CN211557137U - Constant-power motor driving circuit - Google Patents
Constant-power motor driving circuit Download PDFInfo
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- CN211557137U CN211557137U CN202020493746.1U CN202020493746U CN211557137U CN 211557137 U CN211557137 U CN 211557137U CN 202020493746 U CN202020493746 U CN 202020493746U CN 211557137 U CN211557137 U CN 211557137U
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Abstract
The utility model relates to a constant power motor drive technical field, in particular to a constant power motor drive circuit, which comprises an input rectification filter circuit, an RCD absorption circuit, a power supply circuit, an output voltage compensation circuit, an isolation transformer circuit, an output rectification filter circuit, an output current compensation circuit and a constant power control circuit, wherein when the constant power works, the voltage is reduced, the current is increased, and the constant power circuit current compensation is controlled by setting the output current compensation circuit; the output power is kept unchanged through the constant power control circuit, and the requirement of heavy current output is met, so that constant power output is realized, and the design of motor drive is realized; the constant-power motor driving circuit designed by the scheme realizes the constant-power design of primary control, has low cost, meets the requirement of motor driving, has better reliability, reduces current increase and voltage, has lower requirements on power devices, and can be smaller in size.
Description
Technical Field
The utility model relates to a constant power motor drive technical field, in particular to constant power motor drive circuit.
Background
The motor drive of the traditional power supply design mainly adopts a Peak load (the instantaneous current is several times of the normal output current) circuit, the motor drive is realized by supplying large current instantly when the motor is driven, the output power during Peak load is several times of the output power during normal work, the design has high requirements on power components, the stress generated during Peak load must be met, and the cost is higher; therefore, how to design a circuit which is low in cost and can meet the requirement of motor driving is considered; it is known that motor drives require large currents but do not require high voltages, and therefore, a constant power design is an option; the constant power design reduces the voltage along with the increase of the current, reduces the element requirements, and only needs to increase the area of a power circuit to increase the heat dissipation when layout;
most constant power supplies in the market adopt an optical coupler for feedback control, and the circuit has high constant power precision and relatively high cost; for motor driving, only instantaneous large current needs to be started, and the motor driving does not need to be started, so that a constant-power motor driving circuit is particularly needed.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model aims to solve the technical problems that: the constant-power motor driving circuit is simple in circuit structure and low in cost, and meets the required product performance.
In order to solve the technical problem, the utility model discloses a technical scheme be:
the utility model provides a constant power motor drive circuit, includes input rectification filter circuit, RCD absorption circuit, supply circuit, output voltage compensating circuit, isolation transformer circuit, output rectification filter circuit, output current compensating circuit and constant power control circuit, output current compensating circuit is connected with RCD absorption circuit, output voltage compensating circuit, supply circuit, isolation transformer circuit and constant power control circuit electricity respectively, output voltage compensating circuit is connected with RCD absorption circuit, constant power control circuit, supply circuit and isolation transformer circuit electricity respectively, input rectification filter circuit is connected with RCD absorption circuit electricity, output rectification filter circuit is connected with isolation transformer circuit electricity.
Further, the constant power control circuit comprises a resistor R114, a resistor R113, a capacitor C108, a diode D104 and a triode Q101, wherein a base of the triode Q101 is electrically connected with one end of the resistor R113, one end of the resistor R114, one end of the capacitor C108 and a cathode of the diode D104, an emitter of the triode Q101 is electrically connected with the other end of the resistor R113, the other end of the capacitor C108 and an anode of the diode D104, an emitter of the triode Q101, the other end of the resistor R113, the other end of the capacitor C108 and an anode of the diode D104 are all grounded, a collector of the triode Q101 is electrically connected with the output current compensation circuit, and the other end of the resistor R114 is electrically connected with the output voltage compensation circuit and the isolation transformer circuit.
Further, the output current compensation circuit comprises a resistor R108, a resistor R109, a capacitor C105, a capacitor C106, a capacitor C107 and a chip U1, wherein the chip U1 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin;
the first pin of the chip U1 is electrically connected with a power supply circuit, the second pin of the chip U1 is electrically connected with an output voltage compensation circuit, the third pin of the chip U1 is electrically connected with one end of a resistor R108 and one end of a capacitor C106 respectively, the fourth pin of the chip U1 is electrically connected with a constant power control circuit, one end of a resistor R109 and one end of a capacitor C107 respectively, the fifth pin of the chip U1 is grounded, the sixth pin of the chip U1 is electrically connected with an RCD absorption circuit, the other end of the capacitor C106 is electrically connected with the other end of the capacitor C105, the other end of the resistor R109 and the other end of the capacitor C107 respectively, and the other ends of the capacitor C106, the capacitor C105, the resistor R109 and the capacitor C107 are all grounded.
Further, the output voltage compensation circuit includes a resistor R105, a resistor R106, a resistor R107, a resistor R111, a capacitor C103, and a diode D103, one end of the resistor R106 is electrically connected to the constant power control circuit, the isolation transformer circuit, the anode of the diode D103, and the power supply circuit, the cathode of the diode D103 is electrically connected to one end of the capacitor C103 and one end of the resistor R111, the other end of the resistor R111 is electrically connected to one end of the resistor R105, one end of the resistor R107, the other end of the resistor R106, and the output current compensation circuit, the other end of the capacitor C103 is electrically connected to the other end of the resistor R105, and the other end of the resistor R107 is grounded.
Further, the RCD absorption circuit includes a resistor R101, a resistor R103, a capacitor C101, and a diode D101, one end of the resistor R101 is electrically connected to the input rectifying and filtering circuit, one end of the capacitor C101, and the isolation transformer circuit, the other end of the capacitor C101 is electrically connected to one end of the resistor R101 and one end of the resistor R103, the other end of the resistor R103 is electrically connected to the cathode of the diode D101, and the anode of the diode D101 is electrically connected to the output current compensation circuit and the isolation transformer circuit, respectively.
