CN101277065A - Switch power supply of inverse-excitation type self-excitation converting circuit RCC - Google Patents
Switch power supply of inverse-excitation type self-excitation converting circuit RCC Download PDFInfo
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- CN101277065A CN101277065A CNA2008100259218A CN200810025921A CN101277065A CN 101277065 A CN101277065 A CN 101277065A CN A2008100259218 A CNA2008100259218 A CN A2008100259218A CN 200810025921 A CN200810025921 A CN 200810025921A CN 101277065 A CN101277065 A CN 101277065A
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Abstract
The present invention discloses a switch power source of an inverse-excitation type self-excitation converting circuit which comprises an input rectification wave filtering circuit which is connected with an alternating current source. The input rectification wave filtering circuit is connected with a switch adjusting tube and a transformer. The transformer is connected with an output rectification wave filtering circuit. The switch adjusting tube is connected with a switch state controller. A switching tube clamp absorbing circuit is connected between the switch adjusting tube and the transformer. A switching tube acceleration switching circuit and a feedback forming circuit of the voltage stabilizing control signal are connected between the switch state controller and the transformer. The switching frequency of the switch power source according to the invention is unlike to the conventional switch power source and will not ascend to a high value in light load. The switching frequency will not keep to ascent when the load is reduced to a certain degree and an intermittent operation mode is switched to. The main switch frequency is fundamentally sustained to the frequency before the transition point. The switch power source has the advantages of reduced switching loss, increased efficiency of the electric power source, improved working condition of the switch adjusting tube and increased reliability of the electric power source.
Description
Technical field
The present invention relates to a kind of aperiodicity Switching Power Supply, be meant a kind of Switching Power Supply of inverse-excitation type self-excitation translation circuit RCC topological structure especially.
Background technology
Adopt the Switching Power Supply of inverse-excitation type self-excitation translation circuit RCC topological structure at present, more than the twice of the switching frequency when underload or the switching frequency when unloaded are full load, therefore, the switching loss of the switching loss when underload during than full load is big, efficient is very low, poor reliability.
China's ZL99804292.7 patent disclosure a kind of Switching Power Supply, this Switching Power Supply comprises the DC power supply that is used to provide the input power supply, be used for the direct current from described DC power supply is converted to alternating current, be used to detect the output voltage detecting circuit of the output voltage of described switching power unit, be used for the photoelectrical coupler that converts feedback signal from the error signal of described output voltage detecting circuit to, according to controlling the pulse-width modulation circuit that fat dashes from the feedback signal of described photoelectrical coupler, the changeable frequency oscillating circuit that is used to change frequency of oscillation and operating frequency is set to definite frequency, output transformer, be used to start first starting resistance of described switching power unit, the bearing power testing circuit, low-limit frequency is determined resistance and FREQUENCY CONTROL resistance.This scheme is by changing switching frequency, and the efficient when suppressing to hang down load reduces.
Summary of the invention
The technical problem that the present invention need solve provide a kind ofly reduce switching loss, reduce Switching Power Supply underload or the switching frequency when unloaded, the Switching Power Supply of efficient height, environmental protection, energy-conservation inverse-excitation type self-excitation translation circuit RCC.
For solving the problems of the technologies described above the technical solution used in the present invention be:
The Switching Power Supply of a kind of inverse-excitation type self-excitation translation circuit RCC, include the input rectifying filter circuit that connects with AC power, described input rectifying filter circuit connects with switch adjustment pipe and transformer, transformer connects with output rectifier and filter, described switch adjustment pipe connects with switch state controller, between switch adjustment pipe and transformer, be connected with the switching tube clamper and absorb circuit, between switch state controller and transformer, be connected with switching tube and quicken breaking circuit and voltage stabilizing control signal feedback formation circuit.
