CN208806739U - Driving circuit, half-bridge topology Switching Power Supply and the electronic equipment of Switching Power Supply - Google Patents

Abstract

The application belongs to switch power technology field, is related to driving circuit, half-bridge topology Switching Power Supply and the electronic equipment of Switching Power Supply.The driving circuit of the Switching Power Supply includes: processor, upper arm driving circuit and lower arm driving circuit；The processor sends pulse-width signal to the upper arm driving circuit and the lower arm driving circuit respectively；The upper arm driving circuit includes: electric potential transfer circuit, totem discharge circuit, half push-pull driver circuit and fet gate discharge circuit；The processor sends pulse-width signal to the electric potential transfer circuit；The electric potential transfer circuit is electrically connected with the totem discharge circuit；The totem discharge circuit is electrically connected with half push-pull driver circuit；Half push-pull driver circuit is electrically connected with the fet gate discharge circuit；The electric potential transfer circuit is used to amplify the voltage value of the pulse-width signal.The driving circuit wiring of the Switching Power Supply is succinct.

Description

Driving circuit, half-bridge topology Switching Power Supply and the electronic equipment of Switching Power Supply

Technical field

The application belongs to switch power technology field, be related to the driving circuit of Switching Power Supply, half-bridge topology Switching Power Supply and Electronic equipment.

Background technique

Currently, the actuation techniques of the main switch field-effect tube of half-bridge topology Switching Power Supply have optocoupler driving, non-isolated bootstrapping Driving and single phase transformer driving.Above-mentioned three kinds of driving methods respectively have its disadvantage, and wherein optocoupler driving needs two-way isolated power supply It powers respectively to upper and lower arm driving circuit IC, therefore increases auxiliary power and overall routing difficulty, and drive optocoupler at present Output end has 500ns or so lag than signal input part, this is higher than the half-bridge topology Switching Power Supply of 100KHZ to switching frequency It is a very big technological deficiency, leads to that this drive scheme cannot be selected.Non-isolated bootstrapping driving is all application-specific integrated circuit scheme, such as IR2101, there are many kind model it can be selected that still upper lower arm voltage difference is all 600V hereinafter, this is not able to satisfy three-phase electricity input Half-bridge topology Switching Power Supply use condition.The shortcomings that single phase transformer scheme is the drive waveforms of upper lower arm driving circuit because being It is come out from the same transformer, has the phenomenon that interfering with each other, will lead to when serious and burn main switch field-effect tube.

Inventor has found during studying the application, the driving circuit of Switching Power Supply in the prior art or wiring Difficulty or signal output end lag 500ns or so than signal input part or are not able to satisfy the half-bridge topology of three-phase electricity input Switching Power Supply use condition or the drive waveforms of upper lower arm driving circuit are because be to come out to have mutually from the same transformer Interference.

Utility model content

Embodiments herein discloses the driving circuit of Switching Power Supply, half-bridge topology Switching Power Supply and electronic equipment, purport What is referred in solving the problems, such as background technique is of the existing technology.

One or more embodiment of the application discloses a kind of driving circuit of Switching Power Supply.The Switching Power Supply Driving circuit includes: processor, upper arm driving circuit and lower arm driving circuit；The processor sends pulsewidth modulation letter respectively Number to the upper arm driving circuit and the lower arm driving circuit；The upper arm driving circuit includes: electric potential transfer circuit, totem Column discharge circuit, half push-pull driver circuit and fet gate discharge circuit；The processor sends pulsewidth modulation letter Number to the electric potential transfer circuit；The electric potential transfer circuit is electrically connected with the totem discharge circuit；The totem is put Circuit is electrically connected with half push-pull driver circuit；Half push-pull driver circuit and the fet gate are discharged Circuit electrical connection；The electric potential transfer circuit is used to amplify the voltage value of the pulse-width signal；The totem column discharge electricity Road is used to amplify the current value of the pulse-width signal；Half push-pull driver circuit for exporting just in the on-state Voltage；The fet gate discharge circuit is used to discharge to fet gate；The lower arm driving circuit and it is described on Arm driving circuit construction is identical.

In one or more embodiment of the application, the electric potential transfer circuit include: comparator U1A, resistance R1, Resistance R2, resistance R3 and capacitor C1；The same phase of the comparator U1A is inputted by the pulse-width signal that the processor issues Input terminal；Power supply is accessed in one end of the resistance R1, and the other end of the resistance R1 connects one end of the resistance R2；The electricity Hinder the other end ground connection of R2；The capacitor C1 is connected in parallel on the both ends of the resistance R2；Between the resistance R1 and the resistance R2 Connect the inverting input terminal of the comparator U1A；The output end of the comparator U1A accesses the totem discharge circuit；Institute The one end for stating resistance R3 connects the output end of the comparator U1A, and the other end of the resistance R3 connects the totem column discharge The power input of circuit.

