CN105356799B - PWM driver - Google Patents

PWM driver Download PDF

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Publication number
CN105356799B
CN105356799B CN201510817480.5A CN201510817480A CN105356799B CN 105356799 B CN105356799 B CN 105356799B CN 201510817480 A CN201510817480 A CN 201510817480A CN 105356799 B CN105356799 B CN 105356799B
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voltage
resistance
module
terminal
output terminal
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CN105356799A (en
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于垂顺
潘文
姚伟
余志洋
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United Automotive Electronic Systems Co Ltd
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United Automotive Electronic Systems Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/06—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current
    • H02P7/18—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power
    • H02P7/24—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices
    • H02P7/28—Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual dc dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Dc-Dc Converters (AREA)

Abstract

The invention discloses a kind of pwm driver, reference voltage source circuit obtains branch pressure voltage Vx, Vy of load supplying voltage Vs；Circuit, which occurs, for the adaptive PWM of duty cycle includes reference input module, pwm signal generation module and voltage regulator module, reference input module introduces the first branch pressure voltage Vx or the second branch pressure voltage Vy of load supplying voltage Vs, and a control reference voltage Vref of PWM generation circuits is obtained by a voltage-stabilizing device；The magnitude of voltage of PWM output two states is respectively set to Vx and Vy by the pwm signal that the feedback voltage output certain frequency that module is exported according to control reference voltage Vref and voltage regulator module occurs for pwm signal to voltage regulator module, voltage regulator module.During the pwm driver steady operation of the present invention, it is unrelated with load supplying voltage Vs to be applied to the average voltage of load RL, can keep substantially constant, and hardware circuit is used only to realize.

Description

Pwm driver
Technical field
The present invention relates to direct current generator, more particularly to a kind of pwm driver.
Background technology
PWM (pulse width modulation) controls are widely used in direct current generator driving, and this type of drive has continuous The advantages that adjusting, be efficient.In certain applications, it is desirable to realize under supply voltage change, the average voltage of PWM driving outputs Keep substantially invariable function.For example, in vehicle fuel control, under some operating modes, it is allowed to which supply voltage is in a certain range ripple It is dynamic, but the average voltage constant of motor side is needed, so as to ensure that fuel feeding is stablized.
For PWM control direct current generator, when supply voltage change and load remain unchanged when, if can basis The change of input adjusts PWM duty cycle, keeps the average value substantially constant of output voltage, then be obtained with stable motor Electric current, so as to ensure stabilizing torque fan-out capability.At present, realize the PWM drive circuit of function above usually using microcontroller Or dedicated hardware integration chip.
For the PWM scheme of the fixation average voltage of microcontroller implementation, complicated algorithm can be used, so in control What can be done is very flexible, but there are problems with：Firstly, it is necessary to microcontroller chip, and have to control chip hardware resource Certain requirement, such as A/D and timer module are needed to have, therefore, circuit hardware cost is higher；Secondly, it is necessary to which software is opened Hair, there are corresponding input；Further, since there are the risk of software failure, in the case of reliability requirement is higher, also need extra Design circuit ensures the reliable of the output state after software failure.
For dedicated hardware integration chip solution, typically compared by hardware using output voltage as feedback with benchmark Compared with forming the closed-loop control of output voltage, such as common DC-DC switching power circuits.However, it is contemplated that closed-loop system is steady It is qualitative to analyze and confirm the stability of loop, it is necessary to each partly establish transmission function to circuit, so whole circuit design rises Come more complicated.In addition, in order to obtain stable output voltage, the output capacitance using larger capacitance, circuit are needed in circuit Cost also accordingly raise.
In automobile application, for the fuel oil Oil pump electrical machinery of unidirectional drive, microcontroller can be used, passes through PWM (Pulse Width Modulation, pulse width modulation) average value of its both end voltage is controlled to adjust so as to adjust motor speed and turn Square.The application of intelligentized microcontroller chip so that the control of Oil pump electrical machinery more will be flexible.However, since microcontroller exists It will be related to writing for software in, and with the continuous improvement of chip integration, the increasing of inner function module number More, its form to fail also increases therewith.To avoid these influences to systemic-function of failing, for some security requirements compared with High oil pump driver, it is necessary to introduce independently of microcontroller outside supervisory circuit, when monitor micro controller function exception, Active will be outputted in a system and thinks safe state, corresponding driving path can be referred to as bypass and drive Dynamic path.For PWM driving paths and driving path is bypassed, there are two kinds of structures on hardware.One kind is that one is shared on hardware Drive circuit, but this structure needs to ensure that drive circuit function after microcontroller failure keeps normal, therefore to driving electricity Road chip it is more demanding.Another hardware configuration be PWM drive circuit with bypass drive circuit on hardware it is relatively independent, point Do not realized by different drive circuits.The circuit that this structure can be directed to two paths is separately designed and optimized, but two drives The output of dynamic circuit is there are interactional risk, while devices use rate is relatively low.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of pwm driver, becomes when in the certain section of load supplying voltage During change, the PWM driving voltages of average value fixation can be obtained in load-side using only hardware circuit.
