CN107863876B - Converter for converting constant current into constant voltage and device for converting constant current into constant voltage - Google Patents
Converter for converting constant current into constant voltage and device for converting constant current into constant voltage Download PDFInfo
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- CN107863876B CN107863876B CN201711123660.9A CN201711123660A CN107863876B CN 107863876 B CN107863876 B CN 107863876B CN 201711123660 A CN201711123660 A CN 201711123660A CN 107863876 B CN107863876 B CN 107863876B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
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Abstract
The invention discloses a constant current-to-constant voltage converter and a constant current-to-constant voltage device, wherein the constant current-to-constant voltage converter is provided with an incoming line and an outgoing line and is connected with an actual load L when in use, and the constant current-to-constant voltage converter is characterized by comprising a first switching part, a second switching part, an inductor I1, a capacitor C1 and a capacitor C2, wherein the first switching part comprises a switching part S1 and/or a switching part S3, and the second switching part comprises a switching part S2 and/or a switching part S4; when the converter is used, the output voltage of the constant current-to-constant voltage converter is kept constant by adjusting the duty ratio of the first switching part; when the first switch portion is turned on, the second switch portion is in an off state, and when the first switch portion is turned off, the second switch portion is in an on state. The invention adopts the switch part to switch current, and adjusts the voltage at two ends of the duty ratio load of the switch part, thereby having high conversion efficiency, simultaneously reducing the volume and the weight, and greatly saving the cost of the product and the application product.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a constant-current-to-constant-voltage converter and a constant-current-to-constant-voltage device.
Background
In the application of single-line constant current source power supply, constant current to constant voltage converters are needed, fig. 15-a, fig. 15-B and fig. 15-C respectively show an example of application of a single-line constant current source in the prior art, wherein fig. 15-a shows a case of double-end power supply of the single-line constant current source, fig. 15-B and fig. 15-C respectively show a case of single-end power supply of the single-line constant current source, S + in the figure represents a positive constant current source, S-represents a negative constant current source, N1, N2, N3, …, Nn-1 and Nn all represent constant current to constant voltage converters, the constant current to constant voltage converters can be connected with loads, and each constant current to constant voltage converter has an incoming line and an outgoing line; in fig. 15-a, an incoming line of the constant current to constant voltage converter N1 is connected to a positive polarity constant current source, an incoming line of the constant current to constant voltage converter N2 is connected to an outgoing line of the constant current to constant voltage converter N1, an incoming line of the constant current to constant voltage converter N3 is connected to an outgoing line of the constant current to constant voltage converter N2, an incoming line of the constant current to constant voltage converter Nn is connected to an outgoing line of the constant current to constant voltage converter Nn-1, and an outgoing line of the constant current to constant voltage converter Nn is connected to a negative polarity constant current source; in fig. 15-B, the line-in line of the constant current to constant voltage converter N1 is connected to the positive constant current source, the line-in line of the constant current to constant voltage converter N2 is connected to the line-out line of the constant current to constant voltage converter N1, the line-in line of the constant current to constant voltage converter N3 is connected to the line-out line of the constant current to constant voltage converter N2, the line-in line of the constant current to constant voltage converter Nn is connected to the line-out line of the constant current to constant voltage converter Nn-1, and the line-out line of the constant current to constant voltage converter Nn; in fig. 15-C, the line-in line of the constant current to constant voltage converter N1 is connected to the ground line, the line-in line of the constant current to constant voltage converter N2 is connected to the line-out line of the constant current to constant voltage converter N1, the line-in line of the constant current to constant voltage converter N3 is connected to the line-out line of the constant current to constant voltage converter N2, the line-in line of the constant current to constant voltage converter Nn is connected to the line-out line of the constant current to constant voltage converter Nn-1, and the line-out line of the constant current to constant voltage converter Nn is connected; each constant current-to-constant voltage converter is connected in series with a single-wire constant current source and a grounding wire through a respective incoming line and an outgoing line to form a whole system; when only one constant current to constant voltage converter is provided, that is, only N1 exists in fig. 15-a, 15-B and 15-C, in fig. 15-a, the line outgoing line of the constant current to constant voltage converter N1 