As preferred version of the present invention be: described switch state controller comprises triode Q2, resistance R 6, R7, R8, R9, capacitor C 4, C5, C6, voltage-stabiliser tube Z2, the collector electrode of triode Q2 connects with switch adjustment pipe, the base stage of Q2 connects with resistance R 6, R7, resistance R 7 connects with an end of capacitor C 5 and an end of resistance R 9, the other end of capacitor C 5 connects with transformer by capacitor C 4 and resistance R 8, and the other end of resistance R 9 connects by voltage-stabiliser tube Z2 also transformer.、
Described switching tube clamper absorbs circuit and comprises resistance R 2, diode D5, capacitor C 3, and after resistance R 2 and capacitor C 3 parallel connections, an end connects with transformer, and the other end connects with the negative electrode of diode D5, and the anode of diode D5 connects with switch adjustment pipe.
Described switching tube quickens breaking circuit and comprises capacitor C 7, and an end of capacitor C 7 connects with the tie point that the switching tube clamper absorbs circuit and switch adjustment pipe, and the other end of C7 connects with resistance R 6 in the switch state controller.
Described voltage stabilizing control signal feedback forms circuit and comprises voltage-stabiliser tube or photoelectrical coupler IC1, resistance R 11, R13, resistance R 15, R16, voltage-stabiliser tube Z3, diode D6, capacitor C 8, resistance R 11 is with after photosensitive tube among voltage-stabiliser tube or the photoelectrical coupler IC1 is connected in series, the end of R11 connects with resistance R 7 in the switch state controller, the other end of the photosensitive tube of voltage-stabiliser tube or photoelectrical coupler IC1 and resistance R 13, capacitor C 8 and transformer connect, the other end of resistance R 13, the other end of capacitor C 8 connects with ground, diode D6 is connected between the resistance R 8 and ground in the switch state controller, the diode of IC1 in the photoelectrical coupler, resistance R 15, R16, voltage-stabiliser tube Z3 is connected in the output rectifier and filter.
Switch described in the present invention is adjusted pipe and is made up of triode or field effect transistor.
Improvements over the prior art of the present invention have: 1, insert capacitor C 7 at switching tube and transformer tie point with the input of on off state control valve, the shutoff of acceleration switch pipe reduces turn-off power loss; 2, input at the on off state control valve inserts resistance R 6 and capacitor C 6, electric charge that electric capacity fills and then the time that bleeds off have prolonged because of the resistance that inserts, when underload or zero load, the voltage of output has trend of rising, feedback signal strengthens, the electric charge that electric capacity fills also just increases, electric charge can not in time bleed off, the on off state control valve can be in conducting state for some time all the time, switching tube does not have drive current, can not produce the higher-order of oscillation, have only feedback signal to be reduced to the threshold values of input of on off state control valve and just can form the higher-order of oscillation when following, therefore, switching tube can be operated in a kind of discontinuous operation pattern, what feedback control loop produced is the following low frequency intermittent oscillation of 1000Hz, and the main switch circuit generation is the above higher-order of oscillation of 20KHz; 3, on the winding of transformer and be connected to capacitor C 8, capacitor C 8 has double action, the height of capacitor C 8 both end voltage has reflected the height of output voltage, is the element as the output state detection feedback, simultaneously again as the electric capacity of the isolated DC of switching tube adjustment pipe forward drive current.
Compare with the Switching Power Supply of traditional employing RCC topological structure, because added the technology of quick on-off switching tube and underload or made feedback control loop produce the technology of low frequency intermittent oscillation when unloaded, switching frequency not can as the Switching Power Supply of traditional employing RCC topological structure in underloading the time rise very highly, frequency no longer raises but be reduced to a certain degree with load, change the discontinuous operation pattern over to, in discontinuous operation therebetween, the main switch frequency maintains that frequency before the breakover point substantially, switching loss has reduced, make the efficient of power supply be improved, switch tube working status is improved, and has improved the reliability of power supply.