To solve above-mentioned distinguishing feature, pwm driver provided by the invention, it includes reference voltage source circuit, accounts for It is empty that circuit, power switch drive module and power switch circuit occurs than adaptive PWM；
The reference voltage source circuit, input termination load supplying voltage Vs, the first branch pressure voltage Vx of output, the second partial pressure Voltage Vy；Vx=K1Vs, Vy=K2Vs, K1Vs-K2Vs>2VZD, K1, K2 are partial pressure coefficient, VZDFor voltage of voltage regulation value；
Circuit occurs for the adaptive PWM of the duty cycle, including module and voltage occur for reference input module, pwm signal Adjust module；
Module, Vref=Vx-V occur for the reference input module, output control reference voltage Vref to pwm signalZDOr Person Vref=Vy+VZD；
Module occurs for the pwm signal, and first input end connects control reference voltage Vref, and the second input terminates the voltage Adjust the feedback voltage of module output, and the feedback electricity exported according to control reference voltage Vref and the voltage regulator module Pressure, exports the pwm signal of certain frequency to the input terminal of the voltage regulator module；
Work as Vref=Vx-VZD：Ton=P/ (Vx-VZD- Vy), Toff=P/VZD；
Work as Vref=Vy+VZD：Ton=P/VZ, Toff=P/ (Vx-VZD-Vy)；
Ton be the pwm signal high level lasting time, Toff be the pwm signal low duration, P For circuit carry-over factor；
The voltage regulator module, is adjusted to Vx, low level value is adjusted to Vy, is output to by the high value of pwm signal The power switch drive module, and it is connected to the second input terminal that module occurs for the pwm signal as feedback voltage；
The power switch drive module, drives bearing power switch connection or disconnection in the power switch circuit；
The bearing power switch and load are serially connected in load supplying voltage Vs between ground.
Preferably, module occurs for the pwm signal, including second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the One operational amplifier, the second comparator, the first capacitance；
First operational amplifier, the first input end that module occurs as pwm signal for positive input terminal connect control reference Voltage Vref, the second input terminal that module occurs as pwm signal for negative input end connect the voltage regulator module through second resistance Output terminal；
First capacitance, is connected between the negative input end and its output terminal of first operational amplifier；
The 3rd resistor, is connected on the output terminal of first operational amplifier between the second comparator positive input terminal；
4th resistance, is connected between the same second comparator negative input ends of comparison voltage Vz, Vx>Vz>Vy；
The positive input terminal of second comparator, and connect through the 5th resistance the output terminal of the voltage regulator module；
The voltage regulator module, including the 6th resistance, the 7th resistance, the first NPN triode, the second NPN triode；
6th resistance, is connected between output terminals of the load supplying voltage Vs with second comparator；
7th resistance, is connected on the output terminal of second comparator with the first NPN triode and the second PNP triode Base stage between；
First NPN triode, collector meet the first branch pressure voltage Vx；
Second PNP triode, collector meet the second branch pressure voltage Vy；
The emitter of first NPN triode connects with the emitter of the second PNP triode and is used as the voltage tune The output terminal of mould preparation block.
Preferably, the 7th resistance both ends are parallel with the second diode；
The output terminal for just terminating second comparator of second diode.
Preferably, the reference voltage source circuit, including the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd electricity Resistance, the 14th resistance, four-operational amplifier, the 5th operational amplifier；
Tenth resistance, the 11st resistance, the 12nd resistance are sequentially connected in series in load supplying voltage Vs between ground；
The four-operational amplifier, its positive input terminal are connected on concatenation point of the tenth resistance with the 11st resistance, it is negative defeated Enter end with its output terminal short circuit；
5th operational amplifier, its positive input terminal are connected on concatenation point of the 11st resistance with the 12nd resistance, it is negative Input terminal is the same as its output terminal short circuit；
13rd resistance, the 14th resistance are serially connected in the output terminal of four-operational amplifier with the defeated of the 5th operational amplifier Between outlet；
The output terminal of four-operational amplifier exports the first branch pressure voltage Vx；
The output terminal of 5th operational amplifier exports the second branch pressure voltage Vy.
Preferably, the reference voltage source circuit further includes the 6th operational amplifier；
6th operational amplifier, its positive input terminal are connected on concatenation point of the 13rd resistance with the 14th resistance, it is negative Input terminal is with its output terminal short circuit and as the output terminal of comparison voltage Vz.
