CN102468760B - Power supply device, control method thereof and power supply system using power supply device - Google Patents
Power supply device, control method thereof and power supply system using power supply device Download PDFInfo
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- CN102468760B CN102468760B CN201010538320.4A CN201010538320A CN102468760B CN 102468760 B CN102468760 B CN 102468760B CN 201010538320 A CN201010538320 A CN 201010538320A CN 102468760 B CN102468760 B CN 102468760B
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Abstract
The invention discloses a power supply device, a control method of the power supply device, and a power supply system using the power supply device, wherein the power supply device comprises a power converter used for converting input voltage into internal output voltage, an output protective circuit which is electrically connected between an output end of the power converter and an output end of the power supply device and is used for protecting the power supply device for normal work by the connecting or disconnecting action, and a control unit which is electrically connected with the output protective circuit and is used for controlling the work of the output protective circuit, wherein when the working frequency of the power supply device is more than the first default frequency value and the value of the internal output voltage is more than the first default voltage value, the control unit can be used for controlling the output protective circuit to be stopped by outputting a first control signal to a control end of the output protective circuit. Through the invention, the power supply devices which work normally can be prevented from being burnt out by reverse current or overhigh working frequency caused by one faulted power supply device.
Description
Technical field
The present invention relates to control method and the electric supply system of a kind of power supply unit and power supply unit, espespecially high-reliability and be applicable to the power supply unit of redundant formula electric supply system and a control method for power supply unit, and this electric supply system uses the work of multiple power supply unit parallel operation.
Background technology
In recent years along with scientific and technological progress, the electronic product with difference in functionality of all kinds is developed gradually, these electronic products with difference in functionality of all kinds have not only met people's various different demands, more incorporate everyone daily life, people are lived more convenient.
The electronic product of these difference in functionalitys of all kinds is made up of various electronic component, and the required supply voltage of each electronic component is not quite similar, therefore the AC power (civil power) that, power supply system now provides is also not suitable for directly offering electronic product and uses.In order to provide suitable voltage to each electronic component, it normally to be worked, these electronic products need to be by power-switching circuit by AC power, and for example general civil power is converted to suitable voltage and uses to electronic product.Along with the power consumption of electronic product is different with the occasion of application, in order to improve the reliability (reliability) and the job requirement that reaches fault tolerant type of power supply, the electric supply system (redundancy power system) of redundant formula can use multiple power supply units while parallel operations to electronic product, because of one of them power supply unit fault or damage, cause electric supply system to stop power supply and to electronic product, electronic product is quit work preventing.
Refer to Fig. 1, the circuit framework schematic diagram that it is known electric supply system.As shown in Figure 1, known electric supply system 1 comprise structural similarity and rated output voltage value identical more than power supply unit 10, be electrically connected in parallel and form the electric supply system 1 of standby slow formula by the output of multiple power supply units 10.In the time of work, the output voltage V o ' of required voltage value when each power supply unit 10 can be converted to input voltage vin electronic product (not indicating in figure) work, for example 12V (volt), and each power supply unit 10 is shared (Current sharing) jointly to be provided to the system output current Io ' of electronic product (not indicating in figure), and system output current Io ' equals the sum total of output current the Io1 '～Ion ' of all power supply units 10.
As shown in Figure 1; known each power supply unit 10 comprises supply convertor 101 (converter) and output protection circuit 102; power supply unit 10 is converted to input voltage vin after interior output voltage V o1 ' by the switching action (switching) of (not indicating in the figure) conducting of an inner switching circuit or cut-off, and the electric energy of interior output voltage V o1 ' is sent to electronic product (not indicating in figure) via output protection circuit 102 again.In the present embodiment; output protection circuit 102 by multiple diode D (diode) in parallel form there is buffering and protective feature or gate diode (ORing Diode); each diode D is electrically connected between the output of supply convertor 101 and the output of power supply unit 10, in order to the flow through sense of current of output current Io1 ' of output protection circuit 102 of restriction.In the time of one of them power supply unit 10 short circuit or fault; the diode D of output protection circuit 102 can prevent that power supply unit 10 from backward current (reverse current) occurring, and prevents that the output current Io1 ' reverse flow of power supply unit 10 is back in power supply unit 10.For example, when one of them power supply unit 10 short circuit; output protection circuit 102 can effectively prevent that backward current from flowing into the power supply unit 10 breaking down; for another example one of them power supply unit 10 breaks down and causes output voltage to raise, and output protection circuit 102 can effectively prevent that backward current from flowing into the power supply unit 10 not breaking down.Although; utilize the output protection circuit 102 of diode D composition can effectively prevent that backward current from occurring; but diode D has larger electric conduction pressure drop; therefore the conducting of diode D loss (conduction loss) is larger; power supply unit 10 is lower with the whole efficiency of electric supply system 1, and working temperature is higher.
Please refer to Fig. 2 and coordinate Fig. 1, the structural representation that wherein Fig. 2 is another kind of known electric supply system.As shown in Figure 2; the power supply unit 20 of known electric supply system 2 utilizes the multiple diode Ds of multiple power transistor M (power transistor) in replacing shown in Fig. 1, with form there is buffering and protective feature or door field-effect transistor (Oring FET) output protection circuit 102.Because power transistor M has the characteristic that conduction impedance is lower and electric conduction pressure drop is less; therefore the output protection circuit 102 consisting of multiple power transistor M, can make power supply unit 20 and power loss minimizing, the working temperature of electric supply system 2 reduce and whole efficiency increases.In the present embodiment, control circuit 203 is according to output voltage V o ' and both voltage differences of interior output voltage V o1 ', be electric conduction pressure drop Vt (Vt=Vo '-Vo1 '), control multiple power transistor M conducting or cut-off, in the time there is backward current in power supply unit 20, control circuit 203 can be judged power supply unit 20 by the magnitude of voltage of electric conduction pressure drop Vt backward current occurs, and the multiple power transistor M cut-offs of corresponding control.
