CN209497392U - A kind of external drive circuit of DC-DC converter synchronous rectification - Google Patents

A kind of external drive circuit of DC-DC converter synchronous rectification Download PDF

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Publication number
CN209497392U
CN209497392U CN201821714258.8U CN201821714258U CN209497392U CN 209497392 U CN209497392 U CN 209497392U CN 201821714258 U CN201821714258 U CN 201821714258U CN 209497392 U CN209497392 U CN 209497392U
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converter
transformer
capacitor
signal
circuit
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苏治华
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Shenzhen Huawei Industrial Technology Co Ltd
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Shenzhen Huawei Industrial Technology Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Dc-Dc Converters (AREA)
  • Rectifiers (AREA)

Abstract

The utility model discloses a kind of external drive circuits of DC-DC converter synchronous rectification, including DC converter and for the drive module of the DC converter；The drive module includes PWM controller, negative interception unit U1-U2 reverse phase power drive unit U3-U4, signal-isolated transmission element circuit U5；The pulse signal that the PWM controller generates controls the primary circuit of the DC converter；The pulse signal that the PWM controller generates passes through the fluctuating signal that the signal-isolated transmission element circuit U5 generates polarity inversion simultaneously, then its negative sense driving signal is intercepted after being handled by the negative sense interception unit circuit U 1-U2, obtain two groups of forward driving signals of polarity complementation, again by driving the synchronous rectifier of the DC converter after the reverse phase power drive unit U3-U4 paraphase, and then control the conducting and cut-off of the DC converter secondary circuit；The utility model can obtain front and back along oblique adjustable driving pulse without dedicated driving IC by discrete component.

