CN201639533U - Power driver - Google Patents
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- CN201639533U CN201639533U CN2009202192693U CN200920219269U CN201639533U CN 201639533 U CN201639533 U CN 201639533U CN 2009202192693 U CN2009202192693 U CN 2009202192693U CN 200920219269 U CN200920219269 U CN 200920219269U CN 201639533 U CN201639533 U CN 201639533U
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Abstract
A power driver is used for driving a high-power load according to a control signal, and a high-level control circuit of the power driver comprises a charge pool, a signal input end, a DC power supply end, a control end and a comparison end, wherein the DC power supply end is connected with a potential which has certain potential difference relative to a ground potential. When the signal input end receives the control signal of 'off', the charge pool is charged by the DC power supply end, and the charge is stored, and a potential difference less than certain trigger voltage is kept between the control end and the comparison end at the moment. When the signal input end receives the control signal of 'on', the charge pool is discharged by circuits which are respectively connected with the control end and the comparison end, so that the potential difference between the control end and the comparison end is more than the trigger voltage.
Description
[technical field]
The utility model relates to analog line driver, relates in particular to the analog line driver by the high-power inductive load of electric-controlled switch control.
[background technology]
For a long time, direct current machine becomes the optimal selection of most of variable motion controls and closed loop Positioning Servo System with its favorable linearity characteristic, excellent characteristics such as control performance.Along with the second generation The development of power semiconductor device of high switching frequency, full-control type, computer is in the development in control field, and pulse-width modulation (PWM) DC speed regulation The Application of Technology especially, and direct current machine is used widely.
For adapting to the user demand of dc micro-motor, each semiconductor manufacturer has released DC MOTOR CONTROL application-specific integrated circuit (integrated circuit), constitutes the direct current machine servo system based on microprocessor control.But the power output of the DC motor driver that application-specific integrated circuit (ASIC) constitutes is limited, is not suitable for high power DC electric machine and drives demand.
In the electron trade product, a large amount of use MOSFET (mos field effect transistor) are used to drive powerful load, particularly inductive load (such as motor) as electric-controlled switch.Therefore adopt the enhancement mode field effect transistor, can be directly and Microprocessor Interface, use the PWM technology and realize DC motor speed-regulating control, satisfy high power DC electric machine drive controlling demand, and have fast, accurately, efficiently, characteristics such as low-power consumption.
But if will control each MOSFET, the source electrode of each MOSFET and the voltage between the grid must be enough high.Usually MOSFET is because the requirement of drive characteristic, when the potential change of source electrode, grid potential needs the variation of corresponding height, just can keep enough high voltages between source electrode and the grid with driven MOS FET, so nearly all need very complicated drive circuit and complicated power supply circuits, during especially for driven MOS FET matrix and many current potentials MOSFET matrix, complicated drive circuit and supporting multichannel insulating power supply then are problems of having a bad headache.
For the problems referred to above, each big IC manufacturer has all developed special-purpose chip for driving and module, but, price is high, and all be the design of carrying out at certain specific environment and demand, so, directly certainly will cause the design that all is limited to chip manufacturer under the high and a lot of situations of cost with special-purpose chip for driving and module.Simultaneously, because kind is numerous and application surface is very narrow, so also Fu Dai a series of problems such as generation buying.
Therefore, press for low cost and addressing the above problem reliably.
[utility model content]
The technical problems to be solved in the utility model is, a kind of analog line driver cheaply is provided, even the current potential of controlled electric-controlled switch changes with respect to earth potential, analog line driver still can be controlled the certain control voltage of output to drive electric-controlled switch.
For solving the problems of the technologies described above, analog line driver of the present utility model adopts following technical scheme:
The utility model provides a kind of analog line driver with high-order control circuit, be used for driving high power load according to control signal, this high position control circuit comprises electric charge pond, signal input part, dc power supply terminal, control end and relatively holds that dc power supply terminal is connected to the current potential that has certain electrical potential difference with respect to earth potential.When signal input part receives " breaking " control signal, charged and store charge by dc power supply terminal in the electric charge pond, but this moment control end with relatively between the end maintenance less than the electrical potential difference of certain trigger voltage.When signal input part received " leading to " control signal, the electric charge pond was by connecting the control end and the circuit discharging of end relatively respectively, and electrical potential difference is greater than described trigger voltage between making control end and relatively holding.
Analog line driver of the present utility model utilizes the rule of drives signal itself, the electric charge pond is filled, discharge, because electric charge pond both end voltage can not be suddenlyd change, control end can be superposeed on the basic current potential of relatively holding, make under the situation of comparison terminal potential rising certain amplitude, the current potential of the control end corresponding amplitude that also can raise, thereby the retentive control end and relatively the end between electrical potential difference greater than described trigger voltage, realized that control end is with respect to the relatively lifting of terminal voltage, and then realized under dc power supply terminal low-voltage condition, height being driven the driving of voltage-controlled type electronic devices and components.