Please refer to Fig. 3 and coordinate Fig. 2, the state that wherein Fig. 3 is power transistor and the corresponding relation schematic diagram of electric conduction pressure drop.As shown in Figure 3, the corresponding relation tool lagging characteristics (hysteresis) of the state of power transistor and electric conduction pressure drop, its working method is described as follows:
(1) in the time that the magnitude of voltage of electric conduction pressure drop Vt is greater than the second default voltage value Vref2 (Vt > Vref2), represent that backward current occurs power supply unit 10, control circuit 203 can correspondingly be controlled multiple power transistor M cut-offs;
(2) in the time that the magnitude of voltage of electric conduction pressure drop Vt is less than the first default voltage value Vref1 (Vt > Vref1), represent that backward current does not occur power supply unit 10, control circuit 203 can correspondingly be controlled multiple power transistor M conducting;
(3), when between the magnitude of voltage of the electric conduction pressure drop Vt stagnant regions between between the first default voltage value Vref1 and the second default voltage value Vref2, control circuit 203 can correspondingly be controlled multiple power transistor M and keep laststates;
In the present embodiment, if the supply convertor 101 of power supply unit 20 is the supply convertor of a resonant mode, in the time of one of them power supply unit 20 fault, the power supply unit 20 of fault can make the magnitude of voltage of output voltage V o ' rise and exceed load voltage value, for example exceed 12V, and the magnitude of voltage of the interior output voltage V o1 ' of the corresponding power supply unit 20 that makes normal work rises, now, the supply convertor 101 of the power supply unit 20 of normal work drops to load voltage value for the magnitude of voltage that makes output voltage V o ', for example 12V, the operating frequency of the switching circuit (not indicating in figure) of the supply convertor 101 of the power supply unit 20 of normal work can increase, after arriving to a certain degree, operating frequency can cause the supply convertor 101 of the power supply unit 20 of normal work to burn.
Therefore, how to develop a kind of improve the power supply unit of above-mentioned known technology defect and the control method of power supply unit taking and applicable electric supply system real in current problem in the urgent need to address.
Summary of the invention
The control method that the object of the present invention is to provide a kind of power supply unit and power supply unit with and applicable electric supply system, make the power supply unit generation backward current of normal work or the operating frequency can be too high and burn with the power supply unit that prevents from hindering for some reason, there is higher whole efficiency, less power loss and lower working temperature simultaneously.
For reaching above-mentioned purpose, of the present invention one compared with broad sense execution mode for a kind of power supply unit is provided, in order to receive the electric energy of input voltage and to produce output voltage, comprise: supply convertor, in order to input voltage is converted to interior output voltage; Output protection circuit, is electrically connected between the output of supply convertor and the output of power supply unit, and in order to the action by conducting or cut-off, protection power source supply is normally worked it; And control unit, be electrically connected at output protection circuit, in order to control output protection circuit work; Wherein, when the magnitude of voltage that is greater than the first default frequency value and interior output voltage when the operating frequency of supply convertor is greater than the first default voltage value, control unit is by exporting the first control end that controls signal to output protection circuit to control output protection circuit cut-off.
For reaching above-mentioned purpose, of the present invention another compared with broad sense execution mode for a kind of electric supply system is provided, produce output voltage and system output current in order to receive the electric energy of input voltage, comprise: multiple power supply units, be connected in parallel with each other, and wherein at least one power supply unit comprises: supply convertor, in order to input voltage is converted to interior output voltage; Output protection circuit, is electrically connected between the output of supply convertor and the output of power supply unit, and in order to the work by conducting or cut-off, protection power source supply is normally worked it; And control unit, be electrically connected at output protection circuit, in order to control output protection circuit work; Wherein, when the magnitude of voltage that is greater than the first default frequency value and interior output voltage when the operating frequency of supply convertor is greater than the first default voltage value, control unit is by exporting the first control end that controls signal to output protection circuit to control output protection circuit cut-off.
For reaching above-mentioned purpose, of the present invention another compared with broad sense execution mode for a kind of control method of power supply unit is provided, comprise step: provide supply convertor, in order to input voltage is converted to interior output voltage; Output protection circuit is provided, is electrically connected between the output of supply convertor and the output of power supply unit, in order to the action by conducting or cut-off, protection power source supply is normally worked it; Output voltage in detecting; Detect the operating frequency of supply convertor; The magnitude of voltage of interior output voltage and the first default voltage value; Relatively frequency values and the first default frequency value of operating frequency; And the magnitude of voltage that is greater than the first default frequency value and interior output voltage when the frequency values of the operating frequency of supply convertor is while being greater than the first default voltage value, controls output protection circuit cut-off.
Beneficial effect of the present invention is, the control method of power supply unit provided by the present invention and power supply unit with and applicable electric supply system, can prevent from can too highly burning because the power supply unit of fault makes power supply unit generation backward current or the operating frequency of normal work, there is higher whole efficiency, less power loss and lower working temperature simultaneously.
Brief description of the drawings
Fig. 1: be the circuit framework schematic diagram of known electric supply system.
Fig. 2: be the structural representation of the known electric supply system of another kind.
Fig. 3: be the state of power transistor and the corresponding relation schematic diagram of electric conduction pressure drop.
Fig. 4 A: be the circuit block diagram of the electric supply system of preferred embodiment of the present invention.
Fig. 4 B: be the DC current gain of supply convertor and the corresponding relation schematic diagram of operating frequency of preferred embodiment of the present invention.
Fig. 5: be the circuit diagram of the power supply unit of preferred embodiment of the present invention.
Fig. 6: be the circuit diagram of the first control circuit of preferred embodiment of the present invention.
Fig. 7: be the circuit diagram of the power supply unit of another preferred embodiment of the present invention.
Fig. 8: be the control method schematic diagram of the power supply unit of preferred embodiment of the present invention.
Wherein, description of reference numerals is as follows:
1,2: electric supply system 10,20: power supply unit
101: supply convertor 102: output protection circuit
203: control circuit Vin: input voltage
Vo ': system output voltage Io ': system output current
Vo1 ': interior output voltage
Io1 '～Ion ': the output current of power supply unit
D: diode M: power transistor
Vt: electric conduction pressure drop Vs: the first control signal
OUTA: the second control signal OUTB: the 3rd control signal
Vo: output voltage V o1: interior output voltage
Io: system output current
Io1～Ion: the output current of power supply unit
Fs: operating frequency fo: rated frequency
Veaout: error amplification signal Vk: count signal
Vp1: the first comparison signal Vp2: the second comparison signal
Vref1: the first default voltage value
Vref2: the second default voltage value
V1～V2: first～second voltage Vcc: boost voltage
3: electric supply system 4: power supply unit
40: supply convertor 400: switching circuit
401: resonant circuit 402: output rectification circuit
41: output protection circuit 41a: switch element
42: control unit 421: first control circuit
4212: the second comparison circuits of 4211: the first comparison circuits
4213: AND gate 4214: drive circuit
422: second control circuit 4221: feedback circuit
4222: synchronous commutating control circuit 4223: error amplifying circuit
4224: bleeder circuit 4225: frequency detection circuit
IC604: controller
R649: the first resistance R 650; The second resistance
R651: the 3rd resistance R 652: the four resistance
R643: the 5th resistance R 644: the six resistance
R646: the 7th resistance R 647: the eight resistance
R645: the 9th resistance R 603: the ten resistance
Rp: the 11 resistance D605: the first diode
D608: the second diode D168: the 3rd diode
OP1: the first operational amplifier OP2: the second operational amplifier
K1: series connection end
Q1～Q4: the first～four switch element
Q5～Q6: the five～six switch element
Q605: driving switch element Cin: input capacitance
Co: output capacitance
Lr: the first resonant inductance Cr: resonant capacitance
Lm: the second resonant inductance T: transformer
Np: primary side Ns: primary side
Embodiment
Some exemplary embodiments that embody feature & benefits of the present invention will describe in detail in the explanation of back segment.Be understood that the present invention can have various variations on different execution modes, it neither departs from the scope of the present invention, and explanation wherein and accompanying drawing be when the use that explain in itself, but not in order to limit the present invention.
