CN210327382U - Elevator band-type brake power supply - Google Patents
Elevator band-type brake power supply Download PDFInfo
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- CN210327382U CN210327382U CN201921517962.9U CN201921517962U CN210327382U CN 210327382 U CN210327382 U CN 210327382U CN 201921517962 U CN201921517962 U CN 201921517962U CN 210327382 U CN210327382 U CN 210327382U
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- 238000005070 sampling Methods 0.000 claims abstract description 54
- 239000003990 capacitor Substances 0.000 claims description 36
- 230000005669 field effect Effects 0.000 claims description 10
- 229910044991 metal oxide Inorganic materials 0.000 claims description 10
- 150000004706 metal oxides Chemical class 0.000 claims description 10
- 239000004065 semiconductor Substances 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 101710170230 Antimicrobial peptide 1 Proteins 0.000 description 7
- 101710170231 Antimicrobial peptide 2 Proteins 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The embodiment of the utility model discloses elevator band-type brake power supply, including the main power circuit, the main power circuit includes control chip, the switch tube, an input for connecting DC power supply, an output for connecting band-type brake coil, and positive direct current bus and negative direct current bus of connection between input and output, the switch tube is connected in series on the negative direct current bus, and elevator band-type brake power supply still includes voltage sampling module, voltage sampling module's input is connected to positive direct current bus and negative direct current bus, and obtain the output voltage of main power circuit according to the voltage difference of positive direct current bus and negative direct current bus; the first pin of the control chip is connected with the output end of the voltage sampling module, the second pin is connected with the control end of the switch tube, and the control chip adjusts the pulse width of a pulse width modulation signal output by the second pin according to the input voltage of the first pin so as to reduce the driving cost of the switch tube.
Description
Technical Field
The utility model relates to an elevator technical field especially relates to an elevator band-type brake power.
Background
Along with the development of economy, the urbanization process is higher and higher, and an elevator becomes an indispensable matching device for high-rise buildings in cities. The elevator needs a band-type brake device, which mainly plays a braking role: (1) the elevator is prevented from falling; (2) prevent the elevator from sliding and prevent the elevator car and the floor from being misplaced. The contracting brake power supply is used as a power supply of a contracting brake coil, the performance of the contracting brake is directly influenced by the quality of the performance of the contracting brake power supply, and the elevator riding experience is further influenced. The conventional common schemes of the band-type brake power supply comprise a thyristor rectification scheme and a switch power supply scheme, and in the switch power supply scheme, the BUCK power supply is considered to be the preferred scheme of the band-type brake power supply because the BUCK power supply has the advantages of simple structure, few devices, low cost, stable output, high precision and no noise during working. However, since the MOS transistor in the BUCK power supply is located at a high end, the driving cost is high, and the addition of a control current loop is complicated, which restricts the cost reduction and the control simplification.
SUMMERY OF THE UTILITY MODEL
The embodiment of the utility model provides a problem to the drive cost height of the MOS pipe in the above-mentioned BUCK power provides an elevator band-type brake power.
The embodiment of the utility model provides a solve above-mentioned technical problem's technical scheme is, provide an elevator band-type brake power supply, including the main power circuit, the main power circuit includes control chip, switch tube, is used for connecting DC power supply's input interface, is used for connecting the output interface of band-type brake coil and connects positive direct current bus and burden direct current bus between input interface and the output interface, the switch tube is connected in series on the burden direct current bus, and the elevator band-type brake power supply still includes voltage sampling module, voltage sampling module's input is connected to positive direct current bus and burden direct current bus, and confirm the output voltage of main power circuit according to the voltage difference of positive direct current bus and burden direct current bus; the first pin of the control chip is connected with the output end of the voltage sampling module, the second pin is connected with the control end of the switch tube, and the control chip adjusts the pulse width of a pulse width modulation signal output by the second pin according to the input voltage of the first pin.
Preferably, the elevator band-type brake power supply further comprises a current sampling unit for sampling current flowing through the switching tube, an output end of the current sampling unit is connected to a third pin of the control chip, and the control chip adjusts a pulse width of a pulse width modulation signal output by the second pin according to the input voltage of the first pin and the input voltage of the third pin.