Description of drawings
Fig. 1 is a functional-block diagram of the present invention;
Fig. 2 is the circuit theory diagrams of the embodiment of the invention one;
Fig. 3 is the circuit theory diagrams of the embodiment of the invention two
Fig. 4 is switching tube and transformer tie point E point and the ground wire A oscillogram of ordering of the present invention when 100% load is exported;
The oscillogram that switching tube that Fig. 5 is the present invention when 75% load output and transformer tie point E point and ground wire A are ordered;
The oscillogram that switching tube that Fig. 6 is the present invention when 50% load output and transformer tie point E point and ground wire A are ordered;
The oscillogram that switching tube that Fig. 7 is the present invention when 25% load output and transformer tie point E point and ground wire A are ordered;
Fig. 8 is switching tube and transformer tie point E point and the ground wire A oscillogram of ordering of the present invention when zero load;
Fig. 9 is the present invention's oscillogram that B point and ground wire A are ordered under the situation that has inserted resistance between the input B of on off state control valve Q2 point and the C point when 100% load is exported;
Figure 10 is the present invention's oscillogram that B point and ground wire A are ordered under the situation that does not insert resistance between the input B of on off state control valve Q2 point and the C point when 100% load is exported;
Figure 11 be the present invention when 100% load is exported between switching tube and transformer tie point E point and the ground wire A point and the input B point of on off state control valve Q2 and and ground wire A point between oscillogram.
Embodiment
For the ease of those skilled in the art's understanding, structural principle of the present invention is described in further detail below in conjunction with specific embodiment and accompanying drawing:
Referring to shown in Figure 1, the Switching Power Supply of a kind of inverse-excitation type self-excitation translation circuit RCC, include the input rectifying filter circuit that connects with AC power, start-up circuit, switch adjustment pipe, the switching tube clamper absorbs circuit, switch state controller, switching tube quickens breaking circuit, transformer, the feedback of voltage stabilizing control signal forms circuit, output rectifier and filter, described input rectifying filter circuit connects with switch adjustment pipe and transformer, transformer connects with output rectifier and filter, described switch adjustment pipe connects with switch state controller, between switch adjustment pipe and transformer, be connected with the switching tube clamper and absorb circuit, between switch state controller and transformer, be connected with switching tube and quicken breaking circuit and voltage stabilizing control signal feedback formation circuit.
As shown in Figure 2, Switching Power Supply embodiment one circuit theory diagrams of inverse-excitation type self-excitation translation circuit RCC of the present invention, input rectifying filter circuit are by protective tube FUSE, diode D1, D2, D3, D4, capacitor C 1, C2, inductance L 1, resistance R 1 composition such as grade; Start-up circuit is made up of resistance R 3, R4, R5; Switch is adjusted pipe and is made up of triode or field effect transistor Q1, switch adjustment pipe Q1 be provided with tie point E point between transformer T1 connects; The switching tube clamper absorbs circuit and is made up of resistance R 2, diode D5, capacitor C 3; Switch state controller is made up of triode Q2, resistance R 6, R7, R8, R9, capacitor C 4, C5, C6, voltage-stabiliser tube Z2, and the input of triode Q2 has tie point B, C point, and the collector electrode of Q2 is provided with tie point D point, and the emitter of Q2 is provided with tie point A point; Current foldback circuit is made up of resistance R 10, R12; The feedback of voltage stabilizing control signal forms route voltage-stabiliser tube Z1, resistance R 11, R13 in the electricity, and diode D6, capacitor C 8 are formed; Output rectifier and filter is made up of diode D7, capacitor C 9, resistance R 14; Transformer T1 comprises elementary winding N2, feedback winding N5, secondary winding N4, shielding winding N1, N3.
As shown in Figure 3, be the embodiment of the invention two circuit theory diagrams, with implement a different place and be, the feedback of described voltage stabilizing control signal forms circuit to be made up of photoelectrical coupler IC1, resistance R 11, R13, R15, R16, voltage-stabiliser tube Z3, diode D6, capacitor C 8, and photoelectrical coupler IC1 can adopt the PC817 model.Resistance R 11 is with after photosensitive tube emitter among the photoelectrical coupler IC1 is connected in series, the end of R11 connects with resistance R 7 in the switch state controller, the collector electrode of the photosensitive tube of photoelectrical coupler IC1 and resistance R 13, capacitor C 8 and transformer connect, the other end of resistance R 13, the other end of capacitor C 8 connects with ground, diode D6 is connected between the resistance R 8 and ground in the switch state controller, the diode of IC1 in the photoelectrical coupler, resistance R 15, R16, voltage-stabiliser tube Z3 forms the output error voltage testing circuit, resistance R 15, the diode of IC1 in the photoelectrical coupler, voltage-stabiliser tube Z3 is series between the end of capacitance cathode in the output rectifier and filter and resistance R 14, and resistance R 16 is parallel between the diode of IC1 in the photoelectrical coupler.
