Isolation drive circuit and power supply device
By combining flyback and forward modules in an isolated drive circuit, and utilizing coil coupling and waveform signals to manage energy flow, the problems of complex circuit design and high cost are solved, achieving the effects of simplified design and cost reduction.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHUHAI TITANS NEW POWER ELECTRONICS CO LTD
- Filing Date
- 2025-06-11
- Publication Date
- 2026-06-23
AI Technical Summary
Existing isolated drive power supplies have complex and costly circuit designs, mainly because they require additional demagnetizing windings to prevent core saturation in forward converters.
By employing a combination of flyback and forward modules, the first primary coil in the flyback module is coupled to the first secondary coil, and the energy is stored and released using waveform signals to eliminate magnetic flux, thus simplifying circuit design and reducing costs.
This achieves the effects of simplifying circuit design and reducing costs, avoiding the need for additional demagnetizing windings, and improving the stability and safety of the circuit.
Smart Images
Figure CN224401405U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of power supply technology, and includes, but is not limited to, an isolated drive circuit and a power supply device. Background Technology
[0002] With the rapid development of electronic power technology, various power supply devices have emerged, such as isolated drive power supplies that can be applied to the stand-up pneumatics scenario.
[0003] In related technologies, the isolated drive power supply can generally be equipped with a flyback circuit, a forward circuit, and a demagnetizing winding. Specifically, during the normal operation of the isolated drive power supply, the magnetic core of the transformer in the forward circuit may have residual magnetic flux. The demagnetizing winding can provide a demagnetizing path for the magnetic core and reset the residual magnetic flux through reverse current to prevent the magnetic core from saturating, thereby ensuring that the forward circuit can work normally.
[0004] It is evident that, in the relevant technical solutions, at least an additional demagnetizing winding is required on the basis of the forward converter circuit, resulting in a relatively complex circuit design and high cost for the isolated drive power supply. Utility Model Content
[0005] In view of this, the isolation drive circuit and power supply device provided in the embodiments of this application can simplify the circuit design of the isolation drive circuit and reduce its cost. The isolation drive circuit and power supply device provided in the embodiments of this application are implemented as follows:
[0006] A first aspect of the present application provides an isolation driving circuit, the isolation driving circuit including a flyback module and a forward module, the flyback module including a first primary coil, a first secondary coil and a first magnetic core;
[0007] The control terminal of the flyback module is used to input waveform signals. The first primary coil and the first secondary coil are coupled through the first magnetic core. The output terminal of the first secondary coil is connected to the input terminal of the forward converter. The forward converter is used to connect to the first load.
[0008] The flyback module is used to store energy in the first primary coil under the action of the waveform signal, and to release energy from the first primary coil to the first secondary coil under the action of the waveform signal, so as to supply power to the forward converter module and eliminate the magnetic flux generated by the first magnetic core.
[0009] The forward converter module is used to receive the energy released by the first stage coil and release energy to the first load.
[0010] Optionally, the flyback module further includes an excitation power supply, a switching transistor, and a first rectifier unit;
[0011] The positive terminal of the excitation power supply is connected to the first end of the first primary coil, the negative terminal of the excitation power supply is connected to the first terminal of the switching transistor, the second terminal of the switching transistor is connected to the second end of the first primary coil, and the third terminal of the switching transistor is used to input the waveform signal.
[0012] The first end of the first rectifier unit is connected to the first end of the first primary coil and the first input end of the forward converter, respectively; the second end of the first rectifier unit is connected to the second end of the first primary coil and the second input end of the forward converter, respectively.
[0013] The first end of the first primary coil and the second end of the first primary coil are terminals with the same name;
[0014] The switching transistor is used to turn on or off under the action of the waveform signal;
[0015] The excitation power supply is used to output electrical energy to the first primary coil when the switch is turned on, so that the first primary coil stores energy; and to stop outputting electrical energy to the first primary coil when the switch is turned off, so that the first primary coil releases energy to the first primary coil.
[0016] The first rectifier unit is used to enable the primary coil to output electrical energy when the switch is turned off, and to enable the primary coil to stop outputting electrical energy when the switch is turned on.
[0017] Optionally, the first rectifier unit includes a first diode and a first capacitor;
[0018] The positive terminal of the first diode is connected to the first end of the first primary coil and the first input terminal of the forward converter, respectively. The negative terminal of the first diode is connected to the first plate of the first capacitor, and the second plate of the first capacitor is connected to the second end of the first primary coil and the second input terminal of the forward converter, respectively.
[0019] Optionally, the flyback module further includes a filtering unit;
[0020] The first end of the filter unit is connected to the positive terminal of the excitation power supply, and the second end of the filter unit is connected to the second terminal of the switching transistor.
[0021] Optionally, the filtering unit includes a first resistor and a second capacitor;
[0022] The first end of the first resistor is connected to the positive terminal of the excitation power supply, the second end of the first resistor is connected to the second terminal of the switching transistor, and the second capacitor is connected in parallel with the first resistor;
[0023] The filtering unit also includes a second diode;
[0024] The positive terminal of the second diode is connected to the second terminal of the switching transistor, and the negative terminal of the second diode is connected to the second terminal of the first resistor.
[0025] Optionally, the flyback module further includes a waveform generator;
[0026] The output terminal of the waveform generator is connected to the third terminal of the switching transistor;
[0027] The waveform generator is used to output the waveform signal to the switching transistor to control the switching transistor to turn on or off. The waveform signal can be any of the following: square wave signal, sine wave signal, cosine wave signal, and triangle wave signal.
