CN204858974U - A high-reliability and high-power intelligent current-sharing power supply module - Google Patents

Abstract

The utility model discloses a high -power intelligence of high reliability power module that flow equalizes, high -power intelligence of high reliability power module that flow equalizes includes direct -current input, isolation transformer, master power switch pipe, clamper tube, auto -excitation type auxiliary circuit, the wide modulator of fat, synchronous Rectifier filter circuit, constant current circuit, the circuit that flow equalizes, direct current output. High -power intelligence of high reliability power module that flow equalizes adopts the single -end and is just swashing the active clamping circuit, and the volume only is 615813mm, world standard bat size, and maximum power can reach 500W, can realize the parallelly connected use of maximum 20 power module. The synchronous Rectifier technique is adopted in output, and efficiency can reach more than 93%, and output overflows, short -circuit protection adopts the design of constant current formula. High -power intelligence of high reliability power module that flow equalizes adopts PCB board and ceramic substrate stacked structure, and the signal device distributes on the PCB board, and the power device distributes on ceramic substrate, both can solve the electromagnetic interference problem, can improve high -power power module heat dissipation problem again. The utility model discloses an under equal overall dimension condition, power density improves greatly, and protect function is more perfect, characteristics such as the redundant parallelly connected use of a lot of platform power module.

Description

A high-reliability and high-power intelligent current-sharing power supply module

technical field

The utility model relates to a power supply module, in particular to a high-reliability and high-power intelligent current-equalizing power supply module, which belongs to the technical field of power electronics.

Background technique

At present, the research and application of various circuit topologies in China are relatively mature, but there are certain defects in the research of intelligence, high power and high reliability. The relatively well-known power module manufacturer, TDK Corporation of Japan, has the world standard half-brick size It also only achieves a power of 300W, and most high-power power modules do not have the output current sharing function. Even if there is a current sharing function, it is a non-autonomous current sharing method. It is impossible to realize the application of high-power distributed power system.

The overcurrent and short circuit protection circuits of traditional high-power power modules mostly use power limiting, wraparound and hiccup protection, but the failure rate is high. After deep current limiting, the amplitude of the MOS tube far exceeds the rated withstand voltage, and the MOS tube is easy Damaged by breakdown. The hiccup mode can protect the MOS tube very well, but the power module will not be able to start after the output is connected in parallel with a large value capacitor. For high-power power supply modules, it is very limited in practical application.

Utility model content

The utility model is a high-reliability and high-power intelligent current-sharing power supply module designed to solve the above-mentioned technical problems.

The technical scheme that the utility model solves its technical problem adopts is:

A high-reliability and high-power intelligent current-sharing power supply module, including DC input, isolation transformer, energy storage inductor, main power switch tube, clamp tube, self-excited auxiliary circuit, pulse width modulator, synchronous rectification filter circuit, constant Current circuit, current equalizing circuit and DC output; the DC input voltage is coupled and output by the isolation transformer T1, and then output to the synchronous rectification filter circuit through the energy storage inductor L1 to output the DC output voltage; the main power switch tube is controlled by the pulse width modulator U1, thus Control the working state of the isolation transformer T1 to achieve the purpose of controlling the DC output voltage; the 8-pin OUT-A of U1 drives the gates of the main power switch tubes Q1 and Q2 through the totem amplifier U2 and the drive series resistor R17, and the main power switch tubes Q1 and Q2 are pressed The 14-pin RT terminal of U1 is connected to the frequency cycle set by the external resistor R14 to switch; when the main power switch tubes Q1 and Q2 are saturated and turned on, the primary current of T1 flows through, which transmits energy to the secondary of T1 and charges the energy storage inductor L1 at the same time After being rectified by secondary synchronous rectification MOS transistors Q4~Q6 and filtered by capacitors C31~C38, a smooth DC voltage is output; when the main power switch tubes Q1 and Q2 are cut off, the 9-pin OUT-B of U1 passes through the totem amplifier U3, adjustable dead The area capacitor C19 and the driving series resistor R19 drive the gate of the clamping tube Q3, and the clamping tube also switches according to the frequency period set by the external resistor R14 at the 14-pin RT end of U1; the reverse voltage of the primary winding of T1 passes through the clamping tube Q3 It is connected in series with the clamping capacitors C23~C25 to form a loop, and the clamping tube Q3 is saturated and turned on, absorbing the voltage stress generated by the reverse winding of the primary winding of T1; at the same time, the energy storage inductor L1 starts to release energy, and the secondary synchronous rectification MOS Tubes Q7~Q9 rectify and capacitors C31~C38 filter to output a smooth DC voltage; the self-excited auxiliary circuit is the 7-pin VCC terminal of the pulse width modulator U1, the 8-pin V+ of the operational amplifier U4 and the special intelligent current sharing chip U5. 8-pin VCC power supply; when the output enters the over-current or short-circuit state, the current sampling resistor R42 connects the sampling signal to the 2-pin inverting terminal I1- of the operational amplifier U4 through the resistors R43 and R44, and is amplified by the 1-pin of the operational amplifier U4 The pin output terminal OUT1 sends the amplified signal to the 5-pin non-inverting terminal I2+ of the operational amplifier U4, the resistor R51 and the voltage regulator U11 form a reference source, and the resistors R50 and R49 divide the voltage and then the resistor R46 is the 6-pin inverting terminal of the operational amplifier U4 I2- provides a stable reference voltage. The non-inverting terminal I2+ is compared with the inverting terminal I2-. When the potential of the non-inverting terminal I2+ is higher than the potential of the inverting terminal I2-, the 7-pin output terminal OUT2 of the operational amplifier U4 outputs a high level. R47 and R48 are connected to the anode of the light-emitting diode of the photocoupler U8. The light-emitting diode of the photocoupler U8 transmits energy to the light-receiving transistor, and the light-receiving transistor is turned on. The collector of the light-receiving transistor is connected to the 13-pin COMP terminal of the pulse width modulator U1. COMP The terminal is set to low, and the pulse width modulator U1 adjusts the pulse width to make the duty cycle smaller and the output voltage lower; since the output load remains unchanged, according to the ohm The law, the voltage is proportional to the current, the output current becomes smaller, the current sampling resistor R42 cannot detect the overcurrent signal, the potential of the non-inverting terminal I2+ of the operational amplifier U4 is lower than the potential of the inverting terminal I2-, and the 7-pin output terminal OUT2 of the operational amplifier U4 outputs Low level, the photocoupler U8 stops working, the 13-pin COMP terminal of the pulse width modulator U1 is set to high, and the pulse width modulator U1 adjusts the pulse width again to increase the duty cycle, increase the output voltage, and output current becomes larger, the current sampling resistor R42 detects an overcurrent signal, the 7-pin output terminal OUT2 of the operational amplifier U4 outputs high level again, the light-emitting diode of the photocoupler U8 transmits energy to the phototransistor, and the 13-pin COMP of the pulse width modulator U1 The terminal is set to low, and the pulse width modulator U1 adjusts the pulse width to make the duty cycle smaller and the output voltage lower, so that a closed loop is formed, and the output enters a constant current state to complete the over-current or short-circuit protection function. After the over-current or short-circuit fault is removed, the voltage returns to normal; the 6-pin SHARE- and 7-pin SHARE+ of the dedicated intelligent current sharing chip U5 are current sharing terminals. SHARE- is connected to one point in parallel, and SHARE+ is connected to one point in parallel to realize the current sharing function.

The high-reliability and high-power intelligent current-sharing power supply module, its dedicated intelligent current-sharing chip U5 controls multiple parallel main power supply modules and slave power supply modules. The balanced power module will automatically move closer to the main power module with high current through the shared terminal, the 3-pin ADJ of the special intelligent current sharing chip U5 is automatically set to low position, the light-emitting diode of the photocoupler U9 is turned on, and the light-receiving transistor of U9 adjusts the output voltage to rise , when the output voltage rises to be nearly the same as the output voltage of the main power module, the output current is adjusted accordingly, so as to realize the current sharing protection between the main power module and the slave power module, and realize the parallel connection of up to 20 power modules.

In the high-reliability and high-power intelligent current-sharing power supply module, the isolation transformer T1 and the energy storage inductor L1 are planar transformers made of PC44 magnetic material, which can output a maximum power of 800W.

