Power converter and power supply equipment

Abstract

The invention provides a power converter and power supply equipment. The power converter realizes secondary communication between a primary side control module and a secondary side control module through a transformer and an optocoupler; the secondary side control module is configured to output a first signal through the optocoupler output module when the load of the output end of the secondary side circuit changes, and send a confirmation response signal to the secondary side control module when receiving the coded signal; the optocoupler receiving module changes the voltage value of the second end of the primary side control module based on the first signal; the primary side control module transmits a coding signal to the transformer according to a voltage value, corresponding to the first signal, of the second end of the primary side control module; and controlling the working state of the power converter according to the voltage value of the second end of the primary side control module corresponding to the confirmation response signal. Therefore, when the load state changes, the working state of the power converter can be accurately and stably controlled.

Description

Technical Field

[0001] The present invention relates to the field of power supplies, and in particular to a power converter and power supply equipment. Background Art

[0002] Power converters are commonly used in power adapters to provide power to battery-powered devices.

[0003] The primary side control module and the secondary side control module of the existing power converter usually feed back the status of the secondary side control module to the primary side control module through unidirectional communication. However, this communication method may cause the power converter to erroneously enter the zero power consumption mode or the normal working mode.

[0004] Therefore, how to accurately control the working state of the power converter has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The present invention provides a power converter, which solves the technical problem that the working state of the power converter cannot be accurately controlled when the load state of the power converter changes.

[0006] According to a first aspect of the present invention, an embodiment of the present invention provides a power converter, comprising: a primary circuit, a transformer, and a secondary circuit; power and signals are transmitted between the primary circuit and the secondary circuit via the transformer;

[0007] The primary circuit includes a primary side control module, a first switch tube and an optocoupler receiving module, and the secondary circuit includes an optocoupler output module and a secondary side control module; wherein,

[0008] The first end of the primary side control module is coupled to the control end of the first switch tube, the first end of the first switch tube is coupled to the first end of the transformer, and the second end of the first switch tube is grounded; the second end of the primary side control module is coupled to the first end of the optical coupling receiving module, the third end of the primary side control module is grounded, and the second end of the optical coupling receiving module is grounded;

[0009] The second end of the transformer is coupled to the first end of the optical coupling output module and the first end of the secondary side control module respectively, the second end of the secondary side control module is coupled to the second end of the optical coupling output module, the third end of the secondary side control module is coupled to the output end of the secondary side circuit, and the fourth end of the secondary side control module is coupled to the third end of the transformer or the second end of the transformer to receive the fourth end of the coded signal transmitted by the primary side circuit;

[0010] The secondary-side control module is configured to: output a first signal through the optocoupler output module when a load at the output end of the secondary circuit changes; and

[0011] When the coded signal is received, a confirmation response signal is sent through the optical coupler output module, wherein the confirmation response signal is used to indicate that the secondary circuit is in a normal working state;

[0012] The optical coupler receiving module is configured to: change the voltage value of the second end of the primary side control module based on the first signal and the confirmation response signal;

[0013] The primary-side control module is configured to: transmit the coded signal to the transformer according to a voltage value of the second terminal of the primary-side control module corresponding to the first signal; and

[0014] The working state of the power converter is controlled according to the voltage value of the second terminal of the primary-side control module corresponding to the confirmation response signal.

[0015] Optionally, the working state of the power converter includes a zero power consumption state and a normal working state, and controlling the working state of the power converter according to the voltage value of the second end of the primary side control module corresponding to the confirmation response signal includes:

[0016] When the voltage value of the second end of the primary-side control module corresponding to the confirmation response signal is greater than a first set voltage value, controlling the power converter to enter a zero power consumption state or a normal working state;

[0017] When the voltage value of the second end of the primary-side control module corresponding to the confirmation response signal is less than a first set voltage value, the power converter is controlled to enter a normal working state or a zero power consumption state.

[0018] Optionally, the secondary circuit further includes a first resistor, a first end of the first resistor is coupled to the second end of the optocoupler output end, and a second end of the first resistor is coupled to the first end of the secondary side control module.

[0019] Optionally, the secondary circuit also includes a voltage stabilizing unit, a first end of the voltage stabilizing unit is respectively coupled to the second end of the secondary side control module and the second end of the optocoupler output module, and a second end of the voltage stabilizing unit is coupled to the fifth end of the secondary side control module.