Description

A kind of external drive circuit of DC-DC converter synchronous rectification
Technical field
The utility model relates to arrive the external drive technical field more particularly to a kind of DC-DC converter of DC converting The external drive circuit of synchronous rectification.
Background technique
Circuit components used in the synchronous rectification external drive road of current single-end ortho-exciting DC-DC converter are more, Lead to cost increase, functional reliability is lower.
Therefore, the prior art is defective, needs to improve.
Utility model content
The utility model provides a kind of external drive circuit of DC-DC converter synchronous rectification, the above problem of solution.
To solve the above problems, the technical scheme that the utility model is provided is as follows:
A kind of external drive circuit of DC-DC converter synchronous rectification, including DC converter and for the direct current become The drive module of parallel operation；The drive module includes PWM controller, negative interception unit U1-U2 reverse phase power drive unit U3- U4, signal-isolated transmission element circuit U5；The pulse signal that the PWM controller generates controls the primary side of the DC converter Circuit；It is anti-that the pulse signal that the PWM controller generates generates polarity by the signal-isolated transmission element circuit U5 simultaneously The fluctuating signal of phase intercepts its negative sense driving signal after then being handled by the negative sense interception unit circuit U 1-U2, obtains Two groups of forward driving signals of polarity complementation, then by driving the direct current after the reverse phase power drive unit U3-U4 paraphase The synchronous rectifier of converter, and then control the conducting and cut-off of the DC converter secondary circuit.
Preferred technical solution, the DC converter include main transformer T11, inductance Lo, capacitor Co, Cin and crystal Pipe Q1-Q3.
Preferred technical solution, input power anode respectively with the first end of the capacitor Cin, the main transformer The first end of T11 armature winding connects；The drain electrode of the second end of the main transformer T11 armature winding and the transistor Q3 connect It connects；The cathode of input power is connect with the source electrode of the second end of the capacitor Cin, the transistor Q3 respectively；The main transformer pressure The first end of device T11 secondary windings is connect with the first end of the drain electrode of the transistor Q2, the inductance Lo respectively；The inductance The second end of Lo is connect with the anode of the first end of the capacitor Co, power output end respectively；T11 grade of the main transformer around The second end of group is connect with the drain electrode of the transistor Q1；The source electrode of the transistor Q1 source with the transistor Q2 respectively The cathode connection of pole, the second end of the capacitor Co, power output end.
Preferred technical solution, the transistor Q1-Q3 are the enhanced metal-oxide-semiconductor of N-channel.
Preferred technical solution, the signal-isolated transmission module U5 include capacitor C1x and the isolation for coupling buffer action The transformer T1 of driving effect.
Preferred technical solution, the second end of the capacitor C1x are connect with a tap of the transformer T1 armature winding； The b tap and the first grounding connection of the transformer T1 armature winding；The f tap of the transformer T1 secondary windings connects with second Ground connection；First ground connection is grounded electrical isolation with the second end.
Beneficial effect compared with the existing technology is, using the above scheme, the circuit of the utility model external drive circuit Structure is simplified, and used component number is less, reduces manufacturing cost, improves functional reliability, is had wide Applicability；Front and back can be obtained by discrete component along oblique adjustable driving pulse without dedicated driving IC.
Detailed description of the invention
Illustrate embodiment or technical solution in the prior art in order to clearer, it below will be to embodiment or the prior art The required attached drawing used is briefly described in description, it is clear that, the accompanying drawings in the following description is only the one of utility model A little embodiments for those of ordinary skill in the art without creative efforts, can also be according to these Attached drawing obtains other attached drawings.
Fig. 1 is a kind of external drive circuit circuit diagram of DC-DC converter synchronous rectification of the utility model.
Specific embodiment
For the ease of understanding the utility model, in the following with reference to the drawings and specific embodiments, the utility model is carried out more detailed Thin explanation.The preferred embodiment of the utility model is given in attached drawing.But the utility model can be with many different Form is realized, however it is not limited to this specification described embodiment.On the contrary, purpose of providing these embodiments is makes to this The understanding of the disclosure of utility model is more thorough and comprehensive.
It should be noted that it can directly on the other element when element is referred to as " being fixed on " another element Or there may also be elements placed in the middle.When an element is considered as " connection " another element, it, which can be, is directly connected to To another element or it may be simultaneously present centering elements.Term used in this specification " fixation ", " integrated molding ", For illustrative purposes only, the similar unit of structure is to identical label in the figure for "left", "right" and similar statement Mark.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model The normally understood meaning of the technical staff in art field is identical.Art used in the description of the utility model in this specification Language, which is only for the purpose of describing specific embodiments, is not intended to limitation the utility model.
As shown in Figure 1, one embodiment of the utility model is:
A kind of external drive circuit of DC-DC converter synchronous rectification, including DC converter and for the direct current become The drive module of parallel operation；The drive module includes PWM controller, negative interception unit U1-U2 reverse phase power drive unit U3- U4, signal-isolated transmission element circuit U5；The pulse signal that the PWM controller generates controls the primary side of the DC converter Circuit；It is anti-that the pulse signal that the PWM controller generates generates polarity by the signal-isolated transmission element circuit U5 simultaneously The fluctuating signal of phase intercepts its negative sense driving signal after then being handled by the negative sense interception unit circuit U 1-U2, obtains Two groups of forward driving signals of polarity complementation, then by driving the direct current after the reverse phase power drive unit U3-U4 paraphase The synchronous rectifier of converter, and then control the conducting and cut-off of the DC converter secondary circuit.