[0028] Optionally, the forward converter module includes a second primary coil and a second secondary coil, wherein the second primary coil is coupled to the second secondary coil;
[0029] The first end of the second primary coil is connected to the first end of the first primary coil, and the second end of the second primary coil is connected to the second end of the first primary coil; the first end of the second primary coil is the first input terminal of the forward converter module, the second end of the second primary coil is the second input terminal of the forward converter module, the first end of the second primary coil is the first output terminal of the forward converter module, and the second end of the second primary coil is the second output terminal of the forward converter module.
[0030] The first end of the second primary coil and the first end of the second secondary coil are of the same name.
[0031] The second primary coil is used to output electrical energy to the second secondary coil when it receives electrical energy from the first primary coil, and to stop outputting electrical energy to the second secondary coil when it does not receive electrical energy from the first primary coil.
[0032] The second-stage coil is used to receive the electrical energy output from the second primary coil and supply power to the first load.
[0033] Optionally, the forward converter module further includes a second rectifier unit;
[0034] The first end of the second rectifier unit is connected to the first end of the second stage coil, and the second end of the second rectifier unit is connected to the second end of the second stage coil.
[0035] The second rectifier unit is used to cause the second primary coil to output electrical energy when the second primary coil outputs electrical energy, and to cause the second primary coil to stop outputting electrical energy when the second primary coil stops outputting electrical energy.
[0036] Optionally, the second rectifier unit includes a third diode and a third capacitor;
[0037] The positive terminal of the third diode is connected to the first end of the second stage coil, the negative terminal of the third diode is connected to the first plate of the third capacitor, and the second plate of the third capacitor is connected to the second end of the second stage coil.
[0038] A second aspect of this application also provides a power supply device, the power supply device including any of the isolation drive circuits provided in the first aspect above.
[0039] The isolated drive circuit and power supply device provided in this application embodiment include a flyback module and a forward module in the isolated drive circuit, and a first primary coil, a first secondary coil, and a first magnetic core in the flyback module. A waveform signal is input to the control terminal of the flyback module. The first primary coil and the first secondary coil are coupled through the first magnetic core. The output terminal of the first secondary coil is connected to the input terminal of the forward module, which is used to connect a first load. The flyback module stores energy in the first primary coil under the action of the waveform signal, and releases energy from the first primary coil to the first secondary coil under the action of the waveform signal to power the forward module and eliminate the magnetic flux generated by the first magnetic core. The forward module can be any possible forward circuit. Besides a transformer, the forward module also includes any other possible components or units, such as an energy storage inductor, a freewheeling diode, etc. This application embodiment does not limit this.
[0040] Based on the description of the working principles of the flyback module and the forward module in the embodiments of this application, it can be seen that in the isolation drive circuit, when the first primary coil in the flyback module stores energy, the first primary coil is reverse-biased and cut off. Since the output terminal of the first primary coil is connected to the input terminal of the forward module, the forward module does not receive energy, and at this time, the forward module is in the off state. When the first primary coil is disconnected, the first primary coil begins to release energy, and the forward module receives the energy released by the first primary coil. At this time, the forward module is in the on state.
[0041] Furthermore, if the forward converter does not receive energy released from the primary winding, the energy not fully released by the second transformer can generate a reverse current path, which is then consumed through the primary winding and / or other components connected to the primary winding. This allows for flux reset of the second transformer in the forward converter.
[0042] Moreover, in the isolation drive circuit provided in this application, only the waveform signal needs to be input to the flyback module, while the forward module no longer needs to input the waveform signal separately.
[0043] In other words, in a circuit that has both a flyback module and a forward module, there is no need to set up a separate demagnetizing winding and input waveform signal channel for the forward module. The purpose of driving and / or exciting the forward module through the flyback module can be achieved, which has lower cost and simpler circuit design.
[0044] In this way, the circuit design of the isolation drive circuit can be simplified and the cost of the isolation drive circuit can be reduced, thus at least partially solving the technical problems mentioned in the background art. Attached Figure Description
[0045] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0046] Figure 1 This is a schematic diagram of the structure of the first type of isolated drive circuit provided in the embodiments of this application;
[0047] Figure 2 This is a schematic diagram of the structure of a second type of isolated driving circuit provided in an embodiment of this application;
[0048] Figure 3 This is a schematic diagram of the structure of the third type of isolation drive circuit provided in the embodiments of this application;
[0049] Figure 4 This is a schematic diagram of the structure of the fourth type of isolation drive circuit provided in the embodiments of this application. Detailed Implementation
[0050] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.
[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.
[0052] In the following description, references are made to “some embodiments,” which describe a subset of all possible embodiments. However, it is understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.
[0053] It should be noted that the terms "first, second, third" used in the embodiments of this application are used to distinguish similar or different objects and do not represent a specific order of objects. It can be understood that "first, second, third" can be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.
[0054] In related technologies, the isolated drive power supply can generally be equipped with a flyback circuit, a forward circuit, and a demagnetizing winding. Specifically, during the normal operation of the isolated drive power supply, the magnetic core of the transformer in the forward circuit may have residual magnetic flux. The demagnetizing winding can provide a demagnetizing path for the magnetic core and reset the residual magnetic flux through reverse current to prevent the magnetic core from saturating, thereby ensuring that the forward circuit can work normally.
[0055] It is evident that, in the relevant technical solutions, at least an additional demagnetizing winding is required on the basis of the forward converter circuit, resulting in a relatively complex circuit design and high cost for the isolated drive power supply.