[0020] Optionally, the voltage stabilizing unit includes a first voltage stabilizing subunit, including: a first voltage stabilizing resistor and a first voltage stabilizing capacitor;

[0021] The first end of the first voltage-stabilizing resistor is coupled to the second end of the secondary-side control module and the second end of the optocoupler output module respectively, the second end of the first voltage-stabilizing resistor is coupled to the first end of the first voltage-stabilizing capacitor, and the second end of the first voltage-stabilizing capacitor is coupled to the fifth end of the secondary-side control module.

[0022] Optionally, the voltage stabilizing unit further includes a second voltage stabilizing subunit, and the second voltage stabilizing subunit includes: a second voltage stabilizing resistor and a second voltage stabilizing capacitor;

[0023] The first end of the second voltage-stabilizing resistor is respectively coupled to the second end of the secondary-side control module and the second end of the optocoupler output module, the second end of the second voltage-stabilizing resistor is coupled to the first end of the first voltage-stabilizing capacitor, and the second end of the first voltage-stabilizing capacitor is coupled to the sixth end of the secondary-side control module.

[0024] Optionally, the secondary circuit further includes a first diode, an anode of the first diode is coupled to the ground terminal of the secondary side control module, and a cathode of the first diode is respectively coupled to the third terminal of the transformer and the fourth terminal of the secondary side control module.

[0025] Optionally, the secondary circuit further includes a first voltage-dividing resistor and a second voltage-dividing resistor;

[0026] The first end of the first voltage-dividing resistor is respectively coupled to the third end of the transformer and the cathode of the first diode, the second end of the first voltage-dividing resistor is respectively coupled to the first end of the second voltage-dividing resistor and the fourth end of the secondary sub-control module, and the second end of the second voltage-dividing resistor is coupled to the ground end of the secondary side control module and the anode of the first diode.

[0027] Optionally, the secondary circuit further includes a second diode, the anode of the second diode is respectively coupled to the second end of the transformer and the fourth end of the secondary side control module, and the cathode of the second diode is coupled to the first end of the secondary side control module.

[0028] Optionally, the secondary circuit further includes a third voltage-dividing resistor and a fourth voltage-dividing resistor;

[0029] The first end of the third voltage-dividing resistor is respectively coupled to the second end of the transformer and the positive electrode of the second diode, the second end of the third voltage-dividing resistor is respectively coupled to the first end of the fourth voltage-dividing resistor and the fourth end of the secondary sub-control module, and the second end of the fourth voltage-dividing resistor is respectively coupled to the ground end of the secondary side control module and the third end of the transformer.

[0030] Optionally, the primary side control module further includes a pull-up resistor and a primary side control unit;

[0031] The first end of the pull-up resistor is respectively coupled to the second end of the primary side control module, the second end of the pull-up resistor receives a first set voltage, the third end of the pull-up resistor is coupled to the first end of the primary side control unit, and the second end of the primary side control unit is coupled to the first end of the primary side control module.

[0032] Optionally, the primary side control module further includes a pull-down resistor and a primary side control unit;

[0033] The first end of the pull-down resistor is respectively coupled to the second end of the primary side control module, the second end of the pull-down resistor receives a first set voltage, the third end of the pull-down resistor is coupled to the first end of the primary side control unit, and the second end of the primary side control unit is coupled to the first end of the primary side control module. According to the second aspect of the present invention, an embodiment of the present invention provides a power supply device, including the power converter provided by the first aspect of the present invention.

[0034] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0035] The present invention provides a power converter and power supply equipment, in which a transformer and an optical coupler are used to realize secondary communication between a primary side control module and a secondary side control module; the secondary side control module is configured to output a first signal through an optical coupler output module when the load at the output end of the secondary side circuit changes, and to send a confirmation response signal to the secondary side control module when receiving a coded signal; the optical coupler receiving module changes the voltage value of the second end of the primary side control module based on the first signal; the primary side control module transmits a coded signal to the transformer according to the voltage value of the second end of the primary side control module corresponding to the first signal; and controls the working state of the power converter according to the voltage value of the second end of the primary side control module corresponding to the confirmation response signal. Thus, the present invention can realize accurate and stable control of the working state of the power converter when the load state changes. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 is a schematic structural diagram of a power converter according to a first embodiment of the present invention;

