CN201118434Y - Dual PWM mixed cutting wave control circuit - Google Patents
Dual PWM mixed cutting wave control circuit Download PDFInfo
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- CN201118434Y CN201118434Y CNU2007201030103U CN200720103010U CN201118434Y CN 201118434 Y CN201118434 Y CN 201118434Y CN U2007201030103 U CNU2007201030103 U CN U2007201030103U CN 200720103010 U CN200720103010 U CN 200720103010U CN 201118434 Y CN201118434 Y CN 201118434Y
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- wave generator
- operational amplifier
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Abstract
A double-PWM hybrid chopper control circuit belongs to the control technical field to solve the dead-regulation problem, comprising a main PWM chopper circuit and an auxiliary PWM chopper circuit; the output ends of the two chopper circuits are connected with the IGBT grid through a NAND gate; the main PWM chopper circuit is composed of a second triangular wave generator, an operational amplifier and a clamping diode; the operational amplifier is connected with a comparator; the positive input end of the operational amplifier is connected with the second triangular wave generator, and the negative input end is connected with a regulating voltage through two serially connected resistors, and the output end is connected with the NAND gate. The auxiliary PWM chopper circuit is composed of a first triangular wave generator, an operational amplifier, a clamping diode and a NOT gate, wherein, the operational amplifier is connected with a comparator; the negative input end of the operational amplifier is connected with the first triangular wave generator, and the positive input end is connected with a regulating voltage through two serially connected resistors, and the output end is connected with the NAND gate through the NOT gate. The double-PWM hybrid chopper control circuit of the utility model has the advantages of small dead-regulation zone and good continuous regulation performance.
Description
Technical field
The utility model relates to a kind of high frequency chopping control circuit that can export the high duty ratio pulse signal, belongs to the control technology field.
Background technology
Characteristics such as cost is low, function admirable are widely used among the string utmost point speed regulating device of asynchronous motor the high frequency chopping control circuit because of having, especially in the variable speed energy saving control device of the big-and-middle-sized blower fan of industries such as electric power, mine, oil, building materials, water pump, gain great popularity especially.At present, the mode of IGBT being carried out high frequency chopping control is generally adopted in the string utmost point speed governing of asynchronous motor, because the process that turns on and off of IGBT all needs the regular hour, in the copped wave control procedure, in order to guarantee that IGBT can reliable turn-off and open-minded, the time that IGBT is in off state at every turn should be not less than a minimum duration, this minimum duration account for high frequency chopping control the pwm signal cycle about 10%, cause one of IGBT existence under the PWM copped wave control to be about 10% shutoff dead band, the adjustable range of high frequency chopping control only is about 0-90%.Therefore, existing PWM high frequency chopping control device existence is opened and is regulated the shortcoming that the dead band is big, open continuous adjusting function difference.
Summary of the invention
The utility model be used to overcome prior art defective, provide a kind of open regulate the dead band little, open the good dual PWM mixed cut wave control circuit of continuous adjusting function.
The alleged problem of the utility model realizes with following technical proposals:
A kind of dual PWM mixed cut wave control circuit, it comprises main and auxiliary two PWM chopper circuits, their output connects the grid of IGBT through a NAND gate T2, described main PWM chopper circuit is made of second triangular-wave generator, operational amplifier F2 and clamp diode D2, operational amplifier F2 is connected into comparator, its positive input connects second triangular-wave generator, negative input connects adjustable given voltage U 0 through two resistance that are connected in series, output termination NAND gate T2, the serial connection point of two resistance meets limiting voltage U2 through clamp diode D2; Described auxilliary PWM chopper circuit is made of first triangular-wave generator, operational amplifier F1, clamp diode D1 and not gate T1, operational amplifier F1 is connected into comparator, its negative input connects first triangular-wave generator, positive input connects adjustable given voltage U 0 through two resistance that are connected in series, output meets NAND gate T2 through not gate T1, and the serial connection point of two resistance meets limiting voltage U1 through clamp diode D1.
Above-mentioned dual PWM mixed cut wave control circuit, described two triangular-wave generators are made of square wave maker, first integral circuit, second integral circuit and frequency dividing circuit, the output of described square wave maker is divided into two-way, one the tunnel connects the input of second integral circuit, constitute second triangular-wave generator, the negative input of latter's output concatenation operation amplifier F2; One tunnel input through frequency dividing circuit connection first integral circuit constitutes first triangular-wave generator, the negative input of latter's output concatenation operation amplifier F1.
Above-mentioned dual PWM mixed cut wave control circuit, the limiting voltage U2 of described main PWM chopper circuit are lower than the limiting voltage U1 of auxilliary PWM chopper circuit.
Above-mentioned dual PWM mixed cut wave control circuit, the output signal of described frequency dividing circuit is 1: 100 with the ratio of the frequency of input signal.
The utility model is provided with two PWM chopper circuits that frequency is different, their output signal is controlled IGBT after a NAND gate is done logical operation, the frequency of main PWM chopper circuit is selected according to the frequency of general high-frequency PWM chopper circuit, and the upper limit dead band when it works independently is 10%.The frequency of auxilliary PWM chopper circuit is one of percentage of main PWM chopper circuit, can the dead band in cycle of 0～99% of main PWM chopper circuit is open-minded, thereby can be able to effectively enlarge and open adjustable range.It is good that the utility model is opened little, the continuous adjusting function in adjusting dead band.