Further, the power supply circuit comprises a resistor R104, a resistor R110, a resistor R112, a capacitor C102, a capacitor C104, an electrolytic capacitor EC103, a diode D102 and a voltage regulator tube ZD101, wherein one end of the resistor R104 is electrically connected with the cathode of the diode D102 and one end of the resistor R112 respectively, the other end of the resistor R104 is electrically connected with the cathode of the voltage regulator tube ZD101, one end of the resistor R110 and one end of the electrolytic capacitor EC103 respectively, the other end of the resistor R110 is electrically connected with one end of the capacitor C102, the anode of the voltage regulator tube ZD101 and the output current compensation circuit respectively, the other end of the capacitor C102 is electrically connected with the other end of the electrolytic capacitor EC103, the other end of the capacitor C102 and the other end of the electrolytic capacitor EC103 are grounded, the anode of the diode D102 is electrically connected with the output voltage compensation circuit and one end of the capacitor C104 respectively, and the other end of the.
Further, the input rectifying and filtering circuit comprises a rectifying bridge BD101, an inductor L1, an electrolytic capacitor EC101 and an electrolytic capacitor EC102, wherein a first end of the rectifying bridge BD101 is electrically connected with one end of the electrolytic capacitor EC101 and one end of the inductor L1 respectively, the other end of the inductor L1 is electrically connected with one end of the electrolytic capacitor EC102 and the RCD absorption circuit respectively, the other end of the electrolytic capacitor EC102 is electrically connected with the other end of the rectifying bridge BD101 respectively, and the other end of the electrolytic capacitor EC102, the other end of the electrolytic capacitor EC101 and a second end of the rectifying bridge BD101 are all grounded.
Further, the output rectifying and filtering circuit comprises a resistor R202, a resistor R201, a capacitor C202, an electrolytic capacitor EC201, an electrolytic capacitor EC202, a diode D201 and a transformer T201, one end of the primary winding of the transformer T201 is electrically connected with one end of the electrolytic capacitor EC202, one end of the resistor R201, one end of the electrolytic capacitor EC201, the cathode of the diode D201 and one end of the capacitor C202 respectively, one end of the secondary winding of the transformer T201 is respectively and electrically connected with the other end of the electrolytic capacitor EC202, the other end of the capacitor R201, the other end of the electrolytic capacitor EC201 and the isolation transformer circuit, one end of the secondary winding of the transformer T201, the other end of the electrolytic capacitor EC202, the other end of the capacitor R201 and the other end of the electrolytic capacitor EC201 are all grounded, the other end of the capacitor C202 is electrically connected with one end of the capacitor C201, the other end of the capacitor C201 is electrically connected with one end of the resistor R202, the other end of the resistor R202 is electrically connected with the anode of the diode D201 and the isolation transformer circuit respectively.
Further, the isolation transformer circuit includes a transformer T101, one end of a primary winding of the transformer T101 and the other end of the primary winding of the transformer T101 are both electrically connected to the RCD absorption circuit, one end of a secondary winding of the transformer T101 and the other end of the secondary winding of the transformer T101 are both electrically connected to the output rectification filter circuit, one end of an auxiliary winding of the transformer T101 is electrically connected to the output voltage compensation circuit, and the other end of the auxiliary winding of the transformer T101 is grounded.
Further, the input protection circuit comprises a fuse resistor F101, one end of the fuse resistor F101 is electrically connected with the input rectifying and filtering circuit, and the other end of the fuse resistor F101 is connected with a live wire.
The beneficial effects of the utility model reside in that:
an input rectification filter circuit is arranged to rectify input alternating current into direct current; the RCD absorption circuit is arranged to absorb a voltage peak generated by leakage inductance of the transformer; the power supply circuit is arranged to supply power to the output current compensation circuit; because the output line and the voltage loss are caused, the voltage loss caused by the output line is compensated by arranging the output voltage compensation circuit; the voltage after input rectification and filtration is converted into the voltage and the current which need to be output by arranging an isolation transformer circuit; the output after the circuit conversion of the isolation transformer is rectified and filtered by arranging an output rectifying and filtering circuit, and alternating current is filtered to output direct current; when the constant power circuit works, the voltage is reduced, the current is increased, and the output current compensation circuit is arranged to control the current compensation of the constant power circuit; the output power is kept unchanged through the constant power control circuit, and the requirement of heavy current output is met, so that constant power output is realized, and the design of motor drive is realized; the constant-power motor driving circuit designed by the scheme realizes the constant-power design of primary control, has low cost, meets the requirement of motor driving, has better reliability, reduces current increase and voltage, has lower requirements on power devices, and can be smaller in size.
Drawings
Fig. 1 is a circuit module connection diagram of a constant power motor driving circuit according to the present invention;
fig. 2 is a schematic circuit diagram of a constant power motor driving circuit according to the present invention;
fig. 3 shows a VI curve of a constant power of an actual test of a constant power motor driving circuit according to the present invention;
fig. 4 shows a VI curve of a constant power of an actual test of a constant power motor driving circuit according to the present invention;
fig. 5 is a test waveform diagram of a constant power motor driving circuit according to the present invention before improvement;
fig. 6 shows an improved test waveform of a constant power motor driving circuit according to the present invention;
description of reference numerals:
1. an input rectifying filter circuit; 2. an RCD absorption circuit; 3. a power supply circuit; 4. an output voltage compensation circuit; 5. an isolation transformer circuit; 6. an output rectifying filter circuit; 7. an output current compensation circuit; 8. a constant power control circuit; 9. an input protection circuit.
Detailed Description
In order to explain the technical content, the objects and the effects of the present invention in detail, the following description is made with reference to the accompanying drawings in combination with the embodiments.
