CN217486398U

CN217486398U - AC/DC power module

Info

Publication number: CN217486398U
Application number: CN202221446401.6U
Authority: CN
Inventors: 伍杰
Original assignee: Gospower Digital Technology Shenzhen Co ltd
Current assignee: Gospower Digital Technology Shenzhen Co ltd
Priority date: 2022-06-10
Filing date: 2022-06-10
Publication date: 2022-09-23
Anticipated expiration: 2032-06-10

Abstract

The utility model discloses an AC/DC power supply module, which comprises a main circuit, a parallel pre-charging circuit, a first switch, a pre-charging pin, an AC input pin and a DC output pin, wherein the AC input end of the main circuit is connected with the AC input pin; the positive pole of the direct current output end of the main circuit is connected with a direct current output positive pin, and the negative pole of the direct current output end of the main circuit is connected with a direct current output negative pin through a contact of a first switch; the parallel pre-charging circuit comprises a current-limiting resistor, and the current-limiting resistor is connected between the negative electrode of the direct current output end of the main circuit and a pre-charging pin. The utility model discloses can restrict the transient state surge current when AC/DC power module inserts, realize the power hot plug, the security of circuit is good.

Description

AC/DC power module

[ technical field ]

The utility model relates to a direct current power supply system especially relates to an AC/DC power module.

[ background art ]

The dc power supply system supplies power to the devices of the communication station (station) from the dc power supply system. The direct current power supply system comprises an AC/DC power supply module, a storage battery, a direct current distribution panel and the like, and when the mains supply is interrupted, the storage battery independently supplies power to the communication equipment. The storage battery is usually in a full charge state, and when the commercial power is interrupted for a short time, the storage battery can ensure uninterrupted power supply. If the mains supply interruption period is too long, the AC/DC power supply module is powered by the oil engine generator set. The AC power supply of the AC/DC power supply module is introduced by an AC distribution panel, the output end of the AC/DC power supply module is connected with a storage battery and a load through a DC distribution panel, and the DC power supply mode widely applied at present is a parallel floating charging power supply mode. And the AC/DC power module is connected with the storage battery in parallel and then supplies power to the communication equipment. Under the condition that the commercial power is normal, the AC/DC power supply module supplies power to the communication equipment on one hand, and charges the storage battery on the other hand so as to supplement the electric quantity lost by the partial discharge of the storage battery. Under the parallel floating charging working state, the storage battery also provides a filtering function.

The output terminals of the AC/DC power supply module are normally connected to the terminals connected to the battery. However, as shown in fig. 1, a golden finger socket 11 is provided at the top of the AC/DC power module 10, and both the AC input terminal and the DC output terminal of the AC/DC power module are connected to the elastic contacts in the golden finger socket and are in a normally open state. When the AC/DC power supply module needs to be started, the starting circuit board 12 is inserted, the golden finger on the starting circuit board 12 is communicated with the corresponding contact in the golden finger socket 11, and the alternating current input end and the direct current output end of the AC/DC power supply module are connected.

The storage battery generally has higher voltage, and when the AC/DC power supply module is started after the starting circuit board is inserted, the voltage of the output capacitor of the AC/DC power supply module is close to zero. The resistance between the storage battery and the AC/DC power supply module is only the resistance of the conducting wire and the connector, the resistance value is very small, the storage battery is equivalent to an instant short circuit, and the instant current can reach thousands to tens of thousands of amperes. Such a large current, if not limited, will cause a huge impact load on power devices such as a battery, a system relay, a rectifier tube of an AC/DC power module, etc., which affects the life of circuit components and the safety of the circuit.

[ summary of the invention ]

The to-be-solved technical problem of the utility model is to provide a good AC/DC power module of security.

In order to solve the technical problem, the utility model adopts the technical scheme that an AC/DC power supply module comprises a main circuit, a parallel operation pre-charging circuit, a first switch, a pre-charging pin, an AC input pin and a DC output pin, wherein the AC input end of the main circuit is connected with the AC input pin; the positive pole of the direct current output end of the main circuit is connected with the direct current output positive pin, and the negative pole of the direct current output end of the main circuit is connected with the direct current output negative pin through the contact of the first switch; the parallel machine pre-charging circuit comprises a current-limiting resistor, and the current-limiting resistor is connected between the negative electrode of the direct current output end of the main circuit and a pre-charging pin.