Refer to Fig. 4 A and coordinate Fig. 4 B, the circuit block diagram of the electric supply system that wherein Fig. 4 A is preferred embodiment of the present invention, and the corresponding relation schematic diagram of the DC current gain of the supply convertor that Fig. 4 B is preferred embodiment of the present invention and operating frequency.As shown in Figure 4 A, electric supply system 3 of the present invention has multiple power supply unit 4 parallel connections provides output voltage V o to-load (not indicating in figure), to form the electric supply system of redundant formula.In the time of work, the output voltage V o of required voltage value when each power supply unit 4 can be converted to input voltage vin load (not indicating in figure) work, for example 12V, and each power supply unit 4 is shared (Current sharing) jointly to be provided to the system output current Io of load (not indicating in figure), and system output current Io equals the sum total of the output current Io1～Ion of all power supply units 4.Wherein, the magnitude of voltage of interior output voltage V o1 for example, slightly higher than the magnitude of voltage of output voltage V o, 12.1V.
At least one or each power supply unit 4 comprises: supply convertor 40, output protection circuit 41 and control unit 42; wherein; the input of the input of supply convertor 40 and power supply unit 4 is electrically connected; and the switching action (switching) by (not indicating in the figure) conducting of an inner switching circuit or cut-off is converted to input voltage vin after one interior output voltage V o1 (+12VL), the electric energy of interior output voltage V o1 is sent to load (not indicating in figure) via output protection circuit 41 again.Output protection circuit 41 is electrically connected between the output of supply convertor 40 and the output of power supply unit 4; in the present embodiment; output protection circuit 41 comprises at least one switch element 41a and is electrically connected between the output of supply convertor 40 and the output of power supply unit 4; but not as limit, also can form output protection circuit 41 by multiple switch elements (not shown) that is electrically connected in parallel.
Control unit 42 is electrically connected at supply convertor 40 and output protection circuit 41, works with output protection circuit 41 in order to control respectively supply convertor 40.Control unit 42 comprises: first control circuit 421 and second control circuit 422; wherein; first control circuit 421 is according to operating frequency fs control corresponding to interior output voltage V o1 output protection circuit 41 conductings or the cut-off of supply convertor 40; the second control circuit 422 interior output voltage V o1 control of foundation supply convertor 40 is worked; make the magnitude of voltage of interior output voltage V o1 be maintained load voltage value, for example 12V.Wherein the operating frequency fs of supply convertor 40 and the state of interior output voltage V o1 can be exported corresponding respectively signal and obtain after sampling processing with feedback module (not shown) by the detection module in second control circuit 422, for example feedback signal and/or frequency signal.Control unit 42 can adopt artificial circuit (analogcircuit), digital circuit (digital circuit) or simulated digital hybrid circuit (analog-digital mixingcircuit) to realize in the present invention, same first control circuit 421 also can adopt respectively artificial circuit, digital circuit or simulated digital hybrid circuit to realize with second control circuit 422, and concrete execution mode can be in subsequent embodiment illustrated but is not limited to the description content of this specification.Refer to Fig. 4 B, in the present embodiment, the DC current gain (DC Gain (Vo 1/Vin)) of supply convertor 40 can change along with the ratio value (fs/fo) of operating frequency fs and rated frequency fo, be that DC current gain can correspondence reduce along with the increase of operating frequency fs, in the time that the magnitude of voltage of interior output voltage V o1 is greater than load voltage value, second control circuit 422 can corresponding increase the operating frequency fs of supply convertor 40.On the contrary, in the time that the magnitude of voltage of interior output voltage V o1 is less than load voltage value, second control circuit 422 can corresponding downgrade the operating frequency fs of supply convertor 40.Therefore, second control circuit 422 can make the magnitude of voltage of interior output voltage V o1 be maintained load voltage value by the operating frequency fs that adjusts supply convertor 40, for example 12V.
Referring again to Fig. 4 A and coordinate Fig. 4 B, in the present embodiment, make output voltage V o and the magnitude of voltage of the interior output voltage V o1 of the power supply unit 4 of normal work increase while exceeding load voltage value when one of them power supply unit 4 fault, for example exceed 12V, the supply convertor 40 of the power supply unit 4 of normal work is in order to make output voltage V o and the magnitude of voltage of the interior output voltage V o1 of the power supply unit 4 of normal work drop to load voltage value, for example 12V, the operating frequency fs of the control unit 42 meeting control switch circuit (not indicating in figure) of the power supply unit 4 of normal work increases.When operating frequency, fs continues to increase, when the magnitude of voltage that makes the operating frequency fs of the supply convertor 40 of the power supply unit 4 of normal work be greater than the interior output voltage V o1 of the power supply unit 4 of the first default frequency value fref1 (fs > fref1) and normal work is greater than the first default voltage value Vref1 (Vol > Vref1), control unit 42 can end to switch element 41a control switch element 41a by the first control signal Vs of output disabled state (disabled state), except can preventing that the supply convertor 40 of normal power supply unit 4 of working from burning because operating frequency increases, there is backward current in the power supply unit 4 that more can effectively prevent normal work.
In the present embodiment, first control circuit 421 comprises: the first comparison circuit 4211, the second comparison circuit 4212, AND gate 4213 (AND logic circuit) and drive circuit 4214 (drivingcircuit), wherein the first comparison circuit 4211 is electrically connected between the output and AND gate 4213 of supply convertor 40, in order to judge whether the magnitude of voltage of interior output voltage V o1 is greater than the first default voltage value Vref1 (Vol > Vref1).The second comparison circuit 4212 is electrically connected between second control circuit 422 and AND gate 4213, in order to judge whether operating frequency fs is greater than the first default frequency value fref1 (fs > fref1).
AND gate 4213 is electrically connected at the first comparison circuit 4211, the second comparison circuit 4212 and drive circuit 4214, and the second comparison signal Vp2 exporting in order to the first comparison signal Vp1 that the first comparison circuit 4211 is exported and the second comparison circuit 4212 carries out logical operation.Drive circuit 4214 is electrically connected between the control end of switch element 41a and the output of AND gate 4213, in order to according to the 41a conducting of result driving switch element or cut-off after AND gate 4213 logical operations.
