CN206806995U - A kind of drive circuit and electronic equipment - Google Patents
A kind of drive circuit and electronic equipment Download PDFInfo
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- CN206806995U CN206806995U CN201720557404.XU CN201720557404U CN206806995U CN 206806995 U CN206806995 U CN 206806995U CN 201720557404 U CN201720557404 U CN 201720557404U CN 206806995 U CN206806995 U CN 206806995U
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Abstract
It the utility model is related to technical field of circuit design, more particularly to a kind of drive circuit and electronic equipment.Wherein, the drive circuit includes：First switch circuit, protection circuit and clamp circuit；First switch circuit includes control terminal, input and output end, and protection circuit is connected between the output end of power supply and the input of first switch circuit, and the output end of first switch circuit and load connect, and the control terminal of first switch circuit is used to input control signal；Clamp circuit is connected between the output end of power supply and the control terminal of first switch circuit, when the electric current for flowing through load is more than scheduled current, will flow through the current limit of load in scheduled current.Therefore, the drive circuit can avoid load current excessive and produce harmful effect to power supply or load.
Description
Technical field
It the utility model is related to technical field of circuit design, more particularly to a kind of drive circuit and electronic equipment.
Background technology
In various electronic products, fan, motor etc. are a kind of common inductive loads.Speed governing is carried out to such load
When, the running speed of such load can be adjusted by changing all kinds of parameters of drive circuit.
The above-mentioned moment for being supported on startup or stall, now load current is often excessively more than the work needed for normal operation
Make electric current.When the load current exceedes power source loads ability, it can cause system reset or other abnormal problems.
Utility model content
One purpose of the utility model embodiment aims to provide a kind of drive circuit and electronic equipment, to solve existing skill
Art has load causes the excessive technical problem of the electric current for flowing through load under abnormal operation.
In order to solve the above technical problems, the utility model embodiment provides following technical scheme：
In a first aspect, the utility model embodiment discloses a kind of drive circuit, the drive circuit includes first switch
Circuit, protection circuit and clamp circuit；The first switch circuit includes control terminal, input and output end, the protection
The output end of circuit and power supply is connected, and the input also with the first switch circuit is connected, the first switch circuit
Output end connected with load, the control terminal of the first switch circuit is used to input control signal, in the control signal control
When making the first switch circuit turn-on, the power supply is by the protection circuit to the load supplying；The clamp circuit
It is connected with the output end of the power supply, and the control terminal also with the first switch circuit is connected, and is flowing through the load
When electric current is more than scheduled current, the current limit of the load will be flowed through in the scheduled current.
Alternatively, the clamp circuit includes the first diode and the second diode；The positive pole of first diode connects
The output end of the power supply is connected to, the negative pole of first diode is connected with the positive pole of second diode, and described second
The negative pole of diode is connected to the control terminal of the first switch circuit.
Alternatively, the clamp circuit includes a voltage-regulator diode, and the negative pole of the voltage-regulator diode is connected to the electricity
The output end in source, the positive pole of the voltage-regulator diode are connected to the control terminal of the first switch circuit.
Alternatively, the protection circuit includes a first resistor, and one end of the first resistor is connected to the power supply
Output end, the other end are connected to the input of the first switch circuit.
Alternatively, the first resistor is semistor.
Alternatively, the semistor is set adjacent to the first switch circuit.
Alternatively, the drive circuit also includes second switch circuit, and the second switch circuit includes control terminal, first
End and the second end, the control terminal of the first switch circuit receive the control signal by the second switch circuit；Wherein,
The control terminal of the second switch circuit is used to input the control signal, described in the first end connection of the second switch circuit
The control terminal of first switch circuit, the second end ground connection of the second switch circuit.
Alternatively, the first switch circuit is PNP type triode, and the base stage of the PNP type triode is described first
The control terminal of on-off circuit, the input of the extremely described first switch circuit of transmitting of the PNP type triode, the positive-negative-positive
The output end of the extremely described first switch circuit of the current collection of triode；The second switch circuit is NPN type triode, described
The base stage of NPN type triode be the second switch circuit control terminal, the current collection extremely described second of the NPN type triode
The first end of on-off circuit, the second end of the extremely described second switch circuit of transmitting of the NPN type triode.