In a kind of preferred embodiment, analog line driver of the present utility model also comprises the low level control circuit, comprise signal input part, dc power supply terminal and control end, dc power supply terminal is connected to the current potential that has the predetermined potential difference with respect to earth potential, in this low level control circuit: when signal input part received " breaking " control signal, the electrical potential difference between control end and the ground was less than aforementioned trigger voltage; When signal input part received " leading to " control signal, the electrical potential difference between control end and the ground was greater than aforementioned trigger voltage.
The low level control circuit can be done fairly simplely and cost is lower like this, when high and low position control circuit is used to drive the matrix of a plurality of voltage-controlled type electronic devices and components, the low level control circuit can be used to drive the current potential voltage-controlled type electronic devices and components fixing with respect to earth potential, and only be useful on when driving current potential with respect to the unsteady voltage-controlled type electronic devices and components of earth potential, just use high-order control circuit.Because the relative low level control circuit of high-order control circuit is more complicated and cost is higher, like this when the quantity of the high-order control circuit of minimizing, thereby reduced whole cost.
In a preferred embodiment, when the control signal that the signal input part of high-order control circuit receives changed, it is terminal potential existence variation relatively.In embodiment of the present utility model, no matter relatively how terminal potential changes, high-order control circuit still can be at control end and is relatively exported certain driving voltage between the end, and the advantage of high-order control circuit is demonstrated fully.
In another preferred embodiment, between dc power supply terminal and electric charge pond, be connected with asymmetrical circuit element, when the signal input part of high-order control circuit receives " leading to " control signal, asymmetrical circuit element ends, when the signal input part of high-order control circuit receives " breaking " control signal, the asymmetrical circuit element conducting.Asymmetrical circuit element can adopt crystal diode commonly used, its technology maturation, and simple in structure and stable performance, cost is also low, can realize the charge and discharge control to the electric charge pond under prerequisite cheaply.
In another preferred embodiment, in high-order control circuit, control end and relatively the end between be connected with control element, when signal input part receives " breaking " control signal, this control element makes control end and relatively is in conducting state between the end, when signal input part received " leading to " control signal, this control element made control end and relatively is in cut-off state between the end.This control element can improve control end in the high-order control circuit and the stability of the control of the driving voltage of output between relatively holding.
In another preferred embodiment, in the low level control circuit, be connected with control element between control end and the ground, when signal input part receives " breaking " control signal, this control element makes between control end and the ground and is in conducting state, when signal input part received " leading to " control signal, this control element made between control end and the ground and is in cut-off state.This control element can improve the stability to the control of control end current potential in the low level control circuit.
In another preferred embodiment, in high-order control circuit, be connected with control element between extremely relative another utmost point that is connected with end relatively in electric charge pond and the control end, when signal input part receives " leading to " control signal, this control element makes between control end and the electric charge pond and is in conducting state, when signal input part received " breaking " control signal, this control element made between control end and the electric charge pond and is in cut-off state.This control element can be realized with transistor commonly used, its technology maturation, and simple in structure and stable performance, cost is also low, can realize the charge and discharge control to the electric charge pond under prerequisite cheaply.
In another preferred embodiment, in the low level control circuit, be connected with control element between control end and the dc power supply terminal, when signal input part receives " leading to " control signal, this control element makes between control end and the dc power supply terminal and is in conducting state, when signal input part received " breaking " control signal, this control element made between control end and the dc power supply terminal and is in cut-off state.This control circuit to the power on/off of dc power supply terminal is simple, and this control element can realize with transistor commonly used, its technology maturation, and simple in structure and stable performance, cost is also low, can realize the control of control end current potential under prerequisite cheaply.
In another preferred exemplary embodiments, it comprises two high-order control circuits and two low level control circuits, each control circuit is controlled at least one electric-controlled switch, each electric-controlled switch comprises grid, source electrode and drain electrode, when the voltage between grid and source electrode reaches aforesaid trigger voltage, source electrode and drain electrode conducting, otherwise source electrode and drain electrode end; In the electric-controlled switch of high-order control circuit control, drain electrode all is electrically connected to a utmost point of DC driven power supply, source electrode is connected respectively to the relative first load utmost point and the second load utmost point of relatively holding and be connected respectively to load of corresponding high-order control circuit, and grid then is connected respectively to the control end of corresponding high-order control circuit; In the electric-controlled switch of two low level control circuit controls, drain electrode is connected respectively to relative the two poles of the earth of described load, and source electrode all is connected to ground, and grid then is connected respectively to the control end of corresponding low level control circuit.Like this, source electrode is connected to earthy electric-controlled switch and drives with the low level control circuit, and other electric-controlled switchs just use high-order control circuit, and reasonably combination has reduced whole cost.