The high-reliability and high-power intelligent current-sharing power supply module, the main power switch tube and the clamp tube are both TDSON-8 packaged high-power MOS tubes, and the resistance R _DS between the drain and the source is less than 2mΩ when it is in saturated conduction , improve the conversion efficiency of the power module.

The high-reliability and high-power intelligent current-sharing power supply module, its pulse width modulator U1 is an LM5025B packaged in TSSOP-16, with a programmable oscillator inside the chip, and a configuration between the main switch drive and the active clamp drive Programmable overlap or dead time with programmable undervoltage lockout.

The utility model adopts LM5025B as a PWM pulse width control chip, and has an effective clamping/resetting technology used in a distributed power supply structure. LM5025B is used in high switching frequency, which has higher efficiency and higher power density than normal forward regulators usually used in communications, automotive electronics, industrial power systems and multi-output power supplies, and is especially suitable for making high-power power modules. The LM5025B has a user-programmable undervoltage lockout circuit with adjustable hysteresis, which can be directly applied to the input undervoltage protection circuit;

The output over-current and short-circuit protection of the utility model adopts a constant-current design. After the power module enters the over-current or short-circuit state, it will automatically adjust the PWM pulse width to reduce the loss of useless work, and the output current does not change with the input change, which improves the deep current limit. The electrical stress impact on the MOS tube. The power module automatically returns to normal working state after the overcurrent or short circuit fault is removed.

The utility model can realize the parallel use of multiple power supply modules, and the consistency of the current sharing coefficient is good. Different from the traditional current sharing mode, the utility model adopts the "intelligent current sharing" mode for current sharing design, and there is no need to artificially set the master and slave power supply modules. The master and slave power modules are determined according to the dynamic output current. The power module with the largest output current automatically becomes the master power module, and the other power modules are slave power modules. The slave power modules actively move closer to the master power module to prevent one or more power modules from running in the current limit state. The parallel connection of multiple power supply modules of the utility model can reach a maximum power of 10KW.

The utility model has the following characteristics:

1. Both input and output are DC voltage, and the insulation voltage of input and output is 1000V;

2. The input voltage covers DC9V~72V, and the output voltage covers DC3.3V~48V;

3. The volume of the power module is: 61*58*13mm (as shown in Figure 4 and 5), and the maximum output power can reach 500W;

4. The input has an undervoltage lockout function, and the overcurrent and short circuit protection is constant current;

5. The power module has an intelligent current sharing function, which can realize redundant parallel connection of up to 20 power modules, and the maximum power can reach 10KW;

The beneficial effect of the utility model is that it has a highly reliable operation mode, which ensures that the power supply module is protected in time when it enters an overcurrent and short circuit state, and resumes normal work after the fault is removed. When multiple power modules are redundantly connected in parallel, they can be intelligently controlled by current sharing, which has the characteristics of high intelligence of power modules and strong environmental adaptability.

Description of drawings

Fig. 1 is a functional block diagram of the utility model.

Fig. 2-1 is the first part of the schematic diagram of the utility model.

Fig. 2-2 is the second part of the schematic diagram of the utility model.

Fig. 3 is a schematic diagram of redundant parallel current sharing modules of multiple power supply modules of the present invention.

Fig. 4 is a front view of the structure of the utility model.

Fig. 5 is a front view of the structure of the utility model.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