Preferably, the second pin of the control chip outputs a high level when the input voltage of the third pin is increased from zero to the input voltage of the first pin, and the second pin of the control chip outputs a low level when the input voltage of the third pin is zero.
Preferably, the current sampling unit includes a first resistor, a second resistor, and a first capacitor, the first resistor is connected between a negative electrode of the input interface of the dc power supply and the switching tube, and the second resistor and the first capacitor are sequentially connected in series between a connection point of the first resistor and the switching tube and a reference ground; and a third pin of the control chip is connected to a connection point of the second resistor and the first capacitor.
Preferably, the elevator band-type brake power supply comprises: the frequency adjusting unit is used for determining the frequency of the pulse width modulation signal and comprises a third resistor and a second capacitor, wherein the third resistor and the second capacitor are connected between a fourth pin of the control chip and a reference ground in series.
Preferably, the voltage sampling module includes a differential sampling unit and a voltage feedback unit, an input end of the differential sampling unit is connected to the positive dc bus and the negative dc bus, an output end of the differential sampling unit is connected to a first input end of the voltage feedback unit, and differentially samples a dc bus voltage of the main power circuit; the second input end of the voltage feedback unit is connected with a reference voltage, the output end of the voltage feedback unit is connected with the first pin of the control chip, and the voltage obtained by differential amplification sampling is amplified according to the reference voltage.
Preferably, the differential sampling unit includes a first operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor, and a non-inverting input terminal of the first operational amplifier is connected to the positive dc bus of the main power circuit through the fourth resistor, an inverting input terminal of the first operational amplifier is connected to the negative dc bus of the main power circuit through the fifth resistor, the inverting input terminal of the first operational amplifier is connected to an output terminal of the first operational amplifier through the sixth resistor, the non-inverting input terminal of the first operational amplifier is grounded through the seventh resistor, and the output terminal of the first operational amplifier is connected to the first input terminal of the voltage feedback unit.
Preferably, the voltage feedback unit includes a second operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor and a fourth capacitor, and a non-inverting input terminal of the second operational amplifier is connected to the reference voltage, an inverting input terminal of the second operational amplifier is connected to an output terminal of the differential sampling unit through the eighth resistor, an output terminal of the second operational amplifier is connected to the first pin of the control chip through the ninth resistor, one end of the third capacitor is connected to the output terminal of the second operational amplifier, the other end of the third capacitor is connected to one end of the tenth resistor, and the other end of the tenth resistor is connected to the inverting input terminal of the second operational amplifier; the fourth capacitor is connected in parallel between one end of the third capacitor and the other end of the tenth resistor.
Preferably, the switch tube is an N-channel metal oxide semiconductor field effect transistor, a gate of the N-channel metal oxide semiconductor field effect transistor is connected with a negative electrode of the input interface of the main power circuit, a drain of the N-channel metal oxide semiconductor field effect transistor is connected with a negative electrode of the output end of the main power circuit, and a source of the N-channel metal oxide semiconductor field effect transistor is connected with the second pin of the control chip.
In the elevator band-type brake power supply provided by the embodiment, the switch tube is arranged at the low end (negative electrode) and is combined with the voltage control loop, so that the output voltage of the main power circuit is subjected to differential sampling and is sent to the voltage control loop, and meanwhile, the voltage output to the main power circuit can be adjusted by adjusting the accessed reference voltage of the voltage control module so as to adapt to different band-type brakes, and the driving control is simple. In addition, the circuit has a simple structure, an additional driving circuit is not needed, the driving cost of the MOS tube is reduced, and meanwhile, due to the fact that the output voltage is adjustable, the dynamic performance is good due to the fact that double-loop control of a voltage control module and a current loop (namely a current sampling unit) is adopted.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an elevator band-type brake power supply according to an embodiment of the present invention;
fig. 2 is a circuit diagram of an elevator band-type brake power supply according to an embodiment of the present invention;
fig. 3 is a graph of an input signal and an output signal of a control chip of an elevator band-type brake power supply according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, of the embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In order to reduce the driving cost of the band-type brake power of traditional elevator, simplify the control of band-type brake power, the embodiment of the utility model provides an elevator band-type brake power.