In another preferred embodiment, during with the extremely direct-connected electric-controlled switch conducting that is subjected to the control of high-order control circuit of described first load, with the extremely direct-connected also conducting of electric-controlled switch that is subjected to the control of low level control circuit of described second load, other two electric-controlled switchs then end; When ending, also end other two then conductings of electric-controlled switch with the extremely direct-connected electric-controlled switch of low level control circuit control that is subjected to of described second load with the extremely direct-connected electric-controlled switch that controlled by high-order control circuit of described first load.This typical control mode, realized the switching of power supply direction at relative the two poles of the earth of load simply, electric-controlled switch has fast, accurately, characteristics such as efficient, low-power consumption, can be directly and Microprocessor Interface, use the PWM technology and realize DC motor speed-regulating control, this drive circuit can satisfy all kinds direct current machine demand at low cost.
Need to prove that " electric charge pond " in this article refers to a kind of circuit element that comprises two ends, it can discharge and recharge, and both end voltage can not be suddenlyd change.For example, electric charge being had the electric capacity of build-up effect is exactly a kind of good electric charge pond.
Disclosed embodiment of the present utility model in the mode that illustrates and give an example in the following explanation, from becoming more obvious below in conjunction with the description of the drawings other targets of the present utility model and advantage.
[description of drawings]
Below with reference to accompanying drawing embodiment of the present utility model is described more fully, wherein:
Fig. 1 is the circuit diagram according to the embodiment of a kind of analog line driver of the utility model, and it is connected on the direct current machine.
[embodiment]
With reference now to accompanying drawing, describe the utility model embodiment preferred, wherein identical label is used for guiding identical element all the time.Purpose for explaining provides many details in the following description, understands in depth so that the utility model provided.Yet this may be conspicuous, does not have these details, and this utility model still can be implemented.
Fig. 1 has shown the circuit diagram according to the embodiment of a kind of analog line driver 100 of the utility model, and it is connected on a load is on the direct current machine M1.Analog line driver 100 comprises 10,12 and two low level control circuits 20,22 of two high-order control circuits.Each control circuit control electric-controlled switch MF1, a MF2, MF3, MF4, specifically be the first high-order control circuit 10 controls first electric-controlled switch MF1, the second high-order control circuit 12 controls second electric-controlled switch MF2, the first low level control circuit, 20 controls the 3rd electric-controlled switch MF3, the second low level control circuit, 22 controls the 4th electric-controlled switch MF4.Each electric-controlled switch MF1, MF2, MF3, MF4 comprise grid 102,122,202,222, source electrode 104,124,204,224 and drain 106,126,206,226.In according to embodiment of the present utility model, this electric-controlled switch MF1, MF2, MF3, MF4 is a power MOSFET, power MOSFET is voltage-controlled element, it is big to have input impedance, switching speed is fast, characteristics such as no secondary-breakdown phenomenon, can satisfy speed-sensitive switch action demand, at grid 102,122,202,222 with source electrode 104,124,204, when the voltage between 224 reaches specified trigger voltage, source electrode 104,124,204,224 and drain 106,126,206,226 conductings, otherwise source electrode 104,124,204,224 and drain 106,126,206,226 end.
Driving power is a DC power supply, and its minus earth, positive pole are connected to driving power end V
sIn electric-controlled switch MF1, the MF2 of two high- order control circuit 10,12 controls, drain electrode 106,126 all is electrically connected to DC driven power end V
sSource electrode 104,124 is connected respectively to relatively end B1, the B2 of corresponding high- order control circuit 10,12, and simultaneously, source electrode 104,124 also is connected respectively to the first load utmost point 50 of direct current machine M1 and the second relative load utmost point 52; 102,122 control end DH1, DH2 that are connected respectively to corresponding high- order control circuit 10,12 of grid.In electric-controlled switch MF 3, the MF4 of 20,22 controls of two low level control circuits, drain electrode 206,226 is connected respectively to relative the two poles of the earth 50,52 of described direct current machine M1, source electrode 204,224 all is connected to ground, 202,222 control end DL1, DL2 that are connected respectively to corresponding low level control circuit 20,22 of grid.
Characteristics of the embodiment of the utility model analog line driver 100 are, source electrode is connected to earthy electric-controlled switch MF3, MF4 and drives with low level control circuit 20,22, and other electric-controlled switchs MF1, MF2 just use high- order control circuit 10,12 to drive.The structure of high- order control circuit 10,12 and low level control circuit 20,22 will be discussed in more detail below, generally speaking, the structure of high- order control circuit 10,12 is than low level control circuit 20,22 complexity, and with regard to cost, high- order control circuit 10,12 is more higher relatively than low level control circuit 20,22.According to the utility model embodiment, rationally use the combination of distinguishing high and low position control circuit, controlled the cost of analog line driver 100 integral body effectively.