Referring to fig. 1, the technical solution provided by the present invention is:
the utility model provides a constant power motor drive circuit, includes input rectification filter circuit, RCD absorption circuit, supply circuit, output voltage compensating circuit, isolation transformer circuit, output rectification filter circuit, output current compensating circuit and constant power control circuit, output current compensating circuit is connected with RCD absorption circuit, output voltage compensating circuit, supply circuit, isolation transformer circuit and constant power control circuit electricity respectively, output voltage compensating circuit is connected with RCD absorption circuit, constant power control circuit, supply circuit and isolation transformer circuit electricity respectively, input rectification filter circuit is connected with RCD absorption circuit electricity, output rectification filter circuit is connected with isolation transformer circuit electricity.
From the above description, the beneficial effects of the present invention are:
an input rectification filter circuit is arranged to rectify input alternating current into direct current; the RCD absorption circuit is arranged to absorb a voltage peak generated by leakage inductance of the transformer; the power supply circuit is arranged to supply power to the output current compensation circuit; because the output line and the voltage loss are caused, the voltage loss caused by the output line is compensated by arranging the output voltage compensation circuit; the voltage after input rectification and filtration is converted into the voltage and the current which need to be output by arranging an isolation transformer circuit; the output after the circuit conversion of the isolation transformer is rectified and filtered by arranging an output rectifying and filtering circuit, and alternating current is filtered to output direct current; when the constant power circuit works, the voltage is reduced, the current is increased, and the output current compensation circuit is arranged to control the current compensation of the constant power circuit; the output power is kept unchanged through the constant power control circuit, and the requirement of heavy current output is met, so that constant power output is realized, and the design of motor drive is realized; the constant-power motor driving circuit designed by the scheme realizes the constant-power design of primary control, has low cost, meets the requirement of motor driving, has better reliability, reduces current increase and voltage, has lower requirements on power devices, and can be smaller in size.
Further, the constant power control circuit comprises a resistor R114, a resistor R113, a capacitor C108, a diode D104 and a triode Q101, wherein a base of the triode Q101 is electrically connected with one end of the resistor R113, one end of the resistor R114, one end of the capacitor C108 and a cathode of the diode D104, an emitter of the triode Q101 is electrically connected with the other end of the resistor R113, the other end of the capacitor C108 and an anode of the diode D104, an emitter of the triode Q101, the other end of the resistor R113, the other end of the capacitor C108 and an anode of the diode D104 are all grounded, a collector of the triode Q101 is electrically connected with the output current compensation circuit, and the other end of the resistor R114 is electrically connected with the output voltage compensation circuit and the isolation transformer circuit.
As can be seen from the above description, by setting the resistor R114 and the resistor R113 to divide the voltage, the current flowing through the transistor Q101 is fed back to the fourth pin (PD pin) of the chip U1, so as to achieve the requirement of constant power; by providing the capacitor C108 to filter the spike voltage on the resistor R113, the diode D104 is the BE pole of the protection transistor Q101.
Further, the output current compensation circuit comprises a resistor R108, a resistor R109, a capacitor C105, a capacitor C106, a capacitor C107 and a chip U1, wherein the chip U1 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin;
the first pin of the chip U1 is electrically connected with a power supply circuit, the second pin of the chip U1 is electrically connected with an output voltage compensation circuit, the third pin of the chip U1 is electrically connected with one end of a resistor R108 and one end of a capacitor C106 respectively, the fourth pin of the chip U1 is electrically connected with a constant power control circuit, one end of a resistor R109 and one end of a capacitor C107 respectively, the fifth pin of the chip U1 is grounded, the sixth pin of the chip U1 is electrically connected with an RCD absorption circuit, the other end of the capacitor C106 is electrically connected with the other end of the capacitor C105, the other end of the resistor R109 and the other end of the capacitor C107 respectively, and the other ends of the capacitor C106, the capacitor C105, the resistor R109 and the capacitor C107 are all grounded.
From the above description, it can be seen that the power supply is connected to the chip U1 through the capacitor C107 for generating an internal 5.75V power supply, which will provide an automatic restart or latch-off option according to a fault condition based on the connection capacitor C107 determined at startup, and is connected to the chip U1 through the resistor R109 to set an output current point; the loop compensation loop is formed by the resistor R108, the capacitor C105 and the capacitor C106, the resistor R108 and the capacitor C105 establish a low-frequency to medium-frequency gain of 20dB for the error amplifier, and the capacitor C106 acts as a noise filter.
Further, the output voltage compensation circuit includes a resistor R105, a resistor R106, a resistor R107, a resistor R111, a capacitor C103, and a diode D103, one end of the resistor R106 is electrically connected to the constant power control circuit, the isolation transformer circuit, the anode of the diode D103, and the power supply circuit, the cathode of the diode D103 is electrically connected to one end of the capacitor C103 and one end of the resistor R111, the other end of the resistor R111 is electrically connected to one end of the resistor R105, one end of the resistor R107, the other end of the resistor R106, and the output current compensation circuit, the other end of the capacitor C103 is electrically connected to the other end of the resistor R105, and the other end of the resistor R107 is grounded.
As can be seen from the above description, the resistor R105, the resistor R106, and the resistor R111 form an upper bias resistor, the resistor R107 is a lower sheet resistor, and the high-frequency resistance and low-frequency resistance are provided through a capacitor, and the larger the upper bias resistor is, the higher the output voltage is; when the circuit is unloaded, the working frequency is low, the capacitor C103 is equivalent to an open circuit, the upward bias resistor consists of a resistor R111 and a resistor R106, when the circuit is fully loaded, the working frequency is high, the capacitor C103 is equivalent to a short circuit, and the upward bias resistor consists of a resistor R111, a resistor R106 and a resistor R105, so that when the circuit is fully loaded, the upward bias resistor is larger than that when the circuit is unloaded, the output voltage is higher, the loss caused by the output cord is compensated, and the output voltage can be basically kept consistent when the circuit is unloaded and fully loaded.