Fig. 1 is a circuit diagram of an elevator brake power supply provided by the utility model, the elevator brake power supply comprises a main power circuit 1, the main power circuit comprises a control chip U, a switch tube Q, an input interface for connecting a direct current power supply, an output interface for connecting a brake coil, and a positive direct current bus and a negative direct current bus connected between the input interface and the output interface, the switch tube Q is connected in series on the negative direct current bus, and the elevator brake power supply further comprises a voltage sampling module 2, an input end of the voltage sampling module 2 is connected to the positive direct current bus and the negative direct current bus, and an output voltage of the main power circuit 1 is determined according to a voltage difference between the positive direct current bus and the negative direct current bus; a first pin (e.g., a compensation pin) of the control chip U is connected to an output terminal of the voltage sampling module 2, a second pin (e.g., an output pin) is connected to a control terminal of the switching tube Q, and the control chip U adjusts a pulse width of a pulse width modulation signal output from the second pin according to an input voltage of the first pin.
According to the elevator band-type brake power supply, the switch tube Q is arranged at the low end (on the negative direct current bus), and the voltage sampling module 2 is adopted to sample and amplify the output voltage of the main power circuit 1 so as to drive the switch tube Q. The voltage sampling module 2 can amplify the sampling voltage, so that the voltage sampling module is adaptive to different brake coils, and the driving control is simple. In addition, the circuit is simple in structure, an additional driving circuit is not needed, and the driving cost of the MOS tube is reduced.
The elevator brake power supply further comprises a current sampling unit 11, the current sampling unit 11 is used for sampling current flowing through the switching tube Q, an output end of the current sampling unit 11 is connected to a third pin (for example, an overcurrent protection detection pin) of the control chip U, and the control chip U can adjust the pulse width of a pulse width modulation signal output by the second pin according to the input voltage of the first pin and the input voltage of the third pin.
Specifically, as shown in fig. 3, the second pin of the control chip U outputs a high level when the input voltage of the third pin is increased from zero to the input voltage of the first pin, and the second pin of the control chip U outputs a low level when the input voltage of the third pin is zero. In fig. 3, the lowermost part is a schematic diagram of the period (frequency) of the pulse width modulation signal.
The voltage sampling module 2 comprises a differential sampling unit 21 and a voltage feedback unit 22, wherein the input end of the differential sampling unit 21 is connected to a positive direct-current bus and a negative direct-current bus, the output end of the differential sampling unit 21 is connected with the first input end of the voltage feedback unit 22, and differential sampling is carried out on the direct-current bus voltage of the main power circuit 1; a second input end of the voltage feedback unit 22 is connected to the reference voltage Vref, and an output end of the voltage feedback unit 22 is connected to the first pin of the control chip U, and amplifies the voltage obtained by differential amplification sampling according to the reference voltage Vref. The voltage feedback unit 22 may adjust the voltage output by the differential sampling unit 21 by adjusting the reference voltage Vref, so as to adjust the pulse width of the pulse width modulation signal output by the second pin of the control chip U, so as to adapt to different internal contracting brake coils.
Specifically, the differential sampling unit 21 includes a first operational amplifier AMP1, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7, and a non-inverting input terminal of the first operational amplifier AMP1 is connected to the positive dc bus of the main power circuit 1 through the fourth resistor R4, an inverting input terminal of the first operational amplifier AMP1 is connected to the negative dc bus of the main power circuit 1 through the fifth resistor R5, an inverting input terminal of the first operational amplifier AMP1 is connected to an output terminal of the first operational amplifier AMP1 through the sixth resistor R6, a non-inverting input terminal of the first operational amplifier AMP1 is grounded through the seventh resistor R7, and an output terminal of the first operational amplifier AMP1 is connected to the first input terminal of the voltage feedback unit 22.