Each control circuit 10,12,20,22 has signal input part H1, a H2, L1, the L2 can be directly and microprocessor (not shown) interface, and microprocessor applications PWM technology export is with the control signal of square wave representative " leading to " and " breaking ".In the present embodiment, the control signal of low level square wave representative " leading to ", the control signal of the square wave representative " breaking " of high level.Table 1 shows input, the output truth table of analog line driver 100 shown in Figure 1, typically, in the present embodiment, the true value of input the utility model analog line driver 100 has two groups, the corresponding one group of true value of output after the processing of every group of true value process the utility model analog line driver 100 and the effect of interlock circuit, the back also will be described the operation principle and the details of circuit in detail.1 represents high potential in the truth table, and 0 represents electronegative potential.
The input of table 1 analog line driver shown in Figure 1, output truth table
In the present embodiment, the basic purpose of this circuit is the switching that realizes two rightabout power supplies of direct current machine M1 winding.In conjunction with reference to Fig. 1, when from microprocessor during to first group of true value shown in the utility model analog line driver 100 input tables 1, according to the output true value of correspondence as seen, because DH1 is a high potential, the trigger voltage of the first electric-controlled switch MF1 can reach, so the first electric-controlled switch MF1 conducting; Because DH2 is an electronegative potential, the trigger voltage of the second electric-controlled switch MF2 can not reach, so the second electric-controlled switch MF2 ends; Correspondingly, DL1 is an electronegative potential, and the 3rd electric-controlled switch MF3 ends; DL2 is a high potential, the 4th electric-controlled switch MF4 conducting.As a result, electric current will be from driving power end V
sFlow to ground by the first electric-controlled switch MF1, the first load utmost point 50, direct current machine M1, the second load utmost point 52 and the 4th electric-controlled switch MF4 successively.In like manner, when from microprocessor during to second group of true value shown in the utility model analog line driver 100 input tables 1, according to the output true value of correspondence as can be known, DH1 is an electronegative potential, and the first electric-controlled switch MF1 ends; DH2 is a high potential, the second electric-controlled switch MF2 conducting; DL1 is a high potential, the 3rd electric-controlled switch MF3 conducting; DL2 is an electronegative potential, and the 4th electric-controlled switch MF4 ends.As a result, electric current will be from driving power end V
sFlow to ground by the second electric-controlled switch MF2, the second load utmost point 52, direct current machine M1, the first load utmost point 50 and the 3rd electric-controlled switch MF3 successively.When supposing electric current through direct current machine M1, are forwards from the first load utmost point, 50 to the second load utmost points 52, direct current machine M1 just changes, and is oppositely from the second load utmost point, 52 to the first load utmost points 50 then, direct current machine M1 counter-rotating.Therefore, when importing first group of true value, direct current machine M1 just changes, when importing second group of true value, and direct current machine M1 counter-rotating.This typical control mode, realized switching simply to the power supply direction at relative the two poles of the earth of direct current machine, electric-controlled switch has fast, accurately, characteristics such as efficient, low-power consumption, can be directly and Microprocessor Interface, use the PWM technology and realize DC motor speed-regulating control, this drive circuit can satisfy all kinds direct current machine demand at low cost.
The first high-order control circuit 10 is identical with second high-order control circuit 12 structures, and for expressing for simplicity, in Fig. 1, the internal circuit configuration of the second high-order control circuit 12 is omitted.Be example only below, the circuit structure of high- order control circuit 10,12 is described with the first high-order control circuit 10.High-order control circuit 10 comprises that three control element Q1, Q2, Q5, electric charge pond C1, signal input part H1, first dc power supply terminal DC1, second dc power supply terminal DC2, control end DH1 and one relatively hold B1.The first dc power supply terminal DC1 and the second dc power supply terminal DC2 are connected respectively to the current potential that has certain electrical potential difference with respect to earth potential, in the present embodiment, the current potential of the second dc power supply terminal DC2 is greater than the trigger voltage of electric-controlled switch MF1, MF2, and the current potential of the first dc power supply terminal DC1 is lower than the second dc power supply terminal DC2.The current potential of " breaking " control signal of the high level of the current potential of the first dc power supply terminal DC1 and microprocessor output is suitable substantially.