is directly connected to the negative constant current source, in fig. 15-B, the line outgoing line of the constant current to constant voltage converter N1 is directly connected to the ground line, in fig. 15-C, the line outgoing line of the constant current to constant voltage converter N1 is directly connected to the negative constant current source; in the prior art, a voltage stabilizing tube or a dummy load device is generally adopted as an energy consumption load for converting a constant current into a constant voltage, so that the sum of the energy consumption load of a constant current-to-constant voltage (CC/CV) converter and the power of an actual load connected with an output end of the CC/CV converter is kept constant. Fig. 14-a, 14-B, and 14-C respectively show application diagrams of prior art using a voltage regulator as an energy consumption load, as shown in fig. 14-a, a voltage regulator is connected in series in an output loop of a constant current source for converting a current source into a voltage source to be supplied to a load, as shown in fig. 14-B, when a load current is larger than an output current of the constant current source, a matching converter is required to be added for matching the load, as shown in fig. 14-C, when an input end and an output end of the constant current source need to be isolated, a zener diode is generally placed at a side of the load for convenience of heat dissipation, an active load may be used instead of the voltage regulator to ensure stability of the input voltage, as shown in fig. 14-D, by adjusting the size of the energy consumption load, when the actual load changes, the constant output voltage is ensured to be constant by adjusting the energy consumption of the energy consumption load, so that the constant current source is directly changed into a constant voltage source; similar circuits have some variations, but in this type of circuit, energy consuming loads are necessary, because the load in general applications is a constant voltage source load, which is characterized by an increase in the equivalent resistance of the load as the load decreases, while the load is reduced under the condition of a constant current source, the equivalent resistance of the load is also reduced, and the design ideas of common constant current-to-constant voltage converters, such as BUCK type (BUCK), boost type (boost), boost-BUCK type (BUCK-boost), flyback type (flyback-back), full bridge type, half bridge type, push-pull type and the like, are adopted, if no energy consumption load exists, the input of the power supply is a constant current source, the output of the power supply is also a constant current source, the power supply can not adapt to a constant voltage source load, but the application of the energy consumption load ensures that the efficiency of the power supply is very low when the actual load is very small, this is because the sum of the efficiency of the energy consuming load and the efficiency of the actual load is the maximum power of the power supply.
Disclosure of Invention
In order to solve the technical problem, the invention provides a constant current to constant voltage converter and a constant current to constant voltage device, which can make redundant electric energy stay in an energy storage module while meeting the load energy requirement by controlling the pulse width of current flowing to a load and matching a capacitor element and an inductor element, and can ensure that the average current on the inductor element is always equal to the current input into a constant current source, thereby ensuring the normal operation of the constant current source.
The technical scheme of the invention is as follows:
a constant current to constant voltage converter is provided with an incoming line and an outgoing line, and is connected with an actual load L when in use, and is characterized by comprising a first switching part, a second switching part, an inductor I1, a capacitor C1 and a capacitor C2, wherein the first switching part comprises a switching component S1 and/or a switching component S3, and the second switching part comprises a switching component S2 and/or a switching component S4;
the first switch end of the switch component S1 is connected to an incoming line, and the second switch end is connected to the first switch end of the switch component S2; a second switch terminal of the switch element S2 is connected to one terminal of the actual load L; a first switch terminal of the switch element S3 is connected to the outlet line, and a second switch terminal is connected to the first switch terminal of the switch element S4; a second switch end of the switch member S4 is connected to the other end of the actual load L;
the capacitor C1 is connected with the first switch end of the switch component S1 and the outgoing line, or the first switch end of the switch component S3 and the incoming line;
the inductor I1 is connected between the second switch end of the switch component S1 and the outgoing line, or between the second switch end of the switch component S3 and the incoming line;
the capacitor C2 is connected with the second switch end of the switch component S2 and the outlet line, or the second switch end of the switch component S4 and the inlet line;
when the converter is used, the output voltage of the constant current-to-constant voltage converter is kept constant by adjusting the duty ratio of the first switching part; when the first switch portion is turned on, the second switch portion is in an off state, and when the first switch portion is turned off, the second switch portion is in an on state.
