset value be 72V, switch on power, when to 5 real time charging of electrochemical capacitor, monolithic machine testing electrochemical capacitor 5
The real-time voltage at two ends, by the real-time voltage and preset voltage value that detect the two ends of electrochemical capacitor 5Contrast, work as electricity
The voltage of solution electric capacity storage in real time is not up toWhen, controller controls soft relay persistently to close, main road relay
Persistently it is failure to actuate, now main flow relay is off, until single-chip microcomputer detects the storage in real time of the two ends of electrochemical capacitor 5
Voltage reachesWhen, soft relay of Single-chip Controlling disconnects, while main road relay is closed, completes soft of circuit
Dynamic process.
In another embodiment, for example:The AC power of the nominal 240V of UK Grid voltage；When single-chip microcomputer detects exchange
When the voltage of power supply is 240V, preset value is the 60% of AC supply voltage 240V, then single-chip microcomputer gets the two ends of electrochemical capacitor 5
Charging voltage preset value be 144V, switch on power, when to 5 real time charging of electrochemical capacitor, monolithic machine testing electrochemical capacitor 5
The real-time voltage at two ends, by the real-time voltage and preset voltage value that detect the two ends of electrochemical capacitor 5Contrast, when
The voltage of electrochemical capacitor storage in real time is not up toWhen, controller controls soft relay persistently to close, main road relay
Device is persistently failure to actuate, and now main flow relay is off, and is stored in real time until single-chip microcomputer detects the two ends of electrochemical capacitor 5
Voltage reachWhen, soft relay of Single-chip Controlling disconnects, while main road relay is closed, completes circuit
Soft Start-up Process.
The use of single-chip microcomputer, makes system architecture simple, easy to use, realizes modularization, and reliability is high, longevity of service,
Processing function is strong, and speed is fast, low-voltage, low-power consumption, and control function is strong, strong environmental adaptability.
In the present embodiment, the electrochemical capacitor 5 of above-mentioned soft starting circuit uses the electrochemical capacitor of dc bus, in this implementation
Using the electrochemical capacitor (BUS electric capacity) of dc bus come charging and discharging in example, can be in parallel using multiple electrochemical capacitors, it is negative
DC voltage needed for providing is provided.
As Figure 1-3, in the present embodiment, above-mentioned main circuit also includes inductance 6 and rectifier bridge 4；Main road relay one
End connection AC power, the other end connects one end of inductance 6, and the other end connection input of rectifier bridge 4 of inductance 6, rectifier bridge 4 is defeated
Go out end connection electrochemical capacitor 5 two ends, be filtered by the anode of electrochemical capacitor, the load to needed for of electrochemical capacitor 5 provides smooth
Direct current energy.Above-mentioned rectifier bridge 4 includes rectifying tube and stable switch element；Rectifying tube is carried out whole by the energy storage to inductance 6
Stream, is filtered by electrochemical capacitor 5, and voltage stabilizing is carried out to the two ends of electrochemical capacitor 5；Stable switch element controls 5 liang of electrochemical capacitor
The stabilization of terminal voltage, regulated power is provided to required load.Rectifying tube is whole in by carrying out energy storage, rectifier bridge 4 to inductance 6
Stream, electrochemical capacitor 5 are filtered and stable switch is to the stabilization of voltage, and galvanic current pressure is provided to load.
As Figure 1-3, in the present embodiment, in Switching Power Supply input circuit, soft relay includes S2, S3, main
Road relay includes S1, S4, ac power output connection fuse 7 one end, the other end of fuse 7 connection relay S1, S2,
S3, S4 one end, the other end of relay S2, S3 connect the input of rectifier 2, the output plus terminal connection PTC temperature-sensitives of rectifier 2
The one end of resistance 3, the other end of PTC thermistor 3 connects the electrochemical capacitor anode (BUS electric capacity) of dc bus, the electricity of dc bus
Solution electric capacity (BUS electric capacity) negative terminal connects the negative terminal of rectifier 2, forms loop.