When signal input part H1 receives " breaking " control signal, signal input part H1 is in high potential state because of the square wave that receives high level, this high potential is delivered to the emitter of control element Q1 by the resistance R 2 of polyphone, so the current potential of the emitter of control element Q1 and the first dc power supply terminal DC1 are delivered to the current potential of base stage of control element Q1 by the resistance R 1 of contacting suitable, control element Q1 ends, therefore the collector electrode of control element Q1 does not have electric current by serial resistance R5 and asymmetrical circuit element D1 substantially with the circuit that the second dc power supply terminal DC2 is connected, there is not pressure drop substantially in resistance R 5 two ends, that is, substantially there is not electrical potential difference between the emitter of control element Q2 and the base stage, so control element Q2 also ends.Typically, in the present embodiment, asymmetrical circuit element D1 adopts crystal diode commonly used, its technology maturation, and simple in structure and stable performance, cost is also low, can realize the charge and discharge control to electric charge pond C1 under prerequisite cheaply.At this moment, as previously mentioned, the 3rd electric-controlled switch MF3 is conducting, and control end B1 will be by the 3rd electric-controlled switch MF3 ground connection, so being higher than earthy second dc power supply terminal DC2 will charge to electric charge pond C1 by asymmetrical circuit element D1.In the present embodiment, electric charge pond C1 is an electric capacity, typically, is the bigger electrochemical capacitor of Capacity Ratio.Electric charge pond C1 is charged and store charge by the second dc power supply terminal DC2.Simultaneously,, do not have electric current to pass through resistance R 8 substantially, do not have pressure drop on the resistance R 8 substantially,, and keep low-potential state so the base stage of control element Q5 is basic with collector electrode and relatively hold the current potential of B1 identical because control element Q2 ends.If control end DH1 current potential is higher than and relatively holds B1, control element Q5 makes control end DH1 and relatively holds the electrical potential difference between the B1 to keep low-level, conducting much smaller than the specified trigger voltage of electric-controlled switch MF1.Therefore, control element Q5 can and relatively hold the electrical potential difference between the B1 stably to lock low-level with control end DH1.
When signal input part H1 receives " leading to " control signal, on the contrary, signal input part H1 is in low-potential state, the current potential of the emitter of control element Q1 is lower than the first dc power supply terminal DC1 and the current potential of the base stage that is attached thereto, control element Q1 conducting, so the collector electrode of control element Q1 has electric current, cause resistance R 5 two ends to produce pressure drop, that is, there is electrical potential difference between the emitter of control element Q2 and the base stage, so control element Q2 conducting.As previously mentioned, according to first group of true value shown in the table 1, the 4th electric-controlled switch MF4 conducting, thus the second load utmost point 52 is equivalent to ground connection, and its current potential is zero substantially.But,, when passing through current switching direction wherein or suddenling change, will produce very big inverse electromotive force because the winding of motor M 1 is very big inductance element.When signal input part H1 receives " leading to " control signal, between the two load utmost points 50,52, produce electrical potential difference owing to current break in the winding of motor M 1, so the current potential of the first load utmost point 50 will far above with the second load utmost point 52 that is equivalent to ground connection, so the first load utmost point 50 and coupled relatively end B1 will be far above earth potentials, relatively hold the current potential of B1 often far to exceed the current potential of the second dc power supply terminal DC2 in the practice.Because electric charge pond C1 both end voltage can not be suddenlyd change, C1 anodal current potential in electric charge pond is higher than the relatively end B1 that links to each other with its negative pole, so electric charge pond C1 positive pole more is higher than the current potential of the second dc power supply terminal DC2, asymmetrical circuit element D1 ends.So, electric current reaches control end DH1 through positive pole, control element Q2, diode D2, the resistance R 7 of electric charge pond C1 successively, so control end DH1 and relatively hold electrical potential difference between the B1 to equal voltage between C1 the two poles of the earth, electric charge pond to deduct pressure drop on control element Q2, diode D2 and resistance R 7, it will be appreciated by those skilled in the art that, by selecting suitable parameters, but retentive control end DH1 and relatively hold between the B1 electrical potential difference still greater than the specified trigger voltage of electric-controlled switch MF1.Preferably, also be connected with capacitor C in parallel 2 and zener ZD1 between the B1 with relatively holding at control end DH1, be used for stablizing control end DH1's and relatively hold voltage between the B1.For control element Q5, because the pressure drop on this moment diode D2 and the resistance R 7, base potential is higher than emitter, so control element Q5 ends.
The first low level control circuit 20 is identical with the second low level control circuit, 22 structures, and for expressing for simplicity, in Fig. 1, the internal circuit configuration of the second low level control circuit 22 is omitted.Be example only below, the circuit structure of low level control circuit 20,22 is described with the first low level control circuit 20.Low level control circuit 20 comprises three control element Q3, Q4, Q6, signal input part L1, first dc power supply terminal DC1, second dc power supply terminal DC2, and control end DL1, the first dc power supply terminal DC1 and the second dc power supply terminal DC2 are connected respectively to two current potentials that have the predetermined potential difference with respect to earth potential, in the present embodiment, the second dc power supply terminal DC2 is greater than the trigger voltage of electric-controlled switch MF3, MF4, and the current potential of the first dc power supply terminal DC1 is lower than the second dc power supply terminal DC2.The current potential of " breaking " control signal of the high level of the current potential of the first dc power supply terminal DC1 and microprocessor output is suitable substantially.