In one or more embodiment of the application, the totem discharge circuit includes: triode Q1, triode Q2, resistance R4 and resistance R5；The base stage of the triode Q1 connects the output end of the comparator U1A, the triode Q1 Collector be connected to the power input of the totem discharge circuit, the emitter connection described three of the triode Q1 The collector of pole pipe Q2；The base stage of the triode Q2 connects the output end of the comparator U1A, the transmitting of the triode Q2 Pole ground connection；One end of the resistance R4 is accessed between the emitter of the triode Q1 and the collector of the triode Q2, institute The other end for stating resistance R4 accesses half push-pull driver circuit；One end of the resistance R5 is grounded, and the resistance R5's is another Half push-pull driver circuit is accessed in one end.

In one or more embodiment of the application, half push-pull driver circuit includes: field-effect tube M1, becomes Depressor T1 and diode D1；The grid of the field-effect tube M1 connects the resistance R4 and resistance R5, the field-effect The drain electrode of pipe M1 connects 1 foot of the transformer T1, the source electrode ground connection of the field-effect tube M1；2 feet of the transformer T1 connect Ground, 3 feet of the transformer T1 connect the cathode of the diode D1, and 4 feet of the transformer T1 and 5 feet connect the field effect Answer tube grid discharge circuit；The plus earth of the diode D1.

In one or more embodiment of the application, the fet gate discharge circuit include: diode D2, Diode D3, diode D4, triode Q3, zener diode DV1, capacitor C2, resistance R6, resistance R7 and resistance R8；It is described The anode of diode D2 accesses 4 feet of the transformer T1, and the cathode of the diode D2 connects the capacitor C2；Two pole The cathode of pipe D3 accesses between 5 feet of the transformer T1 and the base stage of the triode Q3, and the anode of the diode D3 connects Become owner of the source electrode of switching field effect transistor；The base stage of the triode Q3 accesses 5 feet of the transformer T1, the triode Q3's Collector accesses between the cathode of the diode D2 and the capacitor C2, and the emitter of the triode Q3 accesses main switch field The source electrode of effect pipe；The zener diode DV1 is connected in parallel on the both ends of the capacitor C2；Described in one end access of the resistance R6 Between the cathode of diode D2 and the capacitor C2, the other end of the resistance R6 connects the cathode, described of the diode D3 The base stage of 5 feet of transformer T1 and the triode Q3；One end of the resistance R7 connects the capacitor C2, the resistance R7 The other end access the grid of the main switch field-effect tube；One end of the resistance R8 connects the anode of the diode D4, The other end of the resistance R8 accesses between the resistance R7 and the grid of the main switch field-effect tube；The diode D4's The source electrode of main switch field-effect tube described in cathode.

One or more embodiment of the application discloses a kind of half-bridge topology Switching Power Supply.The half-bridge topology switch Power supply includes the driving circuit of Switching Power Supply, the driving circuit of the Switching Power Supply include: processor, upper arm driving circuit and Lower arm driving circuit；The processor sends pulse-width signal to the upper arm driving circuit and lower arm driving electricity respectively Road；The upper arm driving circuit includes: electric potential transfer circuit, totem discharge circuit, half push-pull driver circuit and field effect Answer tube grid discharge circuit；The processor sends pulse-width signal to the electric potential transfer circuit；The current potential conversion electricity Road is electrically connected with the totem discharge circuit；The totem discharge circuit is electrically connected with half push-pull driver circuit； Half push-pull driver circuit is electrically connected with the fet gate discharge circuit；The electric potential transfer circuit is for amplifying The voltage value of the pulse-width signal；The totem discharge circuit is used to amplify the current value of the pulse-width signal； Half push-pull driver circuit for exporting positive voltage in the on-state；The fet gate discharge circuit be used for Fet gate electric discharge；The lower arm driving circuit is identical as the upper arm driving circuit construction.

One or more embodiment of the application discloses a kind of electronic equipment, is provided with half-bridge on the electronic equipment Topology Switch power supply, the half-bridge topology Switching Power Supply include the driving circuit of Switching Power Supply, the driving electricity of the Switching Power Supply Road includes: processor, upper arm driving circuit and lower arm driving circuit；The processor sends pulse-width signal to institute respectively State upper arm driving circuit and the lower arm driving circuit；The upper arm driving circuit includes: electric potential transfer circuit, totem column discharge Circuit, half push-pull driver circuit and fet gate discharge circuit；The processor sends pulse-width signal to institute State electric potential transfer circuit；The electric potential transfer circuit is electrically connected with the totem discharge circuit；The totem discharge circuit It is electrically connected with half push-pull driver circuit；Half push-pull driver circuit and fet gate discharge circuit electricity Connection；The electric potential transfer circuit is used to amplify the voltage value of the pulse-width signal；The totem discharge circuit is used for Amplify the current value of the pulse-width signal；Half push-pull driver circuit for exporting positive voltage in the on-state； The fet gate discharge circuit is used to discharge to fet gate；The lower arm driving circuit and the upper arm drive Circuit structure is identical.