Soft Start-up Process：When single-chip microcomputer detects AC power input voltage, ± the 10% of setting nominal input voltage,
For example：Set specified input ac voltage 220V ,+the 10% of nominal input voltage is 242V, nominal input voltage -10% just
When being 198V, therefore, in the range of nominal input voltage 198V-242V, soft relay adhesive, the rectification of rectified device 2,
The current limliting of PTC thermistor 3, the electrochemical capacitor 5 (BUS electric capacity) to dc bus charge, electrochemical capacitor (the BUS electricity of dc bus
Holding) initial voltage is zero, and AC supply voltage is slowly charged to by current limlitingWhen (exchange turns direct current computing formula：
198*60%*1.414=167V；242*60%*1.414=205V), Single-chip Controlling relay S2, S3 disconnect, while monolithic
Machine control relay S1, S4 is closed, it is achieved thereby that Soft Start-up Process.
As shown in figure 3, in the present embodiment, main circuit work includes, AC power connection fuse one end, another termination
Relay S1, S2, S3, S4 one end, other end connection inductance L1 one end of relay S1, the inductance L1 other ends connect the S ends of Q1
With the D ends of Q3；Other end connection inductance L2 one end of relay S4, the S ends of inductance L2 other ends connection Q2 and the D ends of Q4；Shape
Into interactive mode PFC (PFC) BOOST (booster circuit) circuit.In stabilization process of boosting, monolithic machine testing
Q3 PWM start working when being in positive half cycle to AC power, and inductance L1 energy storage when Q3 PWM are opened, Q1 utilizes internal body diodes
Unilateal conduction characteristic is reversely ended, and when Q3 is turned off, inductance is connected equivalent to a power supply with AC power, and voltage is higher than direct current
Electrochemical capacitor (BUS electric capacity) both end voltage of bus, using Q1 internal body diodes rectifications, the electrochemical capacitor of dc bus is filtered,
Because the electrochemical capacitor of dc bus has had electricity after soft start, therefore only strobe, provide smooth to load
Dc source, positive half cycle terminates rear Q3 PWM and terminates.Single-chip microcomputer detects Q4 PWM when AC power is in negative half period and starts
Work, inductance L2 energy storage when Q4 PWM are opened, Q2 is reversely ended using internal body diodes unilateal conduction characteristic, when Q4 is turned off,
Inductance is connected equivalent to a power supply with AC power, and voltage is higher than electrochemical capacitor (BUS electric capacity) both end voltage of dc bus,
Using Q2 internal body diodes rectifications, the electrochemical capacitor of dc bus is filtered, and smooth dc source, negative half period knot are provided to load
Q4 PWM terminate after beam.
Soft starting circuit of the invention, starts in AC power and connects moment, soft relay closure of Single-chip Controlling, leads to
PTC thermistor current limliting is crossed, electrochemical capacitor is charged, effectively avoided because of the surge current mistake of AC power input
Greatly, cause the short circuit of electrochemical capacitor both end voltage, the impact of the power component of power-supply system damaged, realize the safety of charging with
Reliability.
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the invention, every utilization is not thereby limited
Equivalent structure or equivalent flow conversion that description of the invention and accompanying drawing content are made, or directly or indirectly it is used in other correlations
Technical field, be included within the scope of the present invention.
Claims (10)
1. a kind of soft starting circuit, it is characterised in that including relay element, rectifier, PTC thermistor, electrochemical capacitor and
Controller；
The relay element includes soft relay and main road relay；
Described soft relay one end connects AC power, and the other end connects the input of rectifier, the output of the rectifier
Anode connects described PTC thermistor one end, and the PTC thermistor other end connects the electrochemical capacitor anode, the electricity
Solution electric capacity negative terminal is connected with the rectifier negative terminal, forms loop；
Described main road relay one end connects AC power, and the other end is connected with main circuit, and the main circuit is connected to the electricity
The positive and negative two ends of solution electric capacity；
When AC power is input into be connected, the controller controls the soft relay closure；
When the charging voltage at the controller detection electrochemical capacitor two ends reaches preset value, the soft relay is controlled
Disconnect, the main road relay closure.