[0056] To address this, embodiments of this application provide an isolated drive circuit. This circuit includes a flyback module and a forward module, with the flyback module comprising a first primary coil, a first secondary coil, and a first magnetic core. The control terminal of the flyback module is used to input a waveform signal. The first primary coil and the first secondary coil are coupled through the first magnetic core. The output terminal of the first secondary coil is connected to the input terminal of the forward module, which is used to connect to a first load. The flyback module, under the influence of the waveform signal, causes the first primary coil to store energy and, under the influence of the waveform signal, causes the first primary coil to release energy to the first secondary coil to power the forward module and eliminate the magnetic flux generated by the first magnetic core. The forward module receives the energy released by the first secondary coil and releases energy to the first load. This simplifies the circuit design of the isolated drive circuit and reduces its cost.
[0057] This application describes an example of an isolation drive circuit used in a power supply device for capacity testing. However, this does not imply that the embodiments of this application can only be applied to isolation drives in power supply devices, nor does it imply that the power supply device provided in this application can only be used for capacity testing.
[0058] The isolation drive circuit provided in the embodiments of this application will be explained in detail below.
[0059] Figure 1 This is a schematic diagram of an isolation drive circuit provided in this application. This isolation drive circuit can be applied to any possible power supply device. See also... Figure 1 This application provides an isolated driving circuit 100, which includes a flyback module 101 and a forward module 102. The flyback module 101 includes a first primary coil 1011, a first secondary coil 1012, and a first magnetic core 1013.
[0060] The control terminal of the flyback module 101 is used to input waveform signals. The first primary coil 1011 and the first secondary coil 1012 are coupled through the first magnetic core 1013. The output terminal of the first secondary coil 1012 is connected to the input terminal of the forward module 102, which is used to connect to the first load F1. Furthermore, the output terminal of the first secondary coil 1012 can also be connected to the second load F2, as detailed in [link to documentation]. Figure 1 The structure shown is not described in detail in the embodiments of this application.
[0061] In this embodiment, the coupling of the first primary coil 1011 and the first secondary coil 1012 through the first magnetic core 1013 means that the first primary coil 1011 and the first secondary coil 1012 can be connected to each other through a magnetic field based on the principle of electromagnetic induction and transfer energy.
[0062] The flyback module 101 is used to store energy in the first primary coil 1011 under the action of the waveform signal, and to release energy from the first primary coil 1011 to the first secondary coil under the action of the waveform signal, so as to supply power to the forward module 102 and eliminate the magnetic flux generated by the first magnetic core 1013.
[0063] In this embodiment, the flyback module 101 can refer to a switching power supply topology that can achieve energy isolation transmission through transformer energy storage. The first primary coil 1011, the first secondary coil 1012 and the first magnetic core 1013 in the flyback module 101 can form a first transformer. Moreover, the first primary coil 1011 on the primary side and the first secondary coil 1012 on the secondary side are alternately turned on.
[0064] Optionally, the flyback module 101 can be any possible flyback circuit. In addition to the first primary coil 1011, the first secondary coil 1012, and the first magnetic core 1013, the flyback module 101 may also include other possible components or units, such as electronic switches, control units, etc. This application embodiment does not limit this.
[0065] Generally, the function of the flyback module 101 provided in this application embodiment can be described as follows: when the electronic switch in the flyback module 101 is turned on under the action of the waveform signal, the first primary coil 1011 in the flyback module 101 stores energy, and the first primary coil 1012 in the flyback module 101 is reverse-cut off; when the electronic switch in the flyback module 101 is turned off under the action of the waveform signal, the first primary coil 1011 is disconnected, and the first primary coil 1012 begins to release energy.
[0066] In this embodiment, the waveform signal can be any possible signal such as a square wave, rectangular wave, cosine wave, sine wave, or triangular wave. This application does not limit this type of signal.
[0067] The forward converter module 102 is used to receive the energy released by the primary coil 1012 and release the energy to the first load F1.
[0068] In this embodiment, the forward converter 102 refers to an isolated switching power supply topology that can directly couple and transfer energy through a transformer. The forward converter 102 may also be provided with a second transformer, and the primary coil and the secondary coil of the second transformer are turned on and off simultaneously.
[0069] Optionally, the forward converter module 102 can be any possible forward converter circuit. In addition to the transformer, the forward converter module 102 also includes other possible components or units, such as energy storage inductors, freewheeling diodes, etc. This application embodiment does not limit this.
[0070] Generally, the function of the forward converter module 102 provided in this application embodiment can be described as follows: When the forward converter module 102 receives energy released by the first primary coil 1012 in the flyback module 101, the forward converter module 102 can use the second transformer to instantly transmit the received energy to the first load F1; when the forward converter module 102 does not receive energy released by the first primary coil 1012, the forward converter module 102 can continuously discharge to the first load F1 through the energy storage element provided on the secondary side of the second transformer; in addition, if no energy is stored in the energy storage element on the secondary side, the forward converter module 102 stops discharging to the first load F1.
[0071] It is worth noting that, based on the above description, the working principle of the isolation drive circuit 100 provided in the embodiments of this application will be briefly explained:
[0072] When the electronic switch in the flyback module 101 is initially turned on under the action of the waveform signal (that is, when the isolation drive circuit 100 is initially powered on), the first primary coil 1011 in the flyback module 101 stores energy, and the first primary coil 1012 in the flyback module 101 is reverse cut off. Since the output terminal of the first primary coil 1012 is connected to the input terminal of the forward module 102, the forward module 102 will not receive energy. At this time, the forward module 102 does not supply power to the first load F1.