Preferably, the reference input module, including first resistor, the first zener diode；
First zener diode, its negative terminal meet the first branch pressure voltage Vx, it is just terminating the pwm signal and module occurs First input end；
The first resistor, is connected on the first zener diode anode between ground；
The power switch drive module, including the 3rd comparator, the 8th resistance, the 9th resistance, the tenth resistance；
8th resistance, is connected on comparison voltage Vz between the positive input terminal of the 3rd comparator；
The negative input end of 3rd comparator, connects the output terminal of the voltage regulator module；
9th resistance, is connected on the first operating voltage VDD between the output terminal of the 3rd comparator；
Tenth resistance, is connected on the output terminal of the 3rd comparator between power switch circuit input terminal.
Preferably, the reference input module, including first resistor, the first zener diode；
First zener diode, it is just terminating the second branch pressure voltage Vy, its negative terminal connects the pwm signal and module occurs First input end；
The first resistor, is connected on the first zener diode negative terminal between load supplying voltage Vs；
The power switch drive module, including the 3rd comparator, the 8th resistance, the 9th resistance, the tenth resistance；
8th resistance, is connected on comparison voltage Vz between the negative input end of the 3rd comparator；
The positive input terminal of 3rd comparator, connects the output terminal of the voltage regulator module；
9th resistance, is connected on the first operating voltage VDD between the output terminal of the 3rd comparator；
Tenth resistance, is connected on the output terminal of the 3rd comparator between power switch circuit input terminal.
Preferably, the tenth resistance both ends are parallel with the 3rd diode；
The output terminal for just terminating the 3rd comparator of 3rd diode.
Preferably, the power switch circuit includes the 3rd NPN triode and the 4th PNP triode, the 5th switching tube；
The base stage of 3rd NPN triode and the 4th PNP triode is connected as power switch circuit input terminal；
3rd NPN triode, its collector meet the second operating voltage VDR；
4th PNP triode, its grounded collector；
The emitter same control that connects fiveth switching tube of the emitter of 3rd NPN triode with the 4th PNP triode End；
5th switching tube, its is high-end to meet load supplying voltage Vs through load, its low side ground connection；
9th resistance, it is load supplying voltage Vs to meet the first operating voltage VDD.
Preferably, the power switch circuit includes flash drive circuit, the 5th switching tube；
The flash drive circuit, for its input terminal as power switch circuit input terminal, it exports the 5th switching tube of termination Control terminal；
5th switching tube, its high termination load supplying voltage Vs, its low side is through carrying ground；
9th resistance, it is load supplying voltage Vs to meet the first operating voltage VDD.
Preferably, the power switch circuit includes half-bridge drive circuit, the 5th switching tube, the 6th switching tube；
The half-bridge drive circuit, its input terminal connect the 5th respectively as power switch circuit input terminal, its two output terminal The control terminal of switching tube, the 6th switching tube；
5th switching tube, its high termination load supplying voltage Vs, its low side is through carrying ground；
6th switching tube, its height terminate the low side of the 5th switching tube, its low side ground connection.
The pwm driver of the present invention, reference voltage source circuit obtain branch pressure voltage Vx, Vy of load supplying voltage Vs；Account for It is empty more defeated including reference input module, pwm signal generation module and voltage regulator module, reference than adaptive PWM generation circuits Enter module and introduce the first branch pressure voltage Vx or the second branch pressure voltage Vy of load supplying voltage Vs, and pass through a voltage-stabilizing device (voltage of voltage regulation value VZD, it is constant under steady operation) and obtain the control reference voltage Vref that circuit occurs for PWM；PWM believes Number occur module according to control reference voltage Vref and voltage regulator module export feedback voltage output certain frequency PWM believe Number arrive voltage regulator module.The magnitude of voltage of PWM output two states is respectively set to Vx and Vy by voltage regulator module.Stable state work When making, the average voltage on load RL is Vs*Duty=Vs* (VZD/ (Vx-Vy))=Vs* (VZD/ (K1Vs-K2Vs))= VZD*/(K1-K2), wherein Duty are pwm signal duty cycle, be applied to average voltage and the load supplying voltage Vs of load RL without Close, substantially constant can be kept.
Brief description of the drawings
In order to illustrate more clearly of technical scheme, the required attached drawing of the present invention is made below simple Introduce, it should be apparent that, drawings in the following description are only some embodiments of the present invention, for ordinary skill people For member, without creative efforts, other attached drawings can also be obtained according to these attached drawings.
Fig. 1 is the one embodiment schematic diagram of pwm driver of the present invention；
Fig. 2 is the one embodiment circuit diagram one of pwm driver of the present invention；
Fig. 3 is the one embodiment circuit diagram two of pwm driver of the present invention；
Fig. 4 is the one embodiment circuit diagram three of pwm driver of the present invention；
Fig. 5 is the one embodiment circuit diagram four of pwm driver of the present invention；
Fig. 6 is the one embodiment circuit diagram five of pwm driver of the present invention；
Fig. 7 is the one embodiment circuit diagram six of pwm driver of the present invention.