Alternatively, the drive circuit also includes a second resistance and a 3rd resistor, the base stage of the NPN type triode
The control signal is received by the 3rd resistor；Wherein, the second resistance is serially connected in the base stage of the PNP type triode
Between the colelctor electrode of the NPN type triode, one end of the 3rd resistor is used to inputting the control signal, and the described 3rd
The other end of resistance is connected to the control terminal of the NPN type triode.
Alternatively, the drive circuit also includes filter circuit, and the filter circuit is connected to the first switch circuit
Output end and ground between.
Alternatively, the filter circuit includes one first electric capacity and an electrochemical capacitor；One end of first electric capacity and institute
The positive pole for stating electrochemical capacitor is connected to the output end of the first switch circuit, the other end and the electricity of first electric capacity
The negative pole of solution electric capacity is grounded.
Alternatively, the control signal is PWM delivery outlet signal.
In second aspect, the utility model embodiment provides a kind of electronic equipment, and the electronic equipment includes above-mentioned drive
Dynamic circuit.
In various embodiments, when some factors cause the electric current for flowing through load to change, and the electricity of load is flowed through
Stream is when being more than scheduled current, and drive circuit can will flow through the current limit of load to scheduled current by clamp circuit, so that
Avoid load current excessive and harmful effect is produced to power supply or load.
Brief description of the drawings
One or more embodiments are illustrative by the picture in corresponding accompanying drawing, these exemplary theorys
The bright restriction not formed to embodiment, the element for having same reference numbers label in accompanying drawing are expressed as similar element, removed
Non- have a special statement, and composition does not limit the figure in accompanying drawing.
Fig. 1 is that the utility model embodiment provides a kind of theory diagram of drive circuit；
Fig. 2 is that the utility model embodiment provides a kind of structural representation of drive circuit；
Fig. 3 is that the another embodiment of the utility model provides a kind of theory diagram of drive circuit；
Fig. 4 is that the utility model another embodiment provides a kind of theory diagram of drive circuit；
Fig. 5 is that the another embodiment of the utility model provides a kind of structural representation of drive circuit.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, below in conjunction with accompanying drawing and implementation
Example, the utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining this
Utility model, it is not used to limit the utility model.
Fig. 1 is that the utility model embodiment provides a kind of theory diagram of drive circuit.As shown in figure 1, the drive circuit
10 and power supply 20 connect, worked for driving load 30, wherein load 30 for example can be motor.The drive circuit 10 includes the
One on-off circuit 101, protection circuit 102 and clamp circuit 103.
Wherein, first switch circuit 101 includes control terminal 101A, input 101B and output end 101C, protection circuit 102
Be connected between the output end 20A of power supply 20 and the input 101B of first switch circuit 101, first switch circuit 101 it is defeated
Go out to hold 101C and the connection of load 30, the control terminal 101A of first switch circuit 101 is used to input control signal 40.Work as control signal
When 40 control first switch circuits 101 turn on, power supply 20 is by protection circuit 102 to the power supply of load 30.
Clamp circuit 103 is connected between the output end 20A of power supply 20 and the control terminal 101A of first switch circuit 101,
When the electric current for flowing through load 30 is more than scheduled current, the current limit for loading 30 will be flowed through in scheduled current.In power supply 20
Under the normal operating conditions for providing electric current for load 30 by drive circuit 10, normal current is less than scheduled current.Wherein,
The load current that the scheduled current is under normal operating conditions with load 30 associates, for evaluating the work shape of present load 30
State, when the electric current for flowing through load 30 is more than scheduled current, the load 30 is said to operate in abnormality, if load 30 continues
Abnormality is operated in, then the electric current for flowing through load causes serious threat to the performance of load and the stabilization of system.Then, pass through
To the setting scheduled current of load 30, it can protect the stability of load and maintenance system well.30 are loaded when flowing through
When electric current is less than scheduled current, the load 30 can be evaluated as being operated in normal condition.
In the present embodiment, the electric current for causing to flow through load 30 when some factors changes, and flows through load 30
When electric current is more than scheduled current, drive circuit 10 can by clamp circuit 103 will flow through load 30 current limit to make a reservation for
Electric current, harmful effect is produced to power supply 20 or load 30 so as to avoid load current excessive.
