CN212518766U - Output circuit and switching power supply system applying same - Google Patents
Output circuit and switching power supply system applying same Download PDFInfo
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- CN212518766U CN212518766U CN202021311529.2U CN202021311529U CN212518766U CN 212518766 U CN212518766 U CN 212518766U CN 202021311529 U CN202021311529 U CN 202021311529U CN 212518766 U CN212518766 U CN 212518766U
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Abstract
The utility model discloses an output circuit and a switching power supply system using the same, which comprises a voltage reduction circuit for realizing voltage transformation regulation and a switched capacitor voltage stabilizing circuit for realizing voltage stabilization control; the signal input end of the voltage reduction circuit is used as the signal input end of the whole output circuit, the control end of the voltage reduction circuit is electrically connected with the enabling end of the switch capacitor voltage stabilizing circuit, the signal output end of the voltage reduction circuit is electrically connected with the signal input end of the switch capacitor voltage stabilizing circuit and is used as the energy storage end of the whole output circuit, and the signal output end or the electric wire grounding end of the switch capacitor voltage stabilizing circuit is used as the signal input end of the whole output circuit. The output circuit provided by the utility model has a simple and visual structure, ensures the use effect and improves the reliability; the circuit is applied to a switching power supply system, so that the system structure can be effectively optimized, and the manufacturing cost of the system can be reduced.
Description
Technical Field
The utility model relates to an output circuit and applied this circuit's switching power supply particularly, relate to an output circuit that has higher reliability, can realize multiple form's voltage output and applied this circuit's switching power supply system, belong to power semiconductor technical field.
Background
As a core component of modern electric energy conversion technology, and a structural foundation of various electrical mechanisms and devices, a switching power supply system has been widely applied in the fields of electric power, communication, traffic, industrial control, and the like. In addition, in recent years, the development and improvement of electronic power technology and industrial manufacturing level have been increasing, various switching power supply systems with different types and different functions have appeared in succession, and the technical selection space of users is greatly widened.
The switching circuit system with negative voltage output function, which is common in electrical mechanisms and devices, is taken as an example. Most of the circuits in the market at present adopt a Buck-boost or Buck topological structure, and the system comprises elements such as a rectifying element, a filter circuit, a power supply capacitor, an output capacitor, an energy storage inductor, a freewheeling diode, a feedback diode and a control chip. According to different actual use requirements, the filter circuit can be a pi-type filter circuit consisting of a filter capacitor and a filter inductor, or a differential mode inductor or a common mode inductor; the rectifying element can be a rectifying diode or a rectifying bridge.
However, in the practical application of such circuit systems, technicians find that the structure of such a system is often influenced by parasitic parameters in the circuit, thereby causing unstable system parameters. In addition, the electromagnetic interference of the whole system is serious, and the output ripple is large.
In addition, the conventional circuit system has many components, complicated internal structure and single function, which not only makes the assembly cost of the whole system relatively high, but also greatly limits the circuit system in the miniaturization application process. In addition, the switch circuit system is usually equipped with an inductive device, which is prone to problems of electromagnetic radiation, shielding, and the like, thereby further affecting the normal use of the circuit system.
Because of the above-mentioned shortcomings in the prior art, how to provide an output circuit capable of outputting various voltage with high reliability and a switching power supply system using the same based on the prior art has a negative voltage output function and overcomes the above-mentioned problems, which is a problem to be solved by those skilled in the art.
Disclosure of Invention
In view of the above-mentioned defects of the prior art, the present invention provides an output circuit with high reliability and capable of outputting various voltage outputs and a switching power supply system using the same, as follows.
An output circuit comprises a voltage reduction circuit for realizing voltage transformation regulation and a switched capacitor voltage stabilizing circuit for realizing voltage stabilization control;
the voltage reduction circuit is a chopper circuit, the switched capacitor voltage stabilizing circuit is a charge pump circuit, and the voltage reduction circuit and the switched capacitor voltage stabilizing circuit are connected in series in sequence;
the signal input end of the voltage reduction circuit is used as the signal input end of the whole output circuit, the control end of the voltage reduction circuit is electrically connected with the enable end of the switch capacitor voltage stabilizing circuit, the signal output end of the voltage reduction circuit is electrically connected with the signal input end of the switch capacitor voltage stabilizing circuit and is used as the energy storage end of the whole output circuit, and the signal output end of the switch capacitor voltage stabilizing circuit or the grounding end of an electric wire is used as the signal input end of the whole output circuit.