As shown in Figures 1, 2-1, 2-2 and 3, the utility model is a high-reliability and high-power intelligent current sharing power supply module, including DC input, isolation transformer, energy storage inductor, main power switch tube, clamp Tube, self-excited auxiliary circuit, pulse width modulator, synchronous rectification filter circuit, constant current circuit, current equalization circuit and DC output; the DC input voltage is coupled and output by the isolation transformer T1 and output to the synchronous rectification filter circuit through the energy storage inductor L1 Then output the DC output voltage; the main power switch tube is controlled by the pulse width modulator U1, thereby controlling the working state of the isolation transformer T1 to achieve the purpose of controlling the DC output voltage; the 8-pin OUT-A of U1 is driven by the totem amplifier U2 and the driving series resistor R17 The gates of the main power switch tubes Q1 and Q2, the main power switch tubes Q1 and Q2 switch according to the frequency period set by the external resistor R14 at the 14-pin RT end of U1; when the main power switch tubes Q1 and Q2 are saturated and turned on, the primary There is a current flowing through it, which transmits energy to the secondary side of T1, and at the same time charges the energy storage inductor L1, which is rectified by the secondary synchronous rectification MOS tubes Q4~Q6 and filtered by capacitors C31~C38 to output a smooth DC voltage; the main power switch tubes Q1, When Q2 is off, U1's 9-pin OUT-B drives the gate of clamping tube Q3 through totem amplifier U3, adjustable dead-zone capacitor C19 and driving series resistor R19, and the clamping tube is also set according to the external resistor R14 of U1's 14-pin RT The switch is performed at a fixed frequency cycle; the reverse voltage of the primary winding of T1 is connected in series with the clamping tube Q3 and the clamping capacitors C23~C25 to form a loop, and the clamping tube Q3 is saturated and turned on, absorbing the voltage stress generated in the reverse direction of the primary winding of T1 At the same time, the energy storage inductor L1 starts to release energy, which is rectified by the secondary synchronous rectification MOS tubes Q7~Q9 and filtered by capacitors C31~C38 to output a smooth DC voltage; the self-excited auxiliary circuit is the 7 Pin VCC terminal, 8-pin V+ of the operational amplifier U4 and 8-pin VCC of the special intelligent current sharing chip U5 supply power; when the output enters an overcurrent or short-circuit state, the current sampling resistor R42 connects the sampling signal to the operational amplifier through resistors R43 and R44 The 2-pin inverting terminal I1- of U4 is amplified, and the amplified signal is sent to the 5-pin non-inverting terminal I2+ of the operational amplifier U4 by the 1-pin output terminal OUT1 of the operational amplifier U4 after being amplified. The resistor R51 and the voltage regulator U11 form a reference source. R50 and R49 divide the voltage and provide a stable reference voltage for the 6-pin inverting terminal I2- of the operational amplifier U4 through the resistor R46. The non-inverting terminal I2+ is compared with the inverting terminal I2-, and the potential of the non-inverting terminal I2+ is higher than that of the inverting terminal I2- When the potential is high, the 7-pin output terminal OUT2 of the operational amplifier U4 outputs a high level, and is connected to the anode of the light-emitting diode of the photocoupler U8 through the resistors R47 and R48. , the collector of the light-receiving transistor is connected to the 13-pin COMP terminal of the pulse width modulator U1, and the COMP terminal is set to a low position, and the pulse width modulator U1 adjusts the pulse width to make the duty cycle smaller. The output voltage becomes lower; since the output load remains unchanged, according to Ohm's law, the voltage is proportional to the current, the output current becomes smaller, the current sampling resistor R42 cannot detect the overcurrent signal, and the potential of the non-inverting terminal I2+ of the operational amplifier U4 is lower than that of the inverting terminal I2 -potential, the 7-pin output terminal OUT2 of the operational amplifier U4 outputs a low level, the photocoupler U8 stops working, the 13-pin COMP terminal of the pulse width modulator U1 is set to a high position, and the pulse width modulator U1 adjusts the pulse width again, so that The duty cycle becomes larger, the output voltage becomes higher, the output current becomes larger, the current sampling resistor R42 detects an overcurrent signal, the 7-pin output terminal OUT2 of the operational amplifier U4 outputs a high level again, and the light-emitting diode of the photocoupler U8 sends light to the receiving The triode transfers energy, the 13-pin COMP terminal of the pulse width modulator U1 is set to a low position, and the pulse width modulator U1 adjusts the pulse width to make the duty cycle smaller and the output voltage lower. In constant current state, the over-current or short-circuit protection function is completed. When the over-current or short-circuit fault is removed, the voltage returns to normal; the 6-pin SHARE- and 7-pin SHARE+ of the dedicated intelligent current sharing chip U5 are current sharing terminals. When multiple power supplies When the output terminals of the modules are redundantly connected in parallel, the SHARE- of each power module is connected in parallel to one point, and the SHARE+ is connected in parallel to one point to realize the current sharing function.

