CN203434907U - Improved h bridge circuit - Google Patents
Improved h bridge circuit Download PDFInfo
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- CN203434907U CN203434907U CN201320386583.7U CN201320386583U CN203434907U CN 203434907 U CN203434907 U CN 203434907U CN 201320386583 U CN201320386583 U CN 201320386583U CN 203434907 U CN203434907 U CN 203434907U
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Abstract
The utility model discloses an improved H bridge circuit which can greatly improve the frequency of an input PWM wave to improve the stability of output current. The improved H bridge circuit comprises an upper bridge circuit, a lower bridge circuit and a gating module. The upper bridge circuit and the lower bridge circuit are composed of two groups of transistors which are in mirroring arrangement and logic rotation switches. The gating module is used for carrying out gating on interleaved switching on and off of two groups of transistors which are in mirroring arrangement in upper and lower bridge circuits. Dual transistors are connected in parallel to form a group, and the rotation gating module is added to replace a traditional H bridge single transistor. The input PWM wave frequency is improved nearly one time compared with the input PWM wave frequency of a traditional H bridge circuit. The stability of the output current of the bridge circuit is greatly enhanced.
Description
Technical field
The utility model patent relates to the H bridge circuit using in industrial control field, and especially perseverance flows the H bridge circuit using in stepping, motor servo driver mutually, and the H bridge circuit chip of integrated special use also can relate to the thinking of this patent.
Background technology
At present, in industrial control field, in the drive circuit of especially stepping, servomotor, it is the mainstream technology method in this field to the steady copped wave of output current phase that PWM controls the realization of H bridge circuit.As shown in Figure 2, Q1-Q4 is 4 triodes, can be also the combination of MOSFET and diode, and L represents motor coil, and PWM1 and PWM2 are a pair of positive and negative PWM ripples.By 4 single triodes, form doube bridge road, wherein, Q1, Q2 is upper bridge PNP pipe, Q3, Q4 is lower bridge NPN pipe, PWM1 accesses Q1, the base stage of Q3, PWM2 accesses Q2, the base stage of Q4, like this, and during due to Q1 conducting, Q2, Q3 cut-off, Q4 conducting, electric current increases; Otherwise, during Q2 conducting, Q1, Q4 cut-off, Q3 conducting, electric current reduces, and PWM ripple is controlled conducting and the cut-off of upper and lower pipe, and the ON time of the forward and reverse electric current of duty cycle adjustment by PWM ripple, can carry out copped wave processing to electric current, realizes the copped wave current stabilization to output current.In this process, PWM wave frequency is higher, and output current value is more stable, ripple amplitude, and motor operation is more steady, and noiseproof feature is better.But, because heating and the switching frequency relation of triode itself are known, PWM wave frequency is higher, the switching frequency that is triode is higher, its caloric value is larger, and the performance parameter of triode is caused to negative effect, causes in actual application, owing to being subject to the restriction of H bridge circuit, PWM ripple chopping frequency can only arrive 20-40KHz.
Summary of the invention
For the problems referred to above, the related a kind of modified model H bridge circuit of the utility model is subject to the restriction of caloric value in order to overcome the switching frequency of existing H bridge circuit, existing H bridge circuit is improved and optimizated, novel H bridge circuit in design one, make each triode when not increasing caloric value and power consumption, in order to improve PWM wave frequency.
