CN206164388U

CN206164388U - Synchronous Rectifier chip

Info

Publication number: CN206164388U
Application number: CN201621253921.XU
Authority: CN
Inventors: 黄晓波
Original assignee: Chongqing Jialing New Technology Co Ltd
Current assignee: Chongqing Jialing New Technology Co Ltd
Priority date: 2016-11-14
Filing date: 2016-11-14
Publication date: 2017-05-10
Anticipated expiration: 2026-11-14

Abstract

The utility model discloses a synchronous Rectifier chip, including logic chip, logic chip includes first comparator, second comparator, RS trigger, multiplier, and synchronous Rectifier chip still includes MOS pipe, power supply pin, signal detection pin, inserting the non inverting input end of first comparator by the voltage signal of power supply pin input, inserting the inverting input end of first comparator by the voltage signal of signal detection pin input, the RS trigger is connected to the output of first comparator, still insert the non inverting input end of second comparator by the voltage signal of signal detection pin input, the inverting input termination ground of second comparator, the output connection RS trigger of second comparator, the multiplier is connected to the output of RS trigger, and the grid of MOS pipe is connected to the output of multiplier. This synchronous Rectifier chip internal integration MOS pipe and logic chip, through the output of the traditional schottky diode of MOS pipe replacement, the energy efficiency ratio is higher, and stability is stronger, the temperature rise of ability greatly reduced and the energy of saving the preciousness.

Description

A kind of synchronous rectification chip

Technical field

The utility model is related to a kind of synchronous rectification chip.

Background technology

Current synchronous rectification chip is substantially exported by Schottky diode, and Energy Efficiency Ratio is low, stability is poor, temperature Raise, not environmentally.

Utility model content

In view of drawbacks described above present in prior art, technical problem to be solved in the utility model is to provide one kind Synchronous rectification chip, is exported with solving existing synchronous rectification chip by Schottky diode, and Energy Efficiency Ratio is low, stability Difference, temperature rise, problem not environmentally.The utility model is achieved by the following technical solution：

A kind of synchronous rectification chip, including logic chip, the logic chip include first comparator, the second comparator, Rest-set flip-flop, multiplier, the synchronous rectification chip also includes metal-oxide-semiconductor, energization pins, signal detection pin；

The voltage signal being input into by the energization pins accesses the in-phase input end of the first comparator, by the signal The voltage signal of detection pin input accesses the inverting input of the first comparator, and the output end of the first comparator connects Connect the rest-set flip-flop；

The voltage signal being input into by the signal detection pin also accesses the in-phase input end of second comparator, described The reverse inter-input-ing ending grounding of the second comparator, the output end of second comparator connects the rest-set flip-flop；

The output end of the rest-set flip-flop connects the multiplier, and the output end of the multiplier connects the metal-oxide-semiconductor Grid.

Further, the synchronous rectification chip also includes undervoltage lockout circuit, and the undervoltage lockout circuit connection is described Energization pins, to detect the voltage signal being input into by the energization pins.

Further, the synchronous rectification chip also includes metal-oxide-semiconductor grid voltage controlling switch, the metal-oxide-semiconductor grid electricity Pressure controlling switch connects the grid of the metal-oxide-semiconductor, for receiving metal-oxide-semiconductor Gate voltage control signals and by the metal-oxide-semiconductor grid Voltage control signal is loaded into the grid of the metal-oxide-semiconductor.

Further, the synchronous rectification chip also includes Voltage Reference pin, and the Voltage Reference pin connection is described Rest-set flip-flop.

Further, the synchronous rectification chip also includes grounding pin and drain electrode output pin；The metal-oxide-semiconductor is N-type Metal-oxide-semiconductor, the source electrode of the N-type metal-oxide-semiconductor is grounded by the grounding pin；The drain electrode output pin and the N-type metal-oxide-semiconductor Drain electrode connection.

Compared with prior art, the utility model is provided the integrated metal-oxide-semiconductor of synchronous rectification chip internal and logic chip, lead to Cross metal-oxide-semiconductor and replace conventional schottky output, Energy Efficiency Ratio is higher, and stability is higher, temperature rise can be substantially reduced and save precious The expensive energy, is the optimal selection of new forms of energy Power Management Design scheme.

Description of the drawings

Fig. 1：The circuit theory schematic diagram of the synchronous rectification chip that the utility model embodiment is provided.

Specific embodiment

Below in conjunction with accompanying drawing in the utility model embodiment, the technical scheme in the utility model embodiment is carried out clearly Chu, it is fully described by.Obviously, described embodiment is only a part of embodiment of the utility model, rather than the reality of whole Apply example.The component of the utility model embodiment generally described and illustrated in accompanying drawing herein can be come with a variety of configurations Arrangement and design.Therefore, the detailed description of embodiment of the present utility model below to providing in the accompanying drawings is not intended to limit Claimed scope of the present utility model, but it is merely representative of selected embodiment of the present utility model.Based on the utility model Embodiment, the every other embodiment that those skilled in the art are obtained on the premise of creative work is not made, all Belong to the scope of the utility model protection.

In description of the present utility model, it should be noted that unless otherwise clearly defined and limited, term " connection " Should be interpreted broadly, for example, it may be being fixedly connected, or being detachably connected, or be integrally connected；Can be that machinery connects Connect, or electrically connect；Can be directly connected to, it is also possible to be indirectly connected with by intermediary, or two elements Internal connection.For the ordinary skill in the art, can as the case may be understand above-mentioned term in this practicality Concrete meaning in new.

As shown in figure 1, the utility model embodiment provides a kind of synchronous rectification chip, including logic chip, logic core Piece includes first comparator 12, the second comparator 10, rest-set flip-flop 8, multiplier 7.The synchronous rectification chip also include metal-oxide-semiconductor 5, Energization pins 1, signal detection pin 11.

