CN112994465B - Power supply device and control method thereof - Google Patents
Power supply device and control method thereof Download PDFInfo
- Publication number
- CN112994465B CN112994465B CN202110171760.9A CN202110171760A CN112994465B CN 112994465 B CN112994465 B CN 112994465B CN 202110171760 A CN202110171760 A CN 202110171760A CN 112994465 B CN112994465 B CN 112994465B
- Authority
- CN
- China
- Prior art keywords
- power
- transformer
- primary
- primary side
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000000034 method Methods 0.000 title claims abstract description 12
- 230000002457 bidirectional effect Effects 0.000 claims abstract description 40
- 230000003287 optical effect Effects 0.000 claims abstract description 6
- 238000004804 winding Methods 0.000 claims description 87
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 230000008054 signal transmission Effects 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 4
- 238000001914 filtration Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 10
- 238000002955 isolation Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000005070 sampling Methods 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005669 field effect Effects 0.000 description 2
- 238000011010 flushing procedure Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000000087 stabilizing effect Effects 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000001131 transforming effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/3353—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only having at least two simultaneously operating switches on the input side, e.g. "double forward" or "double (switched) flyback" converter
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The embodiment of the application provides a power supply device and a control method thereof, wherein the power supply device comprises a transformer, a first buck converter, a bidirectional grid driving pulse transformer, a primary side controller, a secondary side controller, a first optical coupler and a second optical coupler; the transformer converts the voltage of an input power supply of a power supply input port to generate an output voltage; the first buck converter is used for carrying out buck on an input power supply of the power supply input port to generate a power supply voltage; the bidirectional gate drive pulse transformer is powered by the supply voltage or the output voltage; the primary side controller is powered by the power supply voltage, and the secondary side controller is powered by the output voltage; the bidirectional grid driving pulse transformer drives the transformer to operate according to a primary side control signal of the primary side controller or a secondary side control signal of the secondary side controller.
Description
Technical Field
The application relates to a power supply device and a control method thereof, which can improve the overall power conversion efficiency of the power supply device and reduce the volume and cost of the device.
Background
Referring to fig. 8, the conventional power supply device includes a transformer 100, a flyback converter 110 (Flyback converter), a primary side controller 120, a secondary side controller 130, a driving winding module 140, and an optocoupler 150, and has a power input port 4, a primary power output port 5, and a secondary power output port 6. A filter 101, a first rectifier 102 and a boost circuit 103 may be connected between the transformer 100 and the power input port 4, wherein the power input end of the filter 101 is connected to an ac power source through the power input port 4, and electromagnetic interference (Electromagnetic Interference, EMI) signals of the ac power source are filtered by the filter 101; the power input end of the first rectifier 102 is electrically connected with the power output end of the filter 101, and the first rectifier 102 performs alternating current/direct current conversion on the alternating current power processed by the filter 101 to convert the alternating current power into direct current power; the power input end of the boost circuit 103 is electrically connected with the power output end of the first rectifier 102, and the boost circuit 103 boosts the direct current power output by the first rectifier 102; a power input end of the transformer 100 is electrically connected to a power output end of the boost circuit 103, and the transformer 100 performs voltage conversion on the boosted dc power to generate a main output voltage.
A second rectifier 104, a first current sensor 105 and a first protection device 106 are connected between the transformer 100 and the main power output port 5, the power input end of the second rectifier 104 is electrically connected with a power output end of the transformer 100, the power output end of the second rectifier 104 is connected with the main power output port 5, and the main output voltage of the transformer 100 is rectified by the second rectifier 104; the power input end of the first current sensor 105 is electrically connected to the power output end of the second rectifier 104, so as to sense the current of the main output voltage rectified by the second rectifier 104; the power input end of the first protection device 106 is electrically connected to the power output end of the first current sensor 105, and the power output end of the first protection device 106 is connected to the main power output port 5.
The flyback converter 110 and a second protection device 111 are connected between the transformer 100 and the auxiliary power output port 6, the power input end of the flyback converter 110 is electrically connected with the power output end of the boost circuit 103, and the flyback converter 110 performs voltage conversion on the boosted direct current power supply to generate an auxiliary output voltage to the auxiliary power output port 6; the power input end of the second protection device 111 is electrically connected to the power output end of the flyback converter 110, wherein the flyback converter 110 is electrically connected to the primary side controller 120 and the secondary side controller 130, and the flyback converter 110 converts the voltage of the boosted dc power to generate a power supply to supply power to the primary side controller 120 and the secondary side controller 130.
The primary side controller 120 may be connected to the filter 101, the first rectifier 102 and the boost circuit 103 to sense voltage and current signals of the primary side of the transformer 100; the secondary side controller 130 is connected to the driving winding module 140, the second rectifier 104, the first current sensor 105 and the first protection device 106, for sensing the voltage and current signals of the secondary side of the transformer 100, controlling the first protection device 106, and outputting a control signal to the driving winding module 140, and the driving winding module 140 drives the transformer 100 to operate; the optocoupler 150 is connected between the primary side controller 120 and the secondary side controller 130 to provide bi-directional signal transmission between the primary side controller 120 and the secondary side controller 130.
Referring to fig. 9, in the prior art, in order to sense whether the input current value of the power input end of the transformer 100 is normal, a second current sensor 107 may be disposed between the transformer 100 and the boost circuit 103, and a current sampling signal VCS is output by the second current sensor 107, and since the operation of the transformer 100 is determined and controlled by the secondary side controller 130, an isolated current sensor, such as a comparator, is required to be additionally disposed on the primary side of the transformer 100, and the current sampling signal VCS is transmitted from the primary side of the transformer 100 to the secondary side controller 130, however, the isolated device is an electrical isolation structure for ensuring the input and output ends, compared with the non-isolated device, an additional isolating structure such as a winding is required, so that the volume of the isolated device is larger than that of the non-isolated device, so that the volume of the existing power supply apparatus requiring the isolated current sensor is difficult to be reduced, and is difficult to meet the market demands of the volume and weight of the existing electronic apparatus, and the load of the power supply apparatus is also caused by the installation of the isolated device.