First switch circuit 101 can according to the control signal for the control terminal 101A for loading on first switch circuit 101, with
Realize the on or off to input voltage or electric current.In certain embodiments, on-off circuit can be electronic switching tube, such as
It is bipolar transistor (bipolar junction transistor, BJT), field-effect transistor (Field Effect
Transistor, FET), IGCT and etc..In certain embodiments, on-off circuit can be made up of each discrete component
With the circuit unit that is controlled of control signal by outside, the concrete composition of the circuit unit is by designer according to business need
The work characteristics of summation integrated circuit is designed.
Also referring to Fig. 1 and Fig. 2, in certain embodiments, clamp circuit 103 includes the first diode D1 and the two or two
Pole pipe D2, protection circuit 102 include first resistor R1, and first switch circuit 101 is PNP type triode Q1.The wherein pole of positive-negative-positive three
Pipe Q1 base stage be first switch circuit 101 control terminal 101A, PNP type triode Q1 transmitting extremely first switch circuit
The output end 101C of 101 input 101B, PNP type triode Q1 current collection extremely first switch circuit 101.First diode
D1 positive pole is connected to the output end 20A of power supply 20, the second diode D2 positive pole and the first diode D1 negative pole connection, the
Two diode D2 negative pole connects with PNP type triode Q1 base stage.First resistor R1 one end is connected to the output of power supply 20
20A is held, the other end is connected to triode Q1 emitter stage.
Further, a second switch circuit 104, one second is also included also referring to Fig. 2 and Fig. 3, drive circuit 10
Resistance R2, a 3rd resistor R3 and a filter circuit 105.Wherein, load 30 is represented with resistance RL.Second switch circuit 104
Including control terminal 104A, first end 104B and the second end 104C, the control terminal 101A of first switch circuit 101 passes through second switch
Circuit 104 receives control signal 40；Wherein, the control terminal 104A of second switch circuit 104 is used to input control signal 40, and second
The control terminal 101A of the first end 104B connection first switches circuit 101 of on-off circuit 104, the second of second switch circuit 104
Hold 104C ground connection.
Second switch circuit 104 is NPN type triode Q2.As shown in Fig. 2 triode Q2 base stage is as second switch electricity
The control terminal on road 104, and be connected with 3rd resistor R3 one end, the 3rd resistor R3 other end is used to input control signal
40.First end of the triode Q2 colelctor electrode as second switch circuit 104, is connected with second resistance R2 one end, the second electricity
The resistance R2 other end is connected with triode Q1 base stage；Second end of the triode Q2 emitter stage as second switch circuit 104
104C, triode Q2 emitter stage are connected to the ground.In certain embodiments, control signal 40 is PWM delivery outlet signal.
As shown in Fig. 2 filter circuit 105 includes an one first electric capacity C1 and electrochemical capacitor C2.First electric capacity C1 one end
The output end 101C of first switch circuit 101, the first electric capacity C1 other end and electricity are connected to electrochemical capacitor C2 positive pole
Solution electric capacity C2 negative pole is grounded.
By the drive circuit 10 of the present embodiment, its can not only limit flow through the electric current of load 30 in scheduled current it
Under, and the adjustment for the output voltage for loading on load 30 can also be realized.The operation principle of the drive circuit 10 is as follows：
When control signal 40 is low level, NPN type triode Q2 disconnects with PNP type triode Q1, voltage output end
10A Non voltage outputs.
When control signal 40 is high level, NPN type triode Q2 conductings, wherein, the first diode D1, the second diode
D2, second resistance R2 and NPN type triode Q2 form the first bias loop, first resistor R1, PNP type triode Q1, the second electricity
Hinder R2 and NPN type triode Q2 and form the second bias loop, the first bias loop and the second bias loop collectively form positive-negative-positive three
Pole pipe Q1 bias loop, PNP type triode Q1 working condition is configured so as to realize.As load current IL ≈ IO ≈
When Ie is smaller, and R1*Ie+VCE<PNP type triode Q1 working condition can be arranged at and lead by 2VD1, the first bias loop
Logical state.When load current IL ≈ IO ≈ Ie electric currents are larger, and meet condition R1*Ie+Veb>During 2VD1, two bias loops
Concur, the first diode D1 and the second diode D2 forward voltage drop form clamper, I0 ≈ Ie=to R1-Veb
(2VD1-Veb)/R1 Veb ≈ 0.7V, in this case, causes electric current mistake because VD1 is definite value when exception occurs in load 30
When big, the voltage at R1 and Veb both ends is limited in constant 2VD1 by clamp circuit, and then load current is limited by constant current,
Therefore power supply 20 or load 30 are protected.In certain embodiments, load current can be limited to scheduled current Imax, passed through
The appropriate value for choosing R1, determines scheduled current Imax.Clamper herein is referred to by the first diode D1 and the second diode
D2 effect, it can be by the potential clamper where PNP type triode Q1 base stage in changeless preset potential.