In the time that the magnitude of voltage of interior output voltage V o1 is greater than the first default voltage value Vref1 (Vol > Vref1) and operating frequency fs and is greater than the first default frequency value fref1 (fs > fref1), the first comparison signal Vp1 of the first comparison circuit 4211 and the second comparison circuit 4212 meeting difference output enable states and the second comparison signal Vp2 are to AND gate 4213, and via the result after AND gate 4213 logical operations, the the first control signal Vs that makes drive circuit 4214 export disabled state ends with driving switch element 41a.
On the contrary, in the time that the magnitude of voltage of interior output voltage V o1 is less than the first default voltage value Vref1 (Vol < Vref1) or operating frequency fs and is less than the first default frequency value fref1 (fs < fref1), the first comparison signal Vp1 of the first comparison circuit 4211 or the corresponding output of the second comparison circuit 4212 meeting difference disabled state or the second comparison signal Vp2 are to AND gate 4213, and via the result after AND gate 4213 logical operations, make the first control signal Vs of drive circuit 4214 output enable states (enabled state) with driving switch element 41a conducting.
In the present invention, be not limited to any concrete execution mode and obtain and be relevant to the interior output voltage V o1 of supply convertor 40 and the signal of operating frequency fs, thereby the cut-off of control protection electric circuit 41 or conducting are to reach the object of protection power source converter 40.Because, supply convertor 40 is numerous with the kind of control unit 42, below its implementation and operation principle will be exemplified respectively to illustrate.
Refer to Fig. 5 and coordinate Fig. 4 A, the circuit diagram of the power supply unit that wherein Fig. 5 is preferred embodiment of the present invention.As shown in Figure 5, supply convertor 40 is LLC (inductance-inductor-capacitor) serial-resonant and comprises: input capacitance Cin, switching circuit 400, resonant circuit 401 (resonant circuit), transformer T (Transformer), output rectification circuit 402 and output capacitance Co, and second control circuit 422 comprises: feedback circuit 4221 (feedback circuit), synchronous commutating control circuit 4222 (Synchronous rectifier controlling circuit) and controller IC 604.
In supply convertor 40; input capacitance Cin is electrically connected at the input side of switching circuit 400; resonant circuit 401 is electrically connected between the outlet side of switching circuit 400 and the primary side Np of transformer T (primary side); output rectification circuit 402 is electrically connected at the primary side Ns (secondary side) of transformer T; one end of output capacitance Co is electrically connected at output rectification circuit 402 and output protection circuit 41, and the other end of output capacitance Co is electrically connected at the negative terminal (ground connection symbol) of power supply unit 4.
Feedback circuit 4221 is electrically connected between the output and controller IC 604 of supply convertor 40, produce error amplification signal Veaout to controller IC 604 in order to the magnitude of voltage according to interior output voltage V o1, make controller IC 604 whether maintain load voltage value, for example 12V by the magnitude of voltage of output voltage V o1 in error amplification signal Veaout judgement.In the present embodiment, the feedback signal changing along with operating frequency fs is error amplification signal Veaout, in order to represent frequency signal, feedback circuit 4221 provides error amplification signal Veaout to the second comparison circuit 4212 that becomes inverse change trend with operating frequency fs, the error amplification signal Veaout that the second comparison circuit 4212 is provided by second control circuit 422 judges whether operating frequency fs is greater than the first default frequency value fref1 (fs > fref1), be whether error in judgement amplifying signal Veaout is less than the first acquiescence error amplification signal value Veaout1 (Veaout < Veaout1).
In the present embodiment, feedback circuit 4221 comprises: error amplifying circuit 4223 (Error amplifiercircuit) and bleeder circuit 4224, interior output voltage V o1 produces error amplification signal Veaout after sequentially processing via bleeder circuit 4224 and error amplifying circuit 4223, therefore, the magnitude of voltage of error amplification signal Veaout can change along with the magnitude of voltage of interior output voltage V o1.In the present embodiment, error amplifying circuit 4223 is a proportional integral circuit (Proportional-Integral circuit), but not as limit, in other embodiment, error amplifying circuit 4223 can be the circuit of a ratio circuit (Proportional circuit), an integrating circuit (Integral circuit) or its combination, can also be other other implementations that can realize output error amplifying signal Veaout.
Controller IC 604 is also electrically connected at the control end of switching circuit 400, the for example control end of the first～four switch element Q1～Q4, in order to produce the control end of at least one the second control signal OUTA to switching circuit 400 according to error amplification signal Veaout, make the magnitude of voltage of interior output voltage V o1 maintain load voltage value with the switch operating of 400 conductings of control switch circuit or cut-off, for example 12V, wherein, controller IC 604 makes the magnitude of voltage of interior output voltage V o1 maintain load voltage value by operating frequency fs and/or the duty ratio (duty ratio) of adjusting switching circuit 400.
In the present embodiment, switching circuit 400 is for full-bridge type (full bridge) and comprise the first～four switch element Q1～Q4, wherein the first switch element Q1 and the 3rd switch element Q3 are electrically connected in parallel in input capacitance Cin two ends after being electrically connected in series and forming the first switch bridge (switch bridge) again, second switch element Q2 and the 4th switch element Q4 are electrically connected in parallel in input capacitance Cin two ends after being electrically connected in series and forming second switch bridge again, and the first switch bridge and second switch bridge are electrically connected in parallel in input capacitance Cin.Controller IC 604 is electrically connected at the control end of the first～four switch element Q1～Q4, and produces respectively the second control signal OUTA and the 3rd control signal OUTB and be sent to the control end of the first～four switch element Q1～Q4 according to error amplification signal Veaout.Wherein, controller IC 604 passes through the second control signal OUTA control first, the 4th switch element Q1, Q4 conducting or cut-off, and control second, third switch element Q2, Q3 conducting or cut-off by the 3rd control signal OUTB.In this example, because the magnitude of voltage of error amplification signal Veaout can change along with the magnitude of voltage of interior output voltage V o1, and the operating frequency fs that controller IC 604 is adjusted the second control signal OUTA and the 3rd control signal OUTB according to error amplification signal Veaout makes the magnitude of voltage of output voltage V o1 maintain load voltage value, therefore in the time that supply convertor 40 is worked, the second control signal OUTA that controller IC 604 produces according to error amplification signal Veaout can become inverse change trend along with error amplification signal Veaout with the operating frequency fs of the 3rd control signal OUTB, make the magnitude of voltage of output voltage V o be maintained load voltage value.