In addition, when the flyback converter 110 performs voltage conversion on the dc power supply, on one hand, a secondary output voltage is generated and output through the secondary power output port 6, on the other hand, the power supply voltage is generated to supply power to the primary side controller 120 and the secondary side controller 130, in other words, the flyback converter 110 needs to output multiple groups of voltages, the transformer generally includes an iron core and windings, if the output requirements of the multiple groups of voltages are to be met, the number of the iron core and windings in the transformer needs to be correspondingly increased, and the iron core and the windings are all solid components and occupy a certain volume, so that the transformer with multiple groups of output voltages has a larger volume, therefore, the power supply device needs to be provided with the flyback converter 110 with a large volume to meet the requirement of outputting multiple groups of voltages, which causes difficulty in reducing the volume of the power supply device, and each group of voltage conversion causes power consumption, thereby making it difficult to improve the overall power conversion efficiency of the power supply device.
Disclosure of Invention
In view of the above, the present invention provides a power supply device to improve the overall power conversion efficiency of the power supply device and reduce the circuit size and cost.
In order to achieve the above object, the present invention provides a power supply device comprising:
The transformer is provided with a power input end and a power output end, the power input end is electrically connected with a power input port, the power output end is electrically connected with a main power output port, and the transformer performs voltage conversion on an input power of the power input port to generate an output voltage;
The first buck converter is electrically connected between the power input port and the power input end of the transformer and is used for reducing the input power of the power input port to generate a power supply voltage;
a bidirectional grid driving pulse transformer electrically connected with the transformer and the first buck converter and powered by the supply voltage or the output voltage;
A primary side controller electrically connected to the first buck converter and the bi-directional gate drive pulse transformer and powered by the supply voltage;
a secondary side controller electrically connected to the power output end of the transformer and the bidirectional gate driving pulse transformer and powered by the output voltage;
the first optical coupler is electrically connected between the primary side controller and the secondary side controller and used for providing bidirectional signal transmission between the primary side controller and the secondary side controller;
The second optical coupler is electrically connected between the primary side controller and the secondary side controller and is used for providing unidirectional signal transmission for the primary side controller by the secondary side controller;
The primary side controller outputs a primary side control signal to the bidirectional gate driving pulse transformer, and the secondary side controller outputs a secondary side control signal to the bidirectional gate driving pulse transformer, and the bidirectional gate driving pulse transformer drives the transformer to operate according to the primary side control signal or the secondary side control signal.
The invention further provides a control method of a power supply device, which is executed by a primary side controller and a secondary side controller, wherein the steps executed by the primary side controller comprise:
Receiving a power supply voltage to start;
judging whether an input voltage value of a transformer is larger than or equal to an operating voltage value or not, and judging whether the starting is the first starting within a preset time or not;
When the input voltage value of the transformer is judged to be greater than or equal to the operation voltage value, and the starting is the first starting in the preset time, a primary side control signal is output to a bidirectional grid driving pulse transformer to drive the transformer to operate;
The steps executed by the secondary side controller include:
When it is determined that an output voltage value of the transformer is greater than or equal to a preset output voltage value and when it is determined that the time that the output voltage value of the transformer is greater than or equal to the preset output voltage value is longer than a stable power supply threshold time, a control right switching signal is output to stop outputting the primary side control signal, and a secondary side control signal is output to the bidirectional gate driving pulse transformer to drive the transformer to operate.
In the power supply device, the primary side controller is powered by the power supply voltage of the first buck converter, the secondary side controller is powered by the output voltage of the transformer, and the primary side controller and the secondary side controller can both control the transformer through the bidirectional grid driving pulse transformer.
In addition, in the control method of the power supply device, the step of driving the transformer by the primary side control signal and the step of driving the transformer by the secondary side control signal can achieve the aim of controlling the transformer by the primary side controller or the secondary side controller, and the signal of primary measurement is not required to be transmitted to the secondary side by an isolation device, so that the problem of huge volume of the device caused by the additional frame type isolation device can be improved.
Drawings
FIG. 1 is a schematic block diagram of a power supply device according to the present invention;
FIG. 2 is a schematic diagram of a second circuit block of the power supply device of the present invention;
FIG. 3 is a schematic diagram of a third circuit block of the power supply device of the present invention;
FIG. 4 is a circuit block diagram of another embodiment of a power supply device according to the present invention;
FIG. 5 is a schematic circuit block diagram of current sensing on the primary side of the transformer;
FIG. 6 is a flowchart illustrating steps of a method for controlling a power supply device according to the present invention;
FIG. 7A is a first timing diagram of the power supply device of the present invention;
FIG. 7B is a second timing diagram of the power supply device of the present invention;
FIG. 8 is a schematic circuit block diagram of a conventional power supply device;
Fig. 9 is a schematic circuit block diagram of a prior art current sensing on a primary side of a transformer.
Detailed Description
Referring to fig. 1, the power supply device of the present invention includes a transformer 10, a first Buck converter (Buck converter) 20, a bi-directional gate driving pulse transformer 30, a primary side controller 40, a secondary side controller 50, a first optocoupler 60, and a second optocoupler 70.
In this embodiment, a filter 11, a first rectifier 12 and a boost circuit 13 may be connected between the transformer 10 and a power input port 1, wherein the power input end of the filter 11 is connected to an ac power source through the power input port 1, and electromagnetic interference (Electromagnetic Interference, EMI) signals of the ac power source are filtered by the filter 11 to suppress conducted signal noise and radiated signal noise of the ac power source. In this embodiment, the filter 11 is an electromagnetic interference filter (EMI FILITER).
The power input end of the first rectifier 12 is electrically connected to the power output end of the filter 11, the first rectifier 12 performs ac/dc conversion on the ac power processed by the filter 11, converts the ac power into a dc power, and the power output end of the first rectifier 12 outputs a first voltage V ac. In this embodiment, the first rectifier 12 is a bridge rectifier.