Compared with prior art, technical solution disclosed in the present application mainly have it is following the utility model has the advantages that

In embodiments herein, the processor is sent to the pulse-width signal (PWM of the upper arm driving circuit Signal) enter the electric potential transfer circuit.Since the supply voltage of the processor is generally 5V, go out from the processor The voltage peak ratio 5V of the pulse-width signal come is low, if directly driving half push-pull driver circuit with the voltage peak, Then it is unable to reach the voltage requirement of half push-pull driver circuit.In embodiments herein, converted by the current potential Circuit amplifies the voltage value of the pulse-width signal, amplifies the pulse-width signal by the totem discharge circuit Current value enables half push-pull driver circuit to reach on state and export positive voltage.And then half push-pull type Driving circuit can drive the main switch field-effect tube of half-bridge topology Switching Power Supply.In embodiments herein, the switch The driving circuit of power supply constitutes dual transformer drive scheme by the upper arm driving circuit and the lower arm driving circuit, described The drive waveforms of upper arm driving circuit will not be interfered with each other with the drive waveforms of the lower arm driving circuit, do not easily led to and burnt out half The main switch field-effect tube of bridge Topology Switch power supply.In addition, the driving circuit wiring of the Switching Power Supply is succinct, signal output end It is almost synchronous with signal input part, moreover it is possible to meet the half-bridge topology Switching Power Supply use condition of three-phase electricity input.

Detailed description of the invention

Technical solution in ord to more clearly illustrate embodiments of the present application, below will be to needed in the embodiment attached Figure is briefly described, it should be apparent that, the drawings in the following description are only some examples of the present application, for this field For those of ordinary skill, without any creative labor, it can also be obtained according to these attached drawings other attached Figure.

Fig. 1 is a kind of schematic diagram of the driving circuit of Switching Power Supply in the embodiment of the application；

Fig. 2 is a kind of specific configuration figure of the driving circuit of Switching Power Supply in the embodiment of the application.

Description of symbols:

Specific embodiment

The application in order to facilitate understanding is described more fully the application below with reference to relevant drawings.In attached drawing Give the preferred embodiment of the application.But the application can realize in many different forms, however it is not limited to this paper institute The embodiment of description.On the contrary, purpose of providing these embodiments is keeps the understanding to disclosure of this application more thorough Comprehensively.

Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein The purpose of the embodiment of body, it is not intended that in limitation the application.

Currently, the actuation techniques of the main switch field-effect tube of half-bridge topology Switching Power Supply have optocoupler driving, non-isolated bootstrapping Driving and single phase transformer driving.Above-mentioned three kinds of driving methods respectively have its disadvantage, and wherein optocoupler driving needs two-way isolated power supply It powers respectively to upper and lower arm driving circuit IC, therefore increases auxiliary power and overall routing difficulty, and drive optocoupler at present Output end has 500ns or so lag than signal input part, this is higher than the half-bridge topology Switching Power Supply of 100KHZ to switching frequency It is a very big technological deficiency, leads to that this drive scheme cannot be selected.Non-isolated bootstrapping driving is all application-specific integrated circuit scheme, such as IR2101, there are many kind model it can be selected that still upper lower arm voltage difference is all 600V hereinafter, this is not able to satisfy three-phase electricity input Half-bridge topology Switching Power Supply use condition.The shortcomings that single phase transformer scheme is the drive waveforms of upper lower arm driving circuit because being It is come out from the same transformer, has the phenomenon that interfering with each other, will lead to when serious and burn main switch field-effect tube.

The embodiment of the application discloses a kind of driving circuit of Switching Power Supply.

It is a kind of schematic diagram of the driving circuit of Switching Power Supply in the embodiment of the application with reference to Fig. 1.

It anticipates as shown in fig. 1, the driving circuit of the Switching Power Supply includes: processor 100, upper arm driving circuit 200 And lower arm driving circuit 300；The processor 100 sends pulse-width signal to 200 He of upper arm driving circuit respectively The lower arm driving circuit 300；The upper arm driving circuit 200 includes: electric potential transfer circuit 210, totem discharge circuit 220, half push-pull driver circuit 230 and fet gate discharge circuit 240；The processor 100 sends pulsewidth modulation Signal is to the electric potential transfer circuit 210；The electric potential transfer circuit 210 is electrically connected with the totem discharge circuit 220；Institute Totem discharge circuit 220 is stated to be electrically connected with half push-pull driver circuit 230；Half push-pull driver circuit 230 with The fet gate discharge circuit 240 is electrically connected；The electric potential transfer circuit 210 is for amplifying the pulse-width signal Voltage value；The totem discharge circuit 220 is used to amplify the current value of the pulse-width signal；Half push-pull type is driven Dynamic circuit 230 for exporting positive voltage in the on-state；The fet gate discharge circuit 240 is used for field-effect tube Gate discharge；The lower arm driving circuit 300 constructs identical with the upper arm driving circuit 200.