Further, the RCD absorption circuit includes a resistor R101, a resistor R103, a capacitor C101, and a diode D101, one end of the resistor R101 is electrically connected to the input rectifying and filtering circuit, one end of the capacitor C101, and the isolation transformer circuit, the other end of the capacitor C101 is electrically connected to one end of the resistor R101 and one end of the resistor R103, the other end of the resistor R103 is electrically connected to the cathode of the diode D101, and the anode of the diode D101 is electrically connected to the output current compensation circuit and the isolation transformer circuit, respectively.
As can be seen from the above description, when the switch tube in the chip U1 is turned off, the leakage inductance energy of the transformer T101 is not transferred to the secondary side for output, and if there is no RCD absorption circuit, the leakage inductance energy is transferred to the source and the drain of the switch tube in the chip U1 at the instant when the switch tube in the chip U1 is turned off, and at this time, the switch tube in the chip U1 is subjected to a high stress; after the RCD absorption circuit is added, most of the leakage inductance energy is transferred to the capacitor C101 of the absorption circuit at the moment when the switching tube inside the chip U1 is turned off, and then is consumed by the resistor R101 and the resistor R103, and the diode D101 acts as a circuit for unidirectional conduction.
Further, the power supply circuit comprises a resistor R104, a resistor R110, a resistor R112, a capacitor C102, a capacitor C104, an electrolytic capacitor EC103, a diode D102 and a voltage regulator tube ZD101, wherein one end of the resistor R104 is electrically connected with the cathode of the diode D102 and one end of the resistor R112 respectively, the other end of the resistor R104 is electrically connected with the cathode of the voltage regulator tube ZD101, one end of the resistor R110 and one end of the electrolytic capacitor EC103 respectively, the other end of the resistor R110 is electrically connected with one end of the capacitor C102, the anode of the voltage regulator tube ZD101 and the output current compensation circuit respectively, the other end of the capacitor C102 is electrically connected with the other end of the electrolytic capacitor EC103, the other end of the capacitor C102 and the other end of the electrolytic capacitor EC103 are grounded, the anode of the diode D102 is electrically connected with the output voltage compensation circuit and one end of the capacitor C104 respectively, and the other end of the.
From the above description, when the light-emitting tube inside the chip U1 is turned off, the electrolytic capacitor EC103 is charged through the auxiliary winding of the transformer T101 of the isolation transformer circuit via the diode D102 and the resistor R104, and the chip U1 is powered through the resistor R110; when the light pipe is opened inside the chip U1, power is supplied to the chip U1 through the electrolytic capacitor EC103 and the capacitor C102.
Further, the input rectifying and filtering circuit comprises a rectifying bridge BD101, an inductor L1, an electrolytic capacitor EC101 and an electrolytic capacitor EC102, wherein a first end of the rectifying bridge BD101 is electrically connected with one end of the electrolytic capacitor EC101 and one end of the inductor L1 respectively, the other end of the inductor L1 is electrically connected with one end of the electrolytic capacitor EC102 and the RCD absorption circuit respectively, the other end of the electrolytic capacitor EC102 is electrically connected with the other end of the rectifying bridge BD101 respectively, and the other end of the electrolytic capacitor EC102, the other end of the electrolytic capacitor EC101 and a second end of the rectifying bridge BD101 are all grounded.
As can be seen from the above description, the input ac power is rectified into dc power by the rectifier bridge BD101, and the inductor L101, the electrolytic capacitor EC101, and the electrolytic capacitor EC102 form a pi-type filter circuit to filter out ac components in the dc power rectified by the rectifier bridge BD 101.
Further, the output rectifying and filtering circuit comprises a resistor R202, a resistor R201, a capacitor C202, an electrolytic capacitor EC201, an electrolytic capacitor EC202, a diode D201 and a transformer T201, one end of the primary winding of the transformer T201 is electrically connected with one end of the electrolytic capacitor EC202, one end of the resistor R201, one end of the electrolytic capacitor EC201, the cathode of the diode D201 and one end of the capacitor C202 respectively, one end of the secondary winding of the transformer T201 is respectively and electrically connected with the other end of the electrolytic capacitor EC202, the other end of the capacitor R201, the other end of the electrolytic capacitor EC201 and the isolation transformer circuit, one end of the secondary winding of the transformer T201, the other end of the electrolytic capacitor EC202, the other end of the capacitor R201 and the other end of the electrolytic capacitor EC201 are all grounded, the other end of the capacitor C202 is electrically connected with one end of the capacitor C201, the other end of the capacitor C201 is electrically connected with one end of the resistor R202, the other end of the resistor R202 is electrically connected with the anode of the diode D201 and the isolation transformer circuit respectively.
From the above description, the energy of the secondary winding of the transformer T101 is rectified into direct current through the diode D201, the electrolytic capacitor EC201 and the electrolytic capacitor EC202 store energy and filter functions, the resistor R202, the capacitor C201 and the capacitor C202 serve as an absorption loop of the diode D201, and the peak voltage when the diode D201 is turned off is absorbed.
Further, the isolation transformer circuit includes a transformer T101, one end of a primary winding of the transformer T101 and the other end of the primary winding of the transformer T101 are both electrically connected to the RCD absorption circuit, one end of a secondary winding of the transformer T101 and the other end of the secondary winding of the transformer T101 are both electrically connected to the output rectification filter circuit, one end of an auxiliary winding of the transformer T101 is electrically connected to the output voltage compensation circuit, and the other end of the auxiliary winding of the transformer T101 is grounded.
From the above description, when the switching tube inside the chip U1 is turned on, energy is stored in the primary winding of the transformer T101, and when the switching tube inside the chip U1 is turned off, the energy stored in the primary winding of the transformer T101 is transferred to the secondary winding and the auxiliary winding of the transformer T101, the energy in the secondary winding of the transformer T101 is finally converted into an output voltage and a current, a part of the energy in the auxiliary winding of the transformer T101 supplies power to the chip through the power supply loop, and a part of the energy is controlled as the output voltage.