[0038] Figure 2is a schematic structural diagram of a power converter according to a second embodiment of the present invention;

[0039] Figure 3 is a schematic structural diagram of a power converter according to a third embodiment of the present invention;

[0040] Figure 4 is a schematic structural diagram of a power converter according to a fourth embodiment of the present invention;

[0041] Figure 5 is a schematic structural diagram of a power converter according to a fifth embodiment of the present invention;

[0042] Figure 6 The power converter structure of the sixth embodiment of the present invention is Figure 5 picture;

[0043] Figure 7 is a schematic structural diagram of a power converter according to a seventh embodiment of the present invention;

[0044] Figure 8 is a schematic structural diagram of a power converter according to an eighth embodiment of the present invention;

[0045] Fig. 9 is a schematic structural diagram of a power converter according to a ninth embodiment of the present invention;

[0046] Fig.10 is a schematic structural diagram of a power converter according to a tenth embodiment of the present invention;

[0047] Fig.11 is a schematic structural diagram of a power converter according to an eleventh embodiment of the present invention;

[0048] Fig.12 is a schematic diagram of control waveforms of a power converter according to an embodiment of the present invention;

[0049] Fig.13 It is a structural schematic diagram of a power supply device according to an embodiment of the present invention. Description of the drawings:

[0051] 10- Transformer;

[0052] 21-primary side control module;

[0053] 211-primary side control unit;

[0054] 22- Optocoupler receiving module;

[0055] 31- Secondary side control module;

[0056] 32- Optocoupler output module;

[0057] 23-AC / DC conversion circuit;

[0058] 24-Power grid;

[0059] C-filter capacitor;

[0060] OUT-first terminal of the primary side control module;

[0061] FB-second terminal of the primary side control module;

[0062] VPWR-first terminal of the secondary side control module;

[0063] OPTO - the second terminal of the secondary side control module;

[0064] VBUS-the third terminal of the secondary side control module;

[0065] VDS-the fourth terminal of the secondary side control module;

[0066] CVCV-the fifth terminal of the secondary side control module;

[0067] CC-the sixth terminal of the secondary side control module. DETAILED DESCRIPTION

[0068] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0069] The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0070] The technical solution of the present invention is described in detail with specific embodiments below. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0071] As described in the background technology, the primary side control module and the secondary side control module of the existing power converter usually feedback the status of the secondary side control module to the primary side control module through one-way communication, without performing secondary communication to confirm the status of the secondary side control module received by the primary side, resulting in the primary side control module being unable to accurately control the working state of the power converter.

[0072] In order to solve the above problems, the present invention provides a power converter and power supply equipment, in which a transformer and an optical coupler are used to realize secondary communication between a primary side control module and a secondary side control module; the secondary side control module is configured to output a first signal through an optical coupler output module when the load at the output end of the secondary side circuit changes, and to send a confirmation response signal to the secondary side control module when receiving a coded signal; the optical coupler receiving module changes the voltage value of the second end of the primary side control module based on the first signal; the primary side control module transmits a coded signal to the transformer according to the voltage value of the second end of the primary side control module corresponding to the first signal; and controls the working state of the power converter according to the voltage value of the second end of the primary side control module corresponding to the confirmation response signal. Thereby, the working state of the power converter can be accurately and stably controlled when the load state changes.

[0073] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0074] Please refer to Figure 1 , an embodiment of the present invention provides a power converter, comprising: a primary circuit, a transformer 10 and a secondary circuit; the primary circuit and the secondary circuit transmit electric energy and signals through the transformer 10;

[0075] The primary circuit includes a primary side control module 21, a first switch tube S1 and an optocoupler receiving module 22, and the secondary circuit includes a secondary side control module 31 and an optocoupler output module 32; wherein:

[0076] The first terminal OUT of the primary side control module 21 is coupled to the control terminal of the first switch tube S1, the first terminal of the first switch tube S1 is coupled to the first terminal of the transformer 10, and the second terminal of the first switch tube S1 is grounded; the second terminal FB of the primary side control module 21 is coupled to the first terminal of the optical coupling receiving module 22, and the second terminal of the optical coupling receiving module 22 is grounded;