In some application processes, according to consumption electric current during 30 normal work of load suitable circuit can be selected to join
Number, and appropriate constant current output is set, it can fully improve the utilization rate of power supply and reduce the design requirement of power supply.Such as：
The normal running conditions of one load motor is 12V DC voltage, 150mA direct currents, when the motor lock-rotor or startup moment, is born
Carry electric current most conference and reach 8 times of operating current, i.e. 150mA*8=1.2A, therefore, and when designing motor power, motor power palpus
12V*1.2A=14.4W design capacity is provided.But the drive circuit provided using the present embodiment, constant current is selected in 2 times
Operating current, as 300mA when, electric current during motor normal work is 150mA, start or maximum current during stall but by
300mA is limited in, the design of motor power only needs 12*0.3=3.6W, therefore greatly reduces the requirement to motor power, from
And reduce product cost.
In certain embodiments, when load is chronically at abnormal operation, load each functional unit uses the longevity
Life can be by extreme influence.For example, when motor is chronically at short-circuit condition and makes the electric current for flowing through motor excessive, motor can produce
Excessive heat, the heat increases the operating temperature of motor, and then influences the operating efficiency and service life of motor.Hereby, in order to
Load in abnormality is isolated from drive circuit, to protect load, the first resistor R1 that the present embodiment provides is
Semistor (Positive Temperature Coefficient, PTC).First resistor R1 action current
Less than predetermined current Imax, predetermined current Imax can be according to the rated current of load to set, for example, the volume of 15KW motor
It is 28.6A to determine electric current, and predetermined current Imax can be 28.6A, can also be 29.5A.
When flowing through first resistor R1 electric current and being enough to make the temperature rise of first resistor R1 self-heatings exceed Curie temperature, the electric current is referred to as
First resistor R1 action current I1, wherein, first resistor R1 resistance corresponding to action current I1 is RK.In some embodiments
In, it is contemplated that first resistor R1 material character and make the specified action currents of first resistor R1 and actual act electric current not right
The current error of each discrete component in current error caused by title, first resistor R1 local environment factors and drive circuit
(for example, PNP type triode Q1 material character cause essence flow through first resistor R1 electric current it is less than normal), in order to it is relatively reliable,
The current limit of load will safely be flowed through within predetermined current Imax, selected first resistor R1 action current I1 should
Less than (2VD1-Veb)/RK.
When PNP type triode Q1 is in the conduction state, and cause for some reason load short circuits or other it is abnormal and
When causing output current IO increase, PNP type triode Q1 enters magnifying state, and Vec rises, and Vec is PNP type triode Q1 hair
Pressure difference between emitter-base bandgap grading and colelctor electrode.When the load current for flowing through load 30 reaches scheduled current Imax=(2VD1-Veb)/R1
When, drive circuit 10 is in constant current state.When loading 30 persistent anomaly, because first resistor R1 action current is less than
(2VD1-Veb)/R1, according to Joule's law Q=Ie^2*R1*T, because Ie now is equal to Imax, over time T increase,
First resistor R1 heat is bigger (temperature rise), enters high-impedance state, first resistor R1 so as to trigger first resistor R1 (PTC)
Resistance increase with the rise of temperature, increased from formula Ie=(2VD1-Veb)/R1, R1, I e reduce, therefore, stream
The load current of overload 30 reduces simultaneously, realizes the automatism isolation of load 30 in abnormality, therefore, flows through load 30
Electric current can recover to normal current, so as to will before in abnormal current state load switching normal current conditions,
Complete the isolation of abnormal load.For example, 15KW Rated motors electric current is 28.6A, predetermined current Imax is 29.5A, first resistor
R1 action current I1 is 29A.Due to electric motor short circuit, the load current for flowing through motor is set to reach 29.3A, now, first resistor
R1 action current I1 is triggered, and first resistor R1 resistance starts to increase with the increase of temperature, so as to flow through motor
Load current be reduced under 29.3A.
