CN215734017U - Phase-shifted full-bridge power supply driving circuit board - Google Patents
Phase-shifted full-bridge power supply driving circuit board Download PDFInfo
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- CN215734017U CN215734017U CN202122365005.2U CN202122365005U CN215734017U CN 215734017 U CN215734017 U CN 215734017U CN 202122365005 U CN202122365005 U CN 202122365005U CN 215734017 U CN215734017 U CN 215734017U
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Abstract
The utility model discloses a phase-shifted full-bridge power supply driving circuit board which has a complete logic control function required by an AC-DC power supply of a phase-shifted full-bridge topology, and an advanced direct-current adjustable power supply can be formed by matching the driving circuit board with a proper power stage circuit. The microprocessor for the driving circuit board directly samples each feedback signal and generates the driving waveform, compared with the traditional analog circuit control scheme, a large number of intermediate links are reduced, the functions, the reliability and the cost are all more advantageous, various energy-saving driving algorithms are combined, and the no-load light-load loss and the heating are lower.
Description
Technical Field
The utility model relates to the technical field of switching power supplies, in particular to a phase-shifted full-bridge power supply driving circuit board.
Background
The current market lacks an adjustable direct current power supply with large power, low price and rich functions, the function of the existing high-power adjustable power supply with more than 2000W in the market is relatively single, the topological structure of the power supply falls behind, the conversion efficiency is low, the size is large, and the price is higher. Therefore, a phase-shifted full-bridge power supply driving circuit board is provided.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a phase-shifted full-bridge power supply driving circuit board to solve the problems in the background technology.
In order to achieve the purpose, the utility model provides the following technical scheme: the utility model provides a phase-shifting full-bridge power drive circuit board, includes and once inclines control circuit and secondary side control circuit, it inclines microprocessor, active power factor correction drive unit, flyback auxiliary power drive unit to be equipped with on the control circuit of once, be equipped with secondary side microprocessor, phase-shifting full-bridge drive unit, current sampling amplification unit, voltage sampling bleeder unit, isolation communication transceiver unit, radiator fan speed governing unit, man-machine interactive communication interface, key interface, the multiplexing management unit of button on the secondary side control circuit, it is equipped with the isolation communication transformer to incline between control circuit and the secondary side control circuit.
Preferably, one end of the secondary side output direct current filter capacitor is connected to the voltage sampling voltage division unit, and is connected to the two ADC ports of the secondary side microprocessor through the voltage sampling voltage division unit.
Preferably, one side winding of the isolation communication transformer is connected to the primary side microprocessor, and the other side winding of the isolation communication transformer is connected to the isolation communication transceiver unit of the secondary side control circuit and then connected to the secondary side microprocessor through the isolation communication transceiver unit.
Preferably, a switch tube in the key multiplexing management unit is connected between a power supply rail and one pin of the isolation communication transformer.
Preferably, the diode in the key multiplexing management unit is connected in series with the key interface and the isolated communication transformer winding.
Preferably, a switching tube driver in the cooling fan speed regulation unit is connected to a switching tube, the switching tube and the freewheeling diode are connected in series between two rails of the power supply, a midpoint of the switching tube and the freewheeling diode is connected to one end of an inductor, the other end of the inductor is connected to the fan as an output end, and a capacitor is connected in series between the output end of the inductor and the power supply rail.
Compared with the prior art, the utility model has the following beneficial effects:
in order to prevent the power supply overvoltage accident caused by the damage of the output voltage feedback resistor on the secondary side, the voltage sampling and dividing unit adopts a dual redundancy design, the divided signals are sent to two ADC ports of the microprocessor, two paths of AD values are summed and calculated and then sent to the digital feedback loop, the voltage stabilization precision is improved, and when the difference of the two paths of AD values is detected to be overlarge, the protection state is started and the output is stopped, so that the charging safety of the battery is improved.
In the power-off state, the auxiliary power supply stops working, the primary side microprocessor works in a low-power-consumption mode by means of the micro-current power supply, repeatedly sends out pulse signals to test the alternating-current impedance characteristic of the isolation communication transformer, and judges whether the keys on the secondary side are pressed down or not, so that the power-on action is executed, and the auxiliary power supply starts working.