Further, the inductor I1 is a double-winding inductor.
Further, the constant current to constant voltage converter further includes:
a controller C for adjusting the duty ratio of the first switching part;
a driving module D1 disposed between the controller C and the control terminal of the first switching section, a driving module D2 disposed between the controller C and the control terminal of the second switching section;
the driving module D1 is configured to output a driving signal for controlling the first switching unit to turn on or off according to the duty ratio adjustment signal output by the controller C; the driving module D2 is configured to output a driving signal for controlling the second switching unit to turn on or off according to the duty ratio adjustment signal output by the controller C.
Further, the second switch part is a controllable switch or an uncontrollable switch.
Further, the constant current to constant voltage converter further includes:
the voltage detection module M is connected with the controller C and used for detecting the output voltage of the constant current-to-constant voltage converter; the controller C generates a duty ratio adjusting signal of the first switching part according to the output voltage given value and the output voltage feedback value detected by the voltage detection module M.
Further, the constant current to constant voltage converter further includes:
the input end of the filter F1 is connected with an incoming line and an outgoing line, and the output end of the filter F1 is connected with the capacitor C1 in parallel.
Further, the constant current to constant voltage converter further includes:
a filter F2; the input end of the filter F2 is connected in parallel with the capacitor C2, and the output end of the filter F2 is connected in parallel with the two ends of the actual load L.
A constant current to constant voltage device comprises at least two constant current to constant voltage converters.
Further, the input ends of the constant current to constant voltage converters of the constant current to constant voltage device are connected in series, and the output ends are connected in series.
Further, the input ends of the constant current to constant voltage converters of the constant current to constant voltage device are connected in series and the output ends are connected in parallel.
The constant current to constant voltage converter and the constant current to constant voltage device provided by the invention adopt the first switch part and the second switch part to switch current, control the voltage of a capacitor C1 in a single switch period by adjusting the turn-off time of the first switch part so as to control the energy stored on a capacitor C1, and the turn-off time of the first switch part is in direct proportion to the voltage of a capacitor C1 so as to further control the energy stored on an inductor I1 in the single switch period and further control the voltage of the capacitor C2 and two ends of a load. The constant-current to constant-voltage converter has high efficiency, reduces the volume and the weight, and greatly saves the cost of the product and the application product.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural view of a constant current to constant voltage converter according to embodiment 1 of the present invention;
fig. 2 is a schematic structural view of a constant current to constant voltage converter according to embodiment 2 of the present invention;
fig. 3 is a schematic structural view of a constant current to constant voltage converter according to embodiment 3 of the present invention;
fig. 4 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 4 of the present invention;
fig. 5 is a schematic structural view of a constant current to constant voltage converter according to embodiment 5 of the present invention;
fig. 6 is a schematic structural view of a constant current to constant voltage converter according to embodiment 6 of the present invention;
fig. 7 is a schematic structural view of a constant current to constant voltage converter according to embodiment 7 of the present invention;
fig. 8 is a schematic structural view of a constant current to constant voltage converter according to embodiment 8 of the present invention;
fig. 9 is a schematic structural view of a constant current to constant voltage converter according to embodiment 9 of the present invention;
fig. 10 is a schematic structural view of a constant current to constant voltage converter according to embodiment 10 of the present invention;
fig. 11 is a schematic structural view of a constant current to constant voltage converter according to embodiment 11 of the present invention;
fig. 12 is a schematic structural view of a constant current to constant voltage apparatus according to embodiment 12 of the present invention;
fig. 13 is a schematic structural view of a constant current to constant voltage apparatus according to embodiment 13 of the present invention;
14-A, 14-B, 14-C, and 14-D are schematic diagrams of prior art applications using a voltage regulator tube as an energy consuming load;
fig. 15-a, 15-B, and 15-C are diagrams illustrating examples of application of a single-line constant current source in the related art, respectively.