The high-reliability and high-power intelligent current-sharing power supply module, its dedicated intelligent current-sharing chip U5 controls multiple parallel main power supply modules and slave power supply modules. The balanced power module will automatically move closer to the main power module with high current through the shared terminal, the 3-pin ADJ of the special intelligent current sharing chip U5 is automatically set to low position, the light-emitting diode of the photocoupler U9 is turned on, and the light-receiving transistor of U9 adjusts the output voltage to rise , when the output voltage rises to be nearly the same as the output voltage of the main power module, the output current is adjusted accordingly, so as to realize the current sharing protection between the main power module and the slave power module, and realize the parallel connection of up to 20 power modules.

In the high-reliability and high-power intelligent current-sharing power supply module, the isolation transformer T1 and the energy storage inductor L1 are planar transformers made of PC44 magnetic material, which can output a maximum power of 800W.

The high-reliability and high-power intelligent current-sharing power supply module, the main power switch tube and the clamp tube are both TDSON-8 packaged high-power MOS tubes, and the resistance R _DS between the drain and the source is less than 2mΩ when it is in saturated conduction , improve the conversion efficiency of the power module.

The high-reliability and high-power intelligent current-sharing power supply module, its pulse width modulator U1 is an LM5025B packaged in TSSOP-16, with a programmable oscillator inside the chip, and a configuration between the main switch drive and the active clamp drive Programmable overlap or dead time with programmable undervoltage lockout.

Designed according to the above principles, the whole circuit is easy to debug, stable in operation, high in reliability, and has an efficiency of over 93%. In particular, the power density of the power module is high, and the intelligent current sharing mode is advanced, which has been applied in actual equipment. In addition, according to specific circuit index requirements, the circuit can be flexibly controlled and changed, and other application circuits can be designed.

The utility model is not limited to the above-mentioned best implementation mode, and any other products identical or similar to the utility model obtained by anyone under the enlightenment of the utility model all fall within the protection scope of the utility model.

Claims (5)