Preferably, the whole output circuit is a negative voltage output circuit;
at this time, the wire grounding end of the voltage reduction circuit is electrically connected with the wire grounding end of the switched capacitor voltage stabilizing circuit and serves as the wire grounding end of the whole output circuit, and the signal output end of the switched capacitor voltage stabilizing circuit serves as the signal output end of the whole output circuit.
Preferably, the whole output circuit is a half-voltage output circuit;
at this time, the wire grounding end of the voltage reduction circuit is electrically connected with the signal output end of the switched capacitor voltage stabilizing circuit and is used as the wire grounding end of the whole output circuit, and the wire grounding end of the switched capacitor voltage stabilizing circuit is used as the signal output end of the whole output circuit.
Preferably, the whole output circuit is a multi-output circuit;
the wire grounding end of the voltage reduction circuit is electrically connected with the signal output end of the switched capacitor voltage stabilizing circuit and serves as the wire grounding end of the whole output circuit, and the wire grounding end of the switched capacitor voltage stabilizing circuit serves as the signal output end of the whole output circuit;
at this time, the whole output circuit further comprises another switched capacitor voltage stabilizing circuit, an enabling end of the another switched capacitor voltage stabilizing circuit is electrically connected with a control end of the voltage reducing circuit, a signal input end of the another switched capacitor voltage stabilizing circuit is electrically connected with a signal output of the voltage reducing circuit and is jointly used as an energy storage end of the whole output circuit, an electric wire grounding end of the another switched capacitor voltage stabilizing circuit is electrically connected with an electric wire grounding end of the voltage reducing circuit and is jointly used as an electric wire grounding end of the whole output circuit, and a signal output end of the another switched capacitor voltage stabilizing circuit is used as another signal output end of the whole output circuit.
Preferably, the voltage reduction circuit includes a transistor, an input voltage division upper resistor, an input voltage division lower resistor, a first logic controller, a driver, a first output voltage division upper resistor, and a first output voltage division lower resistor;
the voltage-reducing circuit comprises a transistor, a first logic controller, a driver, a second logic controller, a first output end, a source electrode, a first output voltage-dividing upper resistor, a drain electrode, an input voltage-dividing upper resistor, a signal input end, a first output voltage-dividing lower resistor, a second output voltage-dividing upper resistor, a second output voltage-dividing lower resistor, a second logic controller, a source electrode, a second output voltage-dividing lower resistor, a first output voltage-dividing upper resistor, a second output voltage-dividing lower resistor, a first logic controller and a second output voltage-dividing lower resistor, wherein the drain electrode of the transistor is electrically connected with one end of the input voltage-dividing upper resistor, the signal input end of the whole voltage-reducing circuit is used as the signal input end of the whole voltage-reducing circuit, the other end of the input voltage-dividing The input end is electrically connected and transmits the output voltage division signal to the first logic controller; the other end of the input voltage-dividing lower resistor is electrically connected with the other end of the first output voltage-dividing lower resistor and serves as an electric wire grounding end of the whole voltage-reducing circuit.
Preferably, the switched capacitor voltage regulator circuit comprises a second logic controller, a first switch transistor, a second switch transistor, a third switch transistor, a fourth switch transistor, a second output voltage-dividing upper resistor and a second output voltage-dividing lower resistor;
one end of the first switch transistor is used as a signal input end of the whole switch capacitor voltage stabilizing circuit, the other end of the first switch transistor is electrically connected with one end of the second switch transistor and is used as a conversion capacitor anode of the whole switch capacitor voltage stabilizing circuit, one end of the fourth switch transistor is electrically connected with one end of the third switch transistor and is used as a conversion capacitor cathode of the whole switch capacitor voltage stabilizing circuit, the first input end of the second logic controller is used as an enabling end of the whole switch capacitor voltage stabilizing circuit and receives a control signal from a preceding stage circuit, the other end of the fourth switch transistor is electrically connected with one end of the second output voltage dividing upper resistor and is used as a signal output end of the whole switch capacitor voltage stabilizing circuit, the other end of the second output voltage dividing upper resistor is electrically connected with one end of the second output voltage dividing upper resistor and both of the second output voltage dividing upper resistor and the second output voltage dividing upper resistor are electrically connected with the second, And the other end of the second switch transistor is electrically connected with the other end of the third switch transistor and the other end of the second output voltage-dividing lower resistor respectively and serves as an electric wire grounding end of the whole switched capacitor voltage stabilizing circuit.