In embodiments herein, the processor 100 is sent to the pulsewidth modulation letter of the upper arm driving circuit 200 Number (pwm signal) enters the electric potential transfer circuit 210.Since the supply voltage of the processor 100 is generally 5V, from The voltage peak ratio 5V for the pulse-width signal that the processor 100 comes out is low, if directly driving described half with the voltage peak Push-pull driver circuit 230 is then unable to reach the voltage requirement of half push-pull driver circuit 230.In the implementation of the application In example, amplify the voltage value of the pulse-width signal by the electric potential transfer circuit 210, passes through the totem column discharge electricity The current value of the pulse-width signal is amplified on road 220, and half push-pull driver circuit 230 is enabled to reach on state And export positive voltage.And then half push-pull driver circuit 230 can drive the main switch field of half-bridge topology Switching Power Supply to imitate Ying Guan.In embodiments herein, the driving circuit of the Switching Power Supply by the upper arm driving circuit 200 and it is described under Arm driving circuit 300 constitutes dual transformer drive scheme, and the drive waveforms of the upper arm driving circuit 200 will not be with the lower arm The drive waveforms of driving circuit 300 interfere with each other, and do not easily lead to the main switch field-effect tube for burning out half-bridge topology Switching Power Supply.This Outside, the driving circuit wiring of the Switching Power Supply is succinct, and signal output end is almost synchronous with signal input part, moreover it is possible to meet three-phase The half-bridge topology Switching Power Supply use condition of electricity input.

It is a kind of specific configuration figure of the driving circuit of Switching Power Supply in the embodiment of the application with reference to Fig. 2.

It anticipates as shown in Figure 2, the electric potential transfer circuit 210 includes: comparator U1A, resistance R1, resistance R2, resistance R3 and capacitor C1；The non-inverting input terminal of the comparator U1A is inputted by the pulse-width signal that the processor 100 issues； Power supply is accessed in one end of the resistance R1, and the other end of the resistance R1 connects one end of the resistance R2；The resistance R2's Other end ground connection；The capacitor C1 is connected in parallel on the both ends of the resistance R2；Institute is connected between the resistance R1 and the resistance R2 State the inverting input terminal of comparator U1A；The output end of the comparator U1A accesses the totem discharge circuit 220；The electricity One end of resistance R3 connects the output end of the comparator U1A, and the other end of the resistance R3 connects the totem discharge circuit 220 power input.

Anticipate as shown in Figure 2, the totem discharge circuit 220 include: triode Q1, triode Q2, resistance R4 with And resistance R5；The base stage of the triode Q1 connects the output end of the comparator U1A, the collector connection of the triode Q1 As the power input of the totem discharge circuit 220, the emitter of the triode Q1 connects the triode Q2's Collector；The base stage of the triode Q2 connects the output end of the comparator U1A, the emitter ground connection of the triode Q2； One end of the resistance R4 is accessed between the emitter of the triode Q1 and the collector of the triode Q2, the resistance R4 The other end access half push-pull driver circuit 230；One end of the resistance R5 is grounded, another termination of the resistance R5 Enter half push-pull driver circuit 230.

It anticipates as shown in Figure 2, half push-pull driver circuit 230 includes: field-effect tube M1, transformer T1 and two Pole pipe D1；The grid of the field-effect tube M1 connects the resistance R4 and resistance R5, and the drain electrode of the field-effect tube M1 connects Connect 1 foot of the transformer T1, the source electrode ground connection of the field-effect tube M1；2 feet of the transformer T1 are grounded, the transformer 3 feet of T1 connect the cathode of the diode D1, and 4 feet of the transformer T1 and 5 feet connect the fet gate electric discharge Circuit 240；The plus earth of the diode D1.

It anticipates as shown in Figure 2, the fet gate discharge circuit 240 includes: diode D2, diode D3, two Pole pipe D4, triode Q3, zener diode DV1, capacitor C2, resistance R6, resistance R7 and resistance R8；The diode D2 is just 4 feet of the transformer T1 are accessed in pole, and the cathode of the diode D2 connects the capacitor C2；The cathode of the diode D3 connects Enter between 5 feet of the transformer T1 and the base stage of the triode Q3, the anode access main switch field effect of the diode D3 Should pipe source electrode (M3-S)；The base stage of the triode Q3 accesses 5 feet of the transformer T1, the collector of the triode Q3 It accesses between the cathode of the diode D2 and the capacitor C2, the emitter of the triode Q3 accesses main switch field-effect tube Source electrode；The zener diode DV1 is connected in parallel on the both ends of the capacitor C2；The diode is accessed in one end of the resistance R6 Between the cathode of D2 and the capacitor C2, the other end of the resistance R6 connects the cathode of the diode D3, the transformer The base stage of 5 feet of T1 and the triode Q3；One end of the resistance R7 connects the capacitor C2, and the resistance R7's is another Terminate the grid (M3-G) into the main switch field-effect tube；One end of the resistance R8 connects the anode of the diode D4, The other end of the resistance R8 accesses between the resistance R7 and the grid of the main switch field-effect tube；The diode D4's The source electrode of main switch field-effect tube described in cathode.

The construction of the lower arm driving circuit 300 please refers to the understanding of the circuit arrangement in Fig. 2.

With continued reference to Fig. 2, the resistance R1, the resistance R2 and the capacitor C1 constitute a resistor voltage divider circuit, The resistor voltage divider circuit makes the pressure drop of the resistance R2 be 1V to 3V.

With continued reference to Fig. 2, the electric current of the comparator U1A is 10mA or so, and the resistance value of the resistance R3 is VCC/10mA.

With continued reference to Fig. 2, it is 3A~6A that the field-effect tube M1, which selects electric current, and pressure-resistant range is the N-channel of 50V~100V Field-effect tube.