In certain embodiments,, can be with assembling process to realize that first resistor R1 can quickly enter high-impedance state
Neighbouring first switch circuit 101 sets first resistor R1, you can so that first resistor R1 is pressed close into PNP type triode Q1, due to PNP
When type triode Q1 is in Current amplifier state, its caloric value is more, and a part of heat can be conducted to first resistor R1, make first
Resistance R1 is brought rapidly up entering high-impedance state, so as to improve first resistor R1 respond rapidly to abnormal load situation and will be abnormal negative
It is loaded into capable isolation.
By using the constant-current characteristics and positive temperature coefficient thermistor of drive circuit, when load 30 is continuously in exception
During state, it can be realized automatically isolates to load 30, prevents that loading 30 long-times is in over-current state and is damaged.
Referring again to Fig. 2.Drive circuit 10 to load 30 except that can carry out constant current protection and automatism isolation in abnormal
The load of state, alternatively, it can also adjust the both end voltage of load 30.Specifically, the regulation of drive circuit 10 load 30
The operation principle of both end voltage is as follows：
When drive circuit 10 is charged using constant current to electrochemical capacitor C2, according to formula：Wherein, Q is Q=C Δs U=IT
Electrochemical capacitor C2 storing electricity, C are electrochemical capacitor C2 capacitance, and T is the discharge and recharge time, and Δ U is electrochemical capacitor C2 both ends
Voltage difference.In the case where capacitance C is fixed value, by controlling the discharge and recharge time to be exported to first switch circuit 101
Voltage carry out pressure regulation.Specifically, when control signal 40 is high level, wherein, the duration of the high level is T1, this
When, the voltage against load 30 that first switch circuit 101 exports is powered, and at the same time, also electrochemical capacitor C2 is charged.
When control signal 40 is low level, wherein, the low level duration is T2, and now, electrochemical capacitor C2 passes through load 30
Discharged.
The charging current Ich=I0-IL of electric capacity, charging interval T1, discharge time T2；
T1+T2=1/F, F are control signal PWM cycle.In order to keep stable output voltage, charging charge need to be equal to
Discharge charge, according to formula, obtain：
△ U*C=Ich*T1=IL*T2, wherein IL=VO/RL, V0 are load both end voltage, and RL is the equivalent electric of load
Resistance.
According to above-mentioned formula, can derive：
T1/ (T1+T2)=IL/ (Ich+IL)
Ich+IL=(VD1+VD2-Vbe)/R1, VD1 is PNP type triode Q1 conduction voltage drop, and VD2 is the pole of NPN type three
Pipe Q2 conduction voltage drop.
Due to the pulse duty factor that T1/ (T1+T2) is control signal, T1+T2 is the pulse period of control signal, and 1/
(T1+T2) it is pulse frequency, therefore, can be to control output voltage, so as to realize by controlling the pulse frequency of control signal
The adjustment of output voltage.
In the soft start of Motor load, drive circuit 10 controls output voltage according to control logic, drive circuit 10
Predeterminated voltage is smoothly raised slowly to from 0V by certain gradient, makes the smooth starting of motor, so as to reduce high current to motor
Impact and noise reduction, and improve motor and equipment machine life.In the speed governing of Motor load, the high electricity of drive circuit output
During pressure, flow through that the electric current of motor is big, the rotating speed of motor is fast；When exporting low-voltage, flow through that the electric current of motor is small, the rotating speed of motor
Slowly, so as to realizing to the comprehensive speed governing of motor.
During the power consumption control loaded to relay class, when backend load is relay coil, make using pressure regulation
The effect for reducing power consumption with realizing.For example, for 12V relay, normal voltage during startup is 12V, in relay adhesive
Afterwards, drive circuit 10 drops to output voltage holding voltage 3V of relay or so, so as to flow through the electric current of relay coil
Original 1/4, lower power consumption to original 1/16 will be reduced to.