2. soft starting circuit according to claim 1, it is characterised in that the resistance and power root of the PTC thermistor
Adjusted according to power size needed for load.
3. soft starting circuit according to claim 1, it is characterised in that the preset value of the charging voltage be more than or
Equal to the 60% of AC power input voltage.
4. soft starting circuit according to claim 3, it is characterised in that the controller includes single-chip microcomputer；
The single-chip microcomputer calculates the charging voltage preset value of the electrochemical capacitor by detecting AC power input voltage.
5. soft starting circuit according to claim 4, it is characterised in that electrochemical capacitor two ends described in the monolithic machine testing
Real-time voltage, by the contrast of the real-time voltage and predeterminated voltage at the electrochemical capacitor two ends；And according to the result of contrast, sentence
The disconnected relay switch state.
6. soft starting circuit according to claim 5, it is characterised in that the single-chip microcomputer is input into AC power and connects
When, soft relay closure described in the Single-chip Controlling；
When electrochemical capacitor described in the monolithic machine testing charges, the real-time voltage of two ends storage is less than the electrochemical capacitor two ends
Preset voltage value, soft relay described in the Single-chip Controlling persistently closed, and the main road relay is failure to actuate；
When electrochemical capacitor described in the monolithic machine testing charges, the real-time voltage of two ends storage is more than or equal to the electrolysis
The preset voltage value at electric capacity two ends, soft relay described in the Single-chip Controlling disconnects, the main road relay closure.
7. soft starting circuit according to claim 1, it is characterised in that the electrochemical capacitor using dc bus electrolysis
Electric capacity.
8. soft starting circuit according to claim 1, it is characterised in that also including fuse, described fuse one end connects
AC power is connect, the other end connects the relay element.
9. soft starting circuit according to claim 1, it is characterised in that the main circuit includes inductance and rectifier bridge；
Described main road relay one end connects AC power, and the other end connects one end of the inductance, the other end of the inductance
The rectifier bridge input is connected, the rectification bridge output end connects the electrochemical capacitor two ends, and the electrochemical capacitor is entered
Row charges, and electrochemical capacitor load to needed for provides electric energy.
10. soft starting circuit according to claim 9, it is characterised in that the rectifier bridge includes that rectifying tube and stabilization are opened
Close element；
The rectifying tube carries out rectification by the energy storage to the inductance, then is filtered by the electrochemical capacitor；
The voltage at the electrochemical capacitor two ends is stablized in the stable switch element control, and the electric energy of stabilization is provided to required load.
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| CN201611169972.9A CN106787664A (en) | 2016-12-16 | 2016-12-16 | Soft starting circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611169972.9A CN106787664A (en) | 2016-12-16 | 2016-12-16 | Soft starting circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108832703A (en) * | 2018-06-14 | 2018-11-16 | 珠海格力电器股份有限公司 | Capacitor charging circuit, air conditioner and control method |
| CN108847803A (en) * | 2018-05-12 | 2018-11-20 | 广东希塔变频技术有限公司 | Frequency conversion control circuit, transducer air conditioning control circuit and transducer air conditioning |
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| JPH07308020A (en) * | 1994-05-10 | 1995-11-21 | Hitachi Ltd | Air-conditioner |
| CN1553551A (en) * | 2003-06-06 | 2004-12-08 | 中兴通讯股份有限公司 | AC inputting high-voltage protector |
| CN101388642A (en) * | 2008-07-09 | 2009-03-18 | 哈尔滨工业大学 | Power-on buffering and dynamic urgent braking apparatus for AC servo system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108847803A (en) * | 2018-05-12 | 2018-11-20 | 广东希塔变频技术有限公司 | Frequency conversion control circuit, transducer air conditioning control circuit and transducer air conditioning |
| CN108832703A (en) * | 2018-06-14 | 2018-11-16 | 珠海格力电器股份有限公司 | Capacitor charging circuit, air conditioner and control method |
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