CN215529355U - Induction heating power regulation control circuit - Google Patents
Induction heating power regulation control circuit Download PDFInfo
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- CN215529355U CN215529355U CN202121297267.3U CN202121297267U CN215529355U CN 215529355 U CN215529355 U CN 215529355U CN 202121297267 U CN202121297267 U CN 202121297267U CN 215529355 U CN215529355 U CN 215529355U
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Abstract
The utility model discloses an induction heating power regulation control circuit, which belongs to the technical field of resonance induction heating equipment and comprises a signal input end, a square wave generating circuit, an exclusive or circuit, an integrating circuit, a voltage forming circuit and a trigger signal forming circuit which are coupled in sequence; the utility model utilizes the intermediate frequency current signal of the resonance main loop of the series resonance induction heating equipment to form a square wave, the square wave is compared with the phase of the inversion control signal square wave generated by the utility model to obtain a corresponding duty ratio signal, the duty ratio signal is converted into a voltage analog signal through an integrating circuit, the voltage analog signal is used as the feedback quantity of power PI regulation and is added with a negative pressure signal with given power, and the formed voltage-controlled voltage forms a circuit through a trigger signal, so that the required trigger signal can be obtained, the excitation frequency of the resonance main loop of the series resonance induction heating equipment can be changed, and the purpose of power regulation is achieved.
Description
Technical Field
The utility model relates to the technical field of resonant induction heating equipment, in particular to an induction heating power regulation control circuit.
Background
When the series resonance induction heating equipment is used, the state of the actual load of the series resonance induction heating equipment is changed constantly, the amplitude of intermediate-frequency current or intermediate-frequency voltage is usually used as feedback of PI regulation by a traditional control circuit, and the change of the feedback signal formed by the control circuit can be caused due to the change of the state of the load constantly, so that the actual power output of the series resonance induction heating equipment is influenced, and the power of the series resonance induction heating equipment can not be effectively and linearly controlled.
SUMMERY OF THE UTILITY MODEL
For the problems in the prior art, the utility model provides an induction heating power regulation control circuit, which forms a square wave by using an intermediate-frequency current signal of a resonance main loop of series resonance induction heating equipment, performs phase comparison with a resonance trigger square wave signal generated by the utility model to obtain a corresponding duty ratio signal, converts the duty ratio signal into a voltage analog signal through an integrating circuit, performs addition operation on the voltage analog signal and a negative voltage signal given by power, and forms a voltage-controlled voltage through a trigger signal forming circuit, so that a required trigger signal can be obtained, the excitation frequency of the resonance main loop of the series resonance induction heating equipment can be changed, and the purpose of power regulation is achieved.
In order to achieve the purpose, the technical scheme adopted by the utility model is as follows:
an induction heating power regulation control circuit comprises a signal input end, a square wave generating circuit, an exclusive OR circuit, an integrating circuit, a voltage forming circuit and a trigger signal forming circuit which are coupled in sequence; the exclusive-or circuit has a first input terminal and a second input terminal, the voltage forming circuit has a third input terminal, and the trigger signal forming circuit has a first output terminal and a second output terminal; the output end of the square wave generating circuit is coupled with the first input end, the output end of the integrating circuit is coupled with the third input end, the third input end is coupled with an input voltage end, the first output end is coupled with a resonant main loop, and the second output end is coupled with the second input end.
As a preferred technical solution, the signal at the signal input terminal is an intermediate frequency sinusoidal current signal, and the signal input terminal is coupled to the resonant main loop.
As a preferred technical solution, the square wave generating circuit includes a first operational amplifier, a first capacitor, a second operational amplifier, a first not gate and a second not gate, which are coupled in sequence; the signal input is coupled to an inverting input of the first operational amplifier.
As a preferred technical solution, the xor circuit includes an xor gate and a third not gate coupled in sequence; the first input terminal and the second input terminal are both inputs of the exclusive or gate, and an output terminal of the second not gate is coupled to the first input terminal.
As a preferred technical solution, the integrating circuit includes a third operational amplifier and a fourth operational amplifier coupled in sequence; an output of the third not gate is coupled to an inverting input of the third operational amplifier.
As a preferred technical solution, the voltage forming circuit includes a fifth operational amplifier and a sixth operational amplifier coupled in sequence; the third input terminal is set as an inverting input terminal of the fifth operational amplifier, and the output terminal and the input voltage terminal of the fourth operational amplifier are both coupled to the inverting input terminal of the fifth operational amplifier.
As a preferred technical solution, the trigger signal forming circuit includes a voltage-to-frequency converter, a fourth not gate and an edge trigger, which are coupled in sequence; an output end of the sixth operational amplifier is coupled to an input port of the voltage-to