A switching power supply system comprises the output circuit, a rectifying device, an energy storage capacitor, a conversion capacitor and an output capacitor;
the input end of the rectifier device is electrically connected with an alternating current input line and serves as the input end of the whole switching power supply system, one end of the rectifier device is electrically connected with the signal input end of the output circuit, the other end of the rectifier device is electrically connected with the system ground, the energy storage end of the output circuit is electrically connected with the anode of the energy storage capacitor, the signal output end of the output circuit is electrically connected with one end of the output capacitor, two ends of the conversion capacitor are respectively electrically connected with the anode of the conversion capacitor of the switching capacitor voltage stabilizing circuit and the cathode of the conversion capacitor, and the electric wire grounding end of the output circuit, the cathode of the energy storage capacitor and the other end of the output capacitor are all electrically connected with the system ground.
Preferably, the rectifying device is a rectifying bridge or a rectifying diode.
Preferably, in an operating state of the switching power supply system, the energy storage capacitor completes charging of the conversion capacitor, and then the conversion capacitor completes charging of the output capacitor.
Preferably, in an operating state of the switching power supply system, a relationship among the voltage Vd of the energy storage capacitor, the voltage Vf of the conversion capacitor and the voltage Vo of the output capacitor is that Vd is greater than or equal to Vf and greater than Vo.
Compared with the prior art, the utility model discloses an advantage mainly embodies in following several aspects:
the utility model provides an output circuit wholly comprises step-down circuit and the switched capacitor voltage stabilizing circuit who connects according to the order of sequence, and circuit structure is succinct directly perceived, furthest has guaranteed the holistic reliability of circuit and stability when having guaranteed the voltage output effect. And simultaneously, the utility model discloses an output circuit can also realize like the voltage output of different forms such as negative pressure output, half pressure output and multiplexed output through the change of internal connection mode, and the function is various, the range of application is extensive.
Will the utility model discloses an output circuit is applied to among the switching power supply system, can optimize whole switching power supply system effectively, make the system architecture become more retrencied. The whole switching power supply system is composed of a rectifying device, an energy storage capacitor, a conversion capacitor, an output capacitor and the like, and a filter circuit and an inductor are not required to be arranged. And simultaneously, the utility model discloses well each part that uses, each components and parts are ordinary easy current product and the homoenergetic that uses realizes the installation, the setting that integrate for the holistic manufacturing cost of scheme has obtained reducing by a wide margin.
Furthermore, the utility model discloses also for other relevant schemes in the same field provide the reference, can use this to extend as the foundation, apply to in the design of other negative pressure output circuit in the same field, have wide application prospect.
The following detailed description is made of specific embodiments of the present invention with reference to the accompanying drawings, so as to make the technical solution of the present invention easier to understand and master.
Drawings
Fig. 1 is a schematic diagram of a hardware structure of a switching power supply system according to the present invention;
fig. 2 is a schematic diagram of a hardware structure of the voltage reduction circuit when the output circuit of the present invention is a negative voltage output circuit;
fig. 3 is a schematic diagram of a hardware structure of the switched capacitor voltage stabilizing circuit when the output circuit of the present invention is a negative voltage output circuit;
fig. 4 is a schematic diagram of a hardware structure when the output circuit of the present invention is a half-voltage output circuit;
fig. 5 is a schematic diagram of a hardware structure when the output circuit of the present invention is a multi-output circuit;
wherein: 1. a voltage reduction circuit; 11. a transistor; 12. inputting a voltage division upper resistor; 13. inputting a resistor under voltage division; 14. a first logic controller; 15. a driver; 16. a first output voltage-dividing upper resistor; 17. a first output voltage-dividing lower resistor; 2. a switched capacitor voltage stabilizing circuit; 21. a second logic controller; 22. a first switching transistor; 23. a second switching transistor; 24. a third switching transistor; 25. a fourth switching transistor; 26. a second output voltage-dividing upper resistor; 27. a second output voltage-dividing lower resistor; 3. another switched capacitor voltage regulator circuit; 4. a rectifying device; 5. an energy storage capacitor; 6. converting the capacitance; 7. and an output capacitor.
