CN217469754U - Power supply circuit and frequency converter with same - Google Patents
Power supply circuit and frequency converter with same Download PDFInfo
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- CN217469754U CN217469754U CN202221226308.4U CN202221226308U CN217469754U CN 217469754 U CN217469754 U CN 217469754U CN 202221226308 U CN202221226308 U CN 202221226308U CN 217469754 U CN217469754 U CN 217469754U
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Abstract
The utility model belongs to the technical field of the converter, a power supply circuit and have power supply circuit's converter is specifically disclosed. The power supply circuit comprises an LN input circuit, a discharge circuit and a rectification filter circuit. The LN input circuit comprises a thermistor and a thermistor short circuit; the thermistor short circuit is connected to two ends of the thermistor, the thermistor is connected to the power circuit when the thermistor short circuit is in an off state, and the thermistor is in a short circuit when the thermistor short circuit is in an on state; in addition, a reactor interface is additionally arranged in the power circuit and used for externally connecting the reactor. The frequency converter effectively reduces the loss of the frequency converter, increases the efficiency of the frequency converter, increases the power factor and reduces the interference of harmonic current by applying the power supply circuit. Furthermore, the utility model discloses can compatible PWM simultaneously and two kinds of communication modes of mechanical frequency conversion Drop-in.
Description
Technical Field
The utility model relates to a power supply circuit and have power supply circuit's converter.
Background
A conventional commercial inverter has a power supply circuit having three parts, i.e., an LN input circuit, a discharge circuit, and a rectifying/smoothing circuit, as shown in fig. 1. The LN input circuit, the discharge circuit and the rectification filter circuit are connected in sequence.
The LN input circuit mainly comprises a fuse F1, a thermistor NTC1, a voltage dependent resistor RV1 and the like. After the frequency converter is started, the thermistor NTC1 is always in a working state, so that the circuit loss is relatively large.
In addition, because no reactor is arranged in the current power supply circuit, the power factor of the circuit is lower, and the harmonic current interference is larger.
SUMMERY OF THE UTILITY MODEL
The present invention is directed to a power circuit to solve the circuit loss caused by the thermistor.
The utility model discloses a realize above-mentioned purpose, adopt following technical scheme:
a power supply circuit includes an LN input circuit, a discharge circuit, and a rectifying-smoothing circuit;
the LN input circuit comprises a thermistor and a thermistor short circuit;
the thermistor short circuit is connected to two ends of the thermistor, the thermistor is connected to the power circuit when the thermistor short circuit is in an off state, and the thermistor is in a short circuit when the thermistor short circuit is in an on state.
Preferably, the thermistor short circuit comprises a triode, a first resistor, a diode and a relay;
the triode is an NPN type triode; the base electrode end of the triode is a control signal input end, the emitter electrode end of the triode is grounded, and the collector electrode end of the triode is connected with one end of the first resistor and the positive electrode end of the diode;
the other end of the first resistor is connected with one end of an input loop of the relay;
the other end of the input loop of the relay and the cathode end of the diode are connected with a positive voltage terminal;
each end of the output loop of the relay is correspondingly connected to one end of the thermistor.
Preferably, the LN input circuit further comprises a fuse, a varistor, and a power input port;
wherein, one end of the fuse, one end of the piezoresistor and one end of the thermistor are connected; the other end of the fuse and the other end of the piezoresistor are respectively connected to one connecting terminal of the power input port;
the other end of the thermistor and the other end of the piezoresistor are respectively connected to the discharge circuit.
Preferably, the LN input circuit further comprises a reactor interface;
the reactor interface is arranged on a connecting circuit between the piezoresistor and the discharge circuit.
Preferably, an external reactor is connected to the reactor interface.
Furthermore, on the basis of above-mentioned power supply circuit, the utility model also provides a converter to solve because thermistor is not increased by the converter consumption that the short circuit caused after the converter starts, influence the problem of converter efficiency.
The utility model discloses a realize above-mentioned purpose, adopt following technical scheme:
a frequency converter comprises a main control chip, a power circuit, a communication circuit, a feedback circuit and a driving circuit;
the power circuit adopts the power circuit mentioned above.
Preferably, the communication circuit comprises a PWM signal input port and a mechanical variable frequency Drop-in input port; the PWM signal input port and the mechanical variable frequency Drop-in input port are connected into the communication circuit in an alternative mode.
The utility model has the advantages of as follows:
as described above, the present invention relates to a power supply circuit in which thermistor short circuits are connected to both ends of a thermistor, and the thermistor short circuits can be short-circuited after the following frequency converter is started; in addition, a reactor interface is also arranged in the power circuit and used for externally connecting a reactor. The utility model provides a converter does benefit to on the one hand and reduces the converter loss through the power supply circuit who uses above-mentioned circuit structure, increases converter efficiency, and on the other hand passes through external reactor, can effectively increase power factor, reduces harmonic current and disturbs. Furthermore, the utility model discloses still improved communication circuit's structure on the basis of above structure, therefore compatible PWM and mechanical frequency conversion Drop-in two kinds of communication mode simultaneously.