When the signal input part L1 of low level control circuit 20 receives " breaking " control signal, signal input part L1 is in high potential state because of the square wave that receives high level, this high potential is delivered to the emitter of control element Q3 by the resistance R 3 of polyphone, so the current potential of the emitter of control element Q3 is suitable substantially with the current potential of the base stage that the first dc power supply terminal DC1 is delivered to control element Q3, control element Q3 ends, therefore the collector electrode of control element Q3 does not have electric current substantially, that is there is not electric current substantially with the circuit that the second dc power supply terminal DC2 is connected by serial resistance R6, there is not pressure drop substantially in resistance R 6 two ends, that is, substantially there is not electrical potential difference between the emitter of control element Q4 and the base stage, so control element Q4 also ends, that is the current potential of the second dc power supply terminal DC2 can not be delivered to control end DL1 by control element Q4 and by resistance R 9.Further, the high potential of signal input part L1 is delivered to the base stage of control element Q6 by the resistance R 4 of polyphone, because the emitter of control element Q6 is connected to ground, so there is the voltage of forward between the base stage of control element Q6 and the emitter, thereby control element Q6 is in conducting state, that is, control end DL1 is in zero potential substantially with the ground conducting, have very little electrical potential difference (equaling the collector electrode of control element Q6 and the pressure drop between the emitter) in other words between control end DL1 and the ground, the electrical potential difference between control end DL1 and the ground is locked to much smaller than the state of the trigger voltage of electric-controlled switch MF3.Thereby electric-controlled switch MF3 can not trigger, thereby is in cut-off state.
On the contrary, when signal input part L1 receives " leading to " control signal, control element Q3 conducting, also conducting of control element Q4, control element Q6 ends.The current potential of control end DL1 equals the current potential down control element Q4 of the second dc power supply terminal DC2 and the pressure drop of resistance R 9, because this pressure drop is very little, the current potential of control end DL1 equals the current potential of the second dc power supply terminal DC2 substantially, because the current potential of the second dc power supply terminal DC2 is greater than the trigger voltage of electric-controlled switch MF3, so the electrical potential difference between control end DL1 and the ground is greater than the trigger voltage of electric-controlled switch MF3, electric-controlled switch MF3 triggers and conducting.Wherein, the switching that this control element Q6 realizes according to control signal can improve the stability to the control of control end DL1 current potential in the low level control circuit 20.Preferably, between control end DL1 and ground, also be connected with capacitor C 3, be used for stablizing the current potential of control end DL1.
Can see that by above stated specification low level control circuit 20 is done to such an extent that cost is lower than high-order control circuit 10 is simple.Shown in the present embodiment, when high and low position control circuit is used to drive the matrix of four voltage-controlled type electronic devices and components MF1, MF2, MF3, MF4, lower-cost low level control circuit 20,22 can be used to drive source electrode 204,224 and be connected earth potential and current potential voltage-controlled type electronic devices and components MF3, the MF4 fixing with respect to earth potential, and only be useful on when driving current potential with respect to unsteady voltage-controlled type electronic devices and components MF1, the MF2 of earth potential, just use high-order control circuit 10,12.Cost is higher because the relative low level control circuit of high- order control circuit 10,12 20,22 is more complicated, like this when the quantity of the high- order control circuit 10,12 of minimizing, thereby has reduced the cost of analog line driver 100 integral body.
Embodiment according to analog line driver 100 of the present utility model, it utilizes the control signal of microprocessor output, rule according to drive signal itself, C1 fills to the electric charge pond, discharge, because electric charge pond C1 both end voltage can not be suddenlyd change, C1 discharge in electric charge pond the time makes control end DH1 superpose relatively holding on the basic current potential of B1, make under the situation of relatively holding B1 current potential rising certain amplitude, the current potential of the control end DH1 corresponding amplitude that also can raise, thereby retentive control end DH1 and relatively hold electrical potential difference between the B1 greater than specified trigger voltage, realized that control end DH1 is with respect to the lifting of relatively holding B1 voltage, and then realized under dc power supply terminal DC2 low-voltage condition, height being driven the driving of voltage-controlled type electronic devices and components MF1.
That is to say, when the signal input part H1 of high- order control circuit 10,12, control signal that H2 receives change, it relatively holds B1, B2 current potential to have variation, but no matter relatively hold B1, B2 current potential how to change, high- order control circuit 10,12 still can and relatively be held the certain driving voltage of output between B1, the B2 at control end DH1, DH2.