The utility model, in order to realize the problems referred to above, can be used following scheme:
This is practical newly provides a kind of modified model H bridge circuit, comprise: upper bridge circuit and lower bridge circuit, motor coil in parallel between upper bridge circuit and lower bridge circuit, it is characterized in that: the positive-negative-positive triode that two arrangement of mirrors pictures arrange, be respectively the positive-negative-positive triode (Q1-1 that the first arrangement of mirrors picture arranges, Q2-1) the positive-negative-positive triode (Q1-2, Q2-2) that and the second arrangement of mirrors picture arranges, connects with common collector between the positive-negative-positive triode that two arrangement of mirrors pictures arrange, the NPN type triode that two arrangement of mirrors pictures arrange, be respectively the NPN type triode (Q3-1 that the first arrangement of mirrors picture arranges, Q4-1) the positive-negative-positive triode (Q3-2, Q4-2) that and the second arrangement of mirrors picture arranges, connects with common emitter between the NPN type triode that two arrangement of mirrors pictures arrange, four logic rotation switches, two logic rotation switches are first group of logic rotation switch, and two other logic rotation switch is second group of logic rotation switch, and each logic rotation switch comprises two input ports and two output ports, and gating module, produce pwm signal, pwm signal is divided into positive pwm signal and negative pwm signal, and respectively to the input of four logic rotation switches send positive pwm signal, negative PWM model and with the synperiodic square-wave signal of pwm signal, for to the NPN triode of the PNP triode of two arrangement of mirrors picture settings and two arrangement of mirrors picture settings open and gating is carried out in cut-off, wherein, between the positive-negative-positive triode of two arrangement of mirrors picture settings, emitter is connected with emitter and is connected power supply, between the NPN type triode that two arrangement of mirrors pictures arrange, collector electrode is connected with collector electrode, emitter is connected with emitter and ground connection, between the positive-negative-positive triode that the NPN type triode that two arrangement of mirrors pictures arrange arranges with two arrangement of mirrors pictures, collector electrode is connected with collector electrode, the base stage of the NPN triode that the output port of first group of logic rotation switch arranges with two arrangement of mirrors pictures is respectively connected, bridge circuit on composition (11), the base stage of the PNP triode that the output port of second group of logic rotation switch arranges with two arrangement of mirrors pictures is respectively connected, form lower bridge circuit (12).
The H type bridge circuit that the utility model is related, first group of logic rotation switch (U1, the base stage of the positive-negative-positive triode that U2), corresponding pair of output mouth (C) arranges with the first arrangement of mirrors picture of upper bridge circuit is respectively connected, the base stage of the positive-negative-positive triode that another arranges with the second arrangement of mirrors picture respectively output port (D) is connected, second group of logic rotation switch (U3, the base stage of the NPN type triode that U4), corresponding pair of output mouth (G) arranges with the first arrangement of mirrors picture of lower bridge circuit is respectively connected, the base stage of the NPN type triode that another arranges with the second arrangement of mirrors picture respectively output port (H) is connected.
Further, square-wave signal sends to respectively four logic rotation switch (U1, U2, U3, U4) a input port (A), positive pwm signal sends to respectively an input port (B) of the logic rotation switch (U1) in first group of logic rotation switch and an input port (F) of the logic rotation switch (U4) in second group of logic rotation switch, negative pwm signal sends to respectively an input port (B) of another logic rotation switch (U2) and another logic rotation switch (U3) input port (F) of second group of logic rotation switch of first group of logic rotation switch.
In addition, the pwm signal of input is in one-period, when square-wave signal is during in first cycle, the NPN type triode conducting work of the positive-negative-positive triode of the second arrangement of mirrors picture symmetry and the first arrangement of mirrors picture symmetry forms a H type bridge circuit, when square-wave signal is during in next cycle, the NPN type triode conducting work of the positive-negative-positive triode of the first arrangement of mirrors picture symmetry and the second arrangement of mirrors picture symmetry forms a H type bridge circuit.
The effect of utility model
The beneficial effects of the utility model are, when this novel H bridge circuit of application, input PWM wave frequency significantly improves, and can bring up to 40-70KHz by original 20-40KHz, the stability of H bridge output current improves, and motor rotation stationarity, noise performance are all greatly increased.And circuit theory is easily understood, physical circuit implements also and is easier to.
Accompanying drawing explanation
Fig. 1 is the utility model H bridge circuit schematic diagram.
Fig. 2 is traditional H bridge circuit schematic diagram.