In the figure: 1. incoming line, 2, outgoing line, 3, first switch terminal of switch block S1, 4, second switch terminal of switch block S1, 5, control terminal of switch block S1, 6, first switch terminal of switch block S2, 7, second switch terminal of switch block S2, 8, control terminal of switch block S2, 9, first switch terminal of switch block S3, 10, second switch terminal of switch block S3, 11, control terminal of switch block S3, 12, first switch terminal of switch block S4, 13, second switch terminal of switch block S4, 14, control terminal of switch block S4.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes the technical solutions of the embodiments of the present invention clearly and completely with reference to the accompanying drawings in the embodiments of the present invention:
fig. 1 is a schematic structural view of a constant current to constant voltage converter according to embodiment 1 of the present invention, such as the one shown in fig. 1, which has an incoming line and an outgoing line and is connected to an actual load L in use, and which includes a switching element S1; the first switch end of the switch component S1 is connected with an incoming line and one end of the energy storage capacitor C1, and the second switch end of the switch component S1 is connected with one end of the energy storage inductor and one end of the switch component. The voltage of the capacitor C1 in a single switching period is controlled by adjusting the duty ratio or the conduction time of the switching component S1 so as to control the energy stored in the capacitor C1, control the energy stored in the inductor I1 in a single switching period, and further control the voltage of the capacitor C2 and the voltage of the two ends of the load. The constant current to constant voltage converter can also comprise a switching component S2 which is connected between the energy storage inductor I1 and the capacitor C2 in series; the switch component S2 is connected to the controller C via the drive module D; controlling the switch component S2 to be in an on state or an off state by the controller C, the switch component S2 being in an off state when the switch component S1 is on, the switch component S2 being in an on state when the switch component S1 is off, thus ensuring unidirectional conduction of S2;
a constant current to constant voltage converter is provided with an incoming line and an outgoing line, and is connected with an actual load L when in use, and is characterized by comprising a first switching part, a second switching part, an inductor I1, a capacitor C1 and a capacitor C2, wherein the first switching part comprises a switching component S1 and/or a switching component S3, and the second switching part comprises a switching component S2 and/or a switching component S4; the first switch end of the switch component S1 is connected to an incoming line, and the second switch end is connected to the first switch end of the switch component S2; a second switch terminal of the switch element S2 is connected to one terminal of the actual load L; a first switch terminal of the switch element S3 is connected to the outlet line, and a second switch terminal is connected to the first switch terminal of the switch element S4; a second switch end of the switch member S4 is connected to the other end of the actual load L; the capacitor C1 is connected with the first switch end of the switch component S1 and the outgoing line, or the first switch end of the switch component S3 and the incoming line; the inductor I1 is connected between the second switch end of the switch component S1 and the outgoing line, or between the second switch end of the switch component S3 and the incoming line; the capacitor C2 is connected with the second switch end of the switch component S2 and the outlet line, or the second switch end of the switch component S4 and the inlet line; when the converter is used, the output voltage of the constant current-to-constant voltage converter is kept constant by adjusting the duty ratio of the first switching part; when the first switch part is switched on, the second switch part is in a switch-off state, and when the first switch part is switched off, the second switch part is in a switch-on state, so that the one-way conduction of the second switch part is ensured. In fact, the switch component S1 functions in the same way as S3, and the switch component S3 or S1 can be used alone, although S1 and S3 can also exist at the same time; similarly, the switch component S2 functions similarly to S4, and the switch component S4 or S2 can be used independently, although S2 and S4 can exist simultaneously. The first switch end of the switch component S1 is connected with the incoming line and one end of the energy storage capacitor C1, and the second switch end of the switch component S1 is connected with one end of the energy storage inductor and one end of the switch component. The voltage of the capacitor C1 in a single switching period is controlled by adjusting the duty ratio or the conduction time of the switching component S1 so as to control the energy stored in the capacitor C1, control the energy stored in the inductor I1 in a single switching period, and further control the voltage of the capacitor C2 and the voltage of the two ends of the load.