Specifically, the voltage feedback unit 22 includes a second operational amplifier AMP2, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a third capacitor C3 and a fourth capacitor C4, a non-inverting input terminal of the second operational amplifier AMP2 is connected to the reference voltage Vref, an inverting input terminal of the second operational amplifier AMP2 is connected to an output terminal of the differential sampling unit 21 through the eighth resistor, an output terminal of the second operational amplifier AMP2 is connected to the first pin of the control chip U through the ninth resistor R9, one end of the third capacitor C3 is connected to the output terminal of the second operational amplifier 2, the other end of the third capacitor AMP is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the inverting input terminal of the second operational amplifier AMP 2; the fourth capacitor C4 is connected in parallel between one end of the third capacitor C3 and the other end of the tenth resistor R10.
In addition, in order to enhance the dynamic performance of the elevator brake power supply, the current sampling unit 11 includes a first resistor R1, a second resistor R2 and a first capacitor C1, the first resistor R1 is connected between the negative electrode of the input interface of the dc power supply and the switching tube Q, the second resistor R2 and the first capacitor C1 are sequentially connected in series between the connection point of the first resistor R1 and the switching tube Q and the reference ground, and the third pin of the control chip U is connected to the connection point of the second resistor R2 and the first capacitor C1.
In another embodiment of the present invention, the elevator brake power supply comprises a frequency adjustment unit 12, and the frequency adjustment unit 12 is configured to determine the frequency of the pulse width modulation signal. Specifically, the frequency adjustment unit 12 includes a third resistor R3 and a second capacitor C2, wherein the third resistor R3 and the second capacitor C2 are connected in series between a fourth pin (e.g., a reference voltage input pin) of the control chip U and a reference ground. By changing the resistance of the third resistor R3 and the capacitance of the second capacitor C2, the frequency of the pwm signal output from the control chip U can be adjusted.
Additionally, the embodiment of the utility model provides an in the switching tube Q that adopts can be N channel metal oxide semiconductor field effect transistor, NMOS pipe promptly, and N channel metal oxide semiconductor field effect transistor's grid is connected with the negative pole of main power circuit 1's input interface, and the drain electrode is connected with the negative pole of main power circuit 1's output, and the source electrode is connected with control chip U's second pin.
Optionally, in the embodiment of the present invention, the main power circuit 1 may further include a diode D, a filter inductor L, and a filter capacitor Co, and a cathode of the diode D is connected to an anode of the output terminal, and an anode of the diode D is connected to a cathode of the output terminal; one end of the filter inductor L is connected with the switching tube Q, and the other end of the filter inductor L is connected with the negative electrode of the output end; the filter capacitor Co is connected between the positive electrode and the negative electrode of the output terminal.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (9)
1. An elevator band-type brake power supply comprises a main power circuit, wherein the main power circuit comprises a control chip, a switch tube, an input interface used for connecting a direct current power supply, an output interface used for connecting a band-type brake coil, and a positive direct current bus and a negative direct current bus which are connected between the input interface and the output interface; the first pin of the control chip is connected with the output end of the voltage sampling module, the second pin is connected with the control end of the switch tube, and the control chip adjusts the pulse width of the pulse width modulation signal output by the second pin according to the input voltage of the first pin.
2. The elevator brake power supply according to claim 1, further comprising a current sampling unit for sampling a current flowing through the switching tube, wherein an output end of the current sampling unit is connected to a third pin of the control chip, and the control chip adjusts a pulse width of the pulse width modulation signal output from the second pin according to an input voltage of the first pin and an input voltage of the third pin.
3. The elevator brake power supply of claim 2, wherein the second pin of the control chip outputs a high level when the input voltage of the third pin increases from zero to the input voltage of the first pin, and the second pin of the control chip outputs a low level when the input voltage of the third pin is zero.
4. The elevator brake power supply according to claim 2, wherein the current sampling unit comprises a first resistor, a second resistor and a first capacitor, the first resistor is connected between the negative electrode of the input interface of the direct current power supply and the switching tube, and the second resistor and the first capacitor are sequentially connected in series between the connection point of the first resistor and the switching tube and a reference ground; and a third pin of the control chip is connected to a connection point of the second resistor and the first capacitor.