Resonant circuit 401 can be but not be limited to LLC serial-resonant or LLC parallel resonance formula (not shown), in the present embodiment, resonant circuit 401 is LLC serial-resonant and comprises: the first resonant inductance Lr, resonant capacitance Cr and the second resonant inductance Lm, the first resonant inductance Lr, resonant capacitance Cr and the second resonant inductance Lm are electrically connected in series at the outlet side of switching circuit 400.Second control circuit 422 control switch circuit 400 are optionally sent to resonant circuit 401 by the electric energy of input voltage vin via switching circuit 400, and utilize the resonance characteristic decision electric energy of resonant circuit 401 to be sent to the number of the primary side Np of transformer T, and reach the object that input voltage vin is converted to interior output voltage V o1.
In the present embodiment, output rectification circuit 402 is not for synchronous rectification formula but as limit, it comprises: the 5th switch element Q5 and the 6th switch element Q6, wherein, the 5th switch element Q5 is electrically connected between one end of primary side Ns and the negative output terminal of power supply unit 4 of transformer T, and the 6th switch element Q6 is electrically connected between the other end of primary side Ns and the negative output terminal of power supply unit 4 of transformer T.Synchronous commutating control circuit 4222 is electrically connected at the control end of output rectification circuit 402, the i.e. control end of the 5th switch element Q5 and the 6th switch element Q6, and reach the object of rectification by controlling the staggered conducting of the 5th switch element Q5 and the 6th switch element Q6 or cut-off.In the time of the 5th switch element Q5 conducting and the 6th switch element Q6 cut-off, electric current can be flowed out by the centre cap of the primary side Ns of transformer T (center tap), and sequentially flows to output capacitance Co and the 5th switch element Q5.In the time of the 6th switch element Q6 conducting and the 5th switch element Q5 cut-off, electric current can be flowed out by the centre cap of the primary side Ns of transformer T, and sequentially flows to output capacitance Co and the 6th switch element Q6.
Refer to Fig. 6 and coordinate Fig. 4 A and Fig. 5, the circuit diagram of the first control circuit that wherein Fig. 6 is preferred embodiment of the present invention.As shown in Figure 6, the first comparison circuit 4211 comprises: the first resistance R 649, the second resistance R 650, the 3rd resistance R 651, the 4th resistance R 652, the first diode D605 and the first operational amplifier OP1 (Operation Amplifier), wherein the first resistance R 649 is electrically connected with the output of supply convertor 40, and is electrically connected in series with the second resistance R 650.The 3rd resistance R 651 is electrically connected between series connection end K1 and the positive input terminal of the first operational amplifier OP1 (IC607), the 4th resistance R 652 and the first diode D605 are electrically connected in series between the output of the first operational amplifier OP1 and positive input terminal, the negative input end of the first operational amplifier OP1 receives one first voltage V1, for example 2.5V.
In the present embodiment, the second comparison circuit 4212 comprises: the 5th resistance R 643, the 6th resistance R 644, the 7th resistance R 646, the 8th resistance R 647, the second diode D608 and the second operational amplifier OP2, wherein one end of the 5th resistance R 643 and the 7th resistance R 646 is electrically connected at the positive input terminal of the second operational amplifier OP2, the other end of the 5th resistance R 643 is electrically connected at the negative terminal (ground connection symbol) of power supply unit 4, second voltage V2, for example 2.5V, is sent to the other end of the 7th resistance R 646.The 6th resistance R 644 and the second diode D608 are electrically connected in series between the output of the second operational amplifier OP2 and positive input terminal, one end of the 8th resistance R 647 is electrically connected at the negative input end of the second operational amplifier OP2, the other end of the 8th resistance R 647 is electrically connected at second control circuit 422 (not indicating in figure), and error amplification signal Veaout is sent to the other end of the 8th resistance R 647.
In the present embodiment, because the output of the first operational amplifier OP1 of the first comparison circuit 4211 and the second operational amplifier OP2 of the second comparison circuit 4212 is for opening drain electrode formula (open drain) or opener electric pole type (open collector), AND gate 4213 can be electrically connected at the 9th resistance R 645 and be formed by the mode (wire and) that the first operational amplifier OP1 is connected with wire with the output of the second operational amplifier OP2 the function of AND gate 4213, wherein one end of the 9th resistance R 645 is electrically connected at the output of the first comparison circuit 4211 and the second comparison circuit 4212, the other end of the 9th resistance R 645 receives a boost voltage Vcc, for example 5V.
In the present embodiment; drive circuit 4214 comprises: driving switch element Q605, the tenth resistance R the 603, the 11 resistance R p and the 3rd diode D168; wherein; driving switch element Q605 is electrically connected between the control end (not shown) of output protection circuit 41 and the negative terminal of power supply unit 4 (ground connection symbol), and the control end of driving switch element Q605 is electrically connected at the output of AND gate 4213.One end of the tenth resistance R 603 and the 3rd diode D168 is electrically connected at the control end of driving switch element Q605, and the other end of the tenth resistance R 603 and the 3rd diode D168 is electrically connected at the negative terminal of power supply unit 4 (ground connection symbol).One end of the 11 resistance R p is electrically connected at the negative terminal (ground connection symbol) of power supply unit 4, and the other end of the 11 resistance R p receives boost voltage Vcc.
In the present embodiment, (fs > fref1 in the time that the magnitude of voltage of interior output voltage V o1 is greater than the first default voltage value Vref1 (Vo1 > Vref1) and operating frequency fs and is greater than the first default frequency value fref1, Veaout < Veaout1), the first operational amplifier OP1 of the first comparison circuit 4211 and the second operational amplifier OP2 of the second comparison circuit 4212 can export respectively the first comparison signal Vp1 of enabled status of high potential and the second comparison signal Vp2 to AND gate 4213, and via the result after AND gate 4213 logical operations, the the first control signal Vs that makes the driving switch element Q605 conducting of drive circuit 4214 and export the disabled state of electronegative potential ends with driving switch element 41a.
In the present embodiment, the first comparison circuit 4211 and the second comparison circuit 4212 all have lagging characteristics, therefore, in the time that the magnitude of voltage of interior output voltage V o1 is less than the first default voltage value Vref1 (Vol < Vref1) with default voltage stagnant regions (the first default voltage value Vref1～the second default voltage value Vref2), now, the magnitude of voltage of series connection end K1 is less than the first voltage V1 (Vref1=V1 × (1+R649/R650)), the first comparison signal Vp1 of the disabled state of the corresponding output of the first operational amplifier OP1 meeting electronegative potential of the first comparison circuit 4211 is to AND gate 4213, and export the signal of electronegative potential via the result after AND gate 4213 logical operations, make the driving switch element Q605 cut-off of drive circuit 4214 and the first control signal Vs of the enabled status of output high potential with driving switch element 41a conducting.In the same manner, when the magnitude of voltage of interior output voltage V o1 increases and is greater than the second default voltage value Vref2 (Vo1 < Vref2, Vref2=V1 × (1+ (R651+R649)/R652+R649 × ((R651+R652)/R650/R652))) time,, when the magnitude of voltage of the positive input terminal of the first operational amplifier OP1 is greater than the first voltage V1, the first operational amplifier OP1 can export the first comparison signal Vp1 of the enabled status of high potential.