Description of drawings
The utility model is described in further detail below in conjunction with accompanying drawing.
Fig. 1 is an electrical schematic diagram of the present utility model;
Fig. 2 is the theory diagram of triangular-wave generator.
Each label is among the figure: F1, F2, operational amplifier; T1, not gate; T2, NAND gate; D1, D2, clamp diode; R1～R6, resistance.
Embodiment
Referring to Fig. 1, the utility model comprises main and auxiliary two PWM chopper circuits, in auxilliary PWM chopper circuit, given adjusting input variable U0 connects the positive input of operational amplifier F1 successively through resistance R 1, resistance R 2, the anode connecting resistance R1 of limiter diode D1, the serial connection point of resistance R 2, negative electrode meets limiting voltage U1, the output of first triangular-wave generator connects the negative input of operational amplifier F1 after through a coupling resistance R3, and the output of operational amplifier F1 connects the input of NAND gate T2 behind not gate T1; In main PWM chopper circuit, adjustable given voltage U 0 connects the negative input of operational amplifier F2 successively through resistance R 4, resistance R 5, the anode connecting resistance R4 of limiter diode D2, the serial connection point of resistance R 5, negative electrode meets limiting voltage U2, the output of second triangular-wave generator connects the positive input of operational amplifier F2 after through a coupling resistance R6, the input of the output termination NAND gate T2 of operational amplifier F2, the grid of the output termination IGBT of NAND gate T2, the signal of NAND gate T2 output is PWM copped wave control signal.The difference of main and auxiliary two PWM chopper circuit pre-set parameters has 2 points: 1, the signal frequency of the triangular-wave generator in the main PWM chopper circuit is higher than the signal frequency of the triangular-wave generator in the auxilliary PWM chopper circuit, and 2, the limiting voltage U2 in the main PWM chopper circuit is lower than the limiting voltage U1 in the auxilliary PWM chopper circuit.
Table 1 is the logical relation between the variable:
Table 1
For the high frequency chopping control circuit, what pwm signal was controlled is the state that turns on and off of IGBT, when PWM=0, and the shutoff of general corresponding IGBT; Because the IGBT device is in the process of turning on and off, all there is certain intrinsic delay time, for the reliable turn-off that guarantees IGBT or open-minded, the pwm signal of control IGBT, become in 1 the process by 0 again certain minimum duration must be arranged becoming 0 by 1, what this minimum duration was PWM opens upper limit dead band.For the high frequency chopping control circuit that constitutes by single PWM, open upper limit dead band and be generally 10%, Dui Ying PWM copped wave regulating and controlling scope is 0-90% with it.At an occasion that the continuity adjusting function is had relatively high expectations, this upper limit dead band of 10% can't meet the demands.
If adopt dual PWM mixed cut wave control circuit shown in Figure 1, the output voltage U H of the output voltage U F of first triangular-wave generator and second triangular-wave generator is provided by circuit shown in Figure 2.In Fig. 2, square-wave generator produces the square-wave signal of a high frequency, and this square-wave signal one tunnel connects the second integral circuit, and the output of second integral circuit is triangular signal UH; This square-wave signal other one tunnel connects the input of 100 frequency dividing circuits, the output termination first integral circuit of 100 frequency dividing circuits, and the output of first integral circuit is triangular signal UF.Because the output signal U H of the output signal U F of first triangular-wave generator and second triangular-wave generator generates after by same square-wave signal integration, so, the zero point of UF and UH and voltage max point are synchronous (time-delay that frequency dividing circuit produces can be ignored), i.e. the voltage max point of the some periodic signals of corresponding second triangular-wave generator of the output voltage maximum of points of first triangular-wave generator.
The frequency of second triangular-wave generator is selected according to high frequency, adjusts limiting voltage U2, and making UE is that 1 upper limit dead band still is 10%, if the cycle of definition triangular-wave generator 2 is T
2, then UE is that the turn-off time Δ T of 1 upper limit dead band correspondence is: Δ T=0.1 * T
2, because the frequency of first triangular-wave generator is 1/100 of the second triangular-wave generator frequency, the cycle that even defines first triangular-wave generator is T
1, then: T
1=100 * T
2, adjust limiting voltage U1, making UC is that 0 upper limit dead band time corresponding is T
2, and make U1＞U2.Then when heightening given voltage U 0 and make it to reach limiting voltage U1, because U1＞U2, so UC and UE are in output upper limit amplitude limit dead band state, shown in table 1 logical relation, it is 1 upper limit dead band time corresponding Δ T that 0 the minimum turn-off time of then always exporting PWM and be equals UE, thus this moment the PWM correspondence shutoff dead band Δ PWM be:
Because the utility model will turn-off the dead band and be reduced to 0.1%, so the adjustable range of PWM will be extended to 0-99.9%.So the utility model can greatly reduce the restriction of opening upper limit dead band, make PWM copped wave control can satisfy the requirement of the continuous adjusting function of high accuracy, wide region.