Further, the input protection circuit comprises a fuse resistor F101, one end of the fuse resistor F101 is electrically connected with the input rectifying and filtering circuit, and the other end of the fuse resistor F101 is connected with a live wire.
Referring to fig. 1 to 6, a first embodiment of the present invention is:
referring to fig. 1, a constant power motor driving circuit includes an input rectification filter circuit 1, an RCD absorption circuit 2, a power supply circuit 3, an output voltage compensation circuit 4, an isolation transformer circuit 5, an output rectification filter circuit 6, an output current compensation circuit 7, and a constant power control circuit 8, where the output current compensation circuit 7 is electrically connected to the RCD absorption circuit 2, the output voltage compensation circuit 4, the power supply circuit 3, the isolation transformer circuit 5, and the constant power control circuit 8, the output voltage compensation circuit 4 is electrically connected to the RCD absorption circuit 2, the constant power control circuit 8, the power supply circuit 3, and the isolation transformer circuit 5, the input rectification filter circuit is electrically connected to the RCD absorption circuit 2, and the output rectification filter circuit 6 is electrically connected to the isolation transformer circuit 5.
Referring to fig. 2, the constant power control circuit 8 includes a resistor R114 (having a resistance of 68K Ω), a resistor R113 (having a resistance of 10K Ω), a capacitor C108 (having a capacitance of 100pF), a diode D104 (having a model of 1N4148), and a transistor Q101 (having a model of 3904), wherein a base of the transistor Q101 is electrically connected to one end of the resistor R113, one end of the resistor R114, one end of the capacitor C108, and a cathode of the diode D104, an emitter of the transistor Q101 is electrically connected to the other end of the resistor R113, the other end of the capacitor C108, and an anode of the diode D104, an emitter of the transistor Q101, the other end of the resistor R113, the other end of the capacitor C108, and an anode of the diode D104 are all grounded, a collector of the transistor Q101 is electrically connected to the output current compensation circuit 7, and another end of the resistor R114 is electrically connected to the output.
Referring to fig. 2, the output current compensation circuit 7 includes a resistor R108 (having a resistance of 68K Ω), a resistor R109 (having a resistance of 15K Ω), a capacitor C105 (having a capacitance of 100nF), a capacitor C106 (having a capacitance of 100pF), a capacitor C107 (having a capacitance of 4.7nF), and a chip U1, where the chip U1 includes a first pin, a second pin, a third pin, a fourth pin, a fifth pin, and a sixth pin;
the first pin of the chip U1 is electrically connected with the power supply circuit 3, the second pin of the chip U1 is electrically connected with the output voltage compensation circuit 4, the third pin of the chip U1 is electrically connected with one end of the resistor R108 and one end of the capacitor C106 respectively, the fourth pin of the chip U1 is electrically connected with the constant power control circuit 8, one end of the resistor R109 and one end of the capacitor C107 respectively, the fifth pin of the chip U1 is grounded, the sixth pin of the chip U1 is electrically connected with the RCD absorption circuit 2, the other end of the capacitor C106 is electrically connected with the other end of the capacitor C105, the other end of the resistor R109 and the other end of the capacitor C107 respectively, and the other end of the capacitor C106, the other end of the capacitor C105, the other end of the resistor R109 and the other end of the capacitor C107 are all grounded.
Referring to fig. 2, the output voltage compensation circuit 4 includes a resistor R105 (having a resistance value of 680K Ω), a resistor R106 (having a resistance value of 51K Ω), a resistor R107 (having a resistance value of 7.15K Ω), a resistor R111 (having a resistance value of 1M Ω), a capacitor C103 (having a capacitance value of 100nF), and a diode D103 (having a model of BAV21), one end of the resistor R106 is electrically connected to the constant power control circuit 8, the isolation transformer circuit 5, the anode of the diode D103, and the power supply circuit 3, the cathode of the diode D103 is electrically connected to one end of the capacitor C103 and one end of the resistor R111, the other end of the resistor R111 is electrically connected to one end of the resistor R105, one end of the resistor R107, the other end of the resistor R106, and the output current compensation circuit 7, the other end of the capacitor C103 is electrically connected to the other end of the resistor R105, and.
Referring to fig. 2, the RCD snubber circuit 2 includes a resistor R101 (having a resistance value of 680K Ω), a resistor R103 (having a resistance value of 47 Ω), a capacitor C101 (having a capacitance value of 1nF), and a diode D101 (having a model number of M7), wherein one end of the resistor R101 is electrically connected to the input rectifying and filtering circuit 1, one end of the capacitor C101, and the isolation transformer circuit 5, the other end of the capacitor C101 is electrically connected to one end of the resistor R101 and one end of the resistor R103, the other end of the resistor R103 is electrically connected to a cathode of the diode D101, and an anode of the diode D101 is electrically connected to the output current compensation circuit 7 and the isolation transformer circuit 5, respectively.
Referring to fig. 2, the power supply circuit 3 includes a resistor R104 (with a resistance of 4.7 Ω), a resistor R110 (with a resistance of 4.7 Ω), a resistor R112 (with a resistance of 20 Ω), a capacitor C102 (with a capacitance of 4.7uF), a capacitor C104 (with a capacitance of 220pF), an electrolytic capacitor EC103 (with a capacitance of 22uF), a diode D102 (with a model of F7), and a zener diode ZD101 (with a model of MM1Z15), one end of the resistor R104 is electrically connected to a cathode of the diode D102 and one end of the resistor R112, the other end of the resistor R104 is electrically connected to a cathode of the zener diode ZD101, one end of the resistor R110, and one end of the electrolytic capacitor EC103, the other end of the resistor R110 is electrically connected to one end of the capacitor C102, an anode of the zener diode ZD101, and the output current compensation circuit 7, the other end of the capacitor C102 is electrically connected to the other end of the electrolytic capacitor EC103, and the other ends of the capacitor EC102 and, the anode of the diode D102 is electrically connected to the output voltage compensation circuit 4 and one end of the capacitor C104, and the other end of the capacitor C104 is electrically connected to the other end of the resistor R112.