The DC converter further includes main transformer T11, inductance Lo, capacitor Co, Cin and DC converter；
Input power anode respectively with the first end of the capacitor Cin, the main transformer T11 armature winding first End connection；The second end of the main transformer T11 armature winding is connect with the drain electrode of the transistor Q3；The cathode of input power It is connect respectively with the source electrode of the second end of the capacitor Cin, the transistor Q3；The of the main transformer T11 secondary windings One end is connect with the first end of the drain electrode of the transistor Q2, the inductance Lo respectively；The second end of the inductance Lo respectively with The anode connection of the first end, power output end of the capacitor Co；The second end of the main transformer T11 secondary windings with it is described The drain electrode of transistor Q1 connects；The source electrode of the transistor Q1 respectively with the source electrode of the transistor Q2, the capacitor Co The cathode connection at two ends, power output end；
The transistor Q1-Q3 is the enhanced metal-oxide-semiconductor of N-channel.
The DC converter further includes magnetic reset；The first end of the magnetic reset and the first end of the capacitor Cin connect It connects；The second end of the magnetic reset is connect with the drain electrode of the transistor Q3.
The signal-isolated transmission module U5 includes the capacitor C1x for coupling buffer action and the transformer of isolation drive effect T1；
The output end of the PWM controller is connect with the first end of the capacitor C1x；The transformer T1 secondary windings with The input terminal of the negative sense interception module connects；
The second end of the capacitor C1x is connect with a tap of the transformer T1 armature winding；The transformer T1 is primary The b tap and the first grounding connection of winding；The f tap and the second grounding connection of the transformer T1 secondary windings；Described first Ground connection is grounded electrical isolation with the second end.
The negative sense interception module includes negative sense interception unit U1 and negative sense interception unit U2；
The negative sense interception unit U1 includes capacitor C2x, resistance Rx1 and diode D1；The negative sense interception unit U2 packet Include capacitor C3x, resistance Rx2 and diode D2；
The d tap of the transformer T1 secondary windings is connect with the first end of the capacitor C2x；T1 grade of the transformer The c tap of winding is connect with the first end of the capacitor C3x；The f tap of the transformer T1 secondary windings and the diode The anode connection of D1；The input terminal of the reverse phase power driver module is connect with the cathode of the diode D1-D2 respectively；
The second end of the capacitor C2x is connect with the cathode of the first end of the resistance Rx1, the diode D1 respectively； The second end of the capacitor C3x is connect with the cathode of the second end of the resistance Rx2, the diode D2 respectively；Two pole Anode of the anode of pipe D1 respectively with the second end of the resistance Rx1, the first end of the resistance Rx2, the diode D2 connects It connects.
The reverse phase power driver module includes reverse phase power drive unit U3 and reverse phase power drive unit U4；
The reverse phase power drive unit U3, reverse phase power drive unit U4 are phase inverter；
The input terminal of the first reverse phase power drive unit U3 is connect with the cathode of the diode D1；Described first is anti- The output end of phase power drive unit U3 is connect with the grid of the transistor Q2；The second reverse phase power drive unit U4's Input terminal is connect with the cathode of the diode D2；The output end and the transistor of the second reverse phase power drive unit U4 The grid of Q1 connects；The output end of the PWM controller is connect with the grid of the transistor Q3.
Working principle of the utility model is:
The single fluctuating signal that PWM controller generates, is added in isolation drive transformer T1's by isolation coupling capacitor C1x On armature winding, while similar fluctuating signal is generated on the Same Name of Ends of isolation drive transformer T1 secondary windings, isolation is driven The fluctuating signal that polarity inversion is generated on the different name end of dynamic transformer T1 secondary windings, passes through negative sense interception unit circuit U 1 and U2 Its negative sense driving signal is intercepted after processing, obtains two groups of forward driving signals of polarity complementation, then pass through reverse phase power drive Output synchronous rectifier is driven after unit U3 and U4 paraphase, controls its conducting and cut-off.
The utility model is used to solve DC-DC converter in the prior art and passes through the driving signal for extracting one group of input stage, The technical problem of output synchronous rectifier is controlled by obtaining two groups of complementary driving signals after isolation processing, simultaneously because adopting With driving signal negative sense interception unit circuit, the driving voltage for solving output synchronous rectifier is influenced to cause to close by negative pressure Breakdown consumes larger problem；Since the gate drive voltage Vgs of external drive synchronous rectifier is not influenced by input voltage, keep away Self-device synchronous rectification scheme is exempted from when change range of input voltage is wider for duty, Vgs or too big or too small makes same The problem of rectifier loss increases is walked, the reliability of synchronous rectifier work is improved；On the other hand due to being driven outside synchronous rectification The pin of driving or PWM chip of the dynamic voltage signal from switching tube, the voltage waveform of synchronous rectification external drive are similar to Square wave reduces the alternate dead time of synchronous rectifier external drive voltage, improves the conversion effect of DC-DC converter work Rate.It has simple circuit, low in cost, high reliablity, applicability wide, can pass through discrete component without dedicated driving IC To obtain front and back along the adjustable driving pulse of slope, especially suitable for output in DC-DC converter using circuit of synchronous rectification function The driving of rate device.
It should be noted that above-mentioned each technical characteristic continues to be combined with each other, the various embodiments not being enumerated above are formed, It is accordingly to be regarded as the range of the utility model specification record；Also, it for those of ordinary skills, can be according to above stating It is bright to be improved or converted, and all these modifications and variations all should belong to the protection model of the appended claims for the utility model It encloses.