[0077] The second end of the transformer 10 is coupled to the first end of the optical coupling output module 32 and the first end VPWR of the secondary side control module 31 respectively, the second end OPTO of the secondary side control module 31 is coupled to the second end of the optical coupling output module 32, the third end VBUS of the secondary side control module 31 is coupled to the output end Vout of the secondary side circuit, the fourth end VDS of the secondary side control module 31 is coupled to the third end of the transformer or the second end of the transformer, and the fourth end VDS is used to receive the coded signal transmitted by the primary side circuit;

[0078] The secondary-side control module 31 is configured to: output a first signal through the optical coupler output module 32 when a load at the output terminal Vout of the secondary circuit changes; and

[0079] When the coded signal is received, a confirmation response signal is sent through the optical coupler output module 32, and the confirmation response signal is used to indicate that the secondary circuit is in a normal working state;

[0080] The optical coupler receiving module 22 is configured to: change the voltage value of the second terminal FB of the primary side control module 21 based on the first signal and the confirmation response signal;

[0081] The primary-side control module 21 is configured to: transmit the coded signal to the transformer 10 according to the voltage value of the second terminal FB of the primary-side control module 21 corresponding to the first signal; and

[0082] The working state of the power converter is controlled according to the voltage value of the second terminal FB of the primary-side control module 21 corresponding to the confirmation response signal.

[0083] In summary, in the power converter, secondary communication between the primary side control module and the secondary side control module is achieved through the transformer and the optocoupler, so that the primary side control module 21 can accurately and stably control the working state of the power converter when the load state changes.

[0084] For details, please continue to refer to Figure 1 , in one embodiment, the working state of the power converter includes a zero power consumption state and a normal working state;

[0085] In this case, controlling the working state of the power converter according to the voltage value of the second terminal FB of the primary side control module 21 corresponding to the confirmation response signal includes:

[0086] When the voltage value of the second terminal FB of the primary-side control module 21 corresponding to the confirmation response signal is greater than the first set voltage value V1, the power converter is controlled to enter a zero power consumption state or a normal working state;

[0087] When the voltage value of the second terminal FB of the primary-side control module 21 corresponding to the confirmation response signal is less than the first set voltage value V1, the power converter is controlled to enter a normal working state or a zero power consumption state.

[0088] Among them, when the voltage value of the second end FB of the primary side control module 21 corresponding to the confirmation response signal is less than the first set voltage value V1, it can be understood that the load connection state of the output end of the secondary circuit is a power supply state or a non-working state, and the power converter is controlled to enter a normal working state or a zero power consumption state.

[0089] In actual use, please refer to Figure 2 The secondary circuit further includes a first resistor R1 , a first end of the first resistor R1 is coupled to the second end of the optocoupler output end, and a second end of the first resistor R1 is coupled to the first end VPWR of the secondary side control module 31 .

[0090] The first resistor is used to limit the current flowing through the optocoupler output unit.

[0091] In actual use, please refer to Figure 3 The secondary circuit also includes a voltage stabilizing unit 33, a first end of the voltage stabilizing unit 33 is respectively coupled to the second end OPTO of the secondary side control module 31 and the second end of the optocoupler output module 32, and a second end of the voltage stabilizing unit 33 is coupled to the fifth end CV of the secondary side control module 31.

[0092] The voltage stabilizing unit 33 is used to stabilize the voltage outputted from the secondary-side control module 31 to the optical coupling output unit 33 .

[0093] For a specific implementation, please refer to Figure 4 , the voltage stabilizing unit 31 includes a first voltage stabilizing subunit, and the first voltage stabilizing subunit includes: a first voltage stabilizing resistor R2 and a first voltage stabilizing capacitor C2;

[0094] The first end of the first voltage-stabilizing resistor R2 is respectively coupled to the second end OPTO of the secondary-side control module 31 and the second end of the optocoupler output module 32, the second end of the first voltage-stabilizing resistor R2 is coupled to the first end of the first voltage-stabilizing capacitor C2, and the second end of the first voltage-stabilizing capacitor C2 is coupled to the fifth end CV of the secondary-side control module 31.