With continued reference to Fig. 2, the diode D2 and the diode D3 are fast recovery diode, are also possible to Schottky two Pole pipe.The electric current of the diode D2 and the diode D3 are 1A, and pressure resistance is greater than 50V.

With continued reference to Fig. 2, in order to allow the triode Q3 quickly to discharge M3-G, the resistance value of the resistance R6 cannot mistake Greatly, generally in 470 Ω to 1000 Ω.With continued reference to Fig. 2, the zener diode DV1 is generally chosen to be 5.1V/0.5W.It is described Capacitor C2 is 0.1 microfarad to 1 microfarad.

With continued reference to Fig. 2, the resistance R3 is generally chosen to be 10 Ω to 100 Ω.

With continued reference to Fig. 2, the resistance R8 and the diode D4 constitute the uneven charging under switch state.Opening shape Under state, the resistance R8 and the diode D4 charge to the capacitor C2.Under open state, current loop is: transformer T1 4 feet → diode D2 → capacitor C2, zener diode DV1 → (M3-G, M3-S) // (resistance R8, diode D4) → diode 5 feet of D3 → transformer T1.Under off status, the diode D4 cut-off, the capacitor C2 stores constant electricity to be formed Turn off negative pressure.Under off status, current loop is: M3-G → resistance R7 → capacitor C2 → resistance R6, triode Q3 → M3-S.

With continued reference to Fig. 2, when transformer T1 work is in normal shock state, the diode D1 assists the transformer T1 Complete magnetic reset.The operating condition of half push-pull driver circuit 230 is that the maximum duty cycle of the pulse-width signal is 50%, when the maximum duty of the pulse-width signal is greater than 50%, the transformer T1 cannot complete magnetic reset.The switch The upper arm driving circuit 200 of the driving circuit of power supply and the pulse-width signal of lower arm driving circuit 300 are respectively less than 50%, meet The transformer T1 completes the condition of magnetic reset.

With continued reference to Fig. 2, the capacitor C2, the zener diode DV1, the resistance R8, the diode D4 are constituted Negative voltage generating circuit provides negative pressure for the main switch field-effect tube and turns off voltage, improves anti-interference.

The embodiment of the application discloses a kind of half-bridge topology Switching Power Supply.

In conjunction with Fig. 2, the half-bridge topology Switching Power Supply includes the driving circuit of Switching Power Supply, the driving of the Switching Power Supply Circuit includes: processor 100, upper arm driving circuit 200 and lower arm driving circuit 300；The processor 100 sends arteries and veins respectively Wide modulated signal is to the upper arm driving circuit 200 and the lower arm driving circuit 300.

The upper arm driving circuit 200 includes: electric potential transfer circuit 210, totem discharge circuit 220, the drive of half push-pull type Dynamic circuit 230 and fet gate discharge circuit 240；The processor 100 sends pulse-width signal to the current potential Conversion circuit 210；The electric potential transfer circuit 210 is electrically connected with the totem discharge circuit 220；The totem column discharge electricity Road 220 is electrically connected with half push-pull driver circuit 230；Half push-pull driver circuit 230 and the field-effect tube grid Pole discharge circuit 240 is electrically connected.

The electric potential transfer circuit 210 is used to amplify the voltage value of the pulse-width signal；The totem column discharge electricity Road 220 is used to amplify the current value of the pulse-width signal；Half push-pull driver circuit 230 is in the on-state Export positive voltage；The fet gate discharge circuit 240 is used to discharge to fet gate；The lower arm driving circuit 300 constructed with the upper arm driving circuit 200 it is identical.

Further, the electric potential transfer circuit 210 includes: comparator U1A, resistance R1, resistance R2, resistance R3 and electricity Hold C1；The non-inverting input terminal of the comparator U1A is inputted by the pulse-width signal that the processor 100 issues；The resistance Power supply is accessed in one end of R1, and the other end of the resistance R1 connects one end of the resistance R2；Another termination of the resistance R2 Ground；The capacitor C1 is connected in parallel on the both ends of the resistance R2；The comparator is connected between the resistance R1 and the resistance R2 The inverting input terminal of U1A；The output end of the comparator U1A accesses the totem discharge circuit 220；The one of the resistance R3 End connects the output end of the comparator U1A, and the other end of the resistance R3 connects the power supply of the totem discharge circuit 220 Input terminal.

Further, the totem discharge circuit 220 includes: triode Q1, triode Q2, resistance R4 and resistance R5；The base stage of the triode Q1 connects the output end of the comparator U1A, and the collector of the triode Q1 is connected to institute The power input of totem discharge circuit 220 is stated, the emitter of the triode Q1 connects the collector of the triode Q2； The base stage of the triode Q2 connects the output end of the comparator U1A, the emitter ground connection of the triode Q2；The resistance One end of R4 is accessed between the emitter of the triode Q1 and the collector of the triode Q2, the other end of the resistance R4 Access half push-pull driver circuit 230；One end of the resistance R5 is grounded, the other end access described half of the resistance R5 Push-pull driver circuit 230.