[0073] When the electronic switch in the flyback module 101 is initially turned off under the action of this waveform signal, the first primary coil 1011 is disconnected, and the first secondary coil 1012 begins to release energy. Since the output terminal of the first primary coil 1012 is connected to the input terminal of the forward module 102, the forward module 102 will receive the energy released by the first primary coil 1012. At this time, the forward module 102 supplies power to the first load F1. If the forward module 102 is equipped with an energy storage element on the secondary side of the second transformer, the energy storage element can also be charged.
[0074] When the electronic switch in the flyback module 101 is turned back on under the action of the waveform signal, the first primary coil 1011 in the flyback module 101 continues to store energy, and the first primary coil 1012 re-enters the reverse cutoff state. Therefore, the forward module 102 does not receive energy and does not supply power to the first load F1. With this energy storage element in the forward module 102, since the energy storage element in the forward module 102 has already been charged, the forward module 102 can then continuously discharge to the first load F1 through this energy storage element.
[0075] In this way, the purpose of driving and / or stimulating the forward module 102 can be achieved through the flyback module 101.
[0076] It should be noted that, as described above, in the flyback module 101, during the energy storage process of the first primary coil 1011, the current flowing through the first primary coil 1011 increases linearly, causing the first magnetic core 1013 to also begin storing energy. At this time, the first primary coil 1012 is cut off and does not release energy, so the magnetic flux generated by the first magnetic core 1013 will continue to increase. After the first primary coil 1011 is disconnected, no current flows through the first primary coil 1011. At this time, the energy stored in the first magnetic core 1013 will be released through the first primary coil 1012. Therefore, the magnetic flux of the first magnetic core 1013 gradually returns to zero, completing the demagnetization of the first magnetic core 1013. In this way, the magnetic saturation of the first magnetic core 1013 can be avoided, and the magnetic flux can be completely reset in each cycle.
[0077] Furthermore, when the forward converter 102 receives energy released from the primary coil 1012 in the flyback converter 101, the second transformer in the forward converter 102 also begins to store energy, and at this time, the second transformer will continuously generate magnetic flux. However, when the forward converter 102 does not receive energy released from the primary coil 1012, the energy not fully released by the second transformer can generate a reverse current path, which is then consumed through the primary coil 1012 and / or the second load F2 connected to the primary coil 1012. In this way, the magnetic flux of the second transformer in the forward converter 102 can be reset.
[0078] In this embodiment, a flyback module 101 and a forward module 102 are configured in the isolation drive circuit 100. The flyback module 101 contains a first primary coil 1011, a first secondary coil 1012, and a first magnetic core 1013. A waveform signal is input to the control terminal of the flyback module 101. The first primary coil 1011 and the first secondary coil 1012 are coupled through the first magnetic core 1013. The output terminal of the first secondary coil 1012 is connected to the input terminal of the forward module 102, which is used to connect to a first load F1. The flyback module 101 stores energy in the first primary coil 1011 under the influence of the waveform signal and releases energy from the first primary coil 1011 to the first secondary coil under the influence of the waveform signal, thereby supplying power to the forward module 102 and eliminating the magnetic flux generated by the first magnetic core 1013. The forward converter module 102 can be any possible forward converter circuit. In addition to the transformer, the forward converter module 102 also includes other possible components or units, such as energy storage inductors, freewheeling diodes, etc. The embodiments of this application do not limit this.
[0079] Based on the description of the working principle of the flyback module 101 and the forward module 102 in the embodiments of this application, it can be seen that in the isolation drive circuit 100, when the first primary coil 1011 in the flyback module 101 stores energy, the first primary coil 1012 is reverse-biased and cut off. Since the output terminal of the first primary coil 1012 is connected to the input terminal of the forward module 102, the forward module 102 will not receive energy, and at this time, the forward module 102 is in the off state. When the first primary coil 1011 is disconnected, the first primary coil 1012 begins to release energy, and the forward module 102 will receive the energy released by the first primary coil 1012. At this time, the forward module 102 is in the on state.
[0080] Furthermore, if the forward converter 102 does not receive energy released by the primary coil 1012, the energy not fully released by the second transformer can generate a reverse current path, which is then consumed through the primary coil 1012 and / or other components connected to the primary coil 1012. This allows for flux reset of the second transformer in the forward converter 102.
[0081] Moreover, in the isolation drive circuit 100 provided in this application, only the waveform signal needs to be input to the flyback module 101, while the forward module 102 no longer needs to input the waveform signal separately.
[0082] In other words, in a circuit that simultaneously has a flyback module 101 and a forward module 102, there is no need to separately set up a demagnetizing winding and an input waveform signal channel for the forward module 102. The purpose of driving and / or exciting the forward module 102 through the flyback module 101 can be achieved, which has lower cost and simpler circuit design.
[0083] This simplifies the circuit design of the isolation drive circuit and reduces its cost.
[0084] In one possible implementation, see [link to relevant documentation]. Figure 2 The flyback module 101 also includes an excitation power supply B, a switching transistor M, and a first rectifier unit 1014.
[0085] The positive terminal of the excitation power supply B is connected to the first end of the first primary coil 1011, the negative terminal of the excitation power supply B is connected to the first terminal of the switching transistor M, the second terminal of the switching transistor M is connected to the second end of the first primary coil 1011, and the third terminal of the switching transistor M is used to input the waveform signal.
[0086] The first end of the first rectifier unit 1014 is connected to the first end of the first primary coil 1012 and the first input end of the forward converter module 102, respectively. The second end of the first rectifier unit 1014 is connected to the second end of the first primary coil 1012 and the second input end of the forward converter module 102, respectively.