Fig. 2 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 2 of the present invention, which is obtained by adding an actual control circuit to embodiment 1 (in the case that the first switch section only includes the switch element S1, and the second switch section only includes the switch element S2), and as shown in fig. 2, the constant current to constant voltage converter may further include: a controller C for adjusting the duty cycle of the switching component S1; a driving module D1 interposed between the controller C and a control terminal of the switching part S1; a driving module D2 interposed between the controller C and a control terminal of the switching part S2; the driving module D1 is configured to output a driving signal for controlling the switching component S1 to be turned on and off according to the duty ratio adjusting signal output by the controller C, and drive the switching component S2 to be turned on and off through the driving module D2 under the control of the controller C, so that the switching component S2 is in an off state when the switching component S1 is turned on, and the switching component S2 is in an on state when the switching component S1 is turned off, so as to ensure unidirectional turning on of the switching component S2.
Fig. 3 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 3 of the present invention, which is a further preferred embodiment based on embodiment 2, and as shown in fig. 3, the constant current to constant voltage converter may further include a voltage detection module M connected to the controller C and configured to detect an output voltage of the constant current to constant voltage converter; the controller C generates a duty ratio adjustment signal of the switching part S1 according to the output voltage set value and the output voltage feedback value detected by the voltage detection module M.
Fig. 4 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 4 of the present invention, which is a further preferred embodiment based on embodiment 3, and as shown in fig. 4, the constant current to constant voltage converter may further include a filter F1; the input end of the filter F1 is connected with an incoming line and an outgoing line; the output end of the filter F1 is connected in parallel with the energy storage capacitor C1. The filter is used for filtering out ripple signals at two ends of the energy storage capacitor C1 so that the current and the voltage at the input end of the constant-current to constant-voltage converter are kept constant in a steady state.
Fig. 5 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 5 of the present invention, which is a further preferred embodiment based on embodiment 4, and as shown in fig. 5, the constant current to constant voltage converter may further include a filter F2; the input end of the filter F2 is connected with a capacitor C2 in parallel; the output of the filter F2 is connected in parallel across the actual load L.
Fig. 6 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 6 of the present invention, which is one of embodiments 5, and as shown in fig. 6, the constant current to constant voltage converter may use a unidirectional switching diode as a switching element S2.
Fig. 7 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 7 of the present invention, which is a further preferred embodiment based on embodiment 5, and as shown in fig. 7, the constant current to constant voltage converter adopts a switching element S3 connected in series at one end of an outlet line instead of the switching element S1; the switch part S3 is connected to the controller C via the driving module D1; the switching member S3 is controlled by the controller C to be in an on state or an off state, the switching member S2 is in an off state when the switching member S3 is turned on, and the switching member S2 is in an on state when the switching member S3 is turned off. Of course, S1 and S3 may also be present at the same time, which is not identified in the figure.
Fig. 8 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 8 of the present invention, which is a specific further embodiment based on embodiment 7, and as shown in fig. 8, the constant current to constant voltage converter may further use a diode as a switching element S2.
Fig. 9 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 9 of the present invention, which is a further preferred embodiment based on embodiment 7, and as shown in fig. 9, the constant current to constant voltage converter may further include a switching element S4 connected in series to one end of the outgoing line; in fact, S2 is replaced by S4, although S4 and S2 may also be present simultaneously, which is not shown in the figure.
Fig. 10 is a schematic structural diagram of a constant current to constant voltage converter according to embodiment 10 of the present invention, which is a further preferred embodiment based on embodiment 9, and as shown in fig. 8, the constant current to constant voltage converter may further use a diode as a switching element S4.