Typically, in the present embodiment, control element Q1 to Q6 realizes with transistor commonly used, its technology maturation, and simple in structure and stable performance, cost is also low, can realize the charge and discharge control to the electric charge pond under prerequisite cheaply.As a whole, this analog line driver 100 all adopts common triode, resistance, diode and electric capacity, is easy to buying and with low cost.
Be appreciated that owing to this function actuator 100, for driving power end V from above stated specification
s, the first dc power supply terminal DC1 and the second dc power supply terminal DC2, can use same DC power supply to adopt the laggard row power supply of dividing potential drop technology dividing potential drop of known maturation, thereby omit a plurality of insulating power supplies, only need single power supply can realize the driving of a plurality of MOSFET, especially for driven MOS FET matrix and many current potentials MOSFET matrix, drive circuit and power circuit have then been simplified greatly, and problem of withstand voltage between a plurality of insulating power supplies of needing in the common type of drive having avoided greatly reduces cost and has improved reliability greatly.
Though the utility model is in this demonstration and description, wherein imagination is most realistic and embodiment preferred, can recognize, in scope of the present utility model, can make a change, be not to be only limited to details described herein, but to meet the four corner of claims, to comprise any and all equality units and equipment.For example, though with reference to the transistorized configuration of this polarity of the utility model the utility model embodiment has been described, technical solutions of the utility model go for the transistorized configuration of opposite polarity equally.Again for example, according to embodiment of the present utility model, function actuator 100 is to be used to drive direct current machine M1, in fact, also is applicable to the high-power inductive load that drives other, as stepping motor, pump motor etc.And further, in the embodiment for example of the present utility model, high-order control circuit 10 adopts three transistor Q1 to Q6 to do control element respectively with low level control circuit 20 and realizes, but control element 400 also can replace with other circuit of identical function, realizes and aforementioned similar function.For those skilled in the art, these all are equal to.
Claims (10)
1. an analog line driver (100) is used for driving high power load (M1) according to control signal, and it is characterized in that: it comprises:
High-order control circuit (10,12), comprise electric charge pond (C1), signal input part (H1, H2), dc power supply terminal (DC2), control end (DH1, DH2) and relatively hold (B1, B2), dc power supply terminal (DC2) is connected to the current potential that has certain electrical potential difference with respect to earth potential;
When signal input part (H1, H2) receives " breaking " control signal, electric charge pond (C1) is by dc power supply terminal (DC2) charging and store charge, but this moment control end (DH1, DH2) with relatively between the end (B1, B2) maintenance less than the electrical potential difference of certain trigger voltage;
When signal input part (H1, H2) receives " leading to " control signal, electric charge pond (C1) is by connecting the control end (DH1, DH2) and the circuit discharging of end (B1, B2) relatively respectively, makes control end (DH1, DH2) and relatively holds between (B1, B2) electrical potential difference greater than described trigger voltage.
2. analog line driver as claimed in claim 1 (100), it is characterized in that: it comprises low level control circuit (20,22), comprise signal input part (L1, L2), dc power supply terminal (DC2) and control end (DL1, DL2), dc power supply terminal (DC2) is connected to the current potential that has the predetermined potential difference with respect to earth potential, in this low level control circuit (20,22):
When signal input part (L1, L2) received " breaking " control signal, the electrical potential difference between control end (DL1, DL2) and the ground was less than aforementioned trigger voltage;
When signal input part (L1, L2) received " leading to " control signal, the electrical potential difference between control end (DL1, DL2) and the ground was greater than aforementioned trigger voltage.
3. analog line driver as claimed in claim 1 (100) is characterized in that: when the control signal that receives when the signal input part (H1, H2) of high-order control circuit (10,12) changed, it relatively held (B1, B2) current potential to exist to change.
4. analog line driver as claimed in claim 3 (100), it is characterized in that: between dc power supply terminal (DC2) and electric charge pond, be connected with asymmetrical circuit element (D1), when the signal input part (H1, H2) of high-order control circuit (10,12) receives " leading to " control signal, asymmetrical circuit element (D1) ends, when the signal input part (H1, H2) of high-order control circuit (10,12) receives " breaking " control signal, asymmetrical circuit element (D1) conducting.
5. analog line driver as claimed in claim 1 (100), it is characterized in that: at high-order control circuit (10,12) in, control end (DH1, DH2) and relatively hold (B1, B2) be connected with control element (Q5) between, as signal input part (H1, when H2) receiving " breaking " control signal, this control element (Q5) makes control end (DH1, DH2) and relatively hold (B1, B2) be in conducting state between, as signal input part (H1, when H2) receiving " leading to " control signal, this control element (Q5) makes control end (DH1, DH2) and relatively hold (B1, B2) be in cut-off state between.