[0087] In this embodiment, the first end of the first primary coil 1011 and the second end of the first primary coil 1012 are terminals with the same name. See also... Figure 2 The first end of the first primary coil 1011 is connected to the "+" terminal of the excitation power supply B, and the second end of the first primary coil 1012 is located at... Figure 2 The lower end, and, in Figure 2 In the middle, a hollow small circle is marked near the first end of the first primary coil 1011 and the second end of the first primary coil 1012.
[0088] "Same-name terminals" refers to two terminals in mutually inductant coils that always have the same actual polarity in the same way. That is, when the first terminal of the first primary coil 1011 is positive, the second terminal of the first primary coil 1012 is also positive.
[0089] The switching transistor M is used to turn on or off under the influence of the waveform signal. For example, when the voltage of the waveform signal is greater than or equal to the turn-on threshold of the switching transistor M, the switching transistor M can turn on; when the voltage of the waveform signal is less than the turn-on threshold of the switching transistor M, the switching transistor M can turn off. This application does not limit this aspect.
[0090] Optionally, the switching transistor M can be an N-channel switching transistor, such as an NMOS transistor, an N-channel IGBT, or any other possible electronic switch. This application does not limit this.
[0091] The excitation power supply B is used to output electrical energy to the first primary coil 1011 when the switch M is turned on, so that the first primary coil 1011 stores energy, and to stop outputting electrical energy to the first primary coil 1011 when the switch M is turned off, so that the first primary coil 1011 releases energy to the first primary coil 1012.
[0092] Optionally, the excitation power source B can be any possible power source, such as a DC battery, and this application embodiment does not limit this.
[0093] The first rectifier unit 1014 is used to enable the first primary coil 1012 to output electrical energy when the switch M is turned off, and to enable the first primary coil 1012 to stop outputting electrical energy when the switch M is turned on.
[0094] Optionally, the first rectifier unit 1014 may include any possible devices, such as diodes and capacitors. Generally, the first rectifier unit 1014 may have reverse current blocking and transient overvoltage protection functions. This application embodiment does not limit this aspect.
[0095] For example, in Figure 2 Based on this, continue to see Figure 3 The first rectifier unit 1014 may include a first diode D1 and a first capacitor C1.
[0096] The positive terminal of the first diode D1 is connected to the first end of the first primary coil 1012 and the first input terminal of the forward converter 102, respectively. The negative terminal of the first diode D1 is connected to the first plate of the first capacitor C1, and the second plate of the first capacitor C1 is connected to the second end of the first primary coil 1012 and the second input terminal of the forward converter 102, respectively.
[0097] Optionally, the first diode D1 can be a fast recovery diode, and the first capacitor C1 can be a filter capacitor.
[0098] It is worth noting that when the switch M is on, the first primary coil 1011 begins to store energy. Since the first terminal of the first primary coil 1011 and the second terminal of the first primary coil 1012 are of the same polarity, the induced voltage generated in the first primary coil 1012 is cut off by the first diode D1. At this time, the first primary coil 1012 does not release energy to the forward converter 102 and the second load F2. Conversely, when the switch M is off, the first primary coil 1011 is disconnected. Since the first terminal of the first primary coil 1011 and the second terminal of the first primary coil 1012 are of the same polarity, the induced voltage generated in the first primary coil 1012 causes the first diode D1 to conduct in the forward direction. At this time, the first primary coil 1012 begins to release energy to the forward converter 102 and the second load F2. Thus, based on the unidirectional conduction characteristic of the first diode D1, the first primary coil 1012 does not release energy during the energy storage process of the first primary coil 1011, ensuring the correct operation of the flyback converter 101.
[0099] In addition, the first capacitor C1 can absorb the pulse current during the conduction of the diode, maintain voltage stability during transients of the second load F2 and / or the forward converter 102, and suppress the output voltage ripple of the first primary coil 1012.
[0100] It is understandable that by incorporating an excitation power supply B, a switching transistor M, and a first rectifier unit 1014 including a first diode D1 and a first capacitor C1 into the flyback module 101, the flyback module 101 can operate correctly, maximizing the stability of the output voltage of the flyback module 101 and protecting the components within the flyback module 101 from damage. This, in turn, improves the stability and safety of the circuit 100.
[0101] In one possible implementation, see [link to previous section] Figure 3 The flyback module 101 also includes a filter unit L.
[0102] The first end of the filter unit L is connected to the positive terminal of the excitation power supply B, and the second end of the filter unit L is connected to the second terminal of the switching transistor M.
[0103] It is worth noting that the filter unit L can filter out noise in the voltage output from the excitation power supply B to the first primary coil 1011 as much as possible, thereby improving the stability of the circuit 100.
[0104] For example, in one possible manner, see [link to previous article]. Figure 3 The filter unit L may include at least a first resistor R1 and a second capacitor C2.
[0105] The first end of the first resistor R1 is connected to the positive terminal of the excitation power supply B, the second end of the first resistor R1 is connected to the second terminal of the switching transistor M, and the second capacitor C2 is connected in parallel with the first resistor R1.
[0106] It is worth noting that the filter unit L, through the synergistic effect of the first resistor R1 and the second capacitor C2, can achieve high-frequency noise suppression, filtering, transient voltage absorption, elimination of electrical sparks, waveform shaping, and circuit stabilization. This can further improve the stability and safety of the flyback module 101 and the circuit 100.
[0107] Additionally, see also Figure 3 The filter unit L may also include a second diode D2.
[0108] The positive terminal of the second diode D2 is connected to the second terminal of the switching transistor M, and the negative terminal of the second diode D2 is connected to the second terminal of the first resistor R1.