In the AC/DC power supply module, the pre-charging circuit includes a diode, the first end of the current-limiting resistor is connected to the negative electrode of the DC output terminal of the main circuit, the second end of the current-limiting resistor is connected to the anode of the diode, and the cathode of the diode is connected to the pre-charging pin.

In the above AC/DC power supply module, the current-limiting resistor is a positive temperature coefficient thermistor.

The AC/DC power supply module comprises a golden finger socket and a starting circuit board, wherein the plugboard of the starting circuit board and the golden finger socket form 6 spliced switches, the golden finger socket comprises a contact of the first switch and contacts of the other 5 switches, and the plugboard of the starting circuit board comprises 6 pairs of golden fingers matched with the corresponding switch contacts; the positive pole of the direct current output end of the main circuit is connected with a direct current output positive pin through the contact of the second switch, and the cathode of the diode of the pre-charging circuit is connected with the pre-charging pin through the contact of the third switch; the live wire at the alternating current input end of the main circuit is connected with a live wire pin of alternating current input through a contact point of a fourth switch, the zero line at the alternating current input end of the main circuit is connected with a zero line pin of alternating current input through a contact point of a fifth switch, and the ground wire at the alternating current input end of the main circuit is connected with a ground wire pin of alternating current input through a contact point of a sixth switch; the distance between the gold finger matched with the contact of the first switch and the lower end of the plug board is greater than the distance between the other gold fingers and the lower end of the plug board.

The utility model discloses can restrict the transient state surge current when AC/DC power module inserts, realize the power hot plug, the security of circuit is good.

[ description of the drawings ]

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.

FIG. 1 is a front view of a prior art AC/DC power module.

Fig. 2 is a circuit block diagram of an AC/DC power module according to an embodiment of the present invention.

Fig. 3 is a front view of a board insertion portion of a start-up circuit board according to an embodiment of the present invention.

Fig. 4 is a rear view of a board insertion portion of a starting circuit board according to an embodiment of the present invention.

[ detailed description of the invention ]

The embodiment of the utility model provides a circuit structure of AC/DC power module is as shown in fig. 2 to fig. 4, including main circuit, parallel operation pre-charging circuit, golden finger socket and starting circuit board 12.

The main circuit comprises an input filter circuit, a PFC circuit, an LLC circuit and an output rectifying circuit. The plugboard of the starting circuit board and the golden finger socket form 6 inserted switches, the 6 switch elastic contacts are arranged in the golden finger socket, and 6 pairs of golden fingers matched with the 6 switch elastic contacts are arranged on the plugboard 121 of the starting circuit board 12.

As shown in FIG. 2, the pre-charging circuit includes a diode D1 and a PTC thermistor PT1, the first terminal of the PTC thermistor PT1 is connected to the negative electrode V-of the DC output terminal of the main circuit, and the second terminal of the PTC thermistor PT1 is connected to the anode of the diode D1.

The negative pole V-of the direct current output end of the main circuit is connected with a direct current output negative pin VOUT-through a contact point of a first switch K1. The positive pole V + of the direct current output end of the main circuit is connected with a direct current output positive pin VOUT + through a contact point of a second switch K2, and the cathode of a PRE-charging circuit diode D1 is connected with a PRE-charging pin PRE-CHARGE through a contact point of a third switch K3. The live wire L1 of the AC input end of the main circuit is connected with the live wire pin L of the AC input through the contact of the fourth switch K4, the zero line N1 of the AC input end of the main circuit is connected with the zero line pin N of the AC input through the contact of the fifth switch K5, and the ground wire G1 of the AC input end of the main circuit is connected with the ground wire pin CHGND of the AC input through the contact of the sixth switch K6.

As shown in fig. 3 and 4, the board 121 of the start circuit board 12 includes 6 pairs of gold fingers. The first pair of gold fingers 1 matches with the contacts of the first switch K1, the second pair of gold fingers 2 matches with the contacts of the second switch K2, the third pair of gold fingers 3 matches with the contacts of the third switch K3, the fourth pair of gold fingers 4 matches with the contacts of the fourth switch K4, the fifth pair of gold fingers 5 matches with the contacts of the fifth switch K5, and the sixth pair of gold fingers 6 matches with the contacts of the sixth switch K6.

The distance from the lower end of the plug board 121 to the golden finger 1 matched with the contact of the first switch K1 is greater than the distance from the other golden fingers 2 to 6 to the lower end of the plug board 121.

