CN218997911U

CN218997911U - Open loop isolation power supply generation circuit

Info

Publication number: CN218997911U
Application number: CN202122927084.1U
Authority: CN
Inventors: 夏志超; 陈波
Original assignee: Shanghai Shineng Electrical Appliance Equipment Co ltd
Current assignee: Shanghai Shineng Electrical Appliance Equipment Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2023-05-09
Anticipated expiration: 2031-11-25

Abstract

The application relates to the technical field of power supply circuits, in particular to an open-loop isolation power supply generation circuit, which comprises a control switch module, a voltage transformation isolation module and an output module, wherein the control switch module is connected with an external power supply, the output end of the control switch module is connected with the input end of the voltage transformation isolation module, the input end of the output module is connected with the output end of the voltage transformation isolation module, the output module comprises a ripple wave improving unit, and the output end of the ripple wave improving unit is connected with an output load; the power supply device has the advantage of improving the output stability of the power supply.

Description

Open loop isolation power supply generation circuit

Technical Field

The application relates to the technical field of power supply circuits, in particular to an open-loop isolation power supply generating circuit.

Background

In some power applications, a very low power supply may be required, typically with only a few milliamp to tens of milliamp of current flowing through the load, and requiring primary-secondary side isolation.

In the related art, a conventional power supply source adopts a power frequency transformer isolation or a switching stabilized voltage supply to output low-power voltage.

With respect to the above-described related art, the inventors consider that there are the following problems: the power efficiency of the conventional switching voltage-stabilized power supply is higher, but the switching voltage-stabilized power supply is easy to be disturbed in the working process, so that the output stability of the switching voltage-stabilized power supply has a little shortage.

Disclosure of Invention

In order to improve output stability of a power supply, the application provides an open loop isolation power supply generation circuit.

The open loop isolation power supply generation circuit adopts the following technical scheme:

the open loop isolation power supply generation circuit comprises a control switch module, a transformation isolation module and an output module, wherein the control switch module is connected with an external power supply, the output end of the control switch module is connected with the input end of the transformation isolation module, the input end of the output module is connected with the output end of the transformation isolation module, the output module comprises a ripple improving unit, and the output end of the ripple improving unit is connected with an output load.

Through adopting above-mentioned technical scheme, after control switch module received periodic control signal, with vary voltage isolation module and external power supply switch on, the voltage that external power supply produced is through output module output after vary voltage isolation module vary voltage, wherein, the voltage is through the vary voltage back, input in advance in the ripple improves the unit, after voltage stabilization, output to the output load through the output of ripple improvement unit, improve the ripple of the voltage of output, indirectly improve power supply's output stability.

Preferably, the ripple improving unit includes a voltage stabilizing capacitor, and the voltage stabilizing capacitor is respectively connected with the voltage transformation isolation module and the output load in parallel.

By adopting the technical scheme, the voltage flows into the voltage stabilizing capacitor, the voltage stabilizing capacitor stores the voltage, and after the waveform of the voltage is relatively gentle, the voltage is output, so that the purpose of improving the ripple wave of the output voltage is achieved.

Preferably, the output module further comprises a rectifying unit, an input end of the rectifying unit is connected with an output end of the voltage transformation isolation module, and an output end of the rectifying unit is connected with an input end of the ripple improving unit.

By adopting the technical scheme, the alternating voltage is rectified by the rectifying unit and then becomes direct voltage, and then is output by the ripple improving unit.

Preferably, the rectifying unit comprises a rectifying diode, an anode of the rectifying diode is connected with the output end of the voltage transformation isolation module, and a cathode of the rectifying diode is connected with one end of the voltage stabilizing capacitor.

Through adopting above-mentioned technical scheme, alternating voltage flows through rectifier diode after, becomes direct voltage, and wherein rectifier diode's effective breakdown voltage is high, and reverse leakage current is little to make the voltage of output less to circuit overall influence, indirectly improved power supply's stability.

Preferably, the output module further comprises a charging unit, the charging unit comprises a charging capacitor and a switching diode, one end of the charging capacitor is connected with the output end of the voltage transformation isolation module, the other end of the charging capacitor is connected with the anode of the rectifying diode, the switching diode is connected with the voltage transformation isolation module in parallel, and the cathode of the switching diode is connected with the anode of the rectifying diode.

Through adopting above-mentioned technical scheme, when the direction of electric current is unanimous with the direction of switch diode, switch diode switches on, and the charge capacitor charges, and when the direction of electric current and the opposite direction of switch diode, rectifier diode switches on, and the charge capacitor discharges to the logical alternating current of reinforcing charge capacitor hinders direct current effect.

Preferably, the switching unit includes a first switching triode and a second switching triode, the bases of the first switching triode and the second switching triode are connected with periodic control signals, the emitter of the first switching triode is connected with the collector of the second switching triode, and the emitter of the first switching triode is connected with the collector of the second switching triode and the input end of the filtering module.