The voltage signal being input into by energization pins 1 accesses the in-phase input end of first comparator 12, by signal detection pin The voltage signal of 11 inputs accesses the inverting input of first comparator 12, by the input signal of signal detection pin 11 with internal Reference voltage carries out contrast accounting in first comparator 12.The output end connection rest-set flip-flop 8 of first comparator 12.

The voltage signal being input into by signal detection pin 11 also accesses the in-phase input end of the second comparator 10, and second compares The reverse inter-input-ing ending grounding of device 10, the output end connection rest-set flip-flop 8 of the second comparator 10.

The output end connection multiplier 7 of rest-set flip-flop 8, the output end of multiplier 7 connects the grid of metal-oxide-semiconductor 5.

Used as a kind of preferred embodiment of the present embodiment, synchronous rectification chip also includes undervoltage lockout circuit 2, under-voltage lock Determine the connection energization pins 1 of circuit 2, to detect the voltage signal being input into by energization pins 1, undervoltage lockout circuit 2 is detecting this When voltage signal is less than predeterminated voltage, to avoid damaging synchronous rectification chip, by trigger protection action, the synchronous rectification chip is made Break-off, works on triggering synchronous rectification chip when the voltage signal meets or exceeds predeterminated voltage.

Synchronous rectification chip also includes metal-oxide-semiconductor grid voltage controlling switch 3, and metal-oxide-semiconductor grid voltage controlling switch 3 connects The grid of metal-oxide-semiconductor 5, for receiving metal-oxide-semiconductor Gate voltage control signals and metal-oxide-semiconductor Gate voltage control signals being loaded into into MOS The grid of pipe 5.Metal-oxide-semiconductor Gate voltage control signals, metal-oxide-semiconductor grid voltage control are input into by metal-oxide-semiconductor grid voltage controlling switch 3 Signal processed is a voltage signal, and with the output signal of multiplier 7 grid of metal-oxide-semiconductor 5 is together loaded into, so as to pass through to control the electricity The size of pressure signal turns on required threshold voltage come the metal-oxide-semiconductor 5 that makes for being set by the output of the output end of multiplier 7.

Synchronous rectification chip also includes Voltage Reference pin 9, the connection rest-set flip-flop 8 of Voltage Reference pin 9.By the voltage Low reference pin 9, adjusting external impedance can change and arrange the minimum deadline of metal-oxide-semiconductor 5.

Synchronous rectification chip also includes grounding pin 6 and drain electrode output pin 4.Metal-oxide-semiconductor 5 be N-type metal-oxide-semiconductor, N-type metal-oxide-semiconductor Source electrode be grounded by grounding pin 6.Drain electrode output pin 4 is connected with the drain electrode of N-type metal-oxide-semiconductor, and the drain electrode of the N-type metal-oxide-semiconductor is made Other equipment is arrived in output end output for the synchronous rectification chip.By the synchronous rectification chip output, will obtain than traditional High 2% Energy Efficiency Ratio is exported by Schottky diode, temperature rise can be substantially reduced and the valuable energy is saved, be new forms of energy power supply The optimal selection of design.

Finally it should be noted that：The various embodiments described above are merely to illustrate the technical solution of the utility model, rather than it is limited System；Although being described in detail to the utility model with reference to the foregoing embodiments, one of ordinary skill in the art should manage Solution：It still can modify to the technical scheme described in previous embodiment, or special to which part or whole technologies Levying carries out equivalent；And these are changed or are replaced, the essence disengaging the utility model for not making appropriate technical solution is respectively implemented The scope of example technical scheme.

Claims

1. a kind of synchronous rectification chip, it is characterised in that including logic chip, the logic chip include first comparator, the Two comparators, rest-set flip-flop, multiplier, the synchronous rectification chip also includes metal-oxide-semiconductor, energization pins, signal detection pin；

The voltage signal being input into by the energization pins accesses the in-phase input end of the first comparator, by the signal detection The voltage signal of pin input accesses the inverting input of the first comparator, the output end connection institute of the first comparator State rest-set flip-flop；

The voltage signal being input into by the signal detection pin also accesses the in-phase input end of second comparator, and described second The reverse inter-input-ing ending grounding of comparator, the output end of second comparator connects the rest-set flip-flop；

The output end of the rest-set flip-flop connects the multiplier, and the output end of the multiplier connects the grid of the metal-oxide-semiconductor.

2. synchronous rectification chip as claimed in claim 1, it is characterised in that the synchronous rectification chip also includes under-voltage locking Circuit, the undervoltage lockout circuit connects the energization pins, to detect the voltage signal being input into by the energization pins.

3. synchronous rectification chip as claimed in claim 1, it is characterised in that the synchronous rectification chip also includes metal-oxide-semiconductor grid Pole tension controlling switch, the metal-oxide-semiconductor grid voltage controlling switch connects the grid of the metal-oxide-semiconductor, for receiving metal-oxide-semiconductor grid The metal-oxide-semiconductor Gate voltage control signals are simultaneously loaded into the grid of the metal-oxide-semiconductor by voltage control signal.

4. synchronous rectification chip as claimed in claim 1, it is characterised in that the synchronous rectification chip also includes Voltage Reference Pin, the Voltage Reference pin connects the rest-set flip-flop.

5. synchronous rectification chip as claimed in claim 1, it is characterised in that the synchronous rectification chip also includes grounding pin With drain electrode output pin；The metal-oxide-semiconductor is N-type metal-oxide-semiconductor, and the source electrode of the N-type metal-oxide-semiconductor is grounded by the grounding pin；Institute State drain electrode output pin to be connected with the drain electrode of the N-type metal-oxide-semiconductor.