Further, half push-pull driver circuit 230 includes: field-effect tube M1, transformer T1 and diode D1； The grid of the field-effect tube M1 connects the resistance R4 and resistance R5, and the drain electrode of the field-effect tube M1 connects the change 1 foot of depressor T1, the source electrode ground connection of the field-effect tube M1；2 feet of the transformer T1 are grounded, 3 feet of the transformer T1 The cathode of the diode D1 is connected, 4 feet of the transformer T1 and 5 feet connect the fet gate discharge circuit 240； The plus earth of the diode D1.

Further, the fet gate discharge circuit 240 include: diode D2, diode D3, diode D4, Triode Q3, zener diode DV1, capacitor C2, resistance R6, resistance R7 and resistance R8；The anode access of the diode D2 The cathode of 4 feet of the transformer T1, the diode D2 connects the capacitor C2；Described in the cathode access of the diode D3 Between 5 feet of transformer T1 and the base stage of the triode Q3, the anode access main switch field-effect tube of the diode D3 Source electrode (M3-S)；The base stage of the triode Q3 accesses 5 feet of the transformer T1, and the collector of the triode Q3 accesses institute It states between the cathode of diode D2 and the capacitor C2, the source of the emitter access main switch field-effect tube of the triode Q3 Pole；The zener diode DV1 is connected in parallel on the both ends of the capacitor C2；The diode D2's accessed in one end of the resistance R6 Between cathode and the capacitor C2, the other end of the resistance R6 connect the cathode of the diode D3, the transformer T1 5 The base stage of foot and the triode Q3；One end of the resistance R7 connects the capacitor C2, another termination of the resistance R7 Enter the grid (M3-G) of the main switch field-effect tube；One end of the resistance R8 connects the anode of the diode D4, described The other end of resistance R8 accesses between the resistance R7 and the grid of the main switch field-effect tube；The cathode of the diode D4 The source electrode of the main switch field-effect tube.

The embodiment of the application discloses a kind of electronic equipment.

In conjunction with Fig. 2, half-bridge topology Switching Power Supply is provided on the electronic equipment, the half-bridge topology Switching Power Supply includes The driving circuit of Switching Power Supply.The driving circuit of the Switching Power Supply include: processor 100, upper arm driving circuit 200 and under Arm driving circuit 300；The processor 100 send respectively pulse-width signal to the upper arm driving circuit 200 and it is described under Arm driving circuit 300.

The upper arm driving circuit 200 includes: electric potential transfer circuit 210, totem discharge circuit 220, the drive of half push-pull type Dynamic circuit 230 and fet gate discharge circuit 240；The processor 100 sends pulse-width signal to the current potential Conversion circuit 210；The electric potential transfer circuit 210 is electrically connected with the totem discharge circuit 220；The totem column discharge electricity Road 220 is electrically connected with half push-pull driver circuit 230；Half push-pull driver circuit 230 and the field-effect tube grid Pole discharge circuit 240 is electrically connected.

The electric potential transfer circuit 210 is used to amplify the voltage value of the pulse-width signal；The totem column discharge electricity Road 220 is used to amplify the current value of the pulse-width signal；Half push-pull driver circuit 230 is in the on-state Export positive voltage；The fet gate discharge circuit 240 is used to discharge to fet gate；The lower arm driving circuit 300 constructed with the upper arm driving circuit 200 it is identical.

Further, the electric potential transfer circuit 210 includes: comparator U1A, resistance R1, resistance R2, resistance R3 and electricity Hold C1；The non-inverting input terminal of the comparator U1A is inputted by the pulse-width signal that the processor 100 issues；The resistance Power supply is accessed in one end of R1, and the other end of the resistance R1 connects one end of the resistance R2；Another termination of the resistance R2 Ground；The capacitor C1 is connected in parallel on the both ends of the resistance R2；The comparator is connected between the resistance R1 and the resistance R2 The inverting input terminal of U1A；The output end of the comparator U1A accesses the totem discharge circuit 220；The one of the resistance R3 End connects the output end of the comparator U1A, and the other end of the resistance R3 connects the power supply of the totem discharge circuit 220 Input terminal.

Further, the totem discharge circuit 220 includes: triode Q1, triode Q2, resistance R4 and resistance R5；The base stage of the triode Q1 connects the output end of the comparator U1A, and the collector of the triode Q1 is connected to institute The power input of totem discharge circuit 220 is stated, the emitter of the triode Q1 connects the collector of the triode Q2； The base stage of the triode Q2 connects the output end of the comparator U1A, the emitter ground connection of the triode Q2；The resistance One end of R4 is accessed between the emitter of the triode Q1 and the collector of the triode Q2, the other end of the resistance R4 Access half push-pull driver circuit 230；One end of the resistance R5 is grounded, the other end access described half of the resistance R5 Push-pull driver circuit 230.

Further, half push-pull driver circuit 230 includes: field-effect tube M1, transformer T1 and diode D1； The grid of the field-effect tube M1 connects the resistance R4 and resistance R5, and the drain electrode of the field-effect tube M1 connects the change 1 foot of depressor T1, the source electrode ground connection of the field-effect tube M1；2 feet of the transformer T1 are grounded, 3 feet of the transformer T1 The cathode of the diode D1 is connected, 4 feet of the transformer T1 and 5 feet connect the fet gate discharge circuit 240； The plus earth of the diode D1.