Drawings
FIG. 1 is a schematic diagram of a power circuit in the prior art;
fig. 2 is a schematic structural diagram of a power supply circuit in embodiment 1 of the present invention;
fig. 3 is a schematic structural diagram of a power supply circuit in embodiment 2 of the present invention;
fig. 4 is a block diagram of the frequency converter according to embodiment 3 of the present invention;
fig. 5 is a schematic structural diagram of a communication circuit in embodiment 3 of the present invention.
The circuit comprises a 1-LN input circuit, a 2-discharge circuit, a 3-rectification filter circuit, a 4-thermistor short circuit, a 5-main control chip, a 6-power circuit, a 7-communication circuit, an 8-feedback circuit and a 9-driving circuit.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments:
example 1
As shown in fig. 2, the present embodiment 1 describes a power supply circuit of a frequency converter, which includes an LN input circuit 1, a discharge circuit 2, and a rectifying-smoothing circuit 3.
The discharge circuit 2 and the rectifying and filtering circuit 3 are not improved, and the related structures can refer to the existing structures.
The LN input circuit 1 in this embodiment includes a thermistor NTC1 and a thermistor short circuit 4.
The thermistor short circuit 4 is connected to two ends of the thermistor NTC1, and functions to short-circuit the thermistor NTC1 after the frequency converter is started in embodiment 3, so as to reduce the loss of the frequency converter and increase the efficiency of the frequency converter.
The specific working state of the thermistor short circuit 4 is as follows: the thermistor NTC1 is connected in the power supply circuit when the thermistor short circuit 4 is in the off state, and the thermistor short circuit is shorted when the thermistor short circuit is in the on state.
The embodiment 1 provides a preferred structure of the thermistor shorting circuit 4, as shown in fig. 2. The thermistor short circuit comprises a triode Q1, a first resistor R1, a diode D1 and a relay U1.
The triode Q1 is an NPN type triode, a base terminal of the triode Q1 is a control signal input terminal NTC1_ C, and the control signal input terminal NTC1_ C is connected with a main control chip of the frequency converter.
The control signal input end NTC1_ C is used for controlling the conduction of the relay U1, and further shorting the thermistor NTC 1.
The emitter terminal of the triode Q1 is grounded, and the collector terminal of the triode Q1 is connected with one end of the first resistor R1 and the positive terminal of the diode D1; the other end of the first resistor R1 is connected to one end of the input loop of the relay U1.
The other end of the input loop of relay U1 and the negative terminal of diode D1 are connected to a positive voltage (15V) terminal. Each end of the output circuit of the relay U1 is connected to one end of the thermistor NTC 1.
The working process of the thermistor short circuit in the embodiment is as follows:
when the control signal input end NTC1_ C applies a high level, the transistor Q1 is turned on, and the input loop of the relay U1 operates, so that the output loop of the relay U1 is turned on, and the thermistor NTC1 is shorted.
After the frequency converter is started, the thermistor NTC1 is in short circuit, so that the loss of the frequency converter is reduced, and the efficiency of the frequency converter is increased.
In addition, the LN input circuit also includes a fuse F1, a varistor RV1, and a power input port J1.
One end of the fuse F1, one end of the piezoresistor RV1 and one end of the thermistor NTC1 are connected; the other end of the fuse F1 and the other end of the piezoresistor RV1 are respectively connected to one connection terminal of the power input port J1.
The other end of the thermistor NTC1 and the other end of the varistor RV1 are connected to the discharge circuit 2, respectively.
Example 2
This embodiment 2 describes a power supply circuit, and the power supply circuit can refer to the above embodiment 1 except that the following technical features are different from those of the above embodiment 1.
As shown in fig. 3, the LN input circuit in the present embodiment further includes a reactor interface J2. Reactor interface J2 is provided on the connection line between varistor RV1 and discharge circuit 2. And an external reactor is connected to the reactor interface J2.
In the embodiment, the reactor is externally connected in the power circuit, so that the power factor is increased, and the harmonic current interference is effectively reduced.
Example 3
As shown in fig. 4, embodiment 3 describes a frequency converter, which includes a main control chip 5, a power circuit 6, a communication circuit 7, a feedback circuit 8, and a driving circuit 9, and the connection relationships of the above components are known and are not described again.
The functions of each functional circuit in the frequency converter are respectively as follows:
the input of the communication circuit 7 is controlled by the main control chip 5 to control the turn-off, turn-on and rotation speed of the frequency converter.
The feedback circuit 8 samples and feeds back the output current of the frequency converter and the bus voltage, and is used for providing current protection, voltage protection and the like.
The drive circuit 9 is used to provide the compressor three-phase output voltage.
The power supply circuit 6 in this embodiment 3 employs the power supply circuit in the above embodiment 1 or embodiment 2.
When the power circuit 6 in embodiment 3 adopts the power circuit in embodiment 1, the thermistor NTC1 can be shorted after the frequency converter is started, so that the loss of the frequency converter is effectively reduced, and the efficiency of the frequency converter is increased.