The power input end of the boost circuit 13 is electrically connected to the power output end of the first rectifier 12, and the boost circuit 13 boosts the first voltage V ac to a second voltage V bulk for output, in this embodiment, the boost circuit 13 may include a power factor correction circuit (power factor correction, PFC) and a surge current limiter (inrush current limiter), the power factor correction circuit may boost a Power Factor (PF) of the power supply device, and the surge current limiter may suppress a surge current (inrush current) of the power supply device to provide circuit protection. In the embodiment, the voltage boosting circuit 13 can boost the first voltage V ac to the second voltage V bulk of 380V-410V, but the voltage range of the second voltage V bulk is not limited thereto.
A power input end of the transformer 10 is electrically connected to a power output end of the boost circuit 13, and the transformer 10 performs voltage conversion on the boosted dc power to generate an output voltage.
In this embodiment, a second rectifier 21 may be connected between the transformer 10 and a main power output port 2 and a secondary power output port 3, wherein a power input end of the second rectifier 21 is electrically connected to a power output end of the transformer 10, a power output end of the second rectifier 21 is respectively connected to the main power output port 2 and the secondary power output port 3, the output voltage generated by the transformer 10 is rectified by the second rectifier 21, and a main output voltage V12 is output through the main power output port 2, and a secondary output voltage V sb is output through the secondary power output port 3. In the present embodiment, the transformer 10 is a half-bridge LLC converter, the second rectifier 21 is a synchronous rectifier, and the transformer 10 can step down the dc power to 12V, i.e. the primary output voltage V 12 and the secondary output voltage V sb are 12V, but the type of the transformer 10, the type of the second rectifier 21 and the voltage value of the output power are not limited to the present embodiment.
Preferably, a first current sensor 22, a first circuit breaker 23 and a first protection device 24 are connected between the second rectifier 21 and the main power output port 2, wherein the power input end of the first current sensor 22 is electrically connected to the power output end of the second rectifier 21 to sense the current of the output power rectified by the second rectifier 21; the power input end of the first circuit breaker 23 is electrically connected to the power output end of the first current sensor 22, the secondary side controller 50 of the power supply device can control the first circuit breaker 23 to be turned on or off according to whether the power supply of the main output voltage V 12 is stable, when the power supply of the main output voltage V 12 is stable, the first circuit breaker 23 is in a conducting state, and when the power supply of the main output voltage V 12 is not stable, the first circuit breaker 23 is in an off state, so as to ensure that the unstable power supply voltage cannot damage the electronic device connected to the rear end of the main power output port 2; the power input end of the first protection device 24 is electrically connected to the power output end of the first circuit breaker 23, the power output end of the first protection device 24 is connected to the main power output port 2, and the first protection device 24 is used for preventing the voltage of the electronic device connected to the rear end of the main power output port 2 from being back flushed to the power supply device, so as to prevent the power supply device from influencing the circuit operation due to the voltage back flushing of the main power output port 2.
Similarly, a second circuit breaker 31 and a second protection device 32 may be connected between the second rectifier 21 and the secondary power output port 3, where the power input end of the second circuit breaker 31 is electrically connected to the power output end of the second rectifier 21, the secondary side controller 50 of the power supply device may control the second circuit breaker 31 to be turned on or off according to whether the power supply of the secondary output voltage Vsb is stable, when the secondary output voltage V sb is stable, the second circuit breaker 31 is in a turned-on state, and when the secondary output voltage V sb is not stable, the second circuit breaker 31 is in a turned-off state, so as to ensure that the unstable power supply voltage will not damage the electronic device connected to the rear end of the secondary power output port 3; the power input end of the second protection device 32 is electrically connected to the power output end of the second circuit breaker 31, the power output end of the second protection device 32 is connected to the secondary power output port 3, and the second protection device 32 is used for preventing the voltage of the electronic device connected to the rear end of the secondary power output port 3 from being back flushed to the power supply device, so as to prevent the power supply device from influencing the circuit operation due to the voltage back flushing of the secondary power output port 3. In the present embodiment, the first circuit breaker 23 and the second circuit breaker 31 may be a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), and the first protection device 24 and the second protection device 32 may be an Or-ing Metal Oxide Semiconductor Field Effect Transistor (MOSFET), respectively, but the types of the first circuit breaker 23, the second circuit breaker 31, the first protection device 24 and the second protection device 32 are not limited to the present embodiment.
Referring to fig. 2 in conjunction, the thick solid line in fig. 2 represents the power transmission path of the power supply device, the thin solid line represents the internal power supply path of the power supply device, so as to record the internal power supply relationship of each device in the power supply device, the power input end of the first buck converter 20 may be electrically connected to the power output end of the first rectifier 12 and the power input end of the boost circuit 13, and/or the power output end of the boost circuit 13 and the power input end of the transformer 10, the power output end of the first buck converter 20 is electrically connected to the primary side controller 40 and the bidirectional gate driving pulse transformer 30, respectively, the first buck converter 20 steps down the first voltage V ac and/or the second voltage V bulk to a power supply voltage V ccp, and the power supply voltage V ccp powers the primary side controller 40 and the bidirectional gate driving pulse transformer 30.
The bidirectional gate driving pulse transformer 30 includes a first primary gate driving winding pri_n1, a second primary gate driving winding pri_n2, a third primary gate driving winding pri_n3 and a secondary gate driving winding sec_n1, and the bidirectional gate driving pulse transformer 30 can be powered by the supply voltage V ccp outputted by the first buck converter 20 or the output voltage of the transformer 10, and the first primary gate driving winding pri_n1 and the second primary gate driving winding pri_n2 drive the transformer 10 to perform voltage conversion on the dc power supply.
