CN213602553U - Control circuit of parallel current-sharing power module - Google Patents
Control circuit of parallel current-sharing power module Download PDFInfo
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- CN213602553U CN213602553U CN202021846065.5U CN202021846065U CN213602553U CN 213602553 U CN213602553 U CN 213602553U CN 202021846065 U CN202021846065 U CN 202021846065U CN 213602553 U CN213602553 U CN 213602553U
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Abstract
The utility model discloses a control circuit of a parallel current-sharing power module, which comprises a PWM controller, a PWM signal modulation circuit containing a current loop differential amplifier, a current-sharing loop differential amplifier, a voltage loop phase inverter and a feedback loop adder, and a shutdown protection circuit; the PWM signal modulation circuit inputs a current sampling signal, a voltage signal and a current equalizing bus signal which are output by the power module, and outputs a phase-shifting control pin feed back which is connected with the PWM controller; the ShutDown protection circuit inputs a primary current sampling signal connected with the power module and outputs a ShutDown control pin ShutDown connected with the PWM controller; the starting overload protection circuit is characterized by further comprising a starting overload protection circuit, wherein the input end of the starting overload protection circuit is connected with a primary current sampling signal, and the output end of the starting overload protection circuit is connected with a phase-shifting control pin feed Back. The control circuit can ensure that the parallel current-sharing power supply module can limit voltage and reduce current during short-time output overload, avoid abnormal shutdown, and ensure normal work even if the starting current is large when the output is connected with inductive loads such as a motor and the like.
Description
Technical Field
The utility model belongs to the technical field of switching power supply and specifically relates to a parallelly connected power module's that flow equalizes control circuit.
Background
With the development of power electronic technology, various electronic devices have more and more demands on high-power, high-current and high-reliability power supply systems, and a switching power supply system which adopts a plurality of modularized power supplies to operate in parallel to output high power and high current is an important direction for power supply technology development. Fig. 1 is a schematic block diagram of a parallel current-sharing power supply system, in which power supply modules of a conventional high-power switching power supply system work in parallel current sharing, and most of the power supply modules work in a control mode of an average current method. Fig. 2 is a schematic diagram of a typical control circuit of a conventional power module, in which a PWM controller introduces a FeedBack and current-sharing control signal of output voltage of the power module through a FeedBack interface, and adjusts phase shifts of PWM driving pulses OUTC and OUTD in real time after internal processing, so as to stabilize the output voltage and achieve parallel current sharing among the modules. However, in practical application, due to differences in performance parameters of components, the start time of each module is different, the power module with the first established output voltage bears the load of the whole system in a short time during the start process, and output current sampling is slow in response due to the existence of a large inductor and a capacitor, so that output current limiting protection cannot be realized quickly, and thus, the primary current of the power module is too large during the start process, so that the ShutDown control pin ShutDown of the PWM controller is triggered to act, the power module enters a repeated startup and ShutDown state, and the whole power system cannot be started with load normally.
Disclosure of Invention
The utility model aims at the above-mentioned defect, improve parallelly connected power module's that flow equalizes control circuit, provide a more perfect parallelly connected power module's that flow equalizes control circuit. In order to achieve the above purpose, the technical scheme of the utility model is that:
a control circuit of a power module with parallel current sharing comprises a PWM controller, a PWM signal modulation circuit and a shutdown protection circuit, wherein the PWM signal modulation circuit comprises a current loop differential amplifier N2A, a current sharing loop differential amplifier N2B, a voltage loop inverter N1A and a feedback loop adder N1B; the input end of the current loop differential amplifier N2A is connected with the output of the output current sampling circuit of the power module, and the output end thereof is connected with the inverting input end of the current-sharing loop differential amplifier; the non-inverting input end of the current-sharing loop differential amplifier N2B is connected with a current-sharing bus level signal Vis, and the output end of the current-sharing loop differential amplifier is connected with the inverting input end of the feedback loop adder; the inverting input end of the voltage loop inverter N1A is connected with the output voltage sampling signal Vo of the power module, and the output end of the voltage loop inverter N1A is connected with the other inverting input end of the feedback loop adder N1B; the output of the FeedBack loop adder N1B is connected to a phase-shift control pin FeedBack of the PWM controller; the ShutDown protection circuit comprises an electric voltage dividing resistor Rcs1 and an Rcs2, one end of the resistor Rcs1 is connected with a sampling level signal Vcs of primary current of the power module, one end of the resistor Rcs2 is grounded, and a voltage dividing node connected with the resistor Rcs1 and the Rcs2 is connected to a ShutDown control pin ShutDown of the PWM controller; the starting overload protection circuit inputs a sampling level signal Vcs of primary current of the power module, and the output of the starting overload protection circuit is connected to a phase-shift control pin FeedBack of the PWM controller.
Further, the start overload protection circuit is composed of a resistor R1 and a diode V1, one end of the resistor R1 is connected to a sampling level signal Vcs of the primary current of the power module, the other end of the resistor R1 is connected to the positive end of the diode V1, and the negative end of the diode V1 is connected to a phase-shift control pin FeedBack of the PWM controller.