Fig. 7, 8, 9 and 10 are schematic structural diagrams of constant current to constant voltage converters according to embodiments 7, 8, 9 and 10 of the present invention, which are further evolved on the basis of embodiments 2, 3, 4, 5 and 6, and as shown in fig. 7, 8, 9 and 10, the constant current to constant voltage converters may further include a switch component S3 and a switch component S4; the switch component S1 and the switch component S3 may be present at the same time or only one of them (at the positions in the figure), and the switch component S2 and the switch component S4 may be present at the same time or only one of them (at the positions in the figure); the switching elements S1, S3 must be controllable switches, either unidirectional or bidirectional, and function identically no matter what type of switch they are, in fact, the switching elements S1 and S3 function identically and are identical in principle. When the switching element S1 and the switching element S3 exist at the same time, the time of their simultaneous conduction coincides with the conduction time when only one of them exists; the switching component S2 and the switching component S4 may be controllable switches or uncontrollable switches (such as diodes), the functions of the switching component S2 and the switching component S4 are completely the same, and are equivalent in principle, when the switching component S2 and the switching component S3 adopt bidirectional controllable switches, unidirectional conduction needs to be ensured; when the switching component S2 and the switching component S4 are controllable switches at the same time, and the switching component S2 and the switching component S4 are present at the same time, the time for which they are simultaneously turned on coincides with the time for which they are turned on when only one of them is present; and the switching components S2 and (or) S4 are in an off state when the switching components S1 and (or) S3 are turned on, and the switching components S2 and (or) S4 are in an on state when the switching components S1 and (or) S3 are turned off. The switching component S1, the switching component S2, the switching device S3 and the switching device S4 may be single switching devices, or may be a switching structure formed by connecting a plurality of switching devices in series and parallel, and the switching device S1, the switching device S2 and the switching device S3 may further include circuit networks added to improve switching characteristics, such as circuit networks formed by resistors, capacitors, inductors, diodes, and the like.
FIG. 11 is a schematic diagram showing the structure of a constant current-to-constant voltage converter according to embodiment 11 of the present invention, which is described in embodiment 1, embodiment 2, embodiment 3, embodiment 4, embodiment 5, embodiment 6, embodiment 7,
In example 8, example 9 and example 10, as shown in fig. 11, the constant current to constant voltage converter may further replace the energy storage inductor I2 in examples 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 with a dual winding inductor, the inductor stores energy through the first winding 9 and releases energy through the second winding 10, when S1(S1 is not shown in the figure) or S3 is turned on, the energy stored in the capacitor C1 is converted to the inductor I2, and then the second winding 10 cannot flow current due to turn-off of S2 or S4 (S4 is not shown in the figure); when S1(S1 is not shown) or S3 is turned off, the energy stored in the inductor I2 is transferred to the capacitor C2 through the second winding 10, and no current can flow through the first winding 9 because S1 or S3 is turned off (S4 is not shown); the mode can realize the isolation of the input and the output of the constant current-to-constant voltage device.
Fig. 12 is a schematic structural diagram of a device for converting constant current to constant voltage according to embodiment 12 of the present invention, and the device for converting constant current to constant voltage shown in fig. 12 includes at least two converters for converting constant current to constant voltage; furthermore, the input ends of the constant current to constant voltage converters are connected in series, and the output ends of the constant current to constant voltage converters are connected in series; wherein, A1, A2 and … An are constant current-to-constant voltage converters.
Fig. 13 is a schematic structural diagram of a device for converting constant current to constant voltage according to embodiment 13 of the present invention, and the device for converting constant current to constant voltage shown in fig. 13 includes at least two converters for converting constant current to constant voltage; furthermore, the input ends of the constant current to constant voltage converters are connected in series, and the output ends of the constant current to constant voltage converters are connected in parallel; wherein, A1, A2 and … An are constant current-to-constant voltage converters.
Alternatively, the embodiment 12 of the present invention and the embodiment 13 of the present invention may be combined to form a new embodiment, for example, the circuit formed in the embodiment 12 is used as one group, and a plurality of groups of the inputs of each group are connected in series and the outputs of each group are connected in parallel to form a new embodiment as in the embodiment 13; similarly, the circuit of example 13 is set as one set, and a plurality of sets of the circuit of example 12 are connected in series with the inputs of each set and the outputs of each set are also connected in series to form a new example.