When the power supply circuit 6 in the present embodiment 3 adopts the power supply circuit in the above embodiment 2, in addition to the above technical effects, the present embodiment 3 can effectively increase the power factor and effectively reduce the harmonic current interference.
On the basis of the above structure, the structure of the communication circuit 7 is further improved in this embodiment 3, so as to solve the problem that the existing communication circuit is single in communication mode and cannot be compatible with Drop in mechanical frequency conversion communication mode when the PWM communication mode is mostly adopted.
The communication circuit 7 comprises a PWM signal input port and a mechanical frequency conversion Drop-in input port, and the PWM signal input port and the mechanical frequency conversion Drop-in input port are connected into the communication circuit in an alternative mode.
Besides, the communication circuit 7 further includes an optocoupler U2, a diode D3, a diode D4, a resistor R5, a resistor R6, a resistor R7, a resistor R8, a capacitor C7, a capacitor C8, and the connection relationship is as shown in fig. 5.
The PWM signal input port and the mechanical frequency conversion Drop-in input port are input ports J3 of the communication circuit 7. The output terminal of the communication circuit 7 is denoted by PWMIN and is connected to the capture port of the main control chip 5 for detecting the PWM frequency.
In fig. 5, reference L is connected to the power line live end and reference N is connected to the power line neutral end.
The switching process of the two communication modes is as follows:
when the communication circuit 7 needs the signal PWM control, the diode D3 and the resistor R5 in fig. 5 are not welded, and the resistor R6 is welded, and at this time, the input port J3 is the PWM signal input port.
When the communication circuit 7 needs a mechanical variable frequency Drop-in control mode, for example, the resistor R2 in fig. 5 is not welded, the diode D3 and the resistor R5 are welded, and the input port J3 is a mechanical variable frequency Drop-in input port.
The embodiment is well compatible with two communication modes of PWM and Drop-in mechanical frequency conversion, and effectively reduces the intermediate links of frequency converter conversion of different communication modes, thereby meeting the communication modes required by different refrigerator control panels.
Of course, the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and it should be noted that any equivalent substitution, obvious modification made by those skilled in the art under the teaching of the present specification fall within the essential scope of the present specification, and the protection of the present invention should be protected.
Claims (7)
1. A power supply circuit includes an LN input circuit, a discharge circuit, and a rectifying-smoothing circuit; it is characterized in that the preparation method is characterized in that,
the LN input circuit comprises a thermistor and a thermistor short circuit;
the thermistor short circuit is connected to two ends of the thermistor, the thermistor is connected to the power circuit when the thermistor short circuit is in an off state, and the thermistor is in a short circuit when the thermistor short circuit is in an on state.
2. The power supply circuit according to claim 1,
the thermistor short circuit comprises a triode, a first resistor, a diode and a relay;
the triode is an NPN type triode; the base electrode end of the triode is a control signal input end, the emitter electrode end of the triode is grounded, and the collector electrode end of the triode is connected with one end of the first resistor and the positive electrode end of the diode;
the other end of the first resistor is connected with one end of an input loop of the relay;
the other end of the input loop of the relay and the negative end of the diode are connected with a positive voltage terminal;
each end of the output loop of the relay is correspondingly connected to one end of the thermistor.
3. The power supply circuit according to claim 1 or 2,
the LN input circuit further comprises a fuse, a piezoresistor and a power input port;
one end of the fuse, one end of the piezoresistor and one end of the thermistor are connected; the other end of the fuse and the other end of the piezoresistor are respectively connected to one connecting terminal of the power input port;
the other end of the thermistor and the other end of the piezoresistor are respectively connected to the discharge circuit.
4. The power supply circuit according to claim 3,
the LN input circuit further comprises a reactor interface;
the reactor interface is arranged on a connecting circuit between the piezoresistor and the discharge circuit.
5. The power supply circuit according to claim 4,
and an external reactor is connected to the reactor interface.
6. A frequency converter comprises a main control chip, a power circuit, a communication circuit, a feedback circuit and a driving circuit; a power supply circuit according to any one of claims 1 to 5, wherein the power supply circuit is used.
7. The frequency converter according to claim 6,
the communication circuit comprises a PWM signal input port and a mechanical variable frequency Drop-in input port; the PWM signal input port and the mechanical variable frequency Drop-in input port are connected into the communication circuit in an alternative mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221226308.4U CN217469754U (en) | 2022-05-20 | 2022-05-20 | Power supply circuit and frequency converter with same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202221226308.4U CN217469754U (en) | 2022-05-20 | 2022-05-20 | Power supply circuit and frequency converter with same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217469754U true CN217469754U (en) | 2022-09-20 |
Family
ID=83274637
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202221226308.4U Active CN217469754U (en) | 2022-05-20 | 2022-05-20 | Power supply circuit and frequency converter with same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN217469754U (en) |
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2022
- 2022-05-20 CN CN202221226308.4U patent/CN217469754U/en active Active
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