Embodiment
Below in conjunction with attached drawing, clear, complete description is carried out to the technical solution in the present invention, it is clear that described Embodiment is the part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this area is general All other embodiment that logical technical staff is obtained on the premise of creative work is not made, belongs to protection of the present invention Scope.The sequence number before mentioned device in each embodiment, does not represent each device there are sequencing, is only used for distinguishing each Device.
Embodiment one
Pwm driver, as shown in Figure 1, circuit, power occurs comprising the adaptive PWM of reference voltage source circuit, duty cycle Switch drive module and power switch circuit；
The reference voltage source circuit, input termination load supplying voltage Vs, the first branch pressure voltage Vx of output, the second partial pressure Voltage Vy；Vx=K1Vs, Vy=K2Vs, K1Vs-K2Vs>2VZD, K1, K2 are partial pressure coefficient, VZDFor voltage of voltage regulation value；
Circuit occurs for the adaptive PWM of the duty cycle, including module and voltage occur for reference input module, pwm signal Adjust module；
Module, Vref=Vx-V occur for the reference input module, output control reference voltage Vref to pwm signalZDOr Person Vref=Vy+VZD；
Module occurs for the pwm signal, and first input end connects control reference voltage Vref, and the second input terminates the voltage Adjust the feedback voltage of module output, and the feedback electricity exported according to control reference voltage Vref and the voltage regulator module Pressure, exports the pwm signal of certain frequency to the input terminal of the voltage regulator module；
Work as Vref=Vx-VZD：Ton=P/ (Vx-VZD- Vy), Toff=P/VZD；
Work as Vref=Vy+VZD：Ton=P/VZ, Toff=P/ (Vx-VZD-Vy)；
Ton be the pwm signal high level lasting time, Toff be the pwm signal low duration, P It is constant under steady operation for circuit carry-over factor；
The voltage regulator module, is adjusted to Vx, low level value is adjusted to Vy, is output to by the high value of pwm signal The power switch drive module, and it is connected to the second input terminal that module occurs for the pwm signal as feedback voltage；
The power switch drive module, drives bearing power switch connection or disconnection in the power switch circuit；
The bearing power switch and load are serially connected in load supplying voltage Vs between ground.
The pwm driver of embodiment one, reference voltage source circuit obtain branch pressure voltage Vx, Vy of load supplying voltage Vs； Circuit, which occurs, for the adaptive PWM of duty cycle includes reference input module, pwm signal generation module and voltage regulator module, reference Input module introduces the first branch pressure voltage Vx or the second branch pressure voltage Vy of load supplying voltage Vs, and passes through a voltage-stablizer Part (voltage of voltage regulation value VZD, it is constant under steady operation) and obtain the control reference voltage Vref that circuit occurs for PWM；PWM The PWM for the feedback voltage output certain frequency that signal generating module is exported according to control reference voltage Vref and voltage regulator module Signal is to voltage regulator module.The magnitude of voltage of PWM output two states is respectively set to Vx and Vy by voltage regulator module.Stable state During work, the average voltage on load RL is Vs*Duty=Vs* (VZD/ (Vx-Vy))=Vs* (VZD/ (K1Vs-K2Vs))= VZD*/(K1-K2), wherein Duty are pwm signal duty cycle, be applied to average voltage and the load supplying voltage Vs of load RL without Close, substantially constant can be kept.
The pwm driver of embodiment one, obtains what the reference voltage associated with load supplying voltage Vs was controlled as PWM Reference power supply, produces the pwm signal for stablizing concussion frequency, and the change of load supplying voltage Vs is embodied accounting for pwm signal Sky is than upper, the coupled relation of removal load supplying voltage Vs and load end average voltage, when the certain sections of load supplying voltage Vs During interior change, the PWM driving voltages of average value fixation can be obtained in load-side using only hardware circuit.