The filtering component F1 and the filtering component F2 can be a filtering network composed of passive devices such as inductors and capacitors, or an active filtering network, or a filtering network composed of the passive devices and the active devices; the input and output terminals of the filtering components F1 and F2 are only for convenience of describing the functions of the filtering components, and do not represent the current and energy flow directions; the filtering part F1 is used for filtering voltage and current fluctuation generated by the continuous on and off of the switch part S1, when the actual load L is not changed, the input end of the filtering part F1 is kept relatively stable, when the actual load L is changed, the input end of the filtering part F1 is slowly changed, so that other constant current-to-constant voltage converters sharing a constant current source with the constant current-to-constant voltage converter and the constant current source can keep relatively stable potential; in practical application, the filtering component F1 may be a high-order filter, and specifically, which kind of filter is adopted according to the practical application needs; the filter component F2 converts the pulsating current at its input terminal into a stable voltage; the filtering component F2 may be a high-order filter, or a filtering network composed of a capacitor, an inductor, a resistor, a switch and a transformer;
the controller C generates a duty ratio adjusting signal of the switching component S1 according to the error between the output voltage given value and the output voltage feedback value detected by the voltage detection module M; the higher the duty ratio or on-time of the switching element S1 or (and) S3, the lower the output voltage of the constant current to constant voltage converter, and the lower the duty ratio or on-time of the switching element S1 or (and) S3, the higher the output voltage of the constant current to constant voltage converter.
The actual load L can be a resistive load, a capacitive load, an inductive load, an active load, a passive load and the like, and can also be any combination load of the resistive load, the capacitive load and the inductive load, and the actual load L can also be provided with a load matching circuit; the actual load L may also have various converters to match the voltage supplied to the load and to the load, since in a constant current source supply circuit, in order to match the input voltage of the constant current to constant voltage converter to the load power, a voltage matching circuit is generally required, which may be any converter, such as a DC/DC converter, a DC/AC converter, an AC/DC converter or an AC/AC converter; the actual load L can also be provided with an electric isolation circuit which is used for isolating the constant-current-to-constant-voltage converter from the load; the actual load L may also include a transformer, a piezoelectric transformer, and other circuits, and supplies power to the final load after conversion, so the actual load L herein refers to the load in the above-mentioned broad sense; the controller C may adopt various known circuits such as an analog circuit, a digital circuit, a combination of an analog circuit and a digital circuit, and may also adopt a processor chip loaded with software, etc., and the controller C may realize voltage closed-loop control or open-loop control by using the voltage detection module M; the voltage detection module M may adopt a voltage divider, a voltage transformer, a hall element, and the like.
The invention controls the energy supplemented to the inductor I1 to flow to the load, so that when the requirement of load energy is met, the redundant current is directly transmitted to the outlet line in a bypass mode without passing through the load; the invention can make the efficiency of the constant current to constant voltage converter reach a high level.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. A constant current to constant voltage converter is provided with an incoming line and an outgoing line, wherein a constant current source is input between the incoming line and the outgoing line and is connected with an actual load L when in use, and the converter is characterized by comprising a first switching part, a second switching part, an inductor I1, a capacitor C1 and a capacitor C2, wherein the first switching part comprises a switching component S1 and/or a switching component S3, and the second switching part comprises a switching component S2 and/or a switching component S4;
the first switch end of the switch component S1 is connected to an incoming line, and the second switch end is connected to the first switch end of the switch component S2; a second switch terminal of the switch element S2 is connected to one terminal of the actual load L; a first switch terminal of the switch element S3 is connected to the outlet line, and a second switch terminal is connected to the first switch terminal of the switch element S4; a second switch end of the switch member S4 is connected to the other end of the actual load L;
the capacitor C1 is connected with the first switch end of the switch component S1 and the outgoing line, or the first switch end of the switch component S3 and the incoming line;
the inductor I1 is connected between the second switch end of the switch component S1 and the outgoing line, or between the second switch end of the switch component S3 and the incoming line;
the capacitor C2 is connected with the second switch end of the switch component S2 and the outlet line, or the second switch end of the switch component S4 and the inlet line;
when the converter is used, the output voltage of the constant current-to-constant voltage converter is kept constant by adjusting the duty ratio of the first switching part; the second switch part is in a turn-off state when the first switch part is turned on, and the second switch part is in a turn-on state when the first switch part is turned off;
the voltage of the capacitor C1 in a single switching period is controlled by adjusting the turn-off time of the first switching part, so as to control the energy stored in the capacitor C1, wherein the turn-off time of the first switching part is in direct proportion to the voltage of the capacitor C1, so as to control the energy stored in the inductor I1 in the single switching period, and further control the voltages of the capacitor C2 and two ends of a load.