Referring to fig. 3 in conjunction, the thick solid line in fig. 3 represents the power transmission path of the power supply device, the thin solid line represents the signal transmission path inside the power supply device, so as to record the signal transmission relationship of each device inside the power supply device, the primary controller 40 is connected to the first rectifier 12, the boost circuit 13 and the bi-directional gate driving pulse transformer 30, the primary controller 40 can receive the sensing signals corresponding to the first voltage V ac and the second voltage V bulk, and output a primary control signal V Gate Pri to the third primary gate driving winding pri_n3 of the bi-directional gate driving pulse transformer 30, and the third primary gate driving winding pri_n3 drives the first primary gate driving winding pri_n1 and the second primary gate driving winding pri_n2 to operate.
The secondary side controller 50 is connected to the second rectifier 21, the first current sensor 22, the first circuit breaker 23, the second circuit breaker 31, the first protection device 24, the second protection device 32 and the bidirectional gate driving pulse transformer 30, the secondary side controller 50 can sense the current of the output power source rectified by the second rectifier 21 through the first current sensor 22, and output a secondary side control signal V Gate Sec to the secondary side gate driving winding sec_n1, the first primary side gate driving winding pri_n1 and the second primary side gate driving winding pri_n2 are driven by the secondary side gate driving winding sec_n1, and the secondary side controller 50 can control whether the first circuit breaker 23, the second circuit breaker 31, the first protection device 24 and the second protection device 32 are turned on or off, wherein whether the first primary side gate driving winding pri_n1, the second primary side gate driving winding pri_n2 and the secondary side gate driving winding pri_n1 are connected in series, whether the secondary side control signal pri_n1 is turned on or off, and whether the secondary side gate driving winding pri_n1 is driven by the secondary side gate driving winding sec_n1 and the secondary side gate driving winding pri_n2 is driven by the secondary side gate driving winding pri_n2, and the secondary side controller 50 can control whether the first circuit breaker 23, the first circuit breaker 31, the first protection device 24, the first protection device, the second protection device 32 and the second protection device 32 are turned on or off, and the secondary side gate driving pulse winding switch is controlled by the secondary side, and the secondary side controller.
The first optocoupler 60 is connected between the primary side controller 40 and the secondary side controller 50 to provide bi-directional signal transmission between the primary side controller 40 and the secondary side controller 50 and maintain electrical isolation between the primary side and the secondary side, in this embodiment, the first optocoupler 60 includes three transmission channels transmitted from the primary side controller 40 to the secondary side controller 50, and one transmission channel transmitted from the secondary side controller 50 to the primary side controller 40, so that the primary side controller 40 transmits a first voltage signal ACOK corresponding to the first voltage V ac and a second voltage signal BulkOK corresponding to the second voltage V bulk and a RX signal corresponding to the second voltage V bulk and the secondary side controller 50 transmits a TX signal to the primary side controller 40.
The second optocoupler 70 is connected between the primary side controller 40 and the secondary side controller to provide unidirectional signal transmission from the secondary side controller 50 to the primary side controller 40 and maintain electrical isolation between the primary side and the secondary side, in this embodiment, the second optocoupler 70 includes a transmission channel for transmitting a secondary operation signal from the secondary side controller 50 to the primary side controller 40, and the second optocoupler 70 can be regarded as a unidirectional isolated communication transmitter between the primary side controller 40 and the secondary side controller 50.
Referring to fig. 4, in another embodiment, a second buck converter 33 may be connected between the second rectifier 21 and the secondary power output port 3, the power input end of the second buck converter 33 is connected to the power output end of the second rectifier 21, the power output end of the second buck converter 33 is connected to the power input end of the second circuit breaker 31, and the second buck converter 33 further steps down the output power rectified by the second rectifier 21, so that the power supply device provides two power supplies with different voltages through the primary power output port 2 and the secondary power output port 3. For example, taking the voltage value of the output power generated by transforming the dc power by the transformer 10 as 12V, the second buck converter 33 can further step down the output power rectified by the second rectifier 21 to 5V, i.e. the main output voltage V 12 is 12V, and the auxiliary output voltage V sb is 5V, and the power supply device provides two power voltages of 12V and 5V for the back-end electronic device to use through the main power output port 2 and the auxiliary power output port 3.
Referring to fig. 5, preferably, in order to sense whether the input current value of the power input end of the transformer 10 is normal, so as to avoid damage to the back-end device caused by over-current, and influence the power supply benefit of the power supply device, a second current sensor 14 may be disposed between the transformer 10 and the boost circuit 13, and the second current sensor outputs a current sampling signal VCS to the primary-side controller 40.
In the power supply device, the primary controller 40 can output the primary control signal V Gate Pri to the secondary gate drive winding sec_n1 at the primary side of the transformer 10, the third primary gate drive winding pri_n3 of the bi-directional gate drive pulse transformer 30 drives the first primary gate drive winding pri_n1 and the second primary gate drive winding pri_n2 by the third primary gate drive winding pri_n3, and at the secondary side of the transformer 10, the secondary controller 50 can output a secondary control signal V Gate Sec to the secondary gate drive winding sec_n1, the primary controller 40 and the secondary controller 50 can both control whether the transformer 10 performs voltage conversion by the bi-directional gate drive pulse transformer 30, in other words, when the primary controller 40 and the secondary controller 50 can output the sampled current signal V5340 to the primary controller 10 according to the first primary controller winding vcs_n1, and can judge whether the sampled current signal VCS 40 is not sampled from the primary controller 10 to the primary controller 10 when the sampled current signal vcs_s40 is not sampled from the primary controller 10 to the primary controller 10, and the sampled current (primary controller) is not sampled from the primary controller 10 to the primary controller 10 when the sampled from the primary controller 10 is not sampled by the primary controller 10, to drive the first primary gate driving winding pri_n1 and the second primary gate driving winding pri_n2, and to drive the transformer 10.
Compared with the prior art, the power supply device of the invention does not need to be provided with an isolated current sensor such as a current comparing device, and transmits the current sampling signal VCS from the primary side of the transformer 10 to the secondary side controller 50 positioned at the secondary side so as to keep the electrical isolation between the primary side and the secondary side of the transformer.
Referring to fig. 6, the following describes the actual operation flow of the power supply device according to the control method of the present invention, in which steps S101 to S103 are executed by the primary side controller 40, and step S104 is executed by the secondary side controller 50, and the power supply device comprises:
s101: and is started by receiving the power supply voltage Vccp.