Raise the efficiency in order to reach, purpose of energy saving, embodiment and operation principle of the present invention are: 1. insert capacitor C 7 between the input C point of switch adjustment pipe Q1 and transformer T1 tie point E point and triode Q2, when switching tube will by conducting transfer to by the time, when the voltage that switching tube and transformer tie point E are ordered is on the rise, because of the voltage on the capacitor C 7 can not suddenly change, the input terminal voltage of on off state control valve Q2 is also with regard to fast rise, on off state control valve Q2 enters saturation condition fast, switching tube Q1 can be turn-offed fast, reduced turn-off power loss; 2. insert resistance R 6 at the input B of triode Q2 point and C point, between C point and ground wire A point, insert capacitor C 6, feedback winding N5 one end of transformer T1 is received the D point by the resistance R 8 and the capacitor C 4 of series connection, for switching tube Q1 provides drive current and positive feedback, this end of feedback winding N5 of transformer T1 is also received ground wire A point by diode D6 simultaneously, the anode of another termination capacitor C 8 of the feedback winding N5 of transformer T1, the negative terminal of capacitor C 8 is received ground wire A point.Capacitor C 8 has double action, the height of capacitor C 8 both end voltage has reflected the height of output voltage, be the element as the output state detection feedback, simultaneously again as the electric capacity of the isolated DC of switching tube Q1 forward drive current, capacitor C 8 will flow through high-frequency ac current.The velocity of discharge of capacitor C 8 two ends parallel resistor control capacitances, the anode of capacitor C 8 is by the voltage-stabiliser tube Z1 and the current-limiting resistance R11 C point that is connected on off state control valve Q2 of series connection, when the rising of capacitor C 8 both end voltage surpasses the puncture voltage of voltage-stabiliser tube Z1, to capacitor C 6 quick charges, because capacitor C 6 discharges mainly are to be finished by resistance R 6 and on off state control valve Q2, the access of resistance R 6, make that the velocity of discharge is slowed down, if also be higher than the threshold voltage of on off state control valve Q2 at the voltage of the moment capacitor C 6 that the transformer energy stored runs out of, then on off state control valve Q2 can be in conducting state for some time all the time, switching tube does not have drive current, can not produce the higher-order of oscillation, have only when capacitor C 8 both end voltage are reduced to the threshold voltage of on off state control valve Q2 just can form the higher-order of oscillation when following.
This principle can be from Fig. 9, Figure 10, Figure 11 analyzes out, Fig. 8 is 100% load when output oscillogram of ordering of B point and ground wire A under the situation that has inserted resistance between the input B of on off state control valve Q2 point and the C point, Fig. 9 is 100% load when output oscillogram of ordering of B point and ground wire A under the situation that does not insert resistance between the input B of on off state control valve Q2 point and the C point, when Figure 10 is 100% load output, oscillogram between switching tube and transformer tie point E point and the ground wire A point and the input B point of on off state control valve Q2 and and ground wire A point between oscillogram, as can be seen, under full load output situation, when the transformer energy stored runs out of the E point voltage and begins to descend, the B point is recharged, voltage can rise, in the switching tube conducting, discharge again, voltage has descended, do not reach the conducting valve threshold voltage of on off state control valve Q2, on off state control valve Q2 is operated in the HF switch state, when load is fallen little to a certain degree the time, capacitor C 8 both end voltage can rise, capacitor C 6 charging currents are increased, when the transformer energy stored runs out of when will begin next cycle, the electric charge that C6 stores can not have been released, the B point voltage rises, make on off state control valve Q2 be in conducting state, switching tube does not have drive current, can not produce the higher-order of oscillation, therefore, switching tube can be operated in a kind of discontinuous operation pattern, what feedback control loop produced is the following low-frequency oscillation of 1000Hz, and the main switch circuit generation is the above higher-order of oscillation of 20KHz.The out-of-work time of switching tube is relevant with capacitor C 8 velocities of discharge with capacitor C 6, substantially be not subjected to the influence of load variations, and the time of switching tube Q1 work reducing and reduce with load, during to the complete zero load of output, a switching tube HF switch just quits work several times, from Fig. 4, Fig. 5, Fig. 6, Fig. 7, Fig. 8 different operating state of switching tube as can be seen.