[0095] In a preferred embodiment, please refer to Figure 5, the voltage stabilizing unit further includes a second voltage stabilizing subunit, the second voltage stabilizing subunit includes: a second voltage stabilizing resistor R3 and a second voltage stabilizing capacitor C3;

[0096] The first end of the second voltage-stabilizing resistor R3 is respectively coupled to the second end OPTO of the secondary-side control module 31, the second end of the optocoupler output module 32 and the first end of the first voltage-stabilizing resistor R2, the second end of the second voltage-stabilizing resistor R3 is coupled to the first end of the second voltage-stabilizing capacitor C3, and the second end of the second voltage-stabilizing capacitor C3 is coupled to the sixth end CC of the secondary-side control module 31.

[0097] By adding the second voltage stabilizing subunit, the voltage stabilizing unit 33 can stabilize the voltage output from the secondary side control chip 31 to the optical coupling output module 32 through the second voltage stabilizing subunit when the first voltage stabilizing subunit fails.

[0098] In practical applications, please refer to Figure 6 The secondary circuit also includes a first diode D1, the anode of the first diode D1 is respectively coupled to the fourth end VDS ground terminal of the secondary side control module 31, and the cathode of the first diode D1 is respectively coupled to the third end of the transformer and the fourth end VDS of the secondary side control module 31.

[0099] The first diode D1 is used for synchronous rectification.

[0100] In this case, a preferred implementation is as follows: Figure 7 , the secondary circuit also includes a first voltage-dividing resistor R4 and a second voltage-dividing resistor R5;

[0101] The first end of the first voltage-dividing resistor R4 is respectively coupled to the third end of the transformer 10 and the cathode of the first diode D1, the second end of the first voltage-dividing resistor R4 is respectively coupled to the first end of the second voltage-dividing resistor R5 and the fourth end VDS of the secondary-side control module 31, and the second end of the second voltage-dividing resistor R5 is coupled to the fourth end ground VDS of the secondary-side control module 31 and the anode of the first diode D1.

[0102] The first voltage-dividing resistor R4 and the second voltage-dividing resistor R5 are used to limit the voltage flowing to the secondary-side control module 31 .

[0103] Of course, the present invention does not limit the placement position of the first diode D1. In another optional implementation, please refer to Figure 8The secondary circuit also includes a second diode D2, the anode of the second diode D2 is respectively coupled to the second end of the transformer 10 and the fourth end of the secondary side control module, and the cathode of the second diode D2 is coupled to the first end VPWR of the secondary side control module 31.

[0104] It should be understood that the function of the second diode D2 is the same as that of the first diode D1.

[0105] In this case, the fourth terminal VDS1 of the secondary-side control module 31 is coupled to the second terminal of the transformer 10 for receiving the coding signal.

[0106] Figure 8 The rest of the circuit shown is similar to Figure 6 The same is not repeated here.

[0107] On the basis that the anode of the second diode D2 is respectively coupled to the second end of the transformer 10 and the fourth end of the secondary side control module 31, and the cathode of the second diode D2 is coupled to the first end VPWR of the secondary side control module 31, in a preferred embodiment, please refer to Fig. 9 , the secondary circuit also includes a third voltage-dividing resistor R6 and a fourth voltage-dividing resistor R7;

[0108] The first end of the third voltage-dividing resistor is respectively coupled to the second end of the transformer 10 and the positive electrode of the second diode D2, the second end of the third voltage-dividing resistor R6 is respectively coupled to the first end of the fourth voltage-dividing resistor R7 and the fourth end VDS of the secondary sub-control module 31, and the second end of the fourth voltage-dividing resistor R7 is respectively coupled to the fourth end VDS ground end of the secondary side control module 31 and the third end of the transformer 10.

[0109] The third voltage-dividing resistor R6 and the fourth voltage-dividing resistor R7 have the same functions as the first voltage-dividing resistor R4 and the second voltage-dividing resistor R5. Fig. 9 The rest of the circuit shown is similar to Figure 7 The same is not repeated here.

[0110] The internal structure of the primary side control module 21 is now further described:

[0111] In one implementation, please refer to Fig.10 , the primary side control module 21 further includes a pull-up resistor R8 and a primary side control unit 211;

[0112] The first end of the pull-up resistor R8 is respectively coupled to the second end FB of the primary side control module 21, the second end of the pull-up resistor R8 receives the first set voltage V1, the third end of the pull-up resistor R8 is coupled to the first end of the primary side control unit 211, and the second end of the primary side control unit 211 is coupled to the first end OUT of the primary side control module;

[0113] The pull-up resistor R8 is used to stabilize the second end of the primary side control module at a first set voltage when the second end receives the first signal and the confirmation response signal.