As shown in figure 4, in certain embodiments, the drive circuit 10 also includes sample circuit 106 and control circuit 107,
The input 106A of sample circuit 106 connects with the output end 101C of first switch circuit 101, the output end of sample circuit 106
106B and control circuit 107 connect.When load 30 is short-circuit or works in abnormality and cause the defeated of first switch circuit 101
When going out electric voltage exception, sample circuit 106 gathers the output voltage of first switch circuit 101, exports collection signal to control circuit
107, control circuit 107 carries out analog-to-digital conversion and analysis to the collection signal, using corresponding control strategy, passes through adjustment control
The pulse duty factor of signal enables the stabilization of the reliable operation of load 30 and maintenance system to adjust the voltage of load 30.Design
Person can select suitable element to be designed sample circuit 106 according to the work characteristics and performance requirement of drive circuit.Example
Such as, a collection resistance can be drawn in the output of first switch circuit 101, collection resistance can be by first switch circuit 101
Output voltage feeds back to control circuit 107, so as to realize the collection of the output voltage of on-off circuit 101.
In certain embodiments, control circuit 107 can be processor.Wherein, the processor can also be general procedure
Device, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA) or other programmable
Any combinations of logical device, discrete gate or transistor logic, discrete nextport hardware component NextPort or these parts.Further, herein
Processor can be any conventional processors, controller, microcontroller or state machine.Processor can also be implemented as calculating and set
Standby combination, for example, the combination of DSP and microprocessor, multi-microprocessor, one or more microprocessors combination DSP core or
Any other this configuration.
Referring to Fig. 5, the difference of the drive circuit and the drive circuit shown in above-mentioned each embodiment shown in Fig. 5 exists
In the clamp circuit 103 can include voltage-regulator diode ZD1, specifically, voltage-regulator diode ZD1 negative pole is connected to power supply 20
Output end 20A, positive pole is connected to the control terminal of first switch circuit 101, that is, is connected to PNP type triode Q1 base stage.When
When PNP type triode Q1 is in the conduction state, because voltage-regulator diode ZD1 is in reverse-bias state, therefore, voltage-regulator diode
ZD1 can form clamper to (R1-Veb).Those skilled in the art should be understood that to form clamper, clamper to (R1-Veb)
Circuit 103 can use the circuit design in addition to above-mentioned two kinds of introduced circuit structure modes, it is thought that designer
The content instructed and guided according to the utility model, equivalence replacement or modification are carried out to the clamp circuit shown in embodiment, should
Fall within the scope of protection of the utility model.
As the another aspect of the utility model embodiment, the utility model embodiment provides a kind of electronic equipment.Such as Fig. 1
Be used for the drive circuit shown in Fig. 5 in the electronic equipment, wherein, the electronic equipment can be motor, relay and etc..
When some factors cause the electric current for flowing through load to change, and the electric current for flowing through load is more than scheduled current
When, electronic equipment can be set by the current limit for flowing through load to scheduled current so as to avoid load current excessive to electronics
It is standby to produce harmful effect.
Embodiment of the present utility model is the foregoing is only, not thereby limits the scope of the claims of the present utility model, it is all
It is the equivalent structure or equivalent flow conversion made using the utility model specification and accompanying drawing content, or directly or indirectly uses
In other related technical areas, similarly it is included in scope of patent protection of the present utility model.
Claims (13)
1. a kind of drive circuit, it is characterised in that including first switch circuit, protection circuit and clamp circuit；
The first switch circuit includes control terminal, input and output end, and the output end of the protection circuit and power supply connects,
And the input also with the first switch circuit is connected, output end and the load of the first switch circuit connect, described
The control terminal of first switch circuit is used to input control signal, and the first switch circuit turn-on is controlled in the control signal
When, the power supply is by the protection circuit to the load supplying；
The clamp circuit is connected with the output end of the power supply, and the control terminal also with the first switch circuit is connected,
During for being more than scheduled current in the electric current for flowing through the load, the current limit of the load will be flowed through to the scheduled current
It is interior.
2. drive circuit according to claim 1, it is characterised in that the clamp circuit includes the first diode and second
Diode；
The positive pole of first diode is connected to the output end of the power supply, the negative pole of first diode and described second
The positive pole connection of diode, the negative pole of second diode are connected to the control terminal of the first switch circuit.