Embodiment two
Based on the pwm driver of embodiment one, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, the pwm signal occurs Module, including second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the first operational amplifier S1, the second ratio Compared with device S2, the first capacitance C1；
The first operational amplifier S1, the first input end that module occurs as pwm signal for its positive input terminal connect control Reference voltage Vref, the second input terminal that module occurs as pwm signal for its negative input end connect the voltage through second resistance R2 Adjust the output terminal of module；
The first capacitance C1, is connected between the negative input end and its output terminal of the first operational amplifier S1；
The 3rd resistor R3, is connected on the output terminal of the first operational amplifier S1 with the second comparator S2 positive input terminals Between；
The 4th resistance R4, is connected between the same second comparator S2 negative input ends of comparison voltage Vz, Vx>Vz>Vy；
The positive input terminal of the second comparator S2, and connect through the 5th resistance R5 the output terminal of the voltage regulator module；
The voltage regulator module, including the 6th resistance R6, the 7th resistance R7, the first NPN triode T1, the 2nd NPN tri- Pole pipe T2；
The 6th resistance R6, is connected between output terminals of the load supplying voltage Vs with the second comparator S2；
The 7th resistance R7, is connected on the output terminal of the second comparator S2 with the first NPN triode T1 and the 2nd PNP Between the base stage of triode T2；
The first NPN triode T1, collector meet the first branch pressure voltage Vx；
The second PNP triode T2, collector meet the second branch pressure voltage Vy；
The emitter of the first NPN triode T1 connects with the emitter of the second PNP triode T2 and is used as the electricity The output terminal of pressure adjustment module.
Preferably, the 7th resistance R7 both ends are parallel with the second diode D2, described in the positive termination of the second diode D2 The output terminal of second comparator S2.
The pwm driver of embodiment two produces certain frequency preferably, module occurs for pwm signal by RC constant current charge-discharges Pwm signal.
Embodiment three
Based on the pwm driver of embodiment one, as shown in Fig. 2, Fig. 3, Fig. 4, Fig. 5, Fig. 6, Fig. 7, the reference voltage source Circuit, including the tenth resistance R10, the 11st resistance R11, the 12nd resistance R12, the 13rd resistance R13, the 14th resistance R14, Four-operational amplifier S4, the 5th operational amplifier S5；
Tenth resistance R10, the 11st resistance R11, the 12nd resistance R12 are sequentially connected in series in load supplying voltage Vs with ground Between；
The four-operational amplifier S4, its positive input terminal are connected on concatenations of the tenth resistance R10 with the 11st resistance R11 Point, its negative input end is the same as its output terminal short circuit；
The 5th operational amplifier S5, its positive input terminal are connected on concatenations of the 11st resistance R11 with the 12nd resistance R12 Point, its negative input end is the same as its output terminal short circuit；
The output terminal that 13rd resistance R13, the 14th resistance R13 are serially connected in four-operational amplifier S4 is put with the 5th computing Between the output terminal of big device S5；
The output terminal of four-operational amplifier S4 exports the first branch pressure voltage Vx；
The output terminal of 5th operational amplifier S5 exports the second branch pressure voltage Vy.
Preferably, the reference voltage source circuit further includes the 6th operational amplifier S6；
6th operational amplifier S6, its positive input terminal are connected on concatenation points of the 13rd resistance R13 with the 14th resistance R13, Its negative input end is with its output terminal short circuit and as the output terminal of comparison voltage Vz.
The pwm driver of embodiment three, reference voltage source circuit obtain the of load supplying voltage Vs by potential-divider network One branch pressure voltage Vx, the second branch pressure voltage Vy.
Example IV
Based on the pwm driver of embodiment one, as shown in Fig. 2, Fig. 4, Fig. 6, the reference input module, including the first electricity Hinder R1, the first zener diode D1；
The first zener diode D1, its negative terminal meet the first branch pressure voltage Vx, it is just terminating the pwm signal and mould occurs The first input end of block；
The first resistor R1, is connected on the first zener diode D1 anodes between ground；
The power switch drive module, including the 3rd comparator S3, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10；
The 8th resistance R8, is connected on comparison voltage Vz between the positive input terminal of the 3rd comparator S3；
The negative input end of the 3rd comparator S3, connects the output terminal of the voltage regulator module；
The 9th resistance R9, is connected on the first operating voltage VDD between the output terminal of the 3rd comparator S3；
The tenth resistance R10, is connected on the output terminal of the 3rd comparator S3 between power switch circuit input terminal.
Preferably, the tenth resistance R10 both ends are parallel with the 3rd diode D3, described in the positive termination of the 3rd diode D3 The output terminal of 3rd comparator S3.
First zener diode D1 can be changed to other voltage-stabilizing devices, such as voltage reference source chip.
The pwm driver of example IV, reference input module occur module for pwm signal and provide control reference voltage Vref, Vref=Vx-VZD；VZDFor the voltage of voltage regulation value of the first zener diode D1；During steady operation, the high level of pwm signal Duration is Ton=P1/ (Vref-Vy)=P1/ (Vx-VZD- Vy), low duration Toff=P1/VZD, negative The average voltage carried on RL is Vs*Duty=Vs* (VZD/ (Vx-Vy))=Vs* (VZD/ (K1Vs-K2Vs))=VZD*/(K1- K2), wherein Duty is pwm signal duty cycle.As it can be seen that during pwm driver steady operation, be applied to the average voltage of load RL with Load supplying voltage Vs is unrelated, can keep substantially constant.