[0114] In this case, if the first signal indicates that the load has changed, the voltage value of the second terminal of the primary-side control unit may be increased or decreased, thereby causing the primary-side control unit to transmit the coded signal to the transformer;

[0115] If the confirmation response signal indicates that the secondary circuit is operating normally, the voltage value at the second end of the primary side control module can be made to rise or fall again, so that the voltage value at the second end of the primary side control module is greater than or less than the first set voltage value, thereby controlling the power converter to enter a zero power consumption state or a normal operating state.

[0116] Of course, the present invention is not limited to this. In another specific implementation, please refer to Fig.11 , the primary side control module 21 further includes a pull-down resistor R9 and a primary side control unit 211;

[0117] The first end of the pull-down resistor R9 is respectively coupled to the second end FB of the primary side control module 21, the second end of the pull-down resistor R9 receives the first set voltage V1, the third end of the pull-down resistor R9 is coupled to the first end of the primary side control unit 211, and the second end of the primary side control unit 211 is coupled to the first end OUT of the primary side control module 21.

[0118] Fig.11 The rest of the circuit shown is similar to Fig.10 The same is not repeated here.

[0119] The pull-down resistor R9 is used to stabilize the second end of the primary side control module at a first set voltage when the second end does not receive the first signal and the confirmation response signal.

[0120] in, Fig.11 The circuit and Fig.10 The circuit working principle is the same and will not be repeated here.

[0121] Now combined Fig.10 The circuit and Fig.12The control waveform of the power converter shown in FIG. 1 is used to further introduce the working process of the present invention. Fig.12 In the example, the working state of the power converter includes: a normal working state, a process of entering a zero power consumption state, a zero power consumption state, a process of exiting a zero power consumption state, and a normal working state.

[0122] The connection status of the load includes: power supply required state and power supply not required state.

[0123] OPTO(IO) can be understood as the first signal output by the optocoupler output module 32 .

[0124] FB(IO) can be understood as the first signal received by the optocoupler receiving module 22 and fed back to the second end of the primary-side control module 21 .

[0125] VDS(IN) can be understood as the coded signal received by the fourth terminal of the secondary-side control module 31 .

[0126] Among them, Fig.12 In the example, at time t1, the connection state of the load changes from a state requiring power supply to a state not requiring power supply;

[0127] During the time period t1 to t2, the secondary-side control module 31 identifies a load change at the output terminal Vout of the secondary-side circuit;

[0128] During the time period t2 to t3, the secondary-side control module 31 outputs the first signal through the optical coupling output module 32 based on the load change of the output terminal Vout of the secondary circuit, and the optical coupling receiving module 22 pulls the voltage of the second terminal FB of the primary-side control module 21 up to a voltage greater than the first set voltage according to the first signal;

[0129] Time period t3-t4: delay state before the primary side control module 21 transmits the coded signal to the transformer 10;

[0130] During the time period t4 to t5, the primary-side control module 21 transmits the coding signal to the transformer 10, and the fourth terminal of the secondary-side control module 31 receives the coding signal;

[0131] During the time period t5 to t6, the secondary-side control module 31 is in a delay state before sending a confirmation response signal to the optical coupling output module 32;

[0132] In the time period t6 to t7, a confirmation response signal is sent to the optical coupler output module 32, wherein the confirmation response signal is used to indicate that the secondary circuit is in a normal working state, and the second terminal FB of the primary side control module 21 receives the confirmation response signal;

[0133] At time t7, the optical coupler receiving module 22 pulls up the voltage of the second terminal FB of the primary side control module 21 based on the confirmation response signal, and the primary side control module 21 controls the power transformer to enter a zero power consumption state;

[0134] During the time period from t7 to t8, the power converter is in a zero power consumption state.

[0135] After t8, the connection state of the load changes from a state requiring power supply to a state requiring power supply, and secondary communication between the primary-side control module 21 and the secondary-side control module 31 is realized through the transformer 10 and the optocoupler, so as to control the power converter to enter a normal working state.

[0136] It can be seen that by realizing secondary communication between the primary-side control module 21 and the secondary-side control module 31 through the transformer 10 and the optocoupler, the present invention can accurately and stably control the working state of the power converter when the load state changes.