Detailed Description
The utility model discloses an output circuit and applied this circuit's switching power supply system that has higher reliability, can realize the voltage output of multiform, specifically as follows.
An output circuit, as shown in fig. 1, includes a voltage reduction circuit 1 for implementing voltage transformation regulation and a switched capacitor voltage regulator circuit 2 for implementing voltage regulation control; the voltage reduction circuit 1 and the switched capacitor voltage stabilizing circuit 2 are connected in series in sequence.
The signal input end Vin1 of the voltage reduction circuit 1 is used as the signal input end Vin of the whole output circuit, the control end CTRL1 of the voltage reduction circuit 1 is electrically connected with the enable end EN2 of the switched capacitor voltage regulator circuit 2, the signal output end Vout1 of the voltage reduction circuit 1 is electrically connected with the signal input end Vin2 of the switched capacitor voltage regulator circuit 2 and is used as the energy storage end VD of the whole output circuit, and the signal output end Vout2 of the switched capacitor voltage regulator circuit 2 or the wire ground GND2 is used as the signal input end Vout of the whole output circuit.
According to different connection modes between the voltage reduction circuit 1 and the rest part of the switched capacitor voltage stabilizing circuit 2, the whole output circuit has three different function realization modes, namely a negative voltage output circuit, a half voltage output circuit and a multi-path output circuit.
First, when the whole output circuit is a negative voltage output circuit, the wire ground GND1 of the voltage-reducing circuit 1 is electrically connected to the wire ground GND2 of the switched capacitor voltage regulator circuit 2 and serves as the wire ground GND of the whole output circuit, and the signal output terminal Vout2 of the switched capacitor voltage regulator circuit 2 serves as the signal output terminal Vout of the whole output circuit.
In this embodiment, the voltage-reducing circuit 1 is a chopper circuit, and the specific structure is shown in fig. 2.
The voltage reduction circuit 1 includes a transistor 11, an input voltage division upper resistor 12, an input voltage division lower resistor 13, a first logic controller 14, a driver 15, a first output voltage division upper resistor 16, and a first output voltage division lower resistor 17.
In the above hardware structure, the transistor 11 is a power transistor, and is used for providing a high-power output for the signal output terminal Vout1 of the whole voltage-reducing circuit 1; the input voltage division upper resistor 12 and the input voltage division lower resistor 13 are mainly used for detecting input voltage; the first logic controller 14 is configured to control the transistor 11 according to the input voltage detection results of the input voltage dividing upper resistor 12 and the input voltage dividing lower resistor 13, and generate an enable signal to control a subsequent circuit; the first output voltage-dividing upper resistor 16 and the first output voltage-dividing lower resistor 17 are both mainly used for detecting the output voltage of the signal output terminal Vout1 of the entire voltage-reducing circuit 1.
A drain of the transistor 11 is electrically connected to one end of the input voltage dividing upper resistor 12 to serve as a signal input end of the entire voltage dropping circuit 1, the other end of the input voltage dividing upper resistor 12 is electrically connected to one end of the input voltage dividing lower resistor 13, and both of the two are electrically connected to a first input end of the first logic controller 14 to transmit an input voltage dividing signal to the first logic controller 14, a first output end of the first logic controller 14 is electrically connected to an input end of the driver 15, an output end of the driver 15 is electrically connected to a gate of the transistor 11, a second output end of the first logic controller 14 serves as a control end CTRL1 of the entire voltage dropping circuit 1, a source of the transistor 11 is electrically connected to the first output voltage dividing upper resistor 16 to serve as a signal output end Vout1 of the entire voltage dropping circuit 1, and the other end of the first output voltage dividing upper resistor 16 is electrically connected to one end of the first output voltage dividing lower resistor 17 Connected and both electrically connected to a second input terminal of the first logic controller 14, and transmitting the output divided voltage signal to the first logic controller 14; the other end of the input voltage-dividing lower resistor 13 is electrically connected to the other end of the first output voltage-dividing lower resistor 17, and serves as a wire ground GND1 of the entire step-down circuit 1.