[0109] It is worth noting that in this case, the filter unit L can form an RCD absorption circuit. The working principle is roughly as follows: When the switch M is turned off, the leakage inductance energy of the first primary coil 1011 will generate a reverse high-voltage spike. At this time, the second diode D2 can conduct, directing the spike energy to the first resistor R1 and the second capacitor C2. The second capacitor C2 charges and stores the energy, while the first resistor R1 consumes the energy, thereby limiting the spike voltage within a safe range. Simultaneously, the second diode D2 ensures that the leakage inductance energy is not reverse-transmitted to the first primary coil 1011 or the aforementioned excitation power supply B, reducing the repeated conduction losses of the switch M. Furthermore, during the turn-off period of the switch M, the second diode D2 only allows energy to flow unidirectionally into the filter unit L, blocking the reverse discharge path of the second capacitor C2 to eliminate the risk of oscillation.
[0110] This improves the safety of the flyback module 101 and the circuit 100.
[0111] In one possible implementation, see [link to previous section] Figure 3 The flyback module 101 also includes a waveform generator.
[0112] The output terminal of the waveform generator is connected to the third terminal of the switching transistor M, which is the control terminal of the flyback module 101.
[0113] The waveform generator is used to output the waveform signal to the switch M to control the switch M to turn on or off.
[0114] It is understandable that the waveform generator can be used to generate corresponding waveform signals to adjust the switching timing of the switching transistor M, thereby achieving efficient transmission of the first transformer. Furthermore, the waveform generator can also be used to achieve soft start of the switching transistor M to avoid surge problems.
[0115] In one possible implementation, see [link to previous section] Figure 2 The forward converter module 102 includes a second primary coil 1021 and a second secondary coil 1022, with the second primary coil 1021 coupled to the second secondary coil 1022.
[0116] The first end of the second primary coil 1021 is connected to the first end of the first primary coil 1012, and the second end of the second primary coil 1021 is connected to the second end of the first primary coil 1012. The first end of the second primary coil 1021 is the first input terminal of the forward converter 102, and the second end of the second primary coil 1021 is the second input terminal of the forward converter 102. The first end of the second primary coil 1022 is the first output terminal of the forward converter 102, and the second end of the second primary coil 1022 is the second output terminal of the forward converter 102.
[0117] In this embodiment, the coupling between the second primary coil 1021 and the second secondary coil 1022 means that the second primary coil 1021 and the second secondary coil 1022 can be interconnected through a magnetic field based on the principle of electromagnetic induction and transfer energy. Moreover, the forward converter module 102 may also include a second magnetic core 1023, through which the second primary coil 1021 and the second secondary coil 1022 can be coupled.
[0118] In this embodiment, the first end of the second primary coil 1021 and the first end of the second secondary coil 1022 are of the same name. See also... Figure 2 A hollow small circle is marked near the first end of the second primary coil 1021 and the first end of the second secondary coil 1022.
[0119] Alternatively, the first end of the second primary coil 1021 can also be the same end as the second end of the first primary coil 1012.
[0120] The second primary coil 1021 is used to output electrical energy to the second primary coil 1022 when it receives electrical energy from the first primary coil 1012, and to stop outputting electrical energy to the second primary coil 1022 when it does not receive electrical energy from the first primary coil 1012.
[0121] The second primary coil 1022 is used to receive the electrical energy output from the second primary coil 1021 and supply power to the first load F1.
[0122] It is worth noting that, based on the above description and in conjunction with the working principles of the first primary coil 1011 and the first secondary coil 1012, the working principle of the forward converter module 102 provided in this application embodiment will be briefly explained:
[0123] When the switching transistor M in the flyback module 101 is turned on for the first time under the action of the waveform signal, the first primary coil 1011 stores energy and the first primary coil 1012 is reverse cut off. Since the first primary coil 1012 is connected to the second primary coil 1021, the second primary coil 1021 will not receive energy. At this time, the second primary coil 1022 does not supply power to the first load F1.
[0124] When the switching transistor M is initially turned off under the action of this waveform signal, the first primary coil 1011 is disconnected, and the first primary coil 1012 begins to release energy. Since the output terminal of the first primary coil 1012 is connected to the second primary coil 1021, the second primary coil 1021 will receive the energy released by the first primary coil 1012. At this time, the second primary coil 1021 stores energy, and the second primary coil 1022 supplies power to the first load F1. If the forward converter module 102 is equipped with an energy storage element on the secondary side of the second transformer, the second primary coil 1022 can also be charged by the energy storage element.
[0125] When the switching transistor M is turned on again under the action of the waveform signal, the first primary coil 1011 continues to store energy, and the first primary coil 1012 re-enters the reverse cutoff state. Therefore, the second primary coil 1021 will not receive energy, and the second primary coil 1022 will not supply power to the first load F1. When this energy storage element is provided in the forward converter 102, since the energy storage element has been previously charged, the forward converter 102 can continuously discharge to the first load F1 through this energy storage element.
[0126] In this way, the purpose of driving and / or stimulating the forward module 102 can be achieved through the flyback module 101.
[0127] In one possible implementation, see [link to previous section] Figure 2 The forward converter module 102 also includes a second rectifier unit 1024.
[0128] The first end of the second rectifier unit 1024 is connected to the first end of the second stage coil 1022, and the second end of the second rectifier unit 1024 is connected to the second end of the second stage coil 1022.
[0129] The second rectifier unit 1024 is used to enable the second primary coil 1022 to output electrical energy when the second primary coil 1021 outputs electrical energy, and to enable the second primary coil 1022 to stop outputting electrical energy when the second primary coil 1021 stops outputting electrical energy.