[0137] It should be understood that, in another implementation, during the process of entering the zero power consumption state, the voltage at the second end of the primary side control module 21 may be pulled down to be less than the first set voltage, but the present invention is not limited thereto.

[0138] Of course, the secondary communication of the present invention can also be used in the event of a power converter failure. For example, the secondary side control module can also be configured to detect whether a secondary circuit failure occurs. In the event of a secondary circuit failure, secondary communication is achieved between the secondary side control module and the primary side control module through a transformer and an optocoupler, so that the primary side control module can accurately and stably control the working state of the power converter.

[0139] Of course, the present invention is not limited thereto, and can also be used for secondary communication when the circuit appears in other states. Those skilled in the art can select a suitable scenario for secondary communication as needed.

[0140] In addition, please refer to Fig.13 An embodiment of the present invention further provides a power supply device, which includes the above-mentioned power converter.

[0141] In the case where the power converter of the present invention is an AC / DC converter, please continue to refer to Fig.13 In actual use, the power supply device further includes an AC / DC conversion circuit 23 and a filter circuit. The AC / DC conversion circuit 23 is, for example, a rectifier circuit composed of a diode. The AC / DC conversion circuit 23 is used to connect to the power grid 24 to convert the AC power in the power grid 24 into DC power. The filter circuit includes a filter capacitor C, which is used to filter the noise in the AC / DC conversion circuit 23 and the power converter.

[0142] Although the present invention is disclosed as above, the present invention is not limited thereto. The power converter of the present invention may also be a DC / DC converter. Those skilled in the art may select a suitable converter type as needed.

[0143] In summary, the present invention provides a power converter, which realizes secondary communication between a primary side control module and a secondary side control module through a transformer and an optocoupler; the secondary side control module is configured to output a first signal through an optocoupler output module when the load at the output end of the secondary side circuit changes, and to send a confirmation response signal to the secondary side control module when receiving a coded signal; the optocoupler receiving module changes the voltage value of the second end of the primary side control module based on the first signal; the primary side control module transmits a coded signal to the transformer according to the voltage value of the second end of the primary side control module corresponding to the first signal; and controls the working state of the power converter according to the voltage value of the second end of the primary side control module corresponding to the confirmation response signal. Thus, the present invention can realize accurate and stable control of the working state of the power converter when the load state changes.

[0144] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. A power converter, characterized in that: include: A primary circuit, a transformer and a secondary circuit; power and signals are transmitted between the primary circuit and the secondary circuit via the transformer; The primary circuit includes a primary side control module, a first switch tube and an optocoupler receiving module, and the secondary circuit includes an optocoupler output module and a secondary side control module; wherein, The first end of the primary side control module is coupled to the control end of the first switch tube, the first end of the first switch tube is coupled to the first end of the transformer, and the second end of the first switch tube is grounded; the second end of the primary side control module is coupled to the first end of the optical coupling receiving module, the third end of the primary side control module is grounded, and the second end of the optical coupling receiving module is grounded; The second end of the transformer is coupled to the first end of the optical coupling output module and the first end of the secondary side control module respectively, the second end of the secondary side control module is coupled to the second end of the optical coupling output module, the third end of the secondary side control module is coupled to the output end of the secondary side circuit, and the fourth end of the secondary side control module is coupled to the third end of the transformer or the second end of the transformer to receive the coded signal transmitted by the primary side circuit; The secondary-side control module is configured to: output a first signal through the optocoupler output module when a load at the output end of the secondary circuit changes; and When the coded signal is received, a confirmation response signal is sent through the optical coupler output module, wherein the confirmation response signal is used to indicate that the secondary circuit is in a normal working state; The optical coupler receiving module is configured to: change the voltage value of the second end of the primary side control module based on the first signal and the confirmation response signal; The primary-side control module is configured to: transmit the coded signal to the transformer according to a voltage value of the second terminal of the primary-side control module corresponding to the first signal; and The working state of the power converter is controlled according to the voltage value of the second terminal of the primary-side control module corresponding to the confirmation response signal.

2. The power converter according to claim 1, characterized in that The working state of the power converter includes a zero power consumption state and a normal working state, and the working state of the power converter is controlled according to the voltage value of the second end of the primary side control module corresponding to the confirmation response signal, including: When the voltage value of the second end of the primary-side control module corresponding to the confirmation response signal is greater than a first set voltage value, controlling the power converter to enter a zero power consumption state or a normal working state; When the voltage value of the second end of the primary-side control module corresponding to the confirmation response signal is less than a first set voltage value, the power converter is controlled to enter a normal working state or a zero power consumption state.