Claims (4)
1, a kind of dual PWM mixed cut wave control circuit, it is characterized in that, it comprises the master, auxilliary two PWM chopper circuits, their output connects the grid of IGBT through a NAND gate (T2), described main PWM chopper circuit is by second triangular-wave generator, operational amplifier (F2) and clamp diode (D2) constitute, operational amplifier (F2) is connected into comparator, its positive input connects second triangular-wave generator, negative input connects regulation voltage (U0) through two resistance that are connected in series, output termination NAND gate (T2), the serial connection point of two resistance connects limiting voltage (U2) through clamp diode (D2); Described auxilliary PWM chopper circuit is made of first triangular-wave generator, operational amplifier (F1), clamp diode (D1) and not gate (T1), operational amplifier (F1) is connected into comparator, its negative input connects first triangular-wave generator, positive input connects regulation voltage (U0) through two resistance that are connected in series, output connects NAND gate (T2) through not gate (T1), and the serial connection point of two resistance connects limiting voltage (U1) through clamp diode (D1).
2, according to the described dual PWM mixed cut wave control circuit of claim 1, it is characterized in that, described two triangular-wave generators are made of square wave maker, first integral circuit, second integral circuit and frequency dividing circuit, the output of described square wave maker is divided into two-way, one the tunnel connects the input of second integral circuit, constitute second triangular-wave generator, the negative input of latter's output concatenation operation amplifier (F2); One tunnel input through frequency dividing circuit connection first integral circuit constitutes first triangular-wave generator, the negative input of latter's output concatenation operation amplifier (F1).
According to claim 1 or 2 described dual PWM mixed cut wave control circuits, it is characterized in that 3, the limiting voltage of described main PWM chopper circuit (U2) is lower than the limiting voltage (U1) of auxilliary PWM chopper circuit.
According to the described dual PWM mixed cut wave control circuit of claim 3, it is characterized in that 4, the output signal of described frequency dividing circuit is 1: 100 with the ratio of the frequency of input signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201030103U CN201118434Y (en) | 2007-11-09 | 2007-11-09 | Dual PWM mixed cutting wave control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007201030103U CN201118434Y (en) | 2007-11-09 | 2007-11-09 | Dual PWM mixed cutting wave control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201118434Y true CN201118434Y (en) | 2008-09-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNU2007201030103U Expired - Fee Related CN201118434Y (en) | 2007-11-09 | 2007-11-09 | Dual PWM mixed cutting wave control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150283B (en) * | 2007-11-09 | 2011-06-29 | 华北电力大学 | Method and circuit for dual PWM mixed cut wave control switch part |
| CN104113212A (en) * | 2013-03-15 | 2014-10-22 | 英特尔公司 | Current Balancing, Current Sensor, And Phase Balancing Apparatus And Method For A Voltage Regulator |
| WO2020211059A1 (en) * | 2019-04-18 | 2020-10-22 | 华为技术有限公司 | Multi-phase signal control circuit and method |
| CN113347746A (en) * | 2021-08-09 | 2021-09-03 | 深圳市微源半导体股份有限公司 | Heating wire drive circuit and electronic equipment |
-
2007
- 2007-11-09 CN CNU2007201030103U patent/CN201118434Y/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101150283B (en) * | 2007-11-09 | 2011-06-29 | 华北电力大学 | Method and circuit for dual PWM mixed cut wave control switch part |
| CN104113212A (en) * | 2013-03-15 | 2014-10-22 | 英特尔公司 | Current Balancing, Current Sensor, And Phase Balancing Apparatus And Method For A Voltage Regulator |
| US9733282B2 (en) | 2013-03-15 | 2017-08-15 | Intel Corporation | Current balancing, current sensor, and phase balancing apparatus and method for a voltage regulator |
| US10184961B2 (en) | 2013-03-15 | 2019-01-22 | Intel Corporation | Current balancing, current sensor, and phase balancing apparatus and method for a voltage regulator |
| US10641799B2 (en) | 2013-03-15 | 2020-05-05 | Intel Corporation | Current balancing, current sensor, and phase balancing apparatus and method for a voltage regulator |
| US11193961B2 (en) | 2013-03-15 | 2021-12-07 | Intel Corporation | Current balancing, current sensor, and phase balancing apparatus and method for a voltage regulator |
| WO2020211059A1 (en) * | 2019-04-18 | 2020-10-22 | 华为技术有限公司 | Multi-phase signal control circuit and method |
| CN113302827A (en) * | 2019-04-18 | 2021-08-24 | 华为技术有限公司 | Multiphase signal control circuit and method |
| US11558042B2 (en) | 2019-04-18 | 2023-01-17 | Huawei Technologies Co., Ltd. | Multi-phase signal control circuit and method |
| CN113302827B (en) * | 2019-04-18 | 2023-03-03 | 华为技术有限公司 | Multiphase signal control circuit and method |
| CN113347746A (en) * | 2021-08-09 | 2021-09-03 | 深圳市微源半导体股份有限公司 | Heating wire drive circuit and electronic equipment |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080917 Termination date: 20111109 |