Similarly, in the present embodiment, when operating frequency fs is less than the first default frequency value fref1 (fs < fref1, Veaout > Veaout1) (the first default frequency value fref1～the second default frequency value fref2 when the default frequency stagnant regions, be that error amplification signal Veaout is greater than acquiescence error amplification signal stagnant regions (the first acquiescence error amplification signal value Veaout1～the second acquiescence error amplification signal value Veaout2)), now, the magnitude of voltage of error amplification signal Veaout is greater than first acquiescence error amplification signal value Veaout1 (Veaout1=V2 × R643/ (R643+R646), the second comparison signal Vp2 of the disabled state of the corresponding output of the second operational amplifier OP2 meeting electronegative potential of the second comparison circuit 4212 is to AND gate 4213, and export the signal of electronegative potential via the result after AND gate 4213 logical operations, make the driving switch element Q605 cut-off of drive circuit 4214 and the first control signal Vs of the enabled status of output high potential with driving switch element 41a conducting.
In the above embodiments, designer can pass through to adjust the magnitude of voltage size of the first voltage V1, and makes the first default voltage value Vref1 corresponding with the second default voltage value Vref2 adjusted.Wherein the first default voltage value Vref1=V1* (1+R649/R650), the second default voltage value Vref2=V1 × (1+ (R651+R649)/R652+R649* ((R651+R652)/R650/R652)).Similarly, designer can pass through to adjust the magnitude of voltage size of second voltage V2, and makes the first default frequency value fref1 and corresponding being adjusted of the second default frequency value fref2 (the first acquiescence error amplification signal value Veaout1 and the second acquiescence error amplification signal value Veaout2).Wherein the first acquiescence error amplification signal value Veaout1=V2*R643/ (R643+R646) corresponding to the first default frequency value fref1, the second acquiescence error amplification signal value Veaout2=V2* (R643//R644)/(R646+R643//R644), equal the second acquiescence error amplification signal value Veaout2 in the magnitude of voltage matter value of the positive input terminal of the second operational amplifier OP2 that the second default frequency value fref2 is corresponding.
In the above embodiments, in control unit 42, first control circuit 421 and second control circuit 422 are artificial circuit, but the present invention is not limited to this, wherein first control circuit 421 can adopt a digital signal processor (DPS, Digital Signal Processor) by the simulate signal of reception be converted to digital signal and by algorithm instruction (Algorithm/Instruction) complete comparison and with door function, same, second control circuit 422 also can adopt similar digital control approach to realize, for example adopt digital error amplifier the simulate signal of reception is converted to digital signal and completes by algorithm instruction, and first control circuit 421 and second control circuit 422 can be integrated in same digital signal processor and realize.
Refer to Fig. 7 and coordinate Fig. 8 and Fig. 5, the circuit diagram of the power supply unit that wherein Fig. 7 is another preferred embodiment of the present invention, and the control method schematic diagram of the power supply unit that Fig. 8 is preferred embodiment of the present invention.The present embodiment (shown in Fig. 7) is with the difference of previous embodiment, the second control circuit 422 of Fig. 7 also arranges a frequency detection circuit 4225, for example counting circuit, be electrically connected on controller IC 604 and the second comparison circuit 4212, wherein, frequency detection circuit 4225 can export the second control signal OUTA of switching circuit 400 or/and the number of pulses of the 3rd control signal OUTB to by calculating a special time internal controller IC604, thereby obtain a count signal Vk relevant to the operating frequency fs of this supply convertor 40, the second comparison circuit 4212 judges by this count signal Vk whether operating frequency fs is greater than the first default frequency value fref1 (fs > fref1) again.In the present embodiment, second control circuit 422 has detection module and feedback module function, be count signal Vk and frequency detection circuit 4225 exports the feedback signal of the second comparison circuit 4212 to, in order to represent frequency signal, wherein frequency detection circuit 4225 can also by detect any one have the signal relevant to operating frequency fs obtain along with operating frequency fs change frequency signal, for example, utilize in the electric current on the first～four switch element Q1～Q4 in switching circuit 400 or switching circuit 400 first and the contact (node) of the 3rd switch element Q1 and Q3 or second and the voltage of the contact of the 4th switch element Q2 and Q4 etc. all can be used as the detection signal input of frequency detection circuit 4225, thereby obtain the frequency signal changing along with the operating frequency fs of this supply convertor 4, for example count signal Vk.
In the present embodiment, first control circuit 421 can adopt a digital signal processor (DPS, DigitalSignal Processor) by the simulate signal of reception be converted to digital signal and by algorithm instruction complete comparison with door function, same, second control circuit 422 also can adopt digital signal processor to realize tally function, and first control circuit 421 and second control circuit 422 can be integrated in same digital signal processor and realize.In the present embodiment, counting circuit detects and produces the count signal Vk of operating frequency fs that is relevant to supply convertor 40 and can be converted into a voltage signal, export the second comparison circuit 4212 to by aforesaid mode again and compare, that is adopt artificial circuit control mode to realize.In the above embodiments, switch element can be but not be limited to metal oxide semiconductcor field effect transistor (Metal Oxide Semiconductor Field Effect Transistor, MOSFET), bipolar junction transistor (Bipolar Junction Transistor, BJT), thyristor (Silicon-Controlled Rectifier, SCR), two carrier crystal pipe (the Insulated Gate Bipolar Transistor of insulated gate, or two-way thyristor switch (The triode AC switch, TRIAC) IGBT).
From the above, the thin portion step of the control method of the power supply unit of preferred embodiment of the present invention, comprises:
(a) provide supply convertor 40, in order to input voltage vin is converted to interior output voltage V o1;
(b) provide output protection circuit 41, be electrically connected between the output of supply convertor 40 and the output of power supply unit 4, in order to the work by conducting or cut-off, protection power source supply 4 is normally worked it;
(c) detect interior output voltage V o1;
(d) the operating frequency fs of detection supply convertor;
(e) the relatively magnitude of voltage of this interior output voltage V o1 and one first default voltage value Vref1;
(f) the relatively frequency values of this operating frequency fs and one first default frequency value fref1; And
(g), when the magnitude of voltage that is greater than the first default frequency value fref1 and interior output voltage V o1 when the frequency values of the operating frequency fs of supply convertor 40 is greater than the first default voltage value Vref1, control unit 42 is controlled output protection circuit 41 and is ended.