After the computer is started, due to the signal separation function of the key multiplexing management unit, the secondary side microprocessor does not influence the secondary side microprocessor to read the key state and respond to user operation while performing two-way communication with the primary side microprocessor by using the isolation communication transformer, the design ingeniously realizes single key control on-off, and isolation two-way communication is realized without an optical coupler.
The speed regulating unit of the cooling fan adopts the PWM switching voltage reduction circuit to supply power to the fan, realizes stepless speed regulation of a two-wire common fan, and has the advantages of noise reduction of the fan, high efficiency, energy conservation, reliability, low cost and the like.
The utility model adopts the pluggable connector, can flexibly match power level circuits with different power levels to form a power supply complete machine, is convenient for quick production and later replacement and maintenance, can be used for experimental adjustable power supplies or chargers of various batteries, realizes the function of one machine with multiple purposes, adopts an advanced microprocessor to directly generate a phase-shifted full-bridge driving waveform, combines multiple energy-saving driving algorithms such as frequency reduction and hiccup, and has lower no-load light-load loss and heating compared with the traditional phase-shifted full-bridge power supply.
Drawings
Fig. 1 is a schematic diagram of the overall circuit structure of the present invention.
Fig. 2 is a schematic diagram of a related circuit structure of the isolation communication transformer of the present invention.
Fig. 3 is a schematic circuit diagram of a speed regulating unit of a cooling fan according to the present invention.
Detailed Description
In order to facilitate a better understanding of the utility model for those skilled in the art, the utility model will be described in further detail with reference to the accompanying drawings and specific embodiments, which are given by way of illustration only and do not limit the scope of the utility model.
As shown in fig. 1, a phase-shift full-bridge power driving circuit board comprises a primary side control circuit and a secondary side control circuit, wherein a primary side microprocessor, an active power factor correction driving unit and a flyback auxiliary power driving unit are arranged on the primary side control circuit, a secondary side microprocessor, a phase-shift full-bridge driving unit, a current sampling amplifying unit, a voltage sampling voltage dividing unit, an isolation communication transceiving unit, a cooling fan speed regulating unit, a man-machine interactive communication interface, a key interface and a key multiplexing management unit are arranged on the secondary side control circuit, and an isolation communication transformer is arranged between the primary side control circuit and the secondary side control circuit.
As shown in fig. 1, one end of the secondary side output direct current filter capacitor is connected to the voltage sampling voltage division unit, and is connected to two ADC ports of the secondary side microprocessor through the voltage sampling voltage division unit, and two paths of AD values are sent to the digital feedback loop after summation calculation, so that the voltage stabilization precision is improved, and when the difference of the two paths of AD values is detected to be too large, the protection state is entered and the output is stopped, and the charging safety of the battery is improved.
As shown in fig. 2, one side winding of the isolation communication transformer is connected to the primary side microprocessor, and the other side winding of the isolation communication transformer is connected to the isolation communication transceiver unit of the secondary side control circuit, and is further connected to the secondary side microprocessor through the isolation communication transceiver unit.
As shown in fig. 2, the switch tube in the key multiplexing management unit is connected between a power rail and one pin of the isolation communication transformer. In the shutdown state, the power rail is not powered, the switching tube is not conducted, and pulse voltage with certain amplitude is allowed to appear on the winding of the isolation communication transformer.
As shown in fig. 2, the diodes in the key multiplexing management unit are connected in series with the key interface and the isolated communication transformer winding.
In the shutdown state, the auxiliary power supply stops working, the primary side microprocessor works in a low power consumption mode by means of the micro-current power supply, a specific half-wave driving signal is repeatedly sent out to test the impedance characteristic of the isolated communication transformer winding, if the impedance becomes low, the secondary side key is pressed, then the startup action is executed, and the auxiliary power supply starts working.
After the machine is started, a switching tube in the key multiplexing management unit is conducted, and the level of one end of a winding of the isolation communication transformer is fixed; due to the signal separation effect of the diode in the key multiplexing management unit, when the secondary side microprocessor reads the key state and responds to user operation, the secondary side microprocessor can drive the isolation communication transformer to perform bidirectional communication with the primary side microprocessor through the isolation communication transceiving unit, the design ingeniously realizes single key control on/off, and isolation bidirectional communication is realized without an optical coupler.