Further, the fet gate discharge circuit 240 include: diode D2, diode D3, diode D4, Triode Q3, zener diode DV1, capacitor C2, resistance R6, resistance R7 and resistance R8；The anode access of the diode D2 The cathode of 4 feet of the transformer T1, the diode D2 connects the capacitor C2；Described in the cathode access of the diode D3 Between 5 feet of transformer T1 and the base stage of the triode Q3, the anode access main switch field-effect tube of the diode D3 Source electrode (M3-S)；The base stage of the triode Q3 accesses 5 feet of the transformer T1, and the collector of the triode Q3 accesses institute It states between the cathode of diode D2 and the capacitor C2, the source of the emitter access main switch field-effect tube of the triode Q3 Pole；The zener diode DV1 is connected in parallel on the both ends of the capacitor C2；The diode D2's accessed in one end of the resistance R6 Between cathode and the capacitor C2, the other end of the resistance R6 connect the cathode of the diode D3, the transformer T1 5 The base stage of foot and the triode Q3；One end of the resistance R7 connects the capacitor C2, another termination of the resistance R7 Enter the grid (M3-G) of the main switch field-effect tube；One end of the resistance R8 connects the anode of the diode D4, described The other end of resistance R8 accesses between the resistance R7 and the grid of the main switch field-effect tube；The cathode of the diode D4 The source electrode of the main switch field-effect tube.

When the technical solution in above-mentioned each embodiment uses software realization, above-mentioned each embodiment can will be realized Computer instruction and/or data storage in computer-readable medium or as on readable medium one or more instructions or Code is transmitted.Computer-readable medium includes computer storage media and communication media, and wherein communication media includes being convenient for From a place to any medium of another place transmission computer program.Storage medium can be what computer can store Any usable medium.As example but not limited to this: computer-readable medium may include RAM, ROM, EEPROM, CD-ROM or Other optical disc storages, magnetic disk storage medium or other magnetic storage apparatus or can carry or store with instruction or data The desired program code of structure type simultaneously can be by any other medium of computer access.In addition, any connection can fit When become computer-readable medium.For example, if software is using coaxial cable, light pricker optical cable, twisted pair, Digital Subscriber Line (DSL) either the wireless technology of such as infrared ray, radio and microwave etc is transmitted from website, server or other remote sources , then the wireless technology packet of coaxial cable, optical fiber cable, twisted pair, DSL or such as infrared ray, wireless and microwave etc It includes in the definition of the medium.

Finally, it should be noted that above embodiments are only to illustrate the technical solution of the application, rather than its limitations.Although The application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that, still may be used To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features. And these are modified or replaceed, each embodiment technical solution of the application that it does not separate the essence of the corresponding technical solution spirit and Range.

Claims (7)

1. a kind of driving circuit of Switching Power Supply characterized by comprising processor (100), upper arm driving circuit (200) with And lower arm driving circuit (300)；The processor (100) sends pulse-width signal to the upper arm driving circuit respectively (200) and the lower arm driving circuit (300)；

The upper arm driving circuit (200) includes: electric potential transfer circuit (210), totem discharge circuit (220), half push-pull type Driving circuit (230) and fet gate discharge circuit (240)；The processor (100) sends pulse-width signal extremely The electric potential transfer circuit (210)；The electric potential transfer circuit (210) is electrically connected with the totem discharge circuit (220)；Institute Totem discharge circuit (220) is stated to be electrically connected with half push-pull driver circuit (230)；Half push-pull driver circuit (230) it is electrically connected with the fet gate discharge circuit (240)；

The electric potential transfer circuit (210) is used to amplify the voltage value of the pulse-width signal；The totem discharge circuit (220) for amplifying the current value of the pulse-width signal；Half push-pull driver circuit (230) is used on state Lower output positive voltage；The fet gate discharge circuit (240) is used to discharge to fet gate；

The lower arm driving circuit (300) is identical as upper arm driving circuit (200) construction.

2. the driving circuit of Switching Power Supply according to claim 1, which is characterized in that the electric potential transfer circuit (210) It include: comparator U1A, resistance R1, resistance R2, resistance R3 and capacitor C1；The pulsewidth modulation issued by the processor (100) Signal inputs the non-inverting input terminal of the comparator U1A；Power supply, the other end of the resistance R1 are accessed in one end of the resistance R1 Connect one end of the resistance R2；The other end of the resistance R2 is grounded；The capacitor C1 is connected in parallel on the both ends of the resistance R2； The inverting input terminal of the comparator U1A is connected between the resistance R1 and the resistance R2；The output end of the comparator U1A Access the totem discharge circuit (220)；One end of the resistance R3 connects the output end of the comparator U1A, the electricity The other end for hindering R3 connects the power input of the totem discharge circuit (220).