Embodiment
Below in conjunction with drawings and Examples, the preferred embodiment of the related a kind of modified model H bridge circuit of the utility model is done to detailed elaboration, but the utility model is not limited only to this embodiment.In order to make the public that the utility model is had thoroughly and be understood, in below to preferred embodiment of the present utility model, describe detail in detail.
Fig. 1 is the utility model H bridge circuit schematic diagram.
As shown in Figure 1, follow-on H type bridge circuit, comprise: 8 triodes, the positive-negative-positive triode (Q1-1, Q2-1) that the first arrangement of mirrors picture arranges, positive-negative-positive triode (the Q1-2 that the second arrangement of mirrors picture arranges, Q2-2), the NPN type triode (Q3-2 that the NPN type triode (Q3-1, Q4-1) that the first arrangement of mirrors picture arranges and the second arrangement of mirrors picture arrange, Q4-2), above-mentioned triode also can be MOSFET and diode combinations replacement; Motor coil L; Four logic rotation switches (U1, U2, U3, U4) and gating module.
The NPN type triode (Q3-2, Q4-2) that the NPN type triode (Q3-1, Q4-1) that the first arrangement of mirrors picture arranges and the second arrangement of mirrors picture arrange and logic rotation switch U3 and logic rotation switch U4 form lower bridge circuit 12.Common emitter ground connection between the NPN type triode that two arrangement of mirrors pictures arrange, NPN type triode Q3-1 is connected with NPN type triode Q3-2 common collector, and NPN type triode Q4-1 is connected with positive-negative-positive triode Q4-2 common collector.
The collector electrode parallel-connected induction motors coil L that is connected with collector electrode between the NPN type triode (Q3-1, Q4-1, Q3-2, Q4-2) of the positive-negative-positive triode (Q1-1, Q2-1, Q1-2, Q2-2) that two arrangement of mirrors pictures arrange and the setting of two arrangement of mirrors pictures.
Four logic rotation switch U1, U2, U3, U4 all has 2 inputs and two outputs.First group of logic rotation switch is comprised of logic rotation switch U1 and logic rotation switch U2, and the output port C of logic rotation switch U1 is connected with the base stage of triode Q2-1, and the corresponding output port C of logic rotation switch U2 is connected with the base stage of triode Q1-1.Another output port D of logic rotation switch U1 is connected with the base stage of triode Q1-2, and another output port D of logic rotation switch U2 is connected with the base stage of triode Q2-2.
Second group of logic rotation switch is comprised of logic rotation switch U3 and logic rotation switch U4, and the output port G of logic rotation switch U3 is connected with the base stage of triode Q3-1, and the corresponding output port G of logic rotation switch U4 is connected with the base stage of triode Q4-1.Another output port H of logic rotation switch U3 is connected with the base stage of triode Q3-2, and another output port H of logic rotation switch U4 is connected with the base stage of triode Q3-2.
Gating module produce pwm signal and with the synperiodic square-wave signal of this pwm signal, gating module is divided into a pwm signal PWM+ who aligns and negative pwm signal PWM-by pwm signal, and respectively positive pwm signal PWM+ is sent to the input port B of logic rotation switch U1 and the input port F of logic rotation switch U4, negative pwm signal PWM-is sent to the input port F of the corresponding input port B of logic rotation switch U2 and logic rotation switch U3, square-wave signal is sent to first group of logic rotation switch U1, the input port A of U2 and second group of logic rotation switch U3, the input port E of U4.
By FPGA programming, be achieved as follows logical relation:
In the one-period of the pwm signal of inputting, the logic of first group of logic rotation switch is: when first rising edge that input port A is square-wave signal, output port C equals the value of input port B, output port D=1, the triode Q1-2 that the second arrangement of mirrors picture that makes to be connected with output port D arranges and triode Q2-2 work, and the triode Q2-1 that the first arrangement of mirrors picture arranges ends with triode Q1-1.The square-wave signal receiving as input port A is during in next rising edge, output port D equals input port B, output port C=1, the triode Q1-1 that the first arrangement of mirrors picture that makes to be connected with output port C arranges and triode Q2-1 work, and the triode Q1-2 that the second arrangement of mirrors picture arranges ends with triode Q2-2.