3. The power converter according to claim 1, characterized in that: The secondary circuit further includes a first resistor, a first end of which is coupled to the second end of the optocoupler output end, and a second end of which is coupled to the first end of the secondary-side control module.

4. The power converter according to claim 1, characterized in that: The secondary circuit also includes a voltage stabilizing unit, a first end of the voltage stabilizing unit is respectively coupled to the second end of the secondary side control module and the second end of the optocoupler output module, and a second end of the voltage stabilizing unit is coupled to the fifth end of the secondary side control module.

5. The power converter according to claim 4, characterized in that: The voltage stabilizing unit includes a first voltage stabilizing subunit, including: a first voltage stabilizing resistor and a first voltage stabilizing capacitor; The first end of the first voltage-stabilizing resistor is coupled to the second end of the secondary-side control module and the second end of the optocoupler output module respectively, the second end of the first voltage-stabilizing resistor is coupled to the first end of the first voltage-stabilizing capacitor, and the second end of the first voltage-stabilizing capacitor is coupled to the fifth end of the secondary-side control module.

6. The power converter according to claim 5, characterized in that The voltage stabilizing unit further includes a second voltage stabilizing subunit, and the second voltage stabilizing subunit includes: a second voltage stabilizing resistor and a second voltage stabilizing capacitor; The first end of the second voltage-stabilizing resistor is respectively coupled to the second end of the secondary-side control module and the second end of the optocoupler output module, the second end of the second voltage-stabilizing resistor is coupled to the first end of the first voltage-stabilizing capacitor, and the second end of the first voltage-stabilizing capacitor is coupled to the sixth end of the secondary-side control module.

7. The power converter according to claim 1, characterized in that: The secondary circuit also includes a first diode, an anode of the first diode is coupled to the fourth terminal ground of the secondary side control module, and a cathode of the first diode is respectively coupled to the third terminal of the transformer and the fourth terminal of the secondary side control module.

8. The power converter according to claim 7, characterized in that: The secondary circuit also includes a first voltage-dividing resistor and a second voltage-dividing resistor; The first end of the first voltage-dividing resistor is respectively coupled to the third end of the transformer and the cathode of the first diode, the second end of the first voltage-dividing resistor is respectively coupled to the first end of the second voltage-dividing resistor and the fourth end of the secondary sub-control module, and the second end of the second voltage-dividing resistor is coupled to the fourth ground end of the secondary side control module and the anode of the first diode.

9. The power converter according to claim 1, characterized in that: The secondary circuit further includes a second diode, an anode of the second diode is respectively coupled to the second end of the transformer and the fourth end of the secondary side control module, and a cathode of the second diode is coupled to the first end of the secondary side control module.

10. The power converter according to claim 9, characterized in that: The secondary circuit further includes a third voltage-dividing resistor and a fourth voltage-dividing resistor; The first end of the third voltage-dividing resistor is respectively coupled to the second end of the transformer and the positive electrode of the second diode, the second end of the third voltage-dividing resistor is respectively coupled to the first end of the fourth voltage-dividing resistor and the fourth end of the secondary sub-control module, and the second end of the fourth voltage-dividing resistor is respectively coupled to the fourth end ground of the secondary side control module and the third end of the transformer.

11. The power converter according to claim 2, characterized in that: The primary side control module also includes a pull-up resistor and a primary side control unit; The first end of the pull-up resistor is respectively coupled to the second end of the primary side control module, the second end of the pull-up resistor receives a first set voltage, the third end of the pull-up resistor is coupled to the first end of the primary side control unit, and the second end of the primary side control unit is coupled to the first end of the primary side control module.

12. The power converter according to claim 2, characterized in that: The primary side control module also includes a pull-down resistor and a primary side control unit; The first end of the pull-down resistor is respectively coupled to the second end of the primary side control module, the second end of the pull-down resistor receives a first set voltage, the third end of the pull-down resistor is coupled to the first end of the primary side control unit, and the second end of the primary side control unit is coupled to the first end of the primary side control module.

13. A power supply device, characterized in that: A power converter comprising any one of claims 1 to 12.

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