2. The converter according to claim 1, wherein the inductor I1 is a double-winding inductor.
3. The constant-current to constant-voltage converter according to claim 1 or 2, further comprising:
a controller C for adjusting the duty ratio of the first switching part;
a driving module D1 disposed between the controller C and the control terminal of the first switching section, a driving module D2 disposed between the controller C and the control terminal of the second switching section;
the driving module D1 is configured to output a driving signal for controlling the first switching unit to turn on or off according to the duty ratio adjustment signal output by the controller C; the driving module D2 is configured to output a driving signal for controlling the second switching unit to turn on or off according to the duty ratio adjustment signal output by the controller C.
4. The converter according to claim 3, wherein the second switch is a controllable switch or an uncontrollable switch.
5. The constant current to constant voltage converter according to claim 4, further comprising:
the voltage detection module M is connected with the controller C and used for detecting the output voltage of the constant current-to-constant voltage converter; the controller C generates a duty ratio adjusting signal of the first switching part according to the output voltage given value and the output voltage feedback value detected by the voltage detection module M.
6. The constant current to constant voltage converter according to claim 5, further comprising:
the input end of the filter F1 is connected with an incoming line and an outgoing line, and the output end of the filter F1 is connected with the capacitor C1 in parallel.
7. The constant current to constant voltage converter according to claim 6, further comprising:
a filter F2; the input end of the filter F2 is connected in parallel with the capacitor C2, and the output end of the filter F2 is connected in parallel with the two ends of the actual load L.
8. A device for converting constant current to constant voltage, comprising at least two converters of claim 1, 2, 4, 5, 6 or 7.
9. The apparatus according to claim 8, wherein the input terminals of each of the constant current to constant voltage converters are connected in series with each other and the output terminals thereof are connected in series with each other.
10. The apparatus according to claim 8, wherein the input terminals of each of the constant current to constant voltage converters are connected in series and the output terminals thereof are connected in parallel.
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| CN201711123660.9A CN107863876B (en) | 2017-11-14 | 2017-11-14 | Converter for converting constant current into constant voltage and device for converting constant current into constant voltage |
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| CN2580673Y (en) * | 2002-08-05 | 2003-10-15 | 浙江大学 | Three electric level, passive and soft switching type DC transducer circuit |
| CN103683952A (en) * | 2013-11-22 | 2014-03-26 | 西南交通大学 | Parallel integrated Buck-Flyback power factor correction (PFC) converter topology |
| CN105305845A (en) * | 2015-11-13 | 2016-02-03 | 苏州扬佛自动化设备有限公司 | Boost-buck control circuit of switch power supply |
| CN105763028A (en) * | 2016-04-15 | 2016-07-13 | 大连泰思曼科技有限公司 | Constant-current to constant-voltage converter and constant-current to constant-voltage device |
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|---|---|---|---|---|
| CN2580673Y (en) * | 2002-08-05 | 2003-10-15 | 浙江大学 | Three electric level, passive and soft switching type DC transducer circuit |
| CN103683952A (en) * | 2013-11-22 | 2014-03-26 | 西南交通大学 | Parallel integrated Buck-Flyback power factor correction (PFC) converter topology |
| CN105305845A (en) * | 2015-11-13 | 2016-02-03 | 苏州扬佛自动化设备有限公司 | Boost-buck control circuit of switch power supply |
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| CN107863876A (en) | 2018-03-30 |
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