In sum; the control method of power supply unit of the present invention and power supply unit with and applicable electric supply system; make the magnitude of voltage of interior output voltage of the power supply unit of normal work and operating frequency too high during when one of them power supply unit fault; control unit can be controlled output protection circuit cut-off, makes the power supply unit generation backward current of normal work or the operating frequency can be too high and burn with the power supply unit that prevents from hindering for some reason.In addition; the switch element of output protection circuit has the characteristic that conduction impedance is lower and electric conduction pressure drop is less, therefore can make power supply unit of the present invention with and the power loss of applicable electric supply system reduces, working temperature reduces and whole efficiency increases.
Those skilled in the art should recognize that in the case of not departing from the scope and spirit of the present invention that the appended claim of the present invention discloses, the change of doing and retouching, within all belonging to the protection range of claim of the present invention.
Claims (31)
1. a power supply unit, in order to receive the electric energy of an input voltage and to produce an output voltage, comprises:
One supply convertor, in order to be converted to this input voltage one interior output voltage;
One output protection circuit, is electrically connected between the output of this supply convertor and the output of this power supply unit, in order to protect this power supply unit that it is normally worked by the action of conducting or cut-off; And
One control unit, is electrically connected at this output protection circuit, in order to control this output protection circuit work, comprises a first control circuit, and this first control circuit comprises:
One first comparison circuit, is electrically connected at the output of this supply convertor, in order to judge whether the magnitude of voltage of this interior output voltage is greater than one first default voltage value;
One second comparison circuit, in order to judge whether the frequency values of this operating frequency is greater than this first default frequency value; And
One AND gate, be electrically connected at the output of this first comparison circuit and this second comparison circuit, one second comparison signal in order to one first comparison signal to this first comparison circuit output and the output of this second comparison circuit carries out logical operation, makes result conducting or the cut-off of this output protection circuit counterlogic computing;
Wherein, when the magnitude of voltage that is greater than one first default frequency value and this interior output voltage when the frequency values of an operating frequency of this supply convertor is greater than this first default voltage value, this control unit is by exporting one first control end that controls signal to this output protection circuit to control this output protection circuit cut-off.
2. power supply unit as claimed in claim 1; it is characterized in that; this first control circuit comprises one drive circuit; this drive circuit is electrically connected between the control end of this output protection circuit and the output of this AND gate, in order to drive this output protection circuit conducting or cut-off according to the result after this AND gate logical operation.
3. power supply unit as claimed in claim 2; it is characterized in that; when the frequency values that is greater than this first default voltage value and this operating frequency when the magnitude of voltage of this interior output voltage is greater than this first default frequency value; this first comparison signal of this first comparison circuit and this second comparison circuit difference output enable state and this second comparison signal are to this AND gate; and via the result after this AND gate logical operation, make this drive circuit export this first control signal of disabled state and drive this output protection circuit cut-off.
4. power supply unit as claimed in claim 1, it is characterized in that, this control unit also comprises a second control circuit, and this second control circuit is electrically connected at this supply convertor, in order to control this supply convertor, this input voltage is converted to this interior output voltage.
5. power supply unit as claimed in claim 4, it is characterized in that, this second control circuit comprises a feedback circuit, this feedback circuit provides the feedback signal changing along with this operating frequency to this first control circuit, wherein, this first control circuit judges by this feedback signal whether the frequency values of this operating frequency is greater than this first default frequency value.
6. power supply unit as claimed in claim 5, it is characterized in that, this second control circuit also comprises a controller, this controller is electrically connected at this supply convertor and this feedback circuit, control signal to this supply convertor in order to produce at least one second according to this feedback signal, to control this supply convertor work, make the magnitude of voltage of this interior output voltage maintain load voltage value.
7. power supply unit as claimed in claim 5, is characterized in that, this feedback circuit comprises:
One error amplifying circuit, this error amplifying circuit is in order to be converted into this feedback signal by this interior output voltage, and this feedback signal is an error amplification signal.
8. power supply unit as claimed in claim 7, is characterized in that, this error amplifying circuit is selected from the circuit of a proportional integral circuit, a ratio circuit, an integrating circuit or its combination.
9. power supply unit as claimed in claim 7, is characterized in that, this error amplification signal becomes inverse change trend with this operating frequency.
10. power supply unit as claimed in claim 9, it is characterized in that, this second comparison circuit passes through relatively this error amplification signal and the one first acquiescence error amplification signal value corresponding to this first default frequency value, thereby judges whether the frequency values of this operating frequency is greater than this first default frequency value.
11. power supply units as claimed in claim 7, is characterized in that, this second comparison circuit comprises:
One second operational amplifier;
One the 5th resistance, is electrically connected at the positive input terminal of this second operational amplifier;
One second diode;
One the 6th resistance, the 6th resistance and this second diode are electrically connected in series between the output of this second operational amplifier and positive input terminal;
One the 7th resistance, one end of the 7th resistance is electrically connected at the positive input terminal of this second operational amplifier to receive a second voltage; And
One the 8th resistance, one end of the 8th resistance is electrically connected at the negative input end of this second operational amplifier, and the other end of the 8th resistance is electrically connected at this second control circuit to receive this error amplification signal.
12. power supply units as claimed in claim 1, is characterized in that, this first comparison circuit comprises:
One first resistance, the output that is electrically connected at this supply convertor end of connecting with;
One second resistance, is electrically connected in series in this end of connecting with this first resistance;
One first operational amplifier, the negative input end of this first operational amplifier receives one first voltage;
One the 3rd resistance, is electrically connected between this series connection end and the positive input terminal of this first operational amplifier;
One first diode; And
One the 4th resistance, the 4th resistance and this first diode are electrically connected in series between the output of this first operational amplifier and positive input terminal.
13. power supply units as claimed in claim 5, it is characterized in that, this feedback circuit comprises a counting circuit, and for the number of pulses that records the detection signal in certain hour, to export this feedback signal of this power supply unit operating frequency of a reaction, this feedback signal is a count signal.
14. power supply units as claimed in claim 13, it is characterized in that, this second control circuit also comprises a controller, this supply convertor work of this controller control, make the magnitude of voltage of this interior output voltage maintain load voltage value, this controller is electrically connected at this supply convertor and this feedback circuit, and this controller produces at least one second and controls signal to this supply convertor and this feedback circuit, and this detection signal is this second control signal.
15. power supply units as claimed in claim 13, is characterized in that, this second comparison circuit passes through relatively this count signal and this first default frequency value, thereby judges whether the frequency values of this operating frequency is greater than this first default frequency value.
16. power supply units as claimed in claim 1, it is characterized in that, the output of this first comparison circuit and this second comparison circuit is for opening drain electrode formula or opener electric pole type, and this AND gate comprises: one the 9th resistance, one end of the 9th resistance is electrically connected at the output of this first comparison circuit and this second comparison circuit, and the other end of the 9th resistance receives a boost voltage.