1. a highly reliable large power intelligent load sharing power module, comprises direct current input, isolating transformer, energy storage inductor, master power switch pipe, clamper tube, auto-excitation type auxiliary circuit, pulse width modulator, synchronous rectification filter circuit, constant-current circuit, flow equalizing circuit and direct current and exports, it is characterized in that: DC input voitage is exported to synchronous rectification filter circuit through isolating transformer T1 coupling output through energy storage inductor L1 and exported VD again, master power switch pipe controls by pulse width modulator U1, thus controls isolating transformer T1 operating state, reaches and controls VD object, the 8 pin OUT-A of U1 are by totem amplifier U2, the grid driving series resistance R17 driving master power switch pipe Q1, Q2, and master power switch pipe Q1, Q2 hold the frequency period of outer meeting resistance R14 setting to carry out switch by the 14 pin RT of U1, during master power switch pipe Q1, Q2 saturation conduction, T1 is elementary has electric current to flow through, to T1 secondary transmission energy, simultaneously for energy storage inductor L1 charges, and the direct voltage of output smoothing after secondary synchronization rectification metal-oxide-semiconductor Q4 ~ Q6 rectification, electric capacity C31 ~ C38 filtering, during master power switch pipe Q1, Q2 cut-off, the 9 pin OUT-B of U1 are by totem amplifier U3, adjustable dead band electric capacity C19 and drive series resistance R19 to drive clamper tube Q3 grid, and clamper tube holds the frequency period of outer meeting resistance R14 setting to carry out switch by the 14 pin RT of U1 equally, the reverse voltage of T1 armature winding is through clamper tube Q3 and clamp capacitor C23 ~ C25 loop in series, and clamper tube Q3 saturation conduction, sponges the voltage stress that former for T1 limit winding oppositely produces, meanwhile energy storage inductor L1 starts to release energy, the direct voltage of output smoothing after secondary synchronization rectification metal-oxide-semiconductor Q7 ~ Q9 rectification, electric capacity C31 ~ C38 filtering, auto-excitation type auxiliary circuit is that the 7 pin VCC of pulse width modulator U1 hold, the 8 pin V+ of operational amplifier U4 and the 8 pin VCC of special intelligent current-sharing chip U5 power, when output enters overcurrent or short-circuit condition, current sampling resistor R42 by sampled signal through resistance R43, R44 is connected to the 2 pin end of oppisite phase I1-of operational amplifier U4, after amplifying, by the 1 pin output OUT1 of operational amplifier U4, amplifying signal is sent into the 5 pin in-phase end I2+ of operational amplifier U4, resistance R51 and pressurizer U11 forms a reference source, the 6 pin end of oppisite phase I2-being operational amplifier U4 through resistance R46 after resistance R50 and R49 dividing potential drop provide a stable reference voltage, in-phase end I2+ and end of oppisite phase I2-compares, when in-phase end I2+ current potential is higher than end of oppisite phase I2-current potential, the 7 pin output OUT2 of operational amplifier U4 export high level, through resistance R47, R48 is connected to the light-emitting diodes tube anode of photoelectrical coupler U8, the light-emitting diode of photoelectrical coupler U8 is to illuminated triode transferring energy, illuminated triode conducting, illuminated triode collector electrode is held with the 13 pin COMP of pulse width modulator U1 and is connected, COMP end sets low position, pulse width modulator U1 adjusts pulsewidth, duty ratio is diminished, output voltage step-down, because output loading is constant, according to Ohm's law, voltage is directly proportional to electric current, output current diminishes, current sampling resistor R42 can not detect over-current signal, operational amplifier U4 in-phase end I2+ current potential is lower than end of oppisite phase I2-current potential, the 7 pin output OUT2 output low levels of operational amplifier U4, photoelectrical coupler U8 quits work, the 13 pin COMP ends of pulse width modulator U1 set high position, pulse width modulator U1 adjusts pulsewidth again, duty ratio is made to become large, output voltage uprises, output current becomes large, current sampling resistor R42 detects over-current signal, the 7 pin output OUT2 of operational amplifier U4 export high level again, the light-emitting diode of photoelectrical coupler U8 is to illuminated triode transferring energy, the 13 pin COMP ends of pulse width modulator U1 set low position, pulse width modulator U1 adjusts pulsewidth, duty ratio is diminished, output voltage step-down, and so forth, form a closed loop, output enters constant current state, complete overcurrent or short-circuit protection function, after overcurrent or short trouble are removed, voltage resume is normal, the 6 pin SHARE-of special intelligent current-sharing chip U5 and 7 pin SHARE+ be current-sharing share hold, when multiple stage power module outlet redundant parallel, the SHARE-of every platform power module is connected in parallel to a bit, and SHARE+ is connected in parallel to a bit, realizes flow equalizing function.

2. a kind of highly reliable large power intelligent load sharing power module according to claim 1, it is characterized in that: special intelligent current-sharing chip U5 controls multi-channel parallel main power source module and from power module, when there is current-unbalance in separate unit or multiple stage power module, the power module of current-unbalance will be drawn close to the main power source module of big current by sharing end automatically, the 3 pin ADJ of special intelligent current-sharing chip U5 set low position automatically, the LEDs ON of photoelectrical coupler U9, the illuminated triode adjustment output voltage of U9 rises, when output voltage rises to and is bordering on identical with main power source module output voltage, output current is adjusted thereupon, thus realize main power source module and protect from the current-sharing of power module, realize reaching at most 20 power module parallel connections.

3. a kind of highly reliable large power intelligent load sharing power module according to claim 1, is characterized in that: isolating transformer T1 and energy storage inductor L1 is the flat-plate transformer of PC44 magnetic material, exportable maximum power 800W.

4. a kind of highly reliable large power intelligent load sharing power module according to claim 1, is characterized in that: master power switch pipe and clamper tube all adopt TDSON-8 packaged high-power metal-oxide-semiconductor, is in saturation conduction hourglass source electrode resistance R _dSall be less than 2m Ω, promote power module conversion efficiency.

5. a kind of highly reliable large power intelligent load sharing power module according to claim 1, it is characterized in that: pulse width modulator U1 is the LM5025B of TSSOP-16 encapsulation, chip internal has programmable oscillator, main switch drives and be configured with overlap able to programme or Dead Time between active clamp driving, and has undervoltage lookout function able to programme.