Referring to fig. 2, the input rectifying and filtering circuit 1 includes a rectifying bridge BD101 (current value is 2A, voltage value is 1KV), an inductor L1 (inductance value is 150uH), an electrolytic capacitor EC101 (capacitance value is 27uF), and an electrolytic capacitor EC102 (capacitance value is 27uF), a first end of the rectifying bridge BD101 is electrically connected to one end of the electrolytic capacitor EC101 and one end of the inductor L1, another end of the inductor L1 is electrically connected to one end of the electrolytic capacitor EC102 and the RCD absorption circuit 2, another end of the electrolytic capacitor EC102 is electrically connected to another end of the rectifying bridge BD101, and another end of the electrolytic capacitor EC102, another end of the electrolytic capacitor EC101, and a second end of the rectifying bridge BD101 are all grounded.
Referring to fig. 2, the output rectifying and filtering circuit 6 includes a resistor R202 (with a resistance of 5.1 Ω), a resistor R201 (with a resistance of 100K Ω), a capacitor C201 (with a capacitance of 470pF), a capacitor C202 (with a capacitance of 470pF), an electrolytic capacitor EC201 (with a capacitance of 330uF), an electrolytic capacitor EC202 (with a capacitance of 330uF), a diode D201 (with a model of SR8150H, a current value of 8A, and a voltage value of 150V), and a transformer T201 (with a model of PQ2017), wherein one end of a primary winding of the transformer T201 is electrically connected to one end of the electrolytic capacitor EC202, one end of the resistor R201, one end of the electrolytic capacitor EC201, a cathode of the diode D201, and one end of the capacitor C202, one end of a secondary winding of the transformer T201 is electrically connected to the other end of the electrolytic capacitor EC202, the other end of the capacitor R201, the other end of the electrolytic capacitor EC201, the other end of the transformer T201, and the, The other end of the electrolytic capacitor EC202, the other end of the capacitor R201 and the other end of the electrolytic capacitor EC201 are all grounded, the other end of the capacitor C202 is electrically connected with one end of the capacitor C201, the other end of the capacitor C201 is electrically connected with one end of the resistor R202, and the other end of the resistor R202 is respectively electrically connected with the anode of the diode D201 and the isolation transformer circuit 5.
Referring to fig. 2, the isolation transformer circuit 5 includes a transformer T101 (model number is PQ2017), one end of a primary winding of the transformer T101 and the other end of the primary winding of the transformer T101 are both electrically connected to the RCD snubber circuit 2, one end of a secondary winding of the transformer T101 and the other end of the secondary winding of the transformer T101 are both electrically connected to the output rectifying and filtering circuit 6, one end of an auxiliary winding of the transformer T101 is electrically connected to the output voltage compensation circuit 4, and the other end of the auxiliary winding of the transformer T101 is grounded.
Referring to fig. 2, the input protection circuit 9 is further included, the input protection circuit 9 includes a fuse resistor F101 (current value is 2A, voltage value is 250V), one end of the fuse resistor F101 is electrically connected to the input rectifying and filtering circuit 1, and the other end of the fuse resistor F101 is connected to a live wire.
The working principle of the constant-power motor driving circuit designed by the scheme is as follows:
the constant power control circuit 8 collects the voltage of an auxiliary winding of the transformer T101, divides the voltage through a resistor R114 and a resistor R113, and feeds the current flowing through the triode Q101 back to a fourth pin (PD pin) of the chip U1 to meet the requirement of constant power; when the circuit normally works, the upper resistor (resistor R114) and the lower resistor (resistor R113) are basically unchanged through voltage division, the triode Q101 is normally conducted, when the output current of the circuit is gradually increased, the output voltage is gradually reduced, the voltage of the auxiliary winding is gradually reduced along with the reduction of the output voltage, meanwhile, the upper resistor (resistor R114) and the lower resistor (resistor R113) are also gradually reduced through voltage division, when the output voltage is reduced to be below 7V, the current which is provided to the base electrode of the triode Q101 by the upper resistor (resistor R114) and the lower resistor (resistor R113) through voltage division cannot enable the triode Q101 to be conducted, the triode Q101 is turned off, the fourth pin of the chip U1 cannot be grounded, the chip U1 enters a protection mode, and the circuit does not output; the capacitor C108 is arranged to filter the spike voltage on the resistor R113, and the diode D104 is the BE pole of the protection transistor Q101.
By utilizing the characteristics of the fourth pin (i.e., PD pin) of the chip U1: current I flowing through PD pinPDThe smaller, the larger the restriction point, the normal operating restriction point is set at 50%,due to IPDI.e. the collector current I of the triode Q101CFrom the characteristics of the triode IC＝IBβ knowledge thatBThe smaller, ICThe smaller, IPDThe smaller the output current, the larger the output current, so according to the formula:
IC＝IB*β；
IB＝((VOUT+VD201) NA/NS-0.7)/R114, wherein VD201Is the voltage of diode D201;
in the above formula, only VOUTIs a variable, VOUTDecrease of IBAnd ICWith a consequent decrease ofPDThe output current becomes larger with the synchronous reduction, thereby realizing the constant power design, IPDThe current versus output current relationship is shown in table 1:
table 1:
as can be seen from Table 1, IPDThe smaller the current is, the larger the output current is;
based on the above points, the values of the resistor R114 and the resistor R113 are designed and calculated correspondingly, and the voltage of the resistor R113 is 0.7V, I on the premise of ensuring the normal conduction of the triode Q101R113The current value of the transistor Q101 that can be normally turned on is R113 ═ 0.7/IR113，R114＝((VOUT+VD201)*NA/NS-0.7)/IR113；
For the VI curve of the actual test constant power, please refer to fig. 3 and fig. 4.