17. power supply units as claimed in claim 2; it is characterized in that; in the time that the magnitude of voltage of this interior output voltage is less than this first default voltage value or this operating frequency and is less than this first default frequency value; this first comparison signal of this first comparison circuit or the corresponding output of this second comparison circuit difference disabled state or this second comparison signal are to this AND gate; and via the result after this AND gate logical operation, make this first control signal of this drive circuit output enable state to drive this output protection circuit conducting.
18. power supply units as claimed in claim 2; it is characterized in that; this first comparison circuit has lagging characteristics; in the time that the magnitude of voltage of this interior output voltage is less than this first default voltage value and a default voltage stagnant regions; this first comparison signal of the corresponding output of this first comparison circuit disabled state is to this AND gate; and via the result after this AND gate logical operation, make this first control signal of this drive circuit output enable state to drive this output protection circuit conducting.
19. power supply units as claimed in claim 2; it is characterized in that; this second comparison circuit has lagging characteristics; in the time that this operating frequency is less than this first default frequency value and a default frequency stagnant regions; this second comparison signal of the corresponding output of this second comparison circuit disabled state is to this AND gate; and via the result after this AND gate logical operation, make this first control signal of this drive circuit output enable state to drive this output protection circuit.
20. power supply units as claimed in claim 1; it is characterized in that; this supply convertor comprises: a switching circuit, a resonant circuit and a transformer; wherein this resonant circuit is electrically connected between the outlet side of this switching circuit and the primary side of this transformer, and the primary side of this transformer is electrically connected at this output protection circuit.
21. power supply units as claimed in claim 1, is characterized in that, this supply convertor is inductance-inductor-capacitor serial-resonant or inductance-inductor-capacitor parallel resonance formula.
22. 1 kinds of electric supply systems, produce an output voltage and a system output current in order to receive the electric energy of an input voltage, comprise:
Multiple power supply units, are connected in parallel with each other, and wherein at least one power supply unit comprises:
One supply convertor, in order to be converted to this input voltage one interior output voltage;
One output protection circuit, is electrically connected between the output of this supply convertor and the output of this power supply unit, in order to protect this power supply unit that it is normally worked by the work of conducting or cut-off; And
One control unit, is electrically connected at this output protection circuit, in order to control this output protection circuit work, comprises a first control circuit, and this first control circuit comprises:
One first comparison circuit, is electrically connected at the output of this supply convertor, in order to judge whether the magnitude of voltage of this interior output voltage is greater than one first default voltage value;
One second comparison circuit, in order to judge whether the frequency values of this operating frequency is greater than this first default frequency value; And
One AND gate, be electrically connected at the output of this first comparison circuit and this second comparison circuit, one second comparison signal in order to one first comparison signal to this first comparison circuit output and the output of this second comparison circuit carries out logical operation, makes result conducting or the cut-off of this output protection circuit counterlogic computing;
Wherein, when the magnitude of voltage that is greater than one first default frequency value and this interior output voltage when the frequency values of an operating frequency of this supply convertor is greater than this first default voltage value, this control unit is by exporting one first control end that controls signal to this output protection circuit to control this output protection circuit cut-off.
23. electric supply systems as claimed in claim 22, it is characterized in that, this control unit also comprises a second control circuit, and this second control circuit is electrically connected at this supply convertor, in order to control this supply convertor, this input voltage is converted to this interior output voltage; This second control circuit comprises a feedback circuit and is electrically connected at the output of this supply convertor, this feedback circuit provides the feedback signal changing along with this operating frequency to this first control circuit, wherein, this first control circuit judges by this feedback signal whether the frequency values of this operating frequency is greater than this first default frequency value.
The control method of 24. 1 kinds of power supply units, comprises step:
Provide a supply convertor, in order to an input voltage is converted to an interior output voltage;
One output protection circuit is provided, is electrically connected between the output of this supply convertor and the output of this power supply unit, in order to protect this power supply unit that it is normally worked by the work of conducting or cut-off;
Detect this interior output voltage;
Detect an operating frequency of this supply convertor;
The relatively magnitude of voltage of this interior output voltage and one first default voltage value;
The relatively frequency values of this operating frequency and one first default frequency value;
The magnitude of voltage that the frequency values that judges this operating frequency of this supply convertor is greater than this first default frequency value and this interior output voltage is greater than one first default voltage value; And
When the magnitude of voltage that is greater than this first default frequency value and this interior output voltage when the frequency values of this operating frequency of this supply convertor is greater than this first default voltage value, control this output protection circuit cut-off.
The control method of 25. power supply units as claimed in claim 24, is characterized in that, detects this operating frequency system of this supply convertor by detecting a detection signal relevant to this operating frequency and exporting the feedback signal changing along with this operating frequency.
The control method of 26. power supply units as claimed in claim 25, is characterized in that, this detection signal is this interior output voltage.
The control method of 27. power supply units as claimed in claim 26, is characterized in that, this feedback signal is the error amplification signal of this interior output voltage through an error amplification procedure output.
The control method of 28. power supply units as claimed in claim 25, is characterized in that, this detection signal has the frequency corresponding with this operating frequency.
The control method of 29. power supply units as claimed in claim 28, is characterized in that, this feedback signal is the count signal of this detection signal through a counting step output.
The control method of 30. power supply units as claimed in claim 29, is characterized in that, this supply convertor is by this supply convertor work of a controller control, the output pulse signal that wherein this detection signal is this controller.
The control method of 31. power supply units as claimed in claim 25, is characterized in that, relatively the frequency values of this operating frequency and one first default frequency value are that relatively this feedback signal is reacted a default frequency value signal of this first default frequency value with one.
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| CN201010538320.4A CN102468760B (en) | 2010-11-01 | 2010-11-01 | Power supply device, control method thereof and power supply system using power supply device |
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| CN104135153B (en) * | 2014-07-22 | 2015-07-22 | 杨燕平 | DC-DC module power supply |
| CN109901975A (en) * | 2019-03-27 | 2019-06-18 | 英业达科技有限公司 | Power control unit and control method |
| CN112003455B (en) * | 2019-05-27 | 2022-04-29 | 台达电子工业股份有限公司 | Power supply and control method thereof |
| CN113098333B (en) * | 2021-04-01 | 2022-03-29 | 东风汽车集团股份有限公司 | Control method of air conditioner servo motor |
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|---|---|---|---|---|
| US6185082B1 (en) * | 1999-06-01 | 2001-02-06 | System General Corporation | Protection circuit for a boost power converter |
| US7385375B2 (en) * | 2005-02-23 | 2008-06-10 | Coldwatt, Inc. | Control circuit for a depletion mode switch and method of operating the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6185082B1 (en) * | 1999-06-01 | 2001-02-06 | System General Corporation | Protection circuit for a boost power converter |
| US7385375B2 (en) * | 2005-02-23 | 2008-06-10 | Coldwatt, Inc. | Control circuit for a depletion mode switch and method of operating the same |
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