Furthermore, the start overload protection circuit further comprises a voltage division resistor R2 and a filter capacitor C1, one end of the voltage division resistor R2 is connected to a node where the resistor R1 is connected with the diode V1, the other end of the voltage division resistor R3526 is grounded, and the filter capacitor C1 is connected to two ends of the voltage division resistor R2 in parallel.
Furthermore, the output current sampling circuit adopts a shunt resistor Rs, and two ends of the shunt resistor are respectively connected with the non-inverting input end and the inverting input end of the current loop differential amplifier.
Further, the shutdown protection circuit further includes a filter capacitor Ccs, and the filter capacitor Ccs is connected in parallel to two ends of the resistor Rcs 2.
Compared with the prior art, the utility model, have following advantage and effect: the parallel current-sharing power supply module can limit voltage and reduce current when outputting overload in a short time, so that abnormal shutdown is avoided; when the power supply module is connected with inductive loads such as a motor and the like, the normal work can be ensured even if the starting current is large.
Drawings
FIG. 1 is a schematic block diagram of a parallel current sharing power supply system;
FIG. 2 is a schematic diagram of a control circuit of a power module in a parallel current-sharing power system;
fig. 3 is a schematic circuit diagram of an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
As shown in fig. 2, in the control circuit of the parallel current-sharing power module in the prior art, a phase shift control pin FeedBack of the PWM controller is accessed to an output voltage FeedBack signal and a current-sharing adjustment signal of the power module through an adder, phase shifts of driving pulses OUTC and OUTD are adjusted in real time after internal processing, stabilization of module output voltage and parallel current sharing between modules are realized, and a sampling level signal Vcs of a primary current is divided by a resistor and then accessed to a ShutDown control pin ShutDown of the PWM controller, so as to realize output short-circuit ShutDown protection.
As shown in fig. 3, in the control circuit of the parallel current-sharing power modules according to the embodiment of the present invention, the shunt resistor Rs samples the output current of the parallel current-sharing power modules, two ends of the shunt resistor Rs are respectively connected to the non-inverting input terminal and the inverting input terminal of the current loop differential amplifier N2A, and the output end of the current loop differential amplifier N2A is connected to the inverting input terminal of the current loop differential amplifier; the non-inverting input end of the current-sharing loop differential amplifier N2B is connected with a current-sharing bus level signal Vis, and the output end of the current-sharing loop differential amplifier is connected with the inverting input end of the feedback loop adder; the non-inverting end of the voltage loop inverting proportional amplifier N1A is grounded, the inverting input end of the voltage loop inverting proportional amplifier is connected with the output voltage sampling signal Vo of the power module, and the output end of the voltage loop inverting proportional amplifier is connected with the other inverting input end of the feedback loop adder N1B; the output of the FeedBack loop adder N1B is connected to a phase-shift control pin FeedBack of the PWM controller, namely the phase-shift control pin FeedBack of the PWM controller is connected to an output voltage FeedBack signal and a current-sharing regulation signal of the power module through the adder, and phase shifts of drive pulses OUTC and OUTD are adjusted in real time after internal processing, so that the stability of module output voltage and parallel current sharing among modules are realized; the sampling level signal Vcs of the primary current of the resistor is connected to a ShutDown control pin Shutdown of the PWM controller through a ShutDown protection circuit consisting of a voltage divider resistor Rcs1, an Rcs2 and a filter capacitor Ccs, wherein one end of the Rcs1 is connected with the sampling level signal Vcs of the primary current of the power module, one end of the resistor Rcs2 is grounded, the capacitor Ccs is connected to two ends of the resistor Rcs2 in parallel, and when the potential of the pin is greater than an internal set value, the driving pulses OUTA, OUTB, OUTC and OUTD are closed to realize output short-circuit ShutDown protection and avoid the power device from being damaged due to overlarge output power; in order to inhibit the starting overload caused by the difference of the opening time of each power supply module, namely, the power supply with the voltage established first bears the load of the whole system in a short time, a sampling level signal Vcs of a primary current is led into a phase shift control pin FeedBack of a PWM controller through a starting overload protection circuit consisting of an isolation diode V1, voltage division resistors R1 and R2 and a filter capacitor C1, wherein the voltage division circuit consisting of the resistors R1 and R2 is used for adjusting a protection threshold, the amplitude of the voltage division circuit is lower than the potential of the phase shift control pin FeedBack when the power supply is in full-load operation, and the voltage division circuit only takes effect when the output is overloaded; the filter capacitor C1 is used for eliminating high-frequency interference and avoiding abnormal action of the feedback loop. The starting overload protection circuit is specifically connected as follows: one end of the resistor R1 is connected with a sampling level signal Vcs of the primary current of the power module, one end of the resistor R2 is grounded, the filter capacitor C1 is connected in parallel with two ends of the resistor R2, the other end of the resistor R1 and the resistor R2, which are connected with the voltage division node resistor R1, is connected with the positive end of the diode V1, and the negative end of the diode V1 is connected with a phase-shift control pin FeedBack of the PWM controller. The startup overload protection circuit regulates the phase shift of drive pulses OUTC and OUTD of a PWM controller in the startup process of a power supply module so as to realize output current-limiting voltage reduction, avoids ShutDown control pin ShutDown action of the controller caused by the time difference of successive startup of the power supply module, can limit voltage and reduce current in short-time output overload, avoids abnormal ShutDown, enables the power supply module to enter a repeated on-off state, and can ensure normal startup even if the startup current is large when the power supply module outputs inductive loads such as a power-on machine and the like.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that there are objectively infinite specific structures due to the limited character expressions, and it will be apparent to those skilled in the art that a plurality of modifications, decorations or changes may be made without departing from the principle of the present invention, and the technical features described above may be combined in a suitable manner; the application of these modifications, variations or combinations, or the application of the concepts and solutions of the present invention in other contexts without modification, is not intended to be considered as a limitation of the present invention.