In this embodiment, the switched capacitor voltage regulator circuit 2 is a charge pump circuit, and the specific structure is shown in fig. 3.
The switched capacitor voltage regulator circuit 2 includes a second logic controller 21, a first switching transistor 22, a second switching transistor 23, a third switching transistor 24, a fourth switching transistor 25, a second output voltage-dividing upper resistor 26, and a second output voltage-dividing lower resistor 27.
In the above hardware structure, the second output voltage-dividing upper resistor 26 and the second output voltage-dividing lower resistor 27 are mainly used for detecting the output voltage of the signal output terminal Vout2 of the entire switched capacitor voltage regulator circuit 2; the second logic controller 21 is configured to control the on/off of the first switching transistor 22, the second switching transistor 23, the third switching transistor 24 and the fourth switching transistor 25 according to the voltage detection results of the second output voltage-dividing upper resistor 26 and the second output voltage-dividing lower resistor 27 and the control signal of the enable terminal EN2 of the entire switched capacitor voltage stabilizing circuit 2.
One end of the first switch transistor 22 is used as a signal input end Vin2 of the whole switch capacitor voltage stabilizing circuit 2, the other end of the first switch transistor 22 is electrically connected with one end of the second switch transistor 23 and is used as a conversion capacitor positive pole Fly + of the whole switch capacitor voltage stabilizing circuit 2, one end of the fourth switch transistor 25 is electrically connected with one end of the third switch transistor 24 and is used as a conversion capacitor negative pole Fly-of the whole switch capacitor voltage stabilizing circuit 2, the first input end of the second logic controller 21 is used as an enable end EN2 of the whole switch capacitor voltage stabilizing circuit 2 and receives a control signal from a preceding circuit, the other end of the fourth switch transistor 25 is electrically connected with one end of the second output voltage dividing upper resistor 26 and is used as a signal output end Vout2 of the whole switch capacitor voltage stabilizing circuit 2, the other end of the second output voltage dividing upper resistor 26 is electrically connected with one end of the second output voltage dividing lower resistor 27, and both ends of the second output voltage The second switch transistor 23 is electrically connected to a second input terminal of the second logic controller 21, and transmits an output voltage-dividing signal to the second logic controller 21, and another end of the second switch transistor 23 is electrically connected to another end of the third switch transistor 24 and another end of the second output voltage-dividing lower resistor 27, respectively, and serves as an electric wire ground GND2 of the entire switched capacitor voltage regulator circuit 2.
Next, when the entire output circuit is a half-voltage output circuit, the hardware connection relationship at this time is as shown in fig. 4.
At this time, the wire ground GND1 of the voltage-reducing circuit 1 is electrically connected to the signal output terminal Vout2 of the switched capacitor voltage regulator circuit 2, and serves as the wire ground GND of the entire output circuit, and the wire ground GND2 of the switched capacitor voltage regulator circuit 2 serves as the signal output terminal Vout of the entire output circuit.
In addition, when the whole output circuit is a multi-output circuit, the hardware connection relationship at this time is as shown in fig. 5.
The wire ground terminal GND1 of the voltage-reducing circuit 1 is electrically connected to the signal output terminal Vout2 of the switched capacitor voltage regulator circuit 2, and serves as the wire ground terminal GND of the entire output circuit, and the wire ground terminal GND2 of the switched capacitor voltage regulator circuit 2 serves as the signal output terminal VoutA of the entire output circuit.