S102: it is determined whether the input voltage value of the transformer 10 is greater than or equal to an operating voltage value and whether the start-up is the first start-up within a predetermined time.
S103: when the input voltage value of the transformer 10 is greater than or equal to the operation voltage value and the start is the first start within the preset time, the primary side control signal V Gate Pri is output to the bidirectional gate driving pulse transformer 30 to drive the transformer 10 to operate, wherein the primary side control signal V Gate Pri is received by the third primary side gate driving winding pri_n3 of the bidirectional gate driving pulse transformer 30.
S104: when it is determined that an output voltage value of the transformer 10 is greater than or equal to a preset output voltage value, and a time period when the output voltage value of the transformer 10 is greater than or equal to a preset output voltage value is longer than a stable power supply threshold time, a control right switching signal V DSP_PG is outputted to stop the output of the primary side control signal V Gate Pri, and the secondary side control signal V Gate Sec is outputted to the bidirectional gate driving pulse transformer 30 to drive the transformer 10 to operate.
Referring to fig. 7A and 7B, the following describes the steps S101 to S104 in detail with reference to the timing chart in the power supply device.
In step S101, after an ac power is input to the power supply device through the power input port 1, the filter 11 and the first rectifier 12 sequentially filter and rectify the ac power and output the first voltage V ac, the boost circuit 13 further boosts the first voltage V ac to the second voltage V bulk and outputs the second voltage V bulk, and when the buck converter 20 determines that the first voltage V ac or the second voltage V bulk is greater than or equal to a starting voltage value, the first buck converter 20 is started, and the first buck converter 20 steps down the first voltage V ac output by the first rectifier 12 or the second voltage V bulk output by the boost circuit 13 to generate the supply voltage V ccp. It should be noted that the starting voltage value may be different values when the starting voltage value corresponds to the first voltage V ac or the second voltage V bulk, where the starting voltage value is an adjustable preset value stored in the buck converter 20, and is determined by the arrangement of electronic devices such as a resistor, a capacitor, a diode, an inductor, or a transformer in the buck converter 20, which is a prior art in the field, and is not described herein.
For example, if the starting voltage corresponding to the first voltage V ac is 65V, at the first time T1 in fig. 7A and 7B, the first voltage V ac reaches 65V, the first buck converter 20 is started by the first voltage V ac and steps down the first voltage V ac, so as to generate the supply voltage V ccp for supplying power to the primary side controller 40 and the bidirectional gate driving pulse transformer 30; similarly, if the starting voltage corresponding to the second voltage V bulk is 100V, the second voltage V bulk reaches 100V at the first time T1 in fig. 7A and 7B, the first buck converter 20 is started by the second voltage Vbulk and steps down the second voltage V bulk to generate the supply voltage V ccp to supply power to the primary side controller 40 and the bidirectional gate driving pulse transformer 30.
Corresponding to step S102, in fig. 7A, the primary side controller 40 is denoted by U1, the primary side controller 40 is started at a second time T2 after being powered by the power supply voltage V ccp, and the primary side controller 40 determines whether the first voltage V ac or the second voltage V bulk at the power input end of the transformer 10 is greater than or equal to an operating voltage value after the start, and whether the start of the primary side controller 40 is the first start within a preset time. It should be noted that the operating voltage value may be different values when corresponding to the first voltage Vac or the second voltage V bulk, and the first time T1 to the second time T2 are the time for starting up the primary side controller 40, where the operating voltage value and the preset time are adjustable preset values stored in the primary side controller 40, and may be adjusted according to different power supply requirements.
Corresponding to step S103, the second time T2 to the third time T3 are times when the primary side controller 40 senses the first voltage V ac or the second voltage V bulk and performs the initial start-up determination, taking the primary side controller 40 as an example, if the first voltage Vac reaches the operation voltage value and the primary side controller 40 starts up for the first time within the preset time, the primary side controller 40 continuously regards a primary start-up signal AC INITIAL as valid at the third time T3 until the primary side controller 40 shuts down, and simultaneously outputs the primary side control signal V Gate Pri to the third primary side gate driving winding pri_n3 of the bidirectional gate driving pulse transformer 30 at the third time T3.
In addition, the primary start signal AC INITIAL is stored in the primary side controller 40, the primary side controller 40 determines whether the primary side controller 40 is started for the first time within the preset time through the primary start signal AC INITIAL, and whether the time interval between the last valid end time of the primary start signal AC INITIAL and the current time is greater than or equal to the preset time can be obtained to determine whether the primary side controller 40 is started for the first time within the preset time. For example, taking the preset time as 1 minute as an example, if the time interval between the last valid end time of the initial start signal and the second time T2 is less than 1 minute, the primary side controller 40 determines that the start is not the first start within the preset time, and if the time interval between the last valid end time of the initial start signal and the second time T2 is greater than or equal to 1 minute, the primary side controller 40 determines that the start is the first start within the preset time.
The primary side controller 40 outputs the primary side control signal V Gate Pri to the third primary side gate driving winding pri_n3 of the bidirectional gate driving pulse transformer 30 at a third time T3, the third primary side gate driving winding pri_n3 drives the first primary side gate driving winding pri_n1 and the second primary side gate driving winding pri_n2 to operate, and the first primary side gate driving winding pri_n1 and the second primary side gate driving winding pri_n2 drive the transformer 10 to perform a voltage transformation operation on an input power supply to generate the output voltage, and in this embodiment, the output voltage is the primary output voltage V 12 in fig. 1, so the primary output voltage V 12 in fig. 7A is generated from the third time T3, wherein the primary side controller 40 can control the transformer 10 to perform a frequency reduction by the bidirectional gate driving pulse transformer 30, so that the primary output voltage V12 outputted by the transformer 10 is gradually increased in a stable slope, and thus the overshoot phenomenon of the secondary side voltage or the secondary side voltage is avoided.