5. The elevator brake power supply of claim 2, wherein the elevator brake power supply comprises: the frequency adjusting unit is used for determining the frequency of the pulse width modulation signal and comprises a third resistor and a second capacitor, wherein the third resistor and the second capacitor are connected between a fourth pin of the control chip and a reference ground in series.
6. The elevator brake power supply according to claim 2, wherein the voltage sampling module comprises a differential sampling unit and a voltage feedback unit, wherein an input end of the differential sampling unit is connected to the positive direct current bus and the negative direct current bus, an output end of the differential sampling unit is connected with a first input end of the voltage feedback unit, and the differential sampling unit is used for differentially sampling the direct current bus voltage of the main power circuit; the second input end of the voltage feedback unit is connected with a reference voltage, the output end of the voltage feedback unit is connected with the first pin of the control chip, and the voltage obtained by differential amplification sampling is amplified according to the reference voltage.
7. The elevator brake power supply according to claim 6, wherein the differential sampling unit comprises a first operational amplifier, a fourth resistor, a fifth resistor, a sixth resistor and a seventh resistor, and a non-inverting input terminal of the first operational amplifier is connected to the positive dc bus of the main power circuit through the fourth resistor, an inverting input terminal of the first operational amplifier is connected to the negative dc bus of the main power circuit through the fifth resistor, an inverting input terminal of the first operational amplifier is connected to an output terminal of the first operational amplifier through the sixth resistor, the non-inverting input terminal of the first operational amplifier is grounded through the seventh resistor, and an output terminal of the first operational amplifier is connected to the first input terminal of the voltage feedback unit.
8. The elevator brake power supply according to claim 6, wherein the voltage feedback unit comprises a second operational amplifier, an eighth resistor, a ninth resistor, a tenth resistor, a third capacitor and a fourth capacitor, a non-inverting input terminal of the second operational amplifier is connected to a reference voltage, an inverting input terminal of the second operational amplifier is connected to the output terminal of the differential sampling unit through the eighth resistor, the output terminal of the second operational amplifier is connected to the first pin of the control chip through the ninth resistor, one end of the third capacitor is connected to the output terminal of the second operational amplifier, the other end of the third capacitor is connected to one end of the tenth resistor, and the other end of the tenth resistor is connected to the inverting input terminal of the second operational amplifier; the fourth capacitor is connected in parallel between one end of the third capacitor and the other end of the tenth resistor.
9. The elevator brake power supply according to any one of claims 1-8, wherein the switch tube is an N-channel metal oxide semiconductor field effect transistor, and a gate of the N-channel metal oxide semiconductor field effect transistor is connected to a negative pole of the input terminal of the main power circuit, a drain of the N-channel metal oxide semiconductor field effect transistor is connected to a negative pole of the output interface of the main power circuit, and a source of the N-channel metal oxide semiconductor field effect transistor is connected to the second pin of the control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921517962.9U CN210327382U (en) | 2019-09-12 | 2019-09-12 | Elevator band-type brake power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921517962.9U CN210327382U (en) | 2019-09-12 | 2019-09-12 | Elevator band-type brake power supply |
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| Publication Number | Publication Date |
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| CN210327382U true CN210327382U (en) | 2020-04-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921517962.9U Active CN210327382U (en) | 2019-09-12 | 2019-09-12 | Elevator band-type brake power supply |
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| CN (1) | CN210327382U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116388763A (en) * | 2023-04-10 | 2023-07-04 | 苏州领慧立芯科技有限公司 | DAC compatible with voltage/current output |
-
2019
- 2019-09-12 CN CN201921517962.9U patent/CN210327382U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116388763A (en) * | 2023-04-10 | 2023-07-04 | 苏州领慧立芯科技有限公司 | DAC compatible with voltage/current output |
| CN116388763B (en) * | 2023-04-10 | 2023-12-22 | 苏州领慧立芯科技有限公司 | DAC compatible with voltage/current output |
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