[0130] Optionally, the second rectifier unit 1024 may include any possible devices, such as diodes and capacitors. Generally, the second rectifier unit 1024 may have reverse current blocking and transient overvoltage protection functions. This application embodiment does not limit this.
[0131] For example, in Figure 2 Based on this, continue to see Figure 4 The second rectifier unit 1024 may include a third diode D3 and a third capacitor C3.
[0132] The positive terminal of the third diode D3 is connected to the first end of the second stage coil 1022, the negative terminal of the third diode D3 is connected to the first plate of the third capacitor C3, and the second plate of the third capacitor C3 is connected to the second end of the second stage coil 1022.
[0133] Optionally, the first diode D1 can be a fast recovery diode, and the first capacitor C1 can be a filter capacitor.
[0134] It is worth noting that when the first primary coil 1012 releases energy, the second primary coil 1021 begins to store energy. Since the first terminal of the second primary coil 1021 and the first terminal of the second primary coil 1022 are of the same polarity, the induced voltage generated in the second primary coil 1022 causes the third diode D3 to conduct in the forward direction. At this time, the second primary coil 1022 begins to release energy to the first load F1. Conversely, when the first primary coil 1012 stops releasing energy, the second primary coil 1021 is disconnected. Because the first terminal of the second primary coil 1021 and the first terminal of the second primary coil 1022 are of the same polarity, the induced voltage generated in the second primary coil 1022 is cut off by the third diode D3. At this time, the second primary coil 1022 does not release energy to the first load F1. Thus, based on the unidirectional conduction characteristic of the third diode D3, the second primary coil 1022 can synchronously release energy while the second primary coil 1021 is storing energy, ensuring the correct operation of the forward converter module 102.
[0135] In addition, the third capacitor C3 can absorb the pulse current during the conduction of the diode, maintain voltage stability during the transient of the first load F1, and suppress the output voltage ripple of the second stage coil 1022.
[0136] It is understandable that by setting a second rectifier unit 1024 in the forward converter module 102, the forward converter module 102 can operate correctly, the stability of the output voltage of the forward converter module 102 can be improved as much as possible, and the components in the forward converter module 102 can be protected from damage as much as possible. In turn, the stability and safety of the circuit 100 can be improved.
[0137] In one possible implementation, the forward converter module 102 also includes a freewheeling unit.
[0138] The freewheeling unit is connected to the secondary coil 1022 and the first load F1, respectively.
[0139] The freewheeling unit is used to store energy when the secondary coil 1022 outputs electrical energy, and to supply power to the first load F1 when the secondary coil 1022 stops outputting electrical energy.
[0140] In this embodiment, the freewheeling unit may include the energy storage element disposed on the secondary side of the second transformer in the forward converter module 102.
[0141] Optionally, the freewheeling unit may include at least one freewheeling inductor, at least one freewheeling diode, and / or at least one freewheeling MOSFET. Alternatively, the freewheeling unit may also be a freewheeling circuit composed of a corresponding clamping capacitor, MOSFET, and driving circuit; this embodiment of the application does not limit this.
[0142] In this way, even when the secondary coil 1022 stops outputting power, the energy stored in the freewheeling unit can continuously supply power to the first load F1, thereby ensuring the voltage of the first load F1 is continuous and the ripple is controllable. This improves the practicality and stability of the forward converter module 102 and the circuit 100.
[0143] Based on the foregoing embodiments, this application provides a power supply device, which includes the isolation drive circuit 100 provided in any of the above embodiments.
[0144] This application also provides a formation and capacity testing device, which may include at least the isolation drive circuit 100 provided in any of the above embodiments, or the power supply device provided in any of the above embodiments.
[0145] In addition, the formation and capacity testing equipment may also include any other possible devices or components such as a controller, a detection device, a switching device, and an amplifier. This application does not limit this aspect.
[0146] The above description of the embodiments of the power supply device and the formation and capacity testing device is similar to the description of the embodiments of the isolation drive circuit 100 described above, and has similar beneficial effects as the embodiments of the isolation drive circuit 100. For technical details not disclosed in the device embodiments of this application, please refer to the description of the embodiments of the isolation drive circuit 100 provided in this application for understanding.
[0147] Those skilled in the art will understand that the structure of the power supply device mentioned above is only a partial structure related to the solution of this application and does not constitute a limitation on the power supply device provided by the solution of this application. The specific power supply device may include more or fewer components than those listed above, or combine certain components, or have different component arrangements.
[0148] It should be understood that the phrases "one embodiment," "an embodiment," or "some embodiments" mentioned throughout the specification mean that a specific feature, structure, or characteristic related to an embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment," "in one embodiment," or "in some embodiments" appearing throughout the specification do not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that in the various embodiments of this application, the sequence numbers of the above-described processes do not imply a sequential order of execution; the execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application. The sequence numbers of the above-described embodiments are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments. The descriptions of the various embodiments above tend to emphasize the differences between the various embodiments; their similarities or commonalities can be referred to mutually, and for the sake of brevity, they will not be repeated here.
[0149] In this article, the term "and / or" is merely a description of the relationship between related objects, indicating that there can be three kinds of relationships. For example, object A and / or object B can represent three situations: object A exists alone, object A and object B exist simultaneously, and object B exists alone.
[0150] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0151] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The embodiments described above are merely illustrative. For example, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods, such as: multiple modules or components can be combined, or integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the various components shown or discussed can be through some interfaces, and the indirect coupling or communication connection between devices or modules can be electrical, mechanical, or other forms.
[0152] The modules described above as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules. They may be located in one place or distributed across multiple network units. Some or all of the modules may be selected to achieve the purpose of this embodiment according to actual needs.