6. analog line driver as claimed in claim 2 (100), it is characterized in that: in low level control circuit (20,22), be connected with control element (Q6) between control end (DL1, DL2) and the ground, when signal input part (L1, L2) receives " breaking " control signal, this control element (Q6) makes between control end (DL1, DL2) and the ground and is in conducting state, when signal input part (L1, L2) received " leading to " control signal, this control element (Q6) made between control end (DL1, DL2) and the ground and is in cut-off state.
7. analog line driver as claimed in claim 1 (100), it is characterized in that: at high-order control circuit (10,12) in, electric charge pond (C1) with relatively the end (B1, B2) extremely relative another utmost point and a control end (DH1 who is connected, DH2) be connected with control element (Q2) between, as signal input part (H1, when H2) receiving " leading to " control signal, this control element (Q2) makes control end (DH1, DH2) and between electric charge pond (C1) be in conducting state, as signal input part (H1, when H2) receiving " breaking " control signal, this control element (Q2) makes control end (DH1, DH2) and between electric charge pond (C1) be in cut-off state.
8. analog line driver as claimed in claim 2 (100), it is characterized in that: at low level control circuit (20,22) in, control end (DL1, DL2) and be connected with control element (Q4) between the dc power supply terminal (DC2), as signal input part (L1, when L2) receiving " leading to " control signal, this control element (Q4) makes control end (DL1, DL2) and between the dc power supply terminal (DC2) be in conducting state, as signal input part (L1, when L2) receiving " breaking " control signal, this control element (Q6) makes control end (DL1, DL2) and between the dc power supply terminal (DC2) be in cut-off state.
9. as each described analog line driver (100) in the claim 2 to 8, it is characterized in that: it comprises two high-order control circuits (10,12) and two low level control circuits (20,22), each control circuit is controlled at least one electric-controlled switch (MF1, MF2, MF3, MF4), each electric-controlled switch (MF1, MF2, MF3, MF4) comprise grid (102,122,202,222), source electrode (104,124,204,224) and the drain electrode (106,126,206,226), at grid (102,122,202,222) with source electrode (104,124,204, when the voltage 224) reaches aforesaid trigger voltage, source electrode (104,124,204,224) and the drain electrode (106,126,206,226) conducting, otherwise source electrode (104,124,204,224) and the drain electrode (106,126,206,226) end; In the electric-controlled switch (MF1, MF2) of two high-order control circuits (10,12) control, drain electrode (106,126) all is electrically connected to a utmost point (VS) of DC driven power supply, source electrode (104,124) is connected respectively to the relatively end (B1, B2) of corresponding high-order control circuit (10,12) and is connected respectively to the relative first load utmost point (50) and the second load utmost point (52) of load (M1), and grid (102,122) then is connected respectively to the control end (DH1, DH2) of corresponding high-order control circuit (10,12); In the electric-controlled switch (MF3, MF4) of two low level control circuits (20,22) control, drain electrode (206,226) is connected respectively to relative the two poles of the earth (50,52) of described load (M1), source electrode (204,224) all is connected to ground, and grid (202,222) then is connected respectively to the control end (DL1, DL2) of corresponding low level control circuit (20,22).
10. analog line driver as claimed in claim 9 (100), it is characterized in that: during with direct-connected electric-controlled switch (MF1) conducting that is subjected to high-order control circuit (10) control of the described first load utmost point (50), with the direct-connected also conducting of electric-controlled switch (MF4) that is subjected to low level control circuit (22) control of the described second load utmost point (52), other two electric-controlled switchs (MF2, MF3) then end; When ending with the direct-connected electric-controlled switch (MF1) that controlled by high-order control circuit (10) of the described first load utmost point (50), also end other then conductings of two electric-controlled switchs (MF2, MF3) with the direct-connected electric-controlled switch (MF4) of low level control circuit (22) control that is subjected to of the described second load utmost point (52).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202192693U CN201639533U (en) | 2009-09-30 | 2009-09-30 | Power driver |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009202192693U CN201639533U (en) | 2009-09-30 | 2009-09-30 | Power driver |
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| Publication Number | Publication Date |
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| CN201639533U true CN201639533U (en) | 2010-11-17 |
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| CN2009202192693U Expired - Lifetime CN201639533U (en) | 2009-09-30 | 2009-09-30 | Power driver |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425836A (en) * | 2017-08-16 | 2017-12-01 | 上海绘润实业有限公司 | A kind of mosfet driver |
-
2009
- 2009-09-30 CN CN2009202192693U patent/CN201639533U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107425836A (en) * | 2017-08-16 | 2017-12-01 | 上海绘润实业有限公司 | A kind of mosfet driver |
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