When the output current is from no load to full load, the voltage of a line terminal is low due to loss on an output DC Cord (direct current output line) line, and the output voltage is controlled by upper and lower sheet resistors of a second pin (FB pin) of a chip U1, so that in order to make the voltage of the no load and full load line terminals basically consistent, a line compensation circuit (composed of a diode D103, a capacitor C103, a resistor R105 and a resistor R111) is added in the circuit design by utilizing the high-frequency and low-frequency resistance characteristic of a capacitor, and the output voltage is higher as the upper bias resistor is larger according to the following output voltage calculation formula; during no-load, the working frequency is low, the capacitor C103 is equivalent to an open circuit, the upward biased resistor consists of a resistor R111 and a resistor R106, during full-load, the working frequency is high, the capacitor C103 is equivalent to a short circuit, and the upward biased resistor consists of a resistor R111, a resistor R106 and a resistor R105, so that during full-load, the upward biased resistor is larger than that during no-load, the output voltage is higher, the loss caused by the output cord is compensated, and the output voltage can be basically consistent during no-load and full-load;
the output voltage calculation formula is as follows:
VOUT＝(VFB/R107+(VFB+0.7+VC103)/R105+(VFB+0.7)/R111+VFB/R106)/(1/R105+1/R111+1/R106)/(NA*0.99)*NS-VD201-Io*Rcable
wherein, VOUTRepresents the output voltage;
VFBrepresents the FB pin reference voltage;
r106 represents the upper resistance of the FB pin;
r107 represents the lower resistance of the FB pin;
r111 and R105 represent line compensation resistances;
VC103the voltage on the line compensation capacitor is represented;
VD201representing the output schottky diode forward voltage drop;
NA represents the number of auxiliary winding turns of the transformer T101;
NS denotes the number of secondary winding turns of the transformer T101;
Iorepresents the output current;
Rcablerepresenting the output DC cordid line impedance.
Under the condition that the diode D101 is short-circuited in a failure mode, the output voltage of the secondary winding of the transformer T101 can be increased, so that the output voltage of the circuit is abnormal; by arranging the voltage regulator tube ZD101, the output voltage of the secondary winding of the transformer T101 is increased under the failure condition, the voltage of the auxiliary winding of the transformer T101 is also increased, the voltage of the voltage regulator tube ZD101 is reversely broken down by the overhigh voltage, and the current flowing into the first pin (namely BP pin) of the chip U1 exceeds the protection current of the chip U1, so that the chip U1 does not work, the output voltage of the circuit is reduced, and the protection effect is achieved;
after the improvement, a failure mode test is performed, it can be seen that the output is still stable, there is no potential safety hazard, the output voltage before the improvement instantaneously exceeds 59V, and the output voltage after the improvement is stable and unchanged, and for concrete test waveforms before and after the improvement, refer to fig. 5 (before the improvement) and fig. 6 (after the improvement).
To sum up, the present invention provides a constant power motor driving circuit, which rectifies an input ac into a dc by providing an input rectifying and filtering circuit; the RCD absorption circuit is arranged to absorb a voltage peak generated by leakage inductance of the transformer; the power supply circuit is arranged to supply power to the output current compensation circuit; because the output line and the voltage loss are caused, the voltage loss caused by the output line is compensated by arranging the output voltage compensation circuit; the voltage after input rectification and filtration is converted into the voltage and the current which need to be output by arranging an isolation transformer circuit; the output after the circuit conversion of the isolation transformer is rectified and filtered by arranging an output rectifying and filtering circuit, and alternating current is filtered to output direct current; when the constant power circuit works, the voltage is reduced, the current is increased, and the output current compensation circuit is arranged to control the current compensation of the constant power circuit; the output power is kept unchanged through the constant power control circuit, and the requirement of heavy current output is met, so that constant power output is realized, and the design of motor drive is realized; the constant-power motor driving circuit designed by the scheme realizes the constant-power design of primary control, has low cost, meets the requirement of motor driving, has better reliability, reduces current increase and voltage, has lower requirements on power devices, and can be smaller in size.
The above mentioned is only the embodiment of the present invention, and not the limitation of the patent scope of the present invention, all the equivalent transformations made by the contents of the specification and the drawings, or the direct or indirect application in the related technical field, are included in the patent protection scope of the present invention.
Claims (10)
1. The utility model provides a constant power motor drive circuit, its characterized in that, is including input rectification filter circuit, RCD absorption circuit, supply circuit, output voltage compensating circuit, isolation transformer circuit, output rectification filter circuit, output current compensating circuit and constant power control circuit, output current compensating circuit is connected with RCD absorption circuit, output voltage compensating circuit, supply circuit, isolation transformer circuit and constant power control circuit electricity respectively, output voltage compensating circuit is connected with RCD absorption circuit, constant power control circuit, supply circuit and isolation transformer circuit electricity respectively, input rectification filter circuit is connected with RCD absorption circuit electricity, output rectification filter circuit is connected with isolation transformer circuit electricity.
2. The constant-power motor driving circuit according to claim 1, wherein the constant-power control circuit comprises a resistor R114, a resistor R113, a capacitor C108, a diode D104, and a transistor Q101, wherein a base of the transistor Q101 is electrically connected to one end of the resistor R113, one end of the resistor R114, one end of the capacitor C108, and a cathode of the diode D104, respectively, an emitter of the transistor Q101 is electrically connected to the other end of the resistor R113, the other end of the capacitor C108, and an anode of the diode D104, respectively, and an emitter of the transistor Q101, the other end of the resistor R113, the other end of the capacitor C108, and an anode of the diode D104 are all grounded, a collector of the transistor Q101 is electrically connected to the output current compensation circuit, and the other end of the resistor R114 is electrically connected to the output voltage compensation circuit and the isolation.