[0153] In addition, each functional module in the various embodiments of this application can be integrated into one processing unit, or each module can be a separate unit, or two or more modules can be integrated into one unit; the integrated modules can be implemented in hardware or in the form of hardware plus software functional units.
[0154] The features disclosed in the several product embodiments provided in this application can be arbitrarily combined without conflict to obtain new product embodiments.
[0155] The above description is merely an embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
[0156] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An isolated drive circuit, characterized in that, The isolation drive circuit includes a flyback module and a forward module. The flyback module includes a first primary coil, a first secondary coil, and a first magnetic core. The control terminal of the flyback module is used to input waveform signals. The first primary coil and the first secondary coil are coupled through the first magnetic core. The output terminal of the first secondary coil is connected to the input terminal of the forward converter. The forward converter is used to connect to the first load. The flyback module is used to store energy in the first primary coil under the action of the waveform signal, and to release energy from the first primary coil to the first secondary coil under the action of the waveform signal, so as to supply power to the forward converter module and eliminate the magnetic flux generated by the first magnetic core. The forward converter module is used to receive the energy released by the first stage coil and release energy to the first load.
2. The isolated drive circuit as described in claim 1, characterized in that, The flyback module also includes an excitation power supply, a switching transistor, and a first rectifier unit; The positive terminal of the excitation power supply is connected to the first end of the first primary coil, the negative terminal of the excitation power supply is connected to the first terminal of the switching transistor, the second terminal of the switching transistor is connected to the second end of the first primary coil, and the third terminal of the switching transistor is used to input the waveform signal. The first end of the first rectifier unit is connected to the first end of the first primary coil and the first input end of the forward converter, respectively; the second end of the first rectifier unit is connected to the second end of the first primary coil and the second input end of the forward converter, respectively. The first end of the first primary coil and the second end of the first primary coil are terminals with the same name; The switching transistor is used to turn on or off under the action of the waveform signal; The excitation power supply is used to output electrical energy to the first primary coil when the switch is turned on, so that the first primary coil stores energy; and to stop outputting electrical energy to the first primary coil when the switch is turned off, so that the first primary coil releases energy to the first primary coil. The first rectifier unit is used to enable the primary coil to output electrical energy when the switch is turned off, and to enable the primary coil to stop outputting electrical energy when the switch is turned on.
3. The isolated drive circuit as described in claim 2, characterized in that, The first rectifier unit includes a first diode and a first capacitor; The positive terminal of the first diode is connected to the first end of the first primary coil and the first input terminal of the forward converter, respectively. The negative terminal of the first diode is connected to the first plate of the first capacitor, and the second plate of the first capacitor is connected to the second end of the first primary coil and the second input terminal of the forward converter, respectively.
4. The isolated drive circuit as described in claim 2, characterized in that, The flyback module also includes a filtering unit; The first end of the filter unit is connected to the positive terminal of the excitation power supply, and the second end of the filter unit is connected to the second terminal of the switching transistor.
5. The isolated drive circuit as described in claim 4, characterized in that, The filtering unit includes a first resistor and a second capacitor; The first end of the first resistor is connected to the positive terminal of the excitation power supply, the second end of the first resistor is connected to the second terminal of the switching transistor, and the second capacitor is connected in parallel with the first resistor; The filtering unit also includes a second diode; The positive terminal of the second diode is connected to the second terminal of the switching transistor, and the negative terminal of the second diode is connected to the second terminal of the first resistor.
6. The isolated drive circuit as described in claim 2, characterized in that, The flyback module also includes a waveform generator; The output terminal of the waveform generator is connected to the third terminal of the switching transistor; The waveform generator is used to output the waveform signal to the switching transistor to control the switching transistor to turn on or off. The waveform signal can be any one of the following: square wave signal, sine wave signal, cosine wave signal, and triangle wave signal.
7. The isolation drive circuit as described in any one of claims 1-6, characterized in that, The forward converter module includes a second primary coil and a second secondary coil, wherein the second primary coil is coupled to the second secondary coil. The first end of the second primary coil is connected to the first end of the first primary coil, and the second end of the second primary coil is connected to the second end of the first primary coil; the first end of the second primary coil is the first input terminal of the forward converter module, the second end of the second primary coil is the second input terminal of the forward converter module, the first end of the second primary coil is the first output terminal of the forward converter module, and the second end of the second primary coil is the second output terminal of the forward converter module. The first end of the second primary coil and the first end of the second secondary coil are of the same name. The second primary coil is used to output electrical energy to the second secondary coil when it receives electrical energy from the first primary coil, and to stop outputting electrical energy to the second secondary coil when it does not receive electrical energy from the first primary coil. The second-stage coil is used to receive the electrical energy output from the second primary coil and supply power to the first load.
8. The isolated drive circuit as described in claim 7, characterized in that, The forward converter module also includes a second rectifier unit; The first end of the second rectifier unit is connected to the first end of the second stage coil, and the second end of the second rectifier unit is connected to the second end of the second stage coil. The second rectifier unit is used to cause the second primary coil to output electrical energy when the second primary coil outputs electrical energy, and to cause the second primary coil to stop outputting electrical energy when the second primary coil stops outputting electrical energy.
9. The isolated drive circuit as described in claim 8, characterized in that, The second rectifier unit includes a third diode and a third capacitor; The positive terminal of the third diode is connected to the first end of the second stage coil, the negative terminal of the third diode is connected to the first plate of the third capacitor, and the second plate of the third capacitor is connected to the second end of the second stage coil.
10. A power supply device, characterized in that, Includes the isolation drive circuit described in any one of claims 1-9.