3. drive circuit according to claim 1, it is characterised in that the clamp circuit includes a voltage-regulator diode, institute
The negative pole for stating voltage-regulator diode is connected to the output end of the power supply, and the positive pole of the voltage-regulator diode is connected to described first and opened
The control terminal on powered-down road.
4. the drive circuit according to Claims 2 or 3, it is characterised in that the protection circuit includes a first resistor, institute
The one end for stating first resistor is connected to the output end of the power supply, and the other end is connected to the input of the first switch circuit.
5. drive circuit according to claim 4, it is characterised in that the first resistor is positive temperature coefficient temperature-sensitive electricity
Resistance.
6. drive circuit according to claim 5, it is characterised in that the semistor is adjacent to described
One on-off circuit is set.
7. drive circuit according to claim 1, it is characterised in that the drive circuit also includes second switch circuit,
The second switch circuit includes control terminal, first end and the second end, and the control terminal of the first switch circuit passes through described
Two on-off circuits receive the control signal；
Wherein, the control terminal of the second switch circuit is used to input the control signal, and the first of the second switch circuit
End connects the control terminal of the first switch circuit, the second end ground connection of the second switch circuit.
8. drive circuit according to claim 7, it is characterised in that
The first switch circuit is PNP type triode, and the base stage of the PNP type triode is the control of the first switch circuit
End processed, the input of the extremely described first switch circuit of transmitting of the PNP type triode, the current collection of the PNP type triode
The output end of extremely described first switch circuit；
The second switch circuit is NPN type triode, and the base stage of the NPN type triode is the control of the second switch circuit
End processed, the first end of the extremely described second switch circuit of current collection of the NPN type triode, the transmitting of the NPN type triode
Second end of extremely described second switch circuit.
9. drive circuit according to claim 8, it is characterised in that
The drive circuit also includes a second resistance and a 3rd resistor, and the base stage of the NPN type triode passes through described
Three resistance receive the control signal；
Wherein, the second resistance be serially connected in the PNP type triode base stage and the NPN type triode colelctor electrode it
Between, one end of the 3rd resistor is used to input the control signal, and the other end of the 3rd resistor is connected to the NPN type
The control terminal of triode.
10. drive circuit according to claim 1, it is characterised in that the drive circuit also includes filter circuit, described
Filter circuit is connected between output end and the ground of the first switch circuit.
11. drive circuit according to claim 10, it is characterised in that the filter circuit includes one first electric capacity and one
Electrochemical capacitor；
One end of first electric capacity and the positive pole of the electrochemical capacitor are connected to the output end of the first switch circuit, institute
The negative pole of the other end and the electrochemical capacitor of stating the first electric capacity is grounded.
12. according to the drive circuit described in claim any one of 7-11, it is characterised in that the control signal is pwm pulse
Modulated signal.
13. a kind of electronic equipment, it is characterised in that including the drive circuit as described in claim 1 to 12 is any.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720557404.XU CN206806995U (en) | 2017-05-17 | 2017-05-17 | A kind of drive circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720557404.XU CN206806995U (en) | 2017-05-17 | 2017-05-17 | A kind of drive circuit and electronic equipment |
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| Publication Number | Publication Date |
|---|---|
| CN206806995U true CN206806995U (en) | 2017-12-26 |
Family
ID=60741302
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720557404.XU Active CN206806995U (en) | 2017-05-17 | 2017-05-17 | A kind of drive circuit and electronic equipment |
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| CN (1) | CN206806995U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108323218A (en) * | 2017-05-17 | 2018-07-24 | 深圳和而泰智能控制股份有限公司 | A kind of driving circuit and electronic equipment |
| CN109038523A (en) * | 2018-07-06 | 2018-12-18 | 广东奥普特科技股份有限公司 | A kind of circuit for inhibiting to power on surge current |
-
2017
- 2017-05-17 CN CN201720557404.XU patent/CN206806995U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108323218A (en) * | 2017-05-17 | 2018-07-24 | 深圳和而泰智能控制股份有限公司 | A kind of driving circuit and electronic equipment |
| CN109038523A (en) * | 2018-07-06 | 2018-12-18 | 广东奥普特科技股份有限公司 | A kind of circuit for inhibiting to power on surge current |
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