Embodiment five
Based on the pwm driver of embodiment one, as shown in Fig. 3, Fig. 5, Fig. 7, the reference input module, including the first electricity Hinder R1, the first zener diode D1；
The first zener diode D1, it is just terminating the second branch pressure voltage Vy, its negative terminal connects the pwm signal and mould occurs The first input end of block；
The first resistor R1, is connected on the first zener diode D1 negative terminals between load supplying voltage Vs；
The power switch drive module, including the 3rd comparator S3, the 8th resistance R8, the 9th resistance R9, the tenth resistance R10；
The 8th resistance R8, is connected on comparison voltage Vz between the negative input end of the 3rd comparator S3；
The positive input terminal of the 3rd comparator S3, connects the output terminal of the voltage regulator module；
The 9th resistance R9, is connected on the first operating voltage VDD between the output terminal of the 3rd comparator S3；
The tenth resistance R10, is connected on the output terminal of the 3rd comparator S3 between power switch circuit input terminal.
Preferably, the tenth resistance R10 both ends are parallel with the 3rd diode D3, described in the positive termination of the 3rd diode D3 The output terminal of 3rd comparator S3.
First zener diode D1 can be changed to other voltage-stabilizing devices, such as voltage reference source chip.
The pwm driver of embodiment five, reference input module occur module for pwm signal and provide control reference voltage Vref, Vref=Vy+VZD；VZDFor the voltage of voltage regulation value of the first zener diode D1；During steady operation, the low level of pwm signal Duration is Toff=P1/ (Vx-Vref)=P1/ (Vx-Vy-VZD), high level lasting time Ton=P1/VZD, negative The average voltage carried on RL is Vs*Duty=Vs* (VZD/ (Vx-Vy))=Vs* (VZD/ (K1Vs-K2Vs))=VZD*/(K1- K2), wherein Duty is pwm signal duty cycle.As it can be seen that during pwm driver steady operation, be applied to the average voltage of load RL with Load supplying voltage Vs is unrelated, can keep substantially constant.
Embodiment six
Pwm driver based on example IV or five, as shown in Figure 2 and Figure 3, the power switch circuit include the 3rd NPN Triode T3 and the 4th PNP triode T4, the 5th switch transistor T 5；
The base stage of the 3rd NPN triode T3 and the 4th PNP triode T4 is connected as power switch circuit input terminal；
The 3rd NPN triode T3, its collector meet the second operating voltage VDR；
The 4th PNP triode T4, its grounded collector；
The emitter of the same 4th PNP triode T4 of the emitter of the 3rd NPN triode T3 is same to connect the 5th switch transistor T 5 Control terminal；
5th switch transistor T 5, its is high-end to meet load supplying voltage Vs through loading RL, its low side ground connection；
The 9th resistance R9, it is load supplying voltage Vs to meet operating voltage VDD.
Embodiment seven
Pwm driver based on example IV or five, as shown in Figure 4, Figure 5, the power switch circuit drive including flash Dynamic circuit, the 5th switch transistor T 5；
The flash drive circuit, for its input terminal as power switch circuit input terminal, it exports the 5th switching tube of termination The control terminal of T5；
5th switch transistor T 5, its high termination load supplying voltage Vs, its low side are grounded through loading RL；
The 9th resistance R9, it is load supplying voltage Vs to meet operating voltage VDD.
Embodiment eight
Pwm driver based on example IV or five, as shown in Figure 6, Figure 7, the power switch circuit drive including half-bridge Dynamic circuit, the 5th switch transistor T 5, the 6th switch transistor T 6；
The half-bridge drive circuit, its input terminal connect the 5th respectively as power switch circuit input terminal, its two output terminal The control terminal of switch transistor T 5, the 6th switch transistor T 6；
5th switch transistor T 5, its high termination load supplying voltage Vs, its low side are grounded through loading RL；
6th switch transistor T 6, its height terminate the low side of the 5th switch transistor T 5, its low side ground connection.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention God and any modification, equivalent substitution, improvement and etc. within principle, done, should be included within the scope of protection of the invention.