Through adopting above-mentioned technical scheme, the projecting pole of first switch triode and second switch triode access periodic control signal to change the operating condition of first switch triode and second switch diode, and then make the projecting pole of first switch triode and the collecting electrode of second switch triode be connected output high level or low level, and then control the work of vary voltage isolation module, consequently, only need can accomplish control work through projecting pole and the second switch triode of first switch triode, easy and simple to handle, and the cost is also lower relatively.

Preferably, the transformer comprises a transformer isolation module, a control switch module and a filtering module, wherein the input end of the filtering module is connected with the output end of the control switch module, and the output end of the filtering module is connected with the input end of the transformer isolation module.

Through adopting above-mentioned technical scheme, after the filtering effect of voltage through filtering module, can filter clutter signal, improve the wave form of voltage, indirectly improve power supply's output stability.

Preferably, the voltage transformation isolation module comprises an isolation transformer, the primary side of the isolation transformer is connected with the control switch module, a plurality of output modules are arranged, and a plurality of output modules are connected with the secondary side of the isolation transformer.

By adopting the technical scheme, a plurality of groups of windings can be added on the secondary side of the isolation transformer to increase the number of paths of the isolation power supply, so as to realize multi-path output.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the ripple voltage control circuit can improve the ripple of the output voltage by outputting the output end of the ripple improving unit to the output load, and indirectly improve the output stability of the power supply;

2. the method and the device can discharge the charging capacitor so as to enhance the AC-DC-resisting effect of the charging capacitor;

3. the multi-channel power supply circuit can increase the number of channels of the isolated power supply by adding a plurality of groups of windings on the secondary side of the isolation transformer, and realizes multi-channel output.

Drawings

Fig. 1 is a schematic circuit diagram of an embodiment of the present application.

Reference numerals illustrate: 1. a control switch module; 2. a filtering module; 3. a voltage transformation isolation module; 4. an output module; 41. a charging unit; 42. a rectifying unit; 43. and a ripple improving unit.

Detailed Description

The present application is described in further detail below in conjunction with fig. 1.

The embodiment of the application discloses an open loop isolation power supply generating circuit. Referring to fig. 1, an open loop isolation power supply generating circuit includes a control switch module 1, a filter module 2, a transformation isolation module 3, and an output module 4, where the control switch module 1 is used as a switch of a power supply, the transformation isolation module 3 is used for isolating a loop, and the output module 4 is used for outputting a voltage.

Referring to fig. 1, a schematic circuit diagram of the present embodiment is shown, and the above modules are described in detail:

specifically, the control switch module 1 includes a switch unit, the switch unit includes a first switch triode Q1 and a second switch triode Q2, in this embodiment, the first switch triode Q1 adopts an N-type triode, the second switch triode Q2 adopts a P-type triode, the collector of the first switch triode Q1 is externally connected with a power supply Vcc, and the base of the first switch triode Q1 is connected with a control signal, in this embodiment, the control signal adopts a PWM wave. Meanwhile, a collector electrode of the second switching triode Q2 is electrically connected with an emitter electrode of the first switching triode Q1, a base electrode of the second switching triode Q2 is also connected with a control signal, and the emitter electrode of the second switching triode Q2 is grounded. When the control signal is high-level input, the first switching triode Q1 is conducted, the second switching triode Q2 is cut off, the emitter of the first switching triode Q1 outputs high level, and conversely, when the control signal is low-level input, the first switching triode Q1 is cut off, the second switching triode Q2 is conducted, and the collector of the second switching triode Q2 outputs low level. Therefore, the switching unit can output alternating current signals with high and low levels according to the control signals, the control work can be completed only through the emitter electrode of the first switching triode Q1 and the second switching triode Q2, the operation is simple and convenient, and compared with a switching regulated power supply, the requirements on components such as a control chip and the like are reduced, and the cost is reduced.

In addition, the filter module 2 includes filter capacitor C1, and filter capacitor C1's one end is connected with the projecting pole of first switch triode Q1 and the collector electricity of second switch triode Q2 respectively, and filter capacitor C1's the other end is connected with the input electricity of vary voltage isolation module 3, and after filter module 2's the filtering effect of voltage, can filter clutter signal, improve the wave form of voltage, indirectly improve power supply's output stability.

In addition, the voltage transformation isolation module 3 includes an isolation transformer T1, and the primary side of the isolation transformer T1 is electrically connected to one end of the filter capacitor C1 and the emitter of the second switching triode Q2, respectively. In addition, the output modules 4 are provided with a plurality of, and the plurality of output modules 4 are connected with the secondary side of the isolation transformer T1, and a plurality of groups of windings can be added on the secondary side of the isolation transformer T1 to increase the number of paths of the isolation power supply, so that multipath output is realized.

Specifically, the output module 4 includes a charging unit 41, a rectifying unit 42, and a ripple improving unit 43, the charging unit 41 includes a charging capacitor C2 and a switching diode D1, one end of the charging capacitor C2 is electrically connected to a secondary side of the isolating transformer T1, the other end of the charging capacitor C2 is electrically connected to an input end of the rectifying unit 42, meanwhile, the switching diode D1 is connected in parallel to the isolating transformer T1, and a cathode of the switching diode D1 is electrically connected to an input end of the rectifying unit 42.