The logic of second group of logic rotation switch is: when first rising edge that input port E is square-wave signal, output port G equals input port F, output port H=0, the triode Q3-2 that the second arrangement of mirrors picture that makes to be connected with output port H arranges and triode Q4-2 cut-off, and the triode Q3-1 that the first arrangement of mirrors picture arranges and triode Q4-1 conducting work.The square-wave signal receiving as input port E is during in next rising edge, output port H equals input port F, output port G=0, the triode Q3-1 that the first arrangement of mirrors picture that makes to be connected with output port G arranges and triode Q4-1 cut-off, and the triode Q3-2 that the second arrangement of mirrors picture arranges and triode Q4-2 conducting work.
Like this at first PWM in the cycle, when square-wave signal is during in first rising edge, the triode Q3-1 that the positive-negative-positive triode Q1-2 that the second arrangement of mirrors picture arranges and triode Q2-2 conducting work and the first arrangement of mirrors picture arrange and triode Q4-1 conducting work, form a H type electric bridge, when square-wave signal is during in next rising edge, the triode Q3-2 that the triode Q1-1 that the first arrangement of mirrors picture arranges and triode Q2-1 work and the second arrangement of mirrors picture arrange and triode Q4-2 conducting work, form another H type electric bridge.Such as, triode Q1-1, in Q1-2, a triode cut-off is had a rest, another triode work, in next cycle, wheel is changed to the triode work of rest, every group of triode is all alternation like this, suppose that each triode switch has certain frequency, PWM wave frequency is just a times of each triode switch frequency, like this in the situation that original assurance pipe caloric value does not affect performance, significantly improved the PWM wave frequency that controls bridge road, be that chopping frequency significantly improves, the stability of electric current significantly improves, motor running noises reduces, smoothness obviously promotes.
Like this, when this novel H bridge circuit of practical application, PWM wave frequency can be brought up to 40-70KHz, and the caloric value of each triode is suitable while being 20-40KHz with original PWM ripple, the performance of triode is unaffected, and the performance of whole H bridge circuit improves greatly.
In this novel H bridge circuit, main invention thinking is exactly to substitute a triode in present H bridge circuit with two one group of parallel connections of 8 good triodes of consistency, and increase by 4 logic rotation switches, the input of PWM ripple is through logic rotation switch, between double-triode valve, set up switching mechanism in turn, like this, for each triode, its switching frequency is equivalent to 1/2 of PWM ripple frequency, and we just can guarantee that triode caloric value significantly improves the chopping frequency of PWM ripple in the situation that of not affecting its performance like this.