Claims (11)

  1. A kind of 1. pwm driver, it is characterised in that comprising the adaptive PWM of reference voltage source circuit, duty cycle occur circuit, Power switch drive module and power switch circuit；
    The reference voltage source circuit, input termination load supplying voltage Vs, the first branch pressure voltage Vx of output, the second branch pressure voltage Vy；Vx=K1Vs, Vy=K2Vs, K1Vs-K2Vs>2VZD, K1, K2 are partial pressure coefficient, VZDFor voltage of voltage regulation value；
    Circuit occurs for the adaptive PWM of the duty cycle, including module and voltage adjustment occur for reference input module, pwm signal Module；
    Module, Vref=Vx-V occur for the reference input module, output control reference voltage Vref to pwm signalZDOr Vref=Vy+VZD；
    Module occurs for the pwm signal, and first input end connects control reference voltage Vref, and the second input terminates the voltage adjustment The feedback voltage of module output, and the feedback voltage exported according to control reference voltage Vref and the voltage regulator module, it is defeated Go out the pwm signal of certain frequency to the input terminal of the voltage regulator module；
    Work as Vref=Vx-VZD：Ton=P/ (Vx-VZD- Vy), Toff=P/VZD；
    Work as Vref=Vy+VZD：Ton=P/VZ, Toff=P/ (Vx-VZD-Vy)；
    Ton is the high level lasting time of the pwm signal, and Toff is the low duration of the pwm signal, and P is electricity Road carry-over factor；
    The voltage regulator module, Vx is adjusted to by the high value of pwm signal, and low level value is adjusted to Vy, is output to described Power switch drive module, and it is connected to the second input terminal that module occurs for the pwm signal as feedback voltage；
    The power switch drive module, drives bearing power switch connection or disconnection in the power switch circuit；
    The bearing power switch and load are serially connected in load supplying voltage Vs between ground.
  2. 2. pwm driver according to claim 1, it is characterised in that
    Module, including second resistance, 3rd resistor, the 4th resistance, the 5th resistance, the first operation amplifier occur for the pwm signal Device, the second comparator, the first capacitance；
    First operational amplifier, the first input end that module occurs as pwm signal for positive input terminal connect control reference voltage Vref, the second input terminal that module occurs as pwm signal for negative input end connect the defeated of the voltage regulator module through second resistance Outlet；
    First capacitance, is connected between the negative input end and its output terminal of first operational amplifier；
    The 3rd resistor, is connected on the output terminal of first operational amplifier between the second comparator positive input terminal；
    4th resistance, is connected between the same second comparator negative input ends of comparison voltage Vz, Vx>Vz>Vy；
    The positive input terminal of second comparator, and connect through the 5th resistance the output terminal of the voltage regulator module；
    The voltage regulator module, including the 6th resistance, the 7th resistance, the first NPN triode, the second NPN triode；
    6th resistance, is connected between output terminals of the load supplying voltage Vs with second comparator；
    7th resistance, is connected on base of the output terminal with the first NPN triode and the second PNP triode of second comparator Between pole；
    First NPN triode, collector meet the first branch pressure voltage Vx；
    Second PNP triode, collector meet the second branch pressure voltage Vy；
    The emitter of first NPN triode connects with the emitter of the second PNP triode and is used as the voltage to adjust mould The output terminal of block.
  3. 3. pwm driver according to claim 2, it is characterised in that
    The 7th resistance both ends are parallel with the second diode；
    The output terminal for just terminating second comparator of second diode.
  4. 4. pwm driver according to claim 1, it is characterised in that
    The reference voltage source circuit, including the tenth resistance, the 11st resistance, the 12nd resistance, the 13rd resistance, the 14th electricity Resistance, four-operational amplifier, the 5th operational amplifier；
    Tenth resistance, the 11st resistance, the 12nd resistance are sequentially connected in series in load supplying voltage Vs between ground；
    The four-operational amplifier, its positive input terminal are connected on concatenation point of the tenth resistance with the 11st resistance, its negative input end With its output terminal short circuit；
    5th operational amplifier, its positive input terminal are connected on concatenation point of the 11st resistance with the 12nd resistance, its negative input End is the same as its output terminal short circuit；
    13rd resistance, the 14th resistance are serially connected in output terminal of the output terminal with the 5th operational amplifier of four-operational amplifier Between；
    The output terminal of four-operational amplifier exports the first branch pressure voltage Vx；
    The output terminal of 5th operational amplifier exports the second branch pressure voltage Vy.
  5. 5. pwm driver according to claim 4, it is characterised in that
    The reference voltage source circuit further includes the 6th operational amplifier；
    6th operational amplifier, its positive input terminal are connected on concatenation point of the 13rd resistance with the 14th resistance, its negative input End is with its output terminal short circuit and as the output terminal of comparison voltage Vz.
  6. 6. pwm driver according to claim 1, it is characterised in that
    The reference input module, including first resistor, the first zener diode；
    First zener diode, its negative terminal meet the first branch pressure voltage Vx, it is just terminating module occurs for the pwm signal the One input terminal；
    The first resistor, is connected on the first zener diode anode between ground；
    The power switch drive module, including the 3rd comparator, the 8th resistance, the 9th resistance, the tenth resistance；
    8th resistance, is connected on comparison voltage Vz between the positive input terminal of the 3rd comparator；
    The negative input end of 3rd comparator, connects the output terminal of the voltage regulator module；
    9th resistance, is connected on the first operating voltage VDD between the output terminal of the 3rd comparator；
    Tenth resistance, is connected on the output terminal of the 3rd comparator between power switch circuit input terminal.