3. The constant-power motor driving circuit according to claim 1, wherein the output current compensation circuit comprises a resistor R108, a resistor R109, a capacitor C105, a capacitor C106, a capacitor C107 and a chip U1, and the chip U1 comprises a first pin, a second pin, a third pin, a fourth pin, a fifth pin and a sixth pin;
the first pin of the chip U1 is electrically connected with a power supply circuit, the second pin of the chip U1 is electrically connected with an output voltage compensation circuit, the third pin of the chip U1 is electrically connected with one end of a resistor R108 and one end of a capacitor C106 respectively, the fourth pin of the chip U1 is electrically connected with a constant power control circuit, one end of a resistor R109 and one end of a capacitor C107 respectively, the fifth pin of the chip U1 is grounded, the sixth pin of the chip U1 is electrically connected with an RCD absorption circuit, the other end of the capacitor C106 is electrically connected with the other end of the capacitor C105, the other end of the resistor R109 and the other end of the capacitor C107 respectively, and the other ends of the capacitor C106, the capacitor C105, the resistor R109 and the capacitor C107 are all grounded.
4. The constant-power motor driving circuit according to claim 1, wherein the output voltage compensation circuit comprises a resistor R105, a resistor R106, a resistor R107, a resistor R111, a capacitor C103, and a diode D103, wherein one end of the resistor R106 is electrically connected to the constant-power control circuit, the isolation transformer circuit, the anode of the diode D103, and the power supply circuit, the cathode of the diode D103 is electrically connected to one end of the capacitor C103 and one end of the resistor R111, the other end of the resistor R111 is electrically connected to one end of the resistor R105, one end of the resistor R107, the other end of the resistor R106, and the output current compensation circuit, the other end of the capacitor C103 is electrically connected to the other end of the resistor R105, and the other end of the resistor R107 is grounded.
5. The constant-power motor driving circuit according to claim 1, wherein the RCD absorption circuit comprises a resistor R101, a resistor R103, a capacitor C101 and a diode D101, one end of the resistor R101 is electrically connected to the input rectifying and filtering circuit, one end of the capacitor C101 and the isolation transformer circuit, the other end of the capacitor C101 is electrically connected to one end of the resistor R101 and one end of the resistor R103, the other end of the resistor R103 is electrically connected to the cathode of the diode D101, and the anode of the diode D101 is electrically connected to the output current compensation circuit and the isolation transformer circuit.
6. The constant-power motor driving circuit according to claim 1, wherein the power supply circuit comprises a resistor R104, a resistor R110, a resistor R112, a capacitor C102, a capacitor C104, an electrolytic capacitor EC103, a diode D102 and a voltage regulator tube ZD101, one end of the resistor R104 is electrically connected to the cathode of the diode D102 and one end of the resistor R112, the other end of the resistor R104 is respectively and electrically connected with the cathode of the voltage regulator tube ZD101, one end of the resistor R110 and one end of the electrolytic capacitor EC103, the other end of the resistor R110 is electrically connected to one end of the capacitor C102, the anode of the zener diode ZD101 and the output current compensation circuit, the other end of the capacitor C102 is electrically connected with the other end of the electrolytic capacitor EC103, the other end of the capacitor C102 and the other end of the electrolytic capacitor EC103 are both grounded, the anode of the diode D102 is electrically connected to the output voltage compensation circuit and one end of the capacitor C104, and the other end of the capacitor C104 is electrically connected to the other end of the resistor R112.
7. The constant-power motor driving circuit according to claim 1, wherein the input rectifying and filtering circuit comprises a rectifying bridge BD101, an inductor L1, an electrolytic capacitor EC101 and an electrolytic capacitor EC102, a first end of the rectifying bridge BD101 is electrically connected with one end of the electrolytic capacitor EC101 and one end of the inductor L1 respectively, the other end of the inductor L1 is electrically connected with one end of the electrolytic capacitor EC102 and the RCD absorption circuit respectively, the other end of the electrolytic capacitor EC102 is electrically connected with the other end of the rectifying bridge BD101 respectively, and the other end of the electrolytic capacitor EC102, the other end of the electrolytic capacitor EC101 and the second end of the rectifying bridge BD101 are all grounded.
8. The constant-power motor driving circuit according to claim 1, wherein the output rectifying filter circuit comprises a resistor R202, a resistor R201, a capacitor C202, an electrolytic capacitor EC201, an electrolytic capacitor EC202, a diode D201 and a transformer T201, one end of a primary winding of the transformer T201 is electrically connected with one end of the electrolytic capacitor EC202, one end of the resistor R201, one end of the electrolytic capacitor EC201, a cathode of the diode D201 and one end of the capacitor C202 respectively, one end of a secondary winding of the transformer T201 is electrically connected with the other end of the electrolytic capacitor EC202, the other end of the capacitor R201, the other end of the electrolytic capacitor EC201 and the isolation transformer circuit respectively, one end of the secondary winding of the transformer T201, the other end of the electrolytic capacitor EC202, the other end of the capacitor R201 and the other end of the electrolytic capacitor EC201 are grounded, the other end of the capacitor C202 is electrically connected with one end of the capacitor C201, the other end of the capacitor C201 is electrically connected with one end of a resistor R202, and the other end of the resistor R202 is respectively electrically connected with the anode of the diode D201 and the isolation transformer circuit.
9. The constant-power motor driving circuit according to claim 1, wherein the isolation transformer circuit includes a transformer T101, one end of a primary winding of the transformer T101 and the other end of the primary winding of the transformer T101 are electrically connected to the RCD snubber circuit, one end of a secondary winding of the transformer T101 and the other end of the secondary winding of the transformer T101 are electrically connected to the output rectifying filter circuit, one end of an auxiliary winding of the transformer T101 is electrically connected to the output voltage compensation circuit, and the other end of the auxiliary winding of the transformer T101 is grounded.
10. The constant-power motor driving circuit according to claim 1, further comprising an input protection circuit, wherein the input protection circuit comprises a fuse resistor F101, one end of the fuse resistor F101 is electrically connected to the input rectifying and filtering circuit, and the other end of the fuse resistor F101 is connected to a live wire.
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