Claims (6)

1. a kind of external drive circuit of DC-DC converter synchronous rectification, which is characterized in that including DC converter and be used for institute State the drive module of DC converter；The drive module includes PWM controller, the drive of negative interception unit U1-U2 reverse phase power Moving cell U3-U4, signal-isolated transmission element circuit U5；The pulse signal that the PWM controller generates controls the direct current and becomes The primary circuit of parallel operation；The pulse signal that the PWM controller generates passes through the signal-isolated transmission element circuit U5 simultaneously The fluctuating signal of polarity inversion is generated, its negative sense is driven after then being handled by the negative interception unit circuit U 1-U2 and is believed Number interception, obtains two groups of forward driving signals of polarity complementation, then passes through the reverse phase power drive unit U3-U4 paraphase rear-guard The synchronous rectifier of the DC converter is moved, and then controls the conducting and cut-off of the DC converter secondary circuit；It is described Signal-isolated transmission module U5 includes the capacitor C1x for coupling buffer action and the transformer T1 of isolation drive effect；The capacitor The second end of C1x is connect with a tap of the transformer T1 armature winding；The b tap of the transformer T1 armature winding and the One grounding connection；The f tap and the second grounding connection of the transformer T1 secondary windings；First ground connection and the second end It is grounded electrical isolation.
2. a kind of external drive circuit of DC-DC converter synchronous rectification according to claim 1, which is characterized in that institute Stating DC converter includes main transformer T11, inductance Lo, capacitor Co, Cin and transistor Q1-Q3.
3. a kind of external drive circuit of DC-DC converter synchronous rectification according to claim 2, which is characterized in that defeated The anode for entering power supply is connect with the first end of the first end of the capacitor Cin, the main transformer T11 armature winding respectively；Institute The second end for stating main transformer T11 armature winding is connect with the drain electrode of the transistor Q3；The cathode of input power respectively with institute State the second end of capacitor Cin, the source electrode connection of the transistor Q3；The first end of the main transformer T11 secondary windings is distinguished It is connect with the first end of the drain electrode of the transistor Q2, the inductance Lo；The second end of the inductance Lo respectively with the capacitor The anode connection of the first end, power output end of Co；The second end of the main transformer T11 secondary windings and the transistor Q1 Drain electrode connection；The source electrode of the transistor Q1 respectively with the source electrode of the transistor Q2, the second end of the capacitor Co, power supply The cathode of output end connects.
4. a kind of external drive circuit of DC-DC converter synchronous rectification according to claim 3, which is characterized in that institute Stating transistor Q1-Q3 is the enhanced metal-oxide-semiconductor of N-channel.
5. a kind of external drive circuit of DC-DC converter synchronous rectification according to claim 1-4, feature It is, the signal-isolated transmission module U5 includes the capacitor C1x for coupling buffer action and the transformer T1 of isolation drive effect.
6. a kind of external drive circuit of DC-DC converter synchronous rectification according to claim 5, which is characterized in that institute The second end for stating capacitor C1x is connect with a tap of the transformer T1 armature winding；The b of the transformer T1 armature winding takes out Head and the first grounding connection；The f tap and the second grounding connection of the transformer T1 secondary windings；It is described first ground connection with it is described Second end is grounded electrical isolation.
CN201821714258.8U 2018-10-23 2018-10-23 A kind of external drive circuit of DC-DC converter synchronous rectification Active CN209497392U (en)

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Application Number Priority Date Filing Date Title
CN201821714258.8U CN209497392U (en) 2018-10-23 2018-10-23 A kind of external drive circuit of DC-DC converter synchronous rectification

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201821714258.8U CN209497392U (en) 2018-10-23 2018-10-23 A kind of external drive circuit of DC-DC converter synchronous rectification

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Publication Number Publication Date
CN209497392U true CN209497392U (en) 2019-10-15

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