The current limiting resistor of the pre-charging circuit is used for suppressing surge current at the power-on moment, and the diode D1 selects a fast recovery diode to ensure unidirectional flow of current. The maximum value of the surge current is equal to U/R (U is the current voltage of the storage battery of the direct current power supply system, and R is the resistance value of a pre-charging circuit current limiting resistor PT 1), the maximum value of the transient surge current is smaller than the rated current value of the output electrolytic capacitor, so the minimum value of R can be determined, and the current is gradually reduced along with the increase of the voltage of the battery. In the power supply module, a positive temperature coefficient thermistor (PTC) is commonly used at the position of PT1 in fig. 2. When the switching power supply is started, the resistance value of the PTC is not large, so that the transient surge current can be limited, the resistance value of the PTC is increased along with the self heating of the PTC, the transient surge current is limited at a lower level, and meanwhile, the voltage of the whole system can not be reduced.

When the plug board 121 of the starting circuit board 12 is just inserted into the gold finger socket, the longer gold fingers 2 to 6 are firstly connected with the switches K2-K6, and the current returns to the negative electrode V-of the main circuit dc output end from the positive electrode V + of the main circuit dc output end, the dc output positive pin VOUT +, the dc output negative pin VOUT-, the resistor PT1 and the diode D1 to flow back to the power module, so as to form a current loop. The current limiting resistor PT1 plays a role in limiting backward flow current, and current overshoot is avoided from damaging the secondary synchronous rectification MOSFET. When the plug board 121 of the starting circuit board 12 is completely inserted into the golden finger socket, the golden finger 1 is also communicated with the contact of the first switch K1, that is, the current directly returns to the negative electrode V-of the main circuit dc output end from the positive electrode V + of the main circuit dc output end, the dc output positive pin VOUT +, the dc output negative pin VOUT-to pour the power module backward, the pre-charging circuits PT1 and D1 are short-circuited, and the current loop does not leave the pre-charging circuit any more. Due to the existence of the pre-charging circuit, the plug board 121 of the starting circuit board 12 can well protect the battery and the power module when just being inserted into the golden finger socket; when the plug board 121 of the starting circuit board 12 is completely inserted into the gold finger socket, the output voltage of the power module is clamped by the voltage of the battery, the difference of the potential difference is not too much, no overlarge transient surge current is generated, and the pre-charging function is well realized.

Claims

1. An AC/DC power supply module comprises a main circuit, an AC input pin and a DC output pin, wherein the AC input end of the main circuit is connected with the AC input pin; the parallel operation pre-charging circuit is characterized by comprising a parallel operation pre-charging circuit, a first switch and a pre-charging pin, wherein the positive pole of the direct current output end of the main circuit is connected with a direct current output positive pin, and the negative pole of the direct current output end of the main circuit is connected with a direct current output negative pin through a contact of the first switch; the parallel pre-charging circuit comprises a current-limiting resistor, and the current-limiting resistor is connected between the negative electrode of the direct current output end of the main circuit and a pre-charging pin.

2. The AC/DC power supply module according to claim 1, wherein the pre-charge circuit comprises a diode, a first terminal of the current-limiting resistor is connected to the negative electrode of the DC output terminal of the main circuit, a second terminal of the current-limiting resistor is connected to the anode of the diode, and the cathode of the diode is connected to the pre-charge pin.

3. The AC/DC power module of claim 1, wherein said current limiting resistor is a positive temperature coefficient thermistor.

4. The AC/DC power supply module according to claim 2, comprising a golden finger socket and a starting circuit board, wherein the plugboard of the starting circuit board and the golden finger socket form 6 plugged switches, the golden finger socket comprises a contact of the first switch and contacts of the other 5 switches, and the plugboard of the starting circuit board comprises 6 pairs of golden fingers matched with the corresponding switch contacts; the positive pole of the direct current output end of the main circuit is connected with a direct current output positive pin through the contact of the second switch, and the cathode of the diode of the pre-charging circuit is connected with the pre-charging pin through the contact of the third switch; the live wire at the alternating current input end of the main circuit is connected with a live wire pin of alternating current input through a contact of a fourth switch, the zero line at the alternating current input end of the main circuit is connected with a zero line pin of alternating current input through a contact of a fifth switch, and the ground wire at the alternating current input end of the main circuit is connected with a ground wire pin of alternating current input through a contact of a sixth switch; the distance between the gold finger matched with the contact of the first switch and the lower end of the plug board is greater than the distance between the other gold fingers and the lower end of the plug board.