This discontinuous operation pattern makes the loss of power supply when underload or zero load reduce, and has improved efficient.Compare with the Switching Power Supply of traditional employing RCC topological structure, because the pattern that has added the technology and the underload of quick on-off switching tube or knocked off idle time and do, switching frequency can not rise very highly during in underloading as original, but be reduced to the discontinuous operation pattern that to a certain degree just changes over to load, in discontinuous operation therebetween, switching frequency maintains that frequency before the breakover point substantially, switching loss has reduced, make the efficient of power supply be improved, switch tube working status is improved, and has improved the reliability of power supply.
Claims (6)
1, the Switching Power Supply of a kind of inverse-excitation type self-excitation translation circuit RCC, include the input rectifying filter circuit that connects with AC power, described input rectifying filter circuit connects with switch adjustment pipe and transformer, transformer connects with output rectifier and filter, it is characterized in that: described switch adjustment pipe connects with switch state controller, is connected with switching tube and quickens breaking circuit and voltage stabilizing control signal feedback formation circuit between switch state controller and transformer.
2, the Switching Power Supply of inverse-excitation type self-excitation translation circuit RCC according to claim 1, it is characterized in that: described switch state controller comprises triode Q2, resistance R 6, R7, R8, R9, capacitor C 4, C5, C6, voltage-stabiliser tube Z2, the collector electrode of triode Q2 connects with switch adjustment pipe, the base stage of Q2 connects with resistance R 6, R7, resistance R 7 connects with an end of capacitor C 5 and an end of resistance R 9, the other end of capacitor C 5 connects with transformer by capacitor C 4 and resistance R 8, and the other end of resistance R 9 connects with transformer by voltage-stabiliser tube Z2.
3, the Switching Power Supply of inverse-excitation type self-excitation translation circuit RCC according to claim 2 is characterized in that: described switch is adjusted pipe and is made up of triode or field effect transistor.
4, according to the Switching Power Supply of claim 2 or 3 described inverse-excitation type self-excitation translation circuit RCC, it is characterized in that: described switching tube quickens breaking circuit and comprises capacitor C 7, one end of capacitor C 7 connects with switch adjustment pipe, and the other end of C7 connects with resistance R 6 in the switch state controller.
5, the Switching Power Supply of inverse-excitation type self-excitation translation circuit RCC according to claim 4, it is characterized in that: described voltage stabilizing control signal feedback forms circuit and comprises voltage-stabiliser tube Z1, resistance R 11, R13, diode D6, capacitor C 8, resistance R 11 is with after voltage-stabiliser tube Z1 is connected in series, the end of R11 connects with resistance R 7 in the switch state controller, the other end of Z1 connects with resistance R 13, capacitor C 8 and transformer, the other end of the other end of resistance R 13, capacitor C 8 connects with ground, and diode D6 is connected between the resistance R 8 and ground in the switch state controller.
6, the Switching Power Supply of inverse-excitation type self-excitation translation circuit RCC according to claim 4, it is characterized in that: described voltage stabilizing control signal feedback forms circuit and comprises photoelectrical coupler IC1, resistance R 11, R13, resistance R 15, R16, voltage-stabiliser tube Z3, diode D6, capacitor C 8, after the emitter of the photosensitive tube among resistance R 11 and the photoelectrical coupler IC1 is connected in series, the end of R11 connects with resistance R 7 in the switch state controller, the collector electrode of the photosensitive tube of photoelectrical coupler IC1 and resistance R 13, capacitor C 8 and transformer connect, the other end of resistance R 13, the other end of capacitor C 8 connects with ground, diode D6 is connected between the resistance R 8 and ground in the switch state controller, the diode of IC1 in the photoelectrical coupler, resistance R 15, R16, voltage-stabiliser tube Z3 is connected in the output rectifier and filter.
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| CN 200810025921 CN101277065B (en) | 2008-01-18 | 2008-01-18 | Switch power supply of inverse-excitation type self-excitation converting circuit RCC |
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