3. the driving circuit of Switching Power Supply according to claim 1, which is characterized in that the totem discharge circuit It (220) include: triode Q1, triode Q2, resistance R4 and resistance R5；The base stage of the triode Q1 connects the comparator The output end of U1A, the collector of the triode Q1 are connected to the power input of the totem discharge circuit (220), The emitter of the triode Q1 connects the collector of the triode Q2；The base stage of the triode Q2 connects the comparator The output end of U1A, the emitter ground connection of the triode Q2；The emitter of the triode Q1 is accessed in one end of the resistance R4 Between the collector of the triode Q2, the other end of the resistance R4 accesses half push-pull driver circuit (230)；Institute One end ground connection of resistance R5 is stated, the other end of the resistance R5 accesses half push-pull driver circuit (230).

4. the driving circuit of Switching Power Supply according to claim 3, which is characterized in that half push-pull driver circuit It (230) include: field-effect tube M1, transformer T1 and diode D1；The grid of the field-effect tube M1 connects the resistance R4 With the resistance R5, the drain electrode of the field-effect tube M1 connects 1 foot of the transformer T1, and the source electrode of the field-effect tube M1 connects Ground；2 feet of the transformer T1 are grounded, and 3 feet of the transformer T1 connect the cathode of the diode D1, the transformer T1 4 feet and 5 feet connect the fet gate discharge circuit (240)；The plus earth of the diode D1.

5. the driving circuit of Switching Power Supply according to claim 4, which is characterized in that the fet gate electric discharge electricity Road (240) include: diode D2, diode D3, diode D4, triode Q3, zener diode DV1, capacitor C2, resistance R6, Resistance R7 and resistance R8；The anode of the diode D2 accesses 4 feet of the transformer T1, and the cathode of the diode D2 connects Meet the capacitor C2；The cathode of the diode D3 accesses between 5 feet of the transformer T1 and the base stage of the triode Q3, The source electrode of the anode access main switch field-effect tube of the diode D3；The base stage of the triode Q3 accesses the transformer T1 5 feet, the collector of the triode Q3 accesses between the cathode of the diode D2 and the capacitor C2, the triode Q3 Emitter access main switch field-effect tube source electrode；The zener diode DV1 is connected in parallel on the both ends of the capacitor C2；It is described One end of resistance R6 is accessed between the cathode of the diode D2 and the capacitor C2, described in the other end connection of the resistance R6 The base stage of the cathode of diode D3,5 feet of the transformer T1 and the triode Q3；One end of the resistance R7 connects institute Capacitor C2 is stated, the other end of the resistance R7 accesses the grid of the main switch field-effect tube；One end of the resistance R8 connects The anode of the diode D4, the other end of the resistance R8 access the grid of the resistance R7 Yu the main switch field-effect tube Between；The source electrode of main switch field-effect tube described in the cathode of the diode D4.

6. a kind of half-bridge topology Switching Power Supply, which is characterized in that the driving circuit including Switching Power Supply, the drive of the Switching Power Supply Dynamic circuit includes: processor (100), upper arm driving circuit (200) and lower arm driving circuit (300)；The processor (100) Pulse-width signal is sent respectively to the upper arm driving circuit (200) and the lower arm driving circuit (300)；

The upper arm driving circuit (200) includes: electric potential transfer circuit (210), totem discharge circuit (220), half push-pull type Driving circuit (230) and fet gate discharge circuit (240)；The processor (100) sends pulse-width signal extremely The electric potential transfer circuit (210)；The electric potential transfer circuit (210) is electrically connected with the totem discharge circuit (220)；Institute Totem discharge circuit (220) is stated to be electrically connected with half push-pull driver circuit (230)；Half push-pull driver circuit (230) it is electrically connected with the fet gate discharge circuit (240)；

The electric potential transfer circuit (210) is used to amplify the voltage value of the pulse-width signal；The totem discharge circuit (220) for amplifying the current value of the pulse-width signal；Half push-pull driver circuit (230) is used on state Lower output positive voltage；The fet gate discharge circuit (240) is used to discharge to fet gate；

The lower arm driving circuit (300) is identical as upper arm driving circuit (200) construction.

7. a kind of electronic equipment, half-bridge topology Switching Power Supply, the half-bridge topology Switching Power Supply are provided on the electronic equipment Driving circuit including Switching Power Supply, which is characterized in that the driving circuit of the Switching Power Supply includes: processor (100), upper arm Driving circuit (200) and lower arm driving circuit (300)；The processor (100) sends pulse-width signal to described respectively Upper arm driving circuit (200) and the lower arm driving circuit (300)；

The upper arm driving circuit (200) includes: electric potential transfer circuit (210), totem discharge circuit (220), half push-pull type Driving circuit (230) and fet gate discharge circuit (240)；The processor (100) sends pulse-width signal extremely The electric potential transfer circuit (210)；The electric potential transfer circuit (210) is electrically connected with the totem discharge circuit (220)；Institute Totem discharge circuit (220) is stated to be electrically connected with half push-pull driver circuit (230)；Half push-pull driver circuit (230) it is electrically connected with the fet gate discharge circuit (240)；

The electric potential transfer circuit (210) is used to amplify the voltage value of the pulse-width signal；The totem discharge circuit (220) for amplifying the current value of the pulse-width signal；Half push-pull driver circuit (230) is used on state Lower output positive voltage；The fet gate discharge circuit (240) is used to discharge to fet gate；

The lower arm driving circuit (300) is identical as upper arm driving circuit (200) construction.