At this time, the output circuit also comprises another switched capacitor voltage stabilizing circuit 3; the enable terminal EN3 of the another switched capacitor voltage regulator circuit 3 is electrically connected to the control terminal CTRL1 of the voltage-reducing circuit 1, the signal input terminal Vin3 of the another switched capacitor voltage regulator circuit 3 is connected to the signal output terminal Vout1 of the voltage-reducing circuit 1, and collectively serves as the energy storage terminal VD of the entire output circuit, the wire ground terminal GND3 of the another switched capacitor voltage regulator circuit 3 is electrically connected to the wire ground terminal GND1 of the voltage-reducing circuit 1, and collectively serves as the wire ground terminal GND of the entire output circuit, and the signal output terminal Vout3 of the another switched capacitor voltage regulator circuit 3 serves as another signal output terminal VoutB of the entire output circuit.
It should be noted that, in the switched capacitor voltage regulator circuit 2 or the other switched capacitor voltage regulator circuit 3, the function and the operation standard of the enable terminal are the same, that is, when the voltage signal received by the enable terminal is low, the circuit to which the enable terminal belongs does not work and does not generate voltage signal output; when the voltage signal received by the enabling end is high, the circuit to which the enabling end belongs works, generates a voltage signal to output and maintains the voltage within a preset voltage range.
A switching power supply system, as shown in fig. 1, includes an output circuit as described above, and further includes a rectifying device 4, an energy storage capacitor 5, a conversion capacitor 6, and an output capacitor 7;
the input end of the rectifier device 4 is electrically connected with an alternating current input line and serves as the input end of the whole switching power supply system, one end of the rectifier device 4 is electrically connected with the signal input end Vin of the output circuit, the other end of the rectifier device 4 is electrically connected with the system ground, the energy storage end VD of the output circuit is electrically connected with the anode of the energy storage capacitor 5, the signal output end Vout of the output circuit is electrically connected with one end of the output capacitor 7, the two ends of the conversion capacitor 6 are respectively electrically connected with the conversion capacitor anode Fly + and the conversion capacitor cathode Fly-of the switching capacitor voltage stabilizing circuit 2, and the wire grounding end GND of the output circuit, the cathode of the energy storage capacitor 5 and the other end of the output capacitor 7 are all electrically connected with the system ground.
In the solution of the present invention, the rectifying device 4 is preferably a rectifier bridge or a rectifier diode.
In addition, in the operating state of the switching power supply system, the energy storage capacitor 5 completes charging of the conversion capacitor 6, and then the conversion capacitor 6 completes charging of the output capacitor 7.
And under the operation state of the switching power supply system, the relationship among the voltage Vd of the energy storage capacitor 5, the voltage Vf of the conversion capacitor 6 and the voltage Vo of the output capacitor is that Vd is more than or equal to Vf and more than Vo.
To sum up, the utility model provides an output circuit wholly comprises voltage reduction circuit and the switched capacitor voltage stabilizing circuit who connects according to the order of sequence, and circuit structure is succinct directly perceived, furthest has guaranteed the holistic reliability of circuit and stability when having guaranteed the voltage output effect. And simultaneously, the utility model discloses an output circuit can also realize like the voltage output of different forms such as negative pressure output, half pressure output and multiplexed output through the change of internal connection mode, and the function is various, the range of application is extensive.
Will the utility model discloses an output circuit is applied to among the switching power supply system, can optimize whole switching power supply system effectively, make the system architecture become more retrencied. The whole switching power supply system consists of a rectifying device, an output circuit, an energy storage capacitor, a conversion capacitor and an output capacitor, and a filter circuit and an inductor are not required to be arranged. And simultaneously, the utility model discloses well each part that uses, each components and parts are ordinary easy current product and the homoenergetic that uses realizes the installation, the setting that integrate for the holistic manufacturing cost of scheme has obtained reducing by a wide margin.
Furthermore, the utility model discloses also for other relevant schemes in the same field provide the reference, can use this to extend as the foundation, apply to in the design of other output circuit in the same field, have wide application prospect.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein, and any reference signs in the claims are not intended to be construed as limiting the claim concerned.
Finally, it should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should integrate the description, and the technical solutions in the embodiments can be appropriately combined to form other embodiments understood by those skilled in the art.