Claims (5)
1. A control circuit of a power module with parallel current sharing comprises a PWM controller, a PWM signal modulation circuit and a shutdown protection circuit, wherein the PWM signal modulation circuit comprises a current loop differential amplifier N2A, a current sharing loop differential amplifier N2B, a voltage loop inverter N1A and a feedback loop adder N1B; the input end of the current loop differential amplifier N2A is connected with the output of the output current sampling circuit of the power module, and the output end thereof is connected with the inverting input end of the current-sharing loop differential amplifier; the non-inverting input end of the current-sharing loop differential amplifier N2B is connected with a current-sharing bus level signal Vis, and the output end of the current-sharing loop differential amplifier is connected with the inverting input end of the feedback loop adder; the inverting input end of the voltage loop inverter N1A is connected with the output voltage sampling signal Vo of the power module, and the output end of the voltage loop inverter N1A is connected with the other inverting input end of the feedback loop adder N1B; the output of the FeedBack loop adder N1B is connected to a phase-shift control pin FeedBack of the PWM controller; the ShutDown protection circuit comprises an electric voltage dividing resistor Rcs1 and an Rcs2, one end of the resistor Rcs1 is connected with a sampling level signal Vcs of primary current of the power module, one end of the resistor Rcs2 is grounded, and a voltage dividing node connected with the resistor Rcs1 and the Rcs2 is connected to a ShutDown control pin ShutDown of the PWM controller; the method is characterized in that: the starting overload protection circuit inputs a sampling level signal Vcs of primary current of the power module, and the output of the starting overload protection circuit is connected to a phase-shift control pin FeedBack of the PWM controller.
2. The control circuit of the parallel current-sharing power supply module according to claim 1, wherein: the starting overload protection circuit consists of a resistor R1 and a diode V1, one end of the resistor R1 is connected with a sampling level signal Vcs of the primary current of the power module, the other end of the resistor R1 is connected with the positive end of the diode V1, and the negative end of the diode V1 is connected with a phase-shift control pin FeedBack of the PWM controller.
3. The control circuit of the parallel current-sharing power supply module according to claim 2, wherein: the starting overload protection circuit further comprises a voltage division resistor R2 and a filter capacitor C1, one end of the voltage division resistor R2 is connected to a node where the resistor R1 is connected with the diode V1, the other end of the voltage division resistor R3526 is grounded, and the filter capacitor C1 is connected to two ends of the voltage division resistor R2 in parallel.
4. The control circuit of the parallel current-sharing power supply module according to claim 1, wherein: the output current sampling circuit adopts a shunt resistor Rs, and two ends of the shunt resistor are respectively connected with the non-inverting input end and the inverting input end of the current loop differential amplifier.
5. The control circuit of the parallel current-sharing power supply module according to claim 1, wherein: the shutdown protection circuit further comprises a filter capacitor Ccs, and the filter capacitor Ccs is connected in parallel to two ends of the resistor Rcs 2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021846065.5U CN213602553U (en) | 2020-08-30 | 2020-08-30 | Control circuit of parallel current-sharing power module |
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| CN202021846065.5U CN213602553U (en) | 2020-08-30 | 2020-08-30 | Control circuit of parallel current-sharing power module |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362541A (en) * | 2021-12-30 | 2022-04-15 | 天水七四九电子有限公司 | High-power module power supply parallel current-sharing circuit and control method |
| CN117955220A (en) * | 2024-03-25 | 2024-04-30 | 云南丁旺科技有限公司 | Charging pile power supply module current equalizing method and charging pile |
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2020
- 2020-08-30 CN CN202021846065.5U patent/CN213602553U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114362541A (en) * | 2021-12-30 | 2022-04-15 | 天水七四九电子有限公司 | High-power module power supply parallel current-sharing circuit and control method |
| CN114362541B (en) * | 2021-12-30 | 2023-11-24 | 天水七四九电子有限公司 | High-power module power supply parallel current equalizing circuit and control method |
| CN117955220A (en) * | 2024-03-25 | 2024-04-30 | 云南丁旺科技有限公司 | Charging pile power supply module current equalizing method and charging pile |
| CN117955220B (en) * | 2024-03-25 | 2024-06-11 | 云南丁旺科技有限公司 | Charging pile power supply module current equalizing method and charging pile |
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