Corresponding to step S104, at a fourth time T4, the secondary controller 50 determines that the output voltage value of the transformer 10 has reached the preset output voltage value, and the time that the output voltage value of the transformer 10 reaches the preset output voltage value is longer than the stable power supply threshold time, so that the secondary controller 50 outputs the control right switching signal V DSP_PG to the primary controller 40 at the fourth time T4, after the secondary controller 50 outputs the control right switching signal V DSP_PG, the secondary controller 50 outputs the secondary control signal V Gate Sec to the secondary gate driving winding sec_n1 of the bidirectional gate driving pulse transformer 30 after a control right switching time is first passed, the secondary gate driving winding sec_n1 is driven by the secondary gate driving winding sec_n1 to operate, the primary side gate driving winding pri_n1 and the secondary side gate driving winding pri_n2 are switched by the first primary gate driving winding pri_n1 and the secondary side gate driving winding pri_n2, the secondary side controller 50 is controlled by the preset power supply threshold value, and the secondary side controller 50 is switched to the stable power supply threshold value, and the variable power supply voltage is controlled by the primary side controller 50 and the variable power supply threshold value is switched by the preset power supply voltage controller.
Preferably, at the fourth time T4, when the primary controller 40 receives the control right switching signal V DSP_PG, the primary controller 40 stops outputting the primary control signal V Gate Pri to the bidirectional gate driving pulse transformer 30, and in order to prevent the dual gate driving pulse transformer 10 from simultaneously receiving the primary control signal V Gate Pri and the secondary control signal V Gate Sec, the secondary controller 50 outputs the control right switching signal V DSP_PG and then outputs the secondary control signal V Gate Sec after the control right switching time, and the primary controller 40 can control the third primary gate driving winding pri_n3 to be disconnected, since the third primary gate driving winding pri_n3 cannot establish a voltage to the third primary gate driving winding pri_n3 even if the primary gate driving signal V Gate Pri is output, so as to drive the first primary gate driving winding pri_n1 and the second primary gate driving winding pri_n2 and perform voltage transformation operation on the transformer 10.
Meanwhile, since the primary side controller 40 does not output the primary side control signal V Gate Pri and the secondary side controller 50 does not output the secondary side control signal V Gate Sec at the fourth time T4 to the fifth time T5, the voltage value of the primary output voltage V 12 is slightly reduced, so as to prevent the unstable primary output voltage V 12 from affecting the electronic device connected to the rear end of the primary power output port 2 from the fourth time T4 to the fifth time T5, the secondary side controller 50 can further control the first circuit breaker 23 to break when outputting the control right switching signal V Gate Sec, thereby preventing the unstable primary output voltage V 12 from being output from the primary power output port 2; similarly, the secondary side controller 50 can also control the second circuit breaker 31 to break, so as to avoid the unstable secondary output voltage V sb from being output from the secondary power output port 3.
After the control right switching time, the secondary side controller 50 starts to output the secondary side control signal V Gate Sec at the fifth time T5, and at this time, the secondary side controller 50 controls the transformer 10 to start to operate through the bidirectional gate driving pulse transformer 30, so that the main output voltage V 12 starts to rise from the fifth time T5. The primary output voltage V 12 rises back to the preset output voltage value until the sixth time T6, at this time, the secondary side controller 50 may further control the first circuit breaker 23 to be turned on, and re-output the stable primary output voltage V 12 from the primary power output port 2; similarly, the secondary side controller 50 can also control the second circuit breaker 31 to conduct, and re-output the stable secondary output voltage V sb from the secondary power output port 3. It should be noted that, the time interval from the fourth time T4 to the sixth time T6 is very short, and does not affect the actual power supply operation of the power supply device.
From the sixth time T6, the control right of the transformer 10 is switched to the secondary side controller 50, the primary side controller 40 can continuously sense whether the power supply of the first voltage V ac and the second voltage V bulk generated at the primary side of the transformer 10 is normal, when the power supply of the first voltage V ac is normal, the primary side controller 40 can transmit a first voltage signal ACOK corresponding to the normal power supply of the first voltage V ac to the secondary side controller 50 through the first optocoupler 60, when the power supply of the second voltage V bulk is normal, the primary side controller 40 can transmit a second voltage signal BulkOK corresponding to the normal power supply of the second voltage V bulk to the secondary side controller 50 through the first optocoupler 60, and when the secondary side controller 50 determines that the power supply of the transformer 10 is stable, the secondary side controller 50 can generate a secondary side power supply stabilizing signal SecondaryOK, and after the secondary side generates the secondary side power supply stabilizing signal SecondaryOK at the seventh time T7, the secondary side can control the timing of the output voltages of the primary power output port 2 and the secondary power output port 3 by controlling the first circuit breaker 23 and the second circuit breaker 31, and it should be noted that, in fig. 7B, the timing diagrams of the output voltages V 12 (12V) of the primary power output port 2 and the output voltages V 12 (12V) of the secondary power output port 3 are the voltage values of the output voltages V 12 (12V) and the output voltages V 12 (12V), instead of the output voltages V 12 (12V) and the output voltages V 12 (12V).
In summary, in the power supply device of the present invention, the primary side controller 40 is powered by the first buck converter 20, the secondary side controller 50 is powered by the output power of the transformer 10, and the primary side controller 40 and the secondary side controller 50 can both control the transformer 10 through the bidirectional gate driving pulse transformer 30, compared with the prior art, since the isolated converter has larger size, higher power consumption and higher installation cost, the present invention does not need to additionally provide a flyback converter to respectively power the primary side controller 40 and the secondary side controller 50, which can avoid the power consumption caused by the additional voltage conversion of the flyback converter, increase the overall power conversion efficiency of the power supply device, and reduce the size of the power supply device; on the other hand, since the primary side controller 40 can also control the operation of the transformer 10, the sensing signal of the primary side of the transformer 10 can be directly received by the primary side controller 40 and the transformer 10 is controlled according to the sensing signal, when the sensing signal of the primary side shows that the voltage or current value of the primary side is abnormal, the sensing signal is not required to be transmitted to the secondary side controller 50 by an isolated device, so that the instantaneity of abnormal state processing can be improved, and the additional power consumption for transmitting the sensing signal from the primary side to the secondary side by the isolated device can be reduced.