Claims (10)
1. An output circuit, characterized by: the voltage stabilizing circuit comprises a voltage reducing circuit (1) for realizing voltage transformation regulation and a switched capacitor voltage stabilizing circuit (2) for realizing voltage stabilization control;
the voltage reduction circuit (1) is a chopper circuit, the switched capacitor voltage stabilizing circuit (2) is a charge pump circuit, and the voltage reduction circuit (1) and the switched capacitor voltage stabilizing circuit (2) are connected in series in sequence;
the signal input end of the voltage reduction circuit (1) serves as the signal input end of the whole output circuit, the control end of the voltage reduction circuit (1) is electrically connected with the enabling end of the switch capacitor voltage stabilizing circuit (2), the signal output end of the voltage reduction circuit (1) is electrically connected with the signal input end of the switch capacitor voltage stabilizing circuit (2) and serves as the energy storage end of the whole output circuit, and the signal output end or the wire grounding end of the switch capacitor voltage stabilizing circuit (2) serves as the signal input end of the whole output circuit.
2. An output circuit according to claim 1, wherein: the whole output circuit is a negative voltage output circuit;
at this time, the wire grounding end of the voltage reduction circuit (1) is electrically connected with the wire grounding end of the switched capacitor voltage stabilizing circuit (2) and serves as the wire grounding end of the whole output circuit, and the signal output end of the switched capacitor voltage stabilizing circuit (2) serves as the signal output end of the whole output circuit.
3. An output circuit according to claim 1, wherein: the whole output circuit is a half-voltage output circuit;
at this time, the wire grounding end of the voltage reduction circuit (1) is electrically connected with the signal output end of the switched capacitor voltage stabilizing circuit (2) and serves as the wire grounding end of the whole output circuit, and the wire grounding end of the switched capacitor voltage stabilizing circuit (2) serves as the signal output end of the whole output circuit.
4. An output circuit according to claim 1, wherein: the whole output circuit is a multi-path output circuit;
the wire grounding end of the voltage reduction circuit (1) is electrically connected with the signal output end of the switched capacitor voltage stabilizing circuit (2) and serves as the wire grounding end of the whole output circuit, and the wire grounding end of the switched capacitor voltage stabilizing circuit (2) serves as the signal output end of the whole output circuit;
at this moment, the whole output circuit further comprises another switched capacitor voltage stabilizing circuit (3), an enabling end of the another switched capacitor voltage stabilizing circuit (3) is electrically connected with a control end of the voltage reducing circuit (1), a signal input end of the another switched capacitor voltage stabilizing circuit (3) is electrically connected with a signal output of the voltage reducing circuit (1) and jointly serves as an energy storage end of the whole output circuit, an electric wire grounding end of the another switched capacitor voltage stabilizing circuit (3) is electrically connected with an electric wire grounding end of the voltage reducing circuit (1) and jointly serves as an electric wire grounding end of the whole output circuit, and a signal output end of the another switched capacitor voltage stabilizing circuit (3) serves as another signal output end of the whole output circuit.
5. An output circuit according to claim 2, wherein: the voltage reduction circuit (1) is a chopper circuit;
the voltage reduction circuit (1) comprises a transistor (11), an input voltage division upper resistor (12), an input voltage division lower resistor (13), a first logic controller (14), a driver (15), a first output voltage division upper resistor (16) and a first output voltage division lower resistor (17);
the drain electrode of the transistor (11) is electrically connected with one end of the input voltage division upper resistor (12) and serves as a signal input end of the whole voltage reduction circuit (1), the other end of the input voltage division upper resistor (12) is electrically connected with one end of the input voltage division lower resistor (13), the two ends of the input voltage division upper resistor and the input voltage division lower resistor are electrically connected with a first input end of the first logic controller (14) and transmit an input voltage division signal to the first logic controller (14), a first output end of the first logic controller (14) is electrically connected with an input end of the driver (15), an output end of the driver (15) is electrically connected with the grid electrode of the transistor (11), a second output end of the first logic controller (14) serves as a control end of the whole voltage reduction circuit (1), and a source electrode of the transistor (11) is electrically connected with the first output voltage division upper resistor (16), As a signal output end of the whole voltage reduction circuit (1), the other end of the first output voltage division upper resistor (16) is electrically connected with one end of the first output voltage division lower resistor (17), both of which are electrically connected with a second input end of the first logic controller (14), and transmits an output voltage division signal to the first logic controller (14); the other end of the input voltage division lower resistor (13) is electrically connected with the other end of the first output voltage division lower resistor (17) and is used as an electric wire grounding end of the whole voltage reduction circuit (1).