Claims (4)
1. a follow-on H type bridge circuit, comprising: upper bridge circuit and lower bridge circuit, and motor coil in parallel between described upper bridge circuit and lower bridge circuit, is characterized in that:
The positive-negative-positive triode that two arrangement of mirrors pictures arrange, be respectively the positive-negative-positive triode (Q1-1 that the first arrangement of mirrors picture arranges, Q2-1) the positive-negative-positive triode (Q1-2, Q2-2) that and the second arrangement of mirrors picture arranges, connects with common collector between the positive-negative-positive triode that described two arrangement of mirrors pictures arrange;
The NPN type triode that two arrangement of mirrors pictures arrange, be respectively the NPN type triode (Q3-1 that the first arrangement of mirrors picture arranges, Q4-1) the positive-negative-positive triode (Q3-2, Q4-2) that and the second arrangement of mirrors picture arranges, connects with common emitter between the NPN type triode that described two arrangement of mirrors pictures arrange;
Four logic rotation switches, two described logic rotation switches are first group of logic rotation switch, and described in two other, logic rotation switch is second group of logic rotation switch, and described in each, logic rotation switch comprises two input ports and two output ports; And
Gating module, produce pwm signal, described pwm signal is divided into positive pwm signal and negative pwm signal, and respectively to the input of described four logic rotation switches send positive pwm signal, negative PWM model and with the synperiodic square-wave signal of described pwm signal, for to the NPN triode of the PNP triode of described two arrangement of mirrors picture settings and two arrangement of mirrors picture settings open and gating is carried out in cut-off;
Wherein, between the positive-negative-positive triode of described two arrangement of mirrors picture settings, emitter is connected with emitter and is connected power supply,
Between the NPN type triode that described two arrangement of mirrors pictures arrange, collector electrode is connected with collector electrode, and emitter is connected with emitter and ground connection,
Between the positive-negative-positive triode that the NPN type triode that described two arrangement of mirrors pictures arrange arranges with described two arrangement of mirrors pictures, collector electrode is connected with collector electrode and described motor coil in parallel,
The base stage of the NPN triode that the output port of described first group of logic rotation switch arranges with described two arrangement of mirrors pictures is respectively connected, and forms described upper bridge circuit (11),
The base stage of the PNP triode that the output port of described second group of logic rotation switch arranges with described two arrangement of mirrors pictures is respectively connected, and forms described lower bridge circuit (12).
2. H type bridge circuit according to claim 1, is characterized in that:
Wherein, described first group of logic rotation switch (U1, the base stage of the positive-negative-positive triode that U2), corresponding pair of output mouth (C) arranges with the first arrangement of mirrors picture of described upper bridge circuit is respectively connected, the base stage of the positive-negative-positive triode that another arranges with described the second arrangement of mirrors picture respectively output port (D) is connected
Described second group of logic rotation switch (U3, the base stage of the NPN type triode that U4), corresponding pair of output mouth (G) arranges with the first arrangement of mirrors picture of described lower bridge circuit is respectively connected, and the base stage of the NPN type triode that another arranges with described the second arrangement of mirrors picture respectively output port (H) is connected.
3. H type bridge circuit according to claim 1, is characterized in that:
Wherein, described square-wave signal sends to respectively an input port (A) of described four logic rotation switches (U1, U2, U3, U4),
Described positive pwm signal sends to respectively an input port (B) of the logic rotation switch (U1) in described first group of logic rotation switch and an input port (F) of the logic rotation switch (U4) in described second group of logic rotation switch
Described negative pwm signal sends to respectively an input port (B) of another logic rotation switch (U2) and another logic rotation switch (U3) input port (F) of described second group of logic rotation switch of described first group of logic rotation switch.
4. H type bridge circuit according to claim 1, is characterized in that:
Wherein, the pwm signal of input is in one-period, and when described square-wave signal is during in first rising edge, the NPN type triode conducting work of the positive-negative-positive triode of described the second arrangement of mirrors picture symmetry and described the first arrangement of mirrors picture symmetry forms a H type bridge circuit,
When described square-wave signal is during in next rising edge, the NPN type triode conducting work of the positive-negative-positive triode of described the first arrangement of mirrors picture symmetry and described the second arrangement of mirrors picture symmetry forms a H type bridge circuit.
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| CN201320386583.7U CN203434907U (en) | 2013-07-01 | 2013-07-01 | Improved h bridge circuit |
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| CN201320386583.7U CN203434907U (en) | 2013-07-01 | 2013-07-01 | Improved h bridge circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378095A (en) * | 2013-08-14 | 2015-02-25 | 德州仪器公司 | Cascoded h-bridge pre-driver |
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2013
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104378095A (en) * | 2013-08-14 | 2015-02-25 | 德州仪器公司 | Cascoded h-bridge pre-driver |
| CN104378095B (en) * | 2013-08-14 | 2022-03-29 | 德州仪器公司 | Cascode H-bridge predriver |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140212 Termination date: 20140701 |
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| EXPY | Termination of patent right or utility model |