As shown in fig. 3, a switching tube driver in the speed regulating unit of the cooling fan is connected to a switching tube, the switching tube and a freewheeling diode are connected in series between two rails of a power supply, a midpoint of the switching tube and the freewheeling diode is connected to one end of an inductor, the other end of the inductor is connected to the fan as an output end, a capacitor is connected in series between the output end of the inductor and the rail of the power supply, and the secondary side microprocessor sends a PWM signal to control the rotation speed of the fan.
The utility model adopts the pluggable connector, can flexibly match power level circuits with different power levels to form a power supply complete machine, is convenient for quick production and later replacement and maintenance, can be used as a charger for testing an adjustable power supply or various batteries, realizes the function of one machine with multiple purposes, adopts an advanced microprocessor to directly generate a phase-shifted full-bridge driving waveform, combines multiple energy-saving driving algorithms such as frequency reduction and hiccup, and has lower no-load light-load loss and heating compared with the traditional phase-shifted full-bridge power supply.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents, improvements and the like that are within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The utility model provides a phase-shifting full-bridge power supply drive circuit board which characterized in that: the primary side control circuit is provided with a primary side microprocessor, an active power factor correction driving unit and a flyback auxiliary power supply driving unit, the secondary side control circuit is provided with a secondary side microprocessor, a phase-shifted full-bridge driving unit, a current sampling amplification unit, a voltage sampling voltage division unit, an isolation communication transceiving unit, a cooling fan speed regulation unit, a man-machine interaction communication interface, a key interface and a key multiplexing management unit, and an isolation communication transformer is arranged between the primary side control circuit and the secondary side control circuit.
2. The phase-shifted full-bridge power driving circuit board according to claim 1, wherein: one end of the secondary side output direct current filter capacitor is connected to the voltage sampling voltage division unit and then connected to the two ADC ports of the secondary side microprocessor through the voltage sampling voltage division unit.
3. The phase-shifted full-bridge power driving circuit board according to claim 1, wherein: and a winding on one side of the isolation communication transformer is connected to the primary side microprocessor, and a winding on the other side of the isolation communication transformer is connected to an isolation communication transceiving unit of the secondary side control circuit and then connected to the secondary side microprocessor through the isolation communication transceiving unit.
4. The phase-shifted full-bridge power driving circuit board according to claim 1, wherein: and a switch tube in the key multiplexing management unit is connected between a power supply rail and one pin of the isolation communication transformer.
5. The phase-shifted full-bridge power driving circuit board according to claim 1, wherein: and the diodes in the key multiplexing management unit are connected with the key interfaces and the isolated communication transformer windings in series.
6. The phase-shifted full-bridge power driving circuit board according to claim 1, wherein: a switching tube driver in the cooling fan speed regulating unit is connected to a switching tube, the switching tube and a fly-wheel diode are connected between two rails of a power supply in series, the middle points of the switching tube and the fly-wheel diode are connected to one end of an inductor, the other end of the inductor is used as an output end to be connected to a fan, and a capacitor is connected between the output end of the inductor and the power supply rail in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122365005.2U CN215734017U (en) | 2021-09-28 | 2021-09-28 | Phase-shifted full-bridge power supply driving circuit board |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122365005.2U CN215734017U (en) | 2021-09-28 | 2021-09-28 | Phase-shifted full-bridge power supply driving circuit board |
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| Publication Number | Publication Date |
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| CN215734017U true CN215734017U (en) | 2022-02-01 |
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| CN202122365005.2U Active CN215734017U (en) | 2021-09-28 | 2021-09-28 | Phase-shifted full-bridge power supply driving circuit board |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114914996A (en) * | 2022-07-13 | 2022-08-16 | 宁波均胜新能源研究院有限公司 | Battery management system and control method thereof |
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2021
- 2021-09-28 CN CN202122365005.2U patent/CN215734017U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114914996A (en) * | 2022-07-13 | 2022-08-16 | 宁波均胜新能源研究院有限公司 | Battery management system and control method thereof |
| CN114914996B (en) * | 2022-07-13 | 2022-10-25 | 宁波均胜新能源研究院有限公司 | Battery management system and control method thereof |
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