6. An output circuit according to claim 2, wherein: the switched capacitor voltage stabilizing circuit (2) is a charge pump circuit;
the switched capacitor voltage stabilizing circuit (2) comprises a second logic controller (21), a first switching transistor (22), a second switching transistor (23), a third switching transistor (24), a fourth switching transistor (25), a second output voltage division upper resistor (26) and a second output voltage division lower resistor (27);
one end of the first switch transistor (22) is used as a signal input end of the whole switch capacitance voltage stabilizing circuit (2), the other end of the first switch transistor (22) is electrically connected with one end of the second switch transistor (23) and is used as a conversion capacitor anode of the whole switch capacitance voltage stabilizing circuit (2), one end of the fourth switch transistor (25) is electrically connected with one end of the third switch transistor (24) and is used as a conversion capacitor cathode of the whole switch capacitance voltage stabilizing circuit (2), a first input end of the second logic controller (21) is used as an enabling end of the whole switch capacitance voltage stabilizing circuit (2) and receives a control signal from a preceding circuit, and the other end of the fourth switch transistor (25) is electrically connected with one end of the second output voltage dividing upper resistor (26) and is used as a signal output end of the whole switch capacitance voltage stabilizing circuit (2), the other end of the second output voltage-dividing upper resistor (26) is electrically connected with one end of the second output voltage-dividing lower resistor (27), both of which are electrically connected with the second input end of the second logic controller (21), and transmits an output voltage-dividing signal to the second logic controller (21), and the other end of the second switch transistor (23) is electrically connected with the other end of the third switch transistor (24) and the other end of the second output voltage-dividing lower resistor (27) respectively and serves as an electric wire grounding end of the whole switched capacitor voltage-stabilizing circuit (2).
7. A switching power supply system comprising an output circuit according to any one of claims 1 to 6, characterized in that: the circuit also comprises a rectifying device (4), an energy storage capacitor (5), a conversion capacitor (6) and an output capacitor (7);
the input end of the rectifier device (4) is electrically connected with an alternating current input line and serves as the input end of the whole switching power supply system, one end of the rectifier device (4) is electrically connected with the signal input end of the output circuit, the other end of the rectifier device (4) is electrically connected with the system ground, the energy storage end of the output circuit is electrically connected with the anode of the energy storage capacitor (5), the signal output end of the output circuit is electrically connected with one end of the output capacitor (7), two ends of the conversion capacitor (6) are respectively electrically connected with the anode of the conversion capacitor and the cathode of the conversion capacitor of the switching capacitor voltage stabilizing circuit (2), and the wire grounding end of the output circuit, the cathode of the energy storage capacitor (5) and the other end of the output capacitor (7) are all electrically connected with the system ground.
8. The switching power supply system according to claim 7, wherein: the rectifying device (4) is a rectifying bridge or a rectifying diode.
9. The switching power supply system according to claim 7, wherein: in the operating state of the switching power supply system, the energy storage capacitor (5) completes charging of the conversion capacitor (6), and then the conversion capacitor (6) completes charging of the output capacitor (7).
10. The switching power supply system according to claim 7, wherein in the operating state of the switching power supply system, the relationship among the voltage Vd of the energy storage capacitor (5), the voltage Vf of the conversion capacitor (6) and the voltage Vo of the output capacitor is that Vd is larger than or equal to Vf and larger than Vo.
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| CN202021311529.2U CN212518766U (en) | 2020-07-07 | 2020-07-07 | Output circuit and switching power supply system applying same |
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| CN202021311529.2U CN212518766U (en) | 2020-07-07 | 2020-07-07 | Output circuit and switching power supply system applying same |
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