The rectifying unit 42 includes a rectifying diode D2, and an anode of the rectifying diode D2 is electrically connected to one end of the charging capacitor C2 and a cathode of the switching diode D1, respectively, and the other end of the rectifying diode D2 is electrically connected to an input terminal of the ripple improving unit 43.

When the direction of the current is consistent with the direction of the switch diode D1, the switch diode D1 is conducted, the charging capacitor C2 is charged, when the direction of the current is opposite to the direction of the switch diode D1, the rectifying diode D2 is conducted, and the charging capacitor C2 is discharged, so that the direct current blocking effect of the charging capacitor C2 is enhanced. In addition, the alternating voltage is changed into direct voltage after flowing through the rectifying diode D2, wherein the effective breakdown voltage of the rectifying diode D2 is high, the reverse leakage current is small, so that the output voltage has small influence on the whole circuit, and the stability of the power supply is indirectly improved.

Specifically, the ripple improving unit 43 includes a voltage stabilizing capacitor C3, where the voltage stabilizing capacitor C3 is connected in parallel with the isolation transformer T1 and the output load, one end of the voltage stabilizing capacitor C3 is electrically connected to the cathode of the rectifier diode D2, the voltage flows into the voltage stabilizing capacitor, the voltage stabilizing capacitor stores the voltage, and after the waveform of the voltage is relatively gentle, the voltage is output, so as to achieve the purpose of improving the ripple of the output voltage.

The implementation principle of the open loop isolation power supply generation circuit in the embodiment of the application is as follows: after receiving the periodic control signal, the control switch module 1 connects the voltage transformation isolation module 3 with an external power supply, and the voltage generated by the external power supply is transformed by the voltage transformation isolation module 3 and then output through the output module 4, wherein the voltage is pre-input into the ripple improving unit 43 after being transformed, and is output to an output load through the output end of the ripple improving unit 43 after being stabilized, so that the ripple of the output voltage is improved, and the output stability of the power supply is indirectly improved.

The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.

Claims

1. An open loop isolation power supply generating circuit is characterized in that: the device comprises a control switch module (1), a transformation isolation module (3) and an output module (4), wherein the control switch module (1) is connected with an external power supply, the output end of the control switch module (1) is connected with the input end of the transformation isolation module (3), the input end of the output module (4) is connected with the output end of the transformation isolation module (3), the output module (4) comprises a ripple improving unit (43), and the output end of the ripple improving unit (43) is connected with an output load.

2. The open loop isolated power supply generation circuit of claim 1, wherein: the ripple improving unit (43) comprises a voltage stabilizing capacitor which is respectively connected with the voltage transformation isolation module (3) and the output load in parallel.

3. An open loop isolated power supply generation circuit according to claim 2, wherein: the output module (4) further comprises a rectifying unit (42), the input end of the rectifying unit (42) is connected with the output end of the voltage transformation isolation module (3), and the output end of the rectifying unit (42) is connected with the input end of the ripple wave improving unit (43).

4. An open loop isolated power supply generation circuit according to claim 3, wherein: the rectifying unit (42) comprises a rectifying diode, the anode of the rectifying diode is connected with the output end of the voltage transformation isolation module (3), and the cathode of the rectifying diode is connected with one end of the voltage stabilizing capacitor.

5. The open loop isolated power supply generation circuit of claim 4, wherein: the output module (4) further comprises a charging unit (41), the charging unit (41) comprises a charging capacitor and a switching diode, one end of the charging capacitor is connected with the output end of the voltage transformation isolation module (3), the other end of the charging capacitor is connected with the anode of the rectifying diode, the switching diode is connected with the voltage transformation isolation module (3) in parallel, and the cathode of the switching diode is connected with the anode of the rectifying diode.

6. The open loop isolated power supply generation circuit of claim 1, wherein: the switch module (1) comprises a first switch triode and a second switch triode, wherein the base electrodes of the first switch triode and the second switch triode are connected with periodic control signals, the emitting electrode of the first switch triode is connected with the collecting electrode of the second switch triode, and the emitting electrode of the first switch triode and the collecting electrode of the second switch triode are connected with the input end of the filter module (2).

7. The open loop isolated power supply generation circuit of claim 1, wherein: the transformer comprises a transformer isolation module (3), and is characterized by further comprising a filter module (2), wherein the input end of the filter module (2) is connected with the output end of the control switch module (1), and the output end of the filter module (2) is connected with the input end of the transformer isolation module (3).

8. The open loop isolated power supply generation circuit of claim 1, wherein: the transformer isolation module (3) comprises an isolation transformer, the primary side of the isolation transformer is connected with the control switch module (1), a plurality of output modules (4) are arranged, and the plurality of output modules (4) are connected with the secondary side of the isolation transformer.