The present invention is not limited to the above-mentioned embodiments, but is not limited to the above-mentioned embodiments, and any person skilled in the art can make some changes or modifications to the equivalent embodiments without departing from the scope of the technical solution of the present invention, but any simple modification, equivalent changes and modifications to the above-mentioned embodiments according to the technical substance of the present invention are still within the scope of the technical solution of the present invention.
Claims (12)
1. A power supply device, comprising:
The transformer is provided with a power input end and a power output end, the power input end is electrically connected with a power input port, the power output end is electrically connected with a main power output port, and the transformer performs voltage conversion on an input power of the power input port to generate an output voltage;
The first buck converter is electrically connected between the power input port and the power input end of the transformer, and is used for reducing the input power of the power input port to generate a power supply voltage;
A bidirectional gate drive pulse transformer electrically connected to the transformer and the first buck converter and powered by the supply voltage or the output voltage;
A primary side controller electrically connected to the first buck converter and the bi-directional gate drive pulse transformer, powered by the supply voltage;
A secondary side controller electrically connected to the power output end of the transformer and the bidirectional gate drive pulse transformer and supplied with power by the output voltage;
the first optical coupler is electrically connected between the primary side controller and the secondary side controller and used for providing bidirectional signal transmission between the primary side controller and the secondary side controller;
the second optical coupler is electrically connected between the primary side controller and the secondary side controller and is used for providing unidirectional signal transmission for the primary side controller by the secondary side controller;
The primary side controller outputs a primary side control signal to the bidirectional gate driving pulse transformer, and the secondary side controller outputs a secondary side control signal to the bidirectional gate driving pulse transformer, and the bidirectional gate driving pulse transformer drives the transformer to operate according to the primary side control signal or the secondary side control signal.
2. The power supply device according to claim 1, further comprising:
The power input end of the filter is electrically connected with the power input port and used for filtering the input power of the power input port;
the power input end of the first rectifier is electrically connected with the power output end of the filter, rectifies the output power of the filter and outputs a first voltage;
The power input end of the boosting circuit is electrically connected with the power output end of the first rectifier, and the power output end of the boosting circuit is connected with the power input end of the transformer and used for boosting the first voltage and outputting a second voltage.
3. The power supply device according to claim 2, wherein the first buck converter is electrically connected to a power output terminal of the first rectifier or a power output terminal of the boost circuit, and the first buck converter steps down the first voltage output by the first rectifier or the second voltage output by the boost circuit to generate the supply voltage.
4. The power supply of claim 1, wherein the bi-directional gate drive pulse transformer comprises a first primary gate drive winding, a second primary gate drive winding, a third primary gate drive winding, and a secondary gate drive winding;
The primary side controller outputs the primary side control signal to the third primary side gate driving winding of the bidirectional gate driving pulse transformer, the third primary side gate driving winding drives the first primary side gate driving winding and the second primary side gate driving winding to operate, and the first primary side gate driving winding and the second primary side gate driving winding drive the transformer to execute voltage conversion;
The secondary side controller outputs the secondary side control signal to the secondary side gate driving winding of the bidirectional gate driving pulse transformer, the secondary side gate driving winding drives the first primary side gate driving winding and the second primary side gate driving winding to operate, and the first primary side gate driving winding and the second primary side gate driving winding drive the transformer to perform voltage conversion.
5. The power supply device according to claim 1, wherein a second rectifier is arranged between the transformer and the main power output port and between the transformer and the auxiliary power output port, a power input end of the second rectifier is electrically connected with the power output end of the transformer, and a power output end of the second rectifier is electrically connected with the main power output port and the auxiliary power output port;
the second rectifier rectifies the output voltage, outputs a main output voltage through the main power output port, and outputs a sub output voltage through the sub power output port.
6. The power supply device according to claim 5, wherein a power output terminal of the second rectifier and the main power output port are further provided with:
A first current sensor, the power input end of the first current sensor is electrically connected with the power output end of the second rectifier;
the power input end of the first circuit breaker is electrically connected with the power output end of the first current sensor;
the power input end of the first protection device is electrically connected with the power output end of the first circuit breaker, and the power output end of the first protection device is electrically connected with the main power output port.
7. The power supply device according to claim 5, wherein a power output terminal of the second rectifier and the auxiliary power output port are further provided with:
The power input end of the second circuit breaker is electrically connected with the power output end of the second rectifier;
And the power input end of the second protection device is electrically connected with the power output end of the second circuit breaker, and the power output end of the second protection device is electrically connected with the auxiliary power output port.
8. The power supply of claim 7, further comprising a second buck converter, the power input of the second buck converter being electrically coupled to the power output of the second rectifier, and the power output of the second buck converter being electrically coupled to the power input of the second circuit breaker.
9. The power supply device control method is characterized by being executed by a primary side controller and a secondary side controller, wherein the steps executed by the primary side controller comprise:
Receiving a power supply voltage to start;
judging whether an input voltage value of a transformer is larger than or equal to an operating voltage value or not, and judging whether the starting is the first starting within a preset time or not;
When the input voltage value of the transformer is judged to be greater than or equal to the operation voltage value, and the starting is the first starting in the preset time, a primary side control signal is output to a bidirectional grid driving pulse transformer to drive the transformer to operate;
The steps executed by the secondary side controller comprise:
When an output voltage value of the transformer is judged to be greater than or equal to a preset output voltage value, and when the output voltage value of the transformer is judged to be greater than or equal to the preset output voltage value for longer than a stable power supply threshold time, a control right switching signal is output to stop the output of the primary side control signal, and a secondary side control signal is output to the bidirectional grid driving pulse transformer to drive the transformer to operate.