  7. 7. pwm driver according to claim 1, it is characterised in that
    The reference input module, including first resistor, the first zener diode；
    First zener diode, it is just terminating the second branch pressure voltage Vy, its negative terminal connects module occurs for the pwm signal the One input terminal；
    The first resistor, is connected on the first zener diode negative terminal between load supplying voltage Vs；
    The power switch drive module, including the 3rd comparator, the 8th resistance, the 9th resistance, the tenth resistance；
    8th resistance, is connected on comparison voltage Vz between the negative input end of the 3rd comparator；
    The positive input terminal of 3rd comparator, connects the output terminal of the voltage regulator module；
    9th resistance, is connected on the first operating voltage VDD between the output terminal of the 3rd comparator；
    Tenth resistance, is connected on the output terminal of the 3rd comparator between power switch circuit input terminal.
  8. 8. the pwm driver according to claim 6 or 7, it is characterised in that
    The tenth resistance both ends are parallel with the 3rd diode；
    The output terminal for just terminating the 3rd comparator of 3rd diode.
  9. 9. the pwm driver according to claim 6 or 7, it is characterised in that
    The power switch circuit includes the 3rd NPN triode and the 4th PNP triode, the 5th switching tube；
    Switching tube includes an electric current and flows into end, an electric current outflow end and a control terminal；
    The voltage control electric current of the control terminal of switching tube flows into end and is switched on or switched off with electric current outflow end；
    The base stage of 3rd NPN triode and the 4th PNP triode is connected as power switch circuit input terminal；
    3rd NPN triode, its collector meet the second operating voltage VDR；
    4th PNP triode, its grounded collector；
    The emitter same control terminal that connects fiveth switching tube of the emitter of 3rd NPN triode with the 4th PNP triode；
    5th switching tube, its electric current flow into end and meet load supplying voltage Vs through load, its electric current outflow end ground connection；
    9th resistance, it is load supplying voltage Vs to meet the first operating voltage VDD.
  10. 10. the pwm driver according to claim 6 or 7, it is characterised in that
    The power switch circuit includes flash drive circuit, the 5th switching tube；
    Switching tube includes an electric current and flows into end, an electric current outflow end and a control terminal；
    The voltage control electric current of the control terminal of switching tube flows into end and is switched on or switched off with electric current outflow end；
    The flash drive circuit, for its input terminal as power switch circuit input terminal, it exports the control of the 5th switching tube of termination End processed；
    5th switching tube, its electric current flow into terminating load supply voltage Vs, its electric current outflow end is through carrying ground；
    9th resistance, it is load supplying voltage Vs to meet the first operating voltage VDD.
  11. 11. the pwm driver according to claim 6 or 7, it is characterised in that
    The power switch circuit includes half-bridge drive circuit, the 5th switching tube, the 6th switching tube；
    Switching tube includes an electric current and flows into end, an electric current outflow end and a control terminal；
    The voltage control electric current of the control terminal of switching tube flows into end and is switched on or switched off with electric current outflow end；
    The half-bridge drive circuit, for its input terminal as power switch circuit input terminal, its two output terminal connects the 5th switch respectively Pipe, the control terminal of the 6th switching tube；
    5th switching tube, its electric current flow into terminating load supply voltage Vs, its electric current outflow end is through carrying ground；
    6th switching tube, its electric current flow into the electric current outflow end for terminating the 5th switching tube, its electric current outflow end ground connection.
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CN108462417A (en) * 2018-03-02 2018-08-28 无锡矽瑞微电子股份有限公司 Motor-drive circuit

Citations (3)

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Publication number Priority date Publication date Assignee Title
CN101262197A (en) * 2007-03-06 2008-09-10 罗姆股份有限公司 Motor drive device and electric apparatus using the same
CN102684499A (en) * 2011-03-08 2012-09-19 登丰微电子股份有限公司 Full-bridge conversion circuit and full-bridge drive control circuit
CN205283443U (en) * 2015-11-23 2016-06-01 联合汽车电子有限公司 PWM driver

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Publication number Priority date Publication date Assignee Title
JP4732106B2 (en) * 2005-09-30 2011-07-27 ルネサスエレクトロニクス株式会社 Motor control device and motor control method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101262197A (en) * 2007-03-06 2008-09-10 罗姆股份有限公司 Motor drive device and electric apparatus using the same
CN102684499A (en) * 2011-03-08 2012-09-19 登丰微电子股份有限公司 Full-bridge conversion circuit and full-bridge drive control circuit
CN205283443U (en) * 2015-11-23 2016-06-01 联合汽车电子有限公司 PWM driver

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