10. The method according to claim 9, wherein the primary controller determines whether the start-up of the primary controller is the first start-up within the predetermined time by a primary start-up signal, and determines whether the start-up of the primary controller is the first start-up within the predetermined time by a time interval between an end time of the primary start-up signal, which is valid last, and a current time being greater than or equal to the predetermined time.
11. The method of claim 9, wherein the primary controller outputs the primary control signal to a third primary gate drive winding of the bi-directional gate drive pulse transformer, the third primary gate drive winding drives a first primary gate drive winding and a second primary gate drive winding, and the first primary gate drive winding and the second primary gate drive winding drive the transformer to perform the transformation operation;
The secondary side controller outputs the secondary side control signal to a secondary side grid driving winding of the bidirectional grid driving pulse transformer, the secondary side grid driving winding drives the first primary side grid driving winding and the second primary side grid driving winding to operate, and the first primary side grid driving winding and the second primary side grid driving winding drive the transformer to perform transformation operation.
12. The method according to claim 9, wherein the secondary side controller outputs the secondary side control signal after a control right switching time when the output voltage value of the transformer is greater than or equal to a preset output voltage value and the output voltage value of the transformer is greater than or equal to a preset output voltage value for longer than a stable power supply threshold time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110171760.9A CN112994465B (en) | 2021-02-08 | 2021-02-08 | Power supply device and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110171760.9A CN112994465B (en) | 2021-02-08 | 2021-02-08 | Power supply device and control method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112994465A CN112994465A (en) | 2021-06-18 |
| CN112994465B true CN112994465B (en) | 2024-04-26 |
Family
ID=76347478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110171760.9A Active CN112994465B (en) | 2021-02-08 | 2021-02-08 | Power supply device and control method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112994465B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI817459B (en) * | 2022-04-25 | 2023-10-01 | 宏碁股份有限公司 | Power delivery device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10108459A (en) * | 1996-09-30 | 1998-04-24 | Toshiba Lighting & Technol Corp | Switching power supply apparatus |
| CN1409884A (en) * | 1999-11-05 | 2003-04-09 | Nec东金株式会社 | Electric energy storage device with cell energy control and method of controlling cell energy |
| CN108696131A (en) * | 2017-04-10 | 2018-10-23 | 台达电子企业管理（上海）有限公司 | control device and control method |
| CN109510466A (en) * | 2017-09-15 | 2019-03-22 | Abb 瑞士股份有限公司 | System and method for starting high density isolation DC/DC electric power converter |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007138537A2 (en) * | 2006-05-29 | 2007-12-06 | Koninklijke Philips Electronics N.V. | Generating drive signals for a synchronous rectification switch of a flyback converter |
| US8334663B2 (en) * | 2010-07-30 | 2012-12-18 | Lutron Electronics Co., Inc. | Power supply for a load control device |
| CN104868731B (en) * | 2014-02-21 | 2017-09-29 | 东莞钜威动力技术有限公司 | Two-way isolation DC DC converters |
| US10333415B2 (en) * | 2016-07-01 | 2019-06-25 | Rohm Co., Ltd. | Insulated synchronous rectification DC/DC converter including synchronous rectification controller controlling synchronous rectification transistor |
-
2021
- 2021-02-08 CN CN202110171760.9A patent/CN112994465B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10108459A (en) * | 1996-09-30 | 1998-04-24 | Toshiba Lighting & Technol Corp | Switching power supply apparatus |
| CN1409884A (en) * | 1999-11-05 | 2003-04-09 | Nec东金株式会社 | Electric energy storage device with cell energy control and method of controlling cell energy |
| CN108696131A (en) * | 2017-04-10 | 2018-10-23 | 台达电子企业管理（上海）有限公司 | control device and control method |
| CN109510466A (en) * | 2017-09-15 | 2019-03-22 | Abb 瑞士股份有限公司 | System and method for starting high density isolation DC/DC electric power converter |
Non-Patent Citations (1)
| Title |
|---|
| 一种超级电容储能的双向逆变电路及其控制策略;柯万宇;汤前进;张华锋;吴慧;朱金;;通信电源技术;20200110(第01期);33-35 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112994465A (en) | 2021-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109962631B (en) | Flyback converter with adjustable frequency reduction curve | |
| US8369111B2 (en) | Ultra low standby consumption in a high power power converter | |
| US7075802B2 (en) | Semiconductor device for controlling switching power supply | |
| CN107534389B (en) | Switching power supply device for switching setting of output voltage and integrated circuit for switching power supply device | |
| US20140254215A1 (en) | Controller for a power converter and method of operating the same | |
| US20120250366A1 (en) | Flyback converter with primary side and secondary side feedback control and method for the same | |
| JP2000116027A (en) | Power supply device | |
| KR20120066603A (en) | Dc/dc converter, and power supply and electronic device using the same | |
| EP2553798B1 (en) | Switched mode power supply with voltage regulator | |
| US9673715B2 (en) | Switching element driving power supply circuit | |
| CN102377169A (en) | Thermal shutdown unit, switch controller including the same, and control method of thermal shutdown protection operation | |
| WO2007063788A1 (en) | Switching power supply device and method for starting same | |
| CN113726165A (en) | Flyback converter and control method thereof | |
| CN112994465B (en) | Power supply device and control method thereof | |
| US20150009516A1 (en) | Image forming apparatus and method of supplying power thereof | |
| US7541691B2 (en) | Standby power supply apparatus | |
| TWI792175B (en) | Power supply device and control method thereof | |
| KR100636550B1 (en) | Free voltage type switching mode power supply | |
| US11496037B2 (en) | Power supply having bidirectional gate driving impulse transformer and control method thereof | |
| CN219068080U (en) | Wide-range voltage-adjustable power supply circuit | |
| CN216904276U (en) | Power protection circuit, switching power supply and electronic equipment | |
| CN217388544U (en) | Power supply circuit and electronic equipment | |
| KR101421021B1 (en) | Multiple output converter comprising a coupling inductor selecting circuit | |
| KR101415922B1 (en) | A power supply device for improving efficiency of power with no-load | |
| US20230412082A1 (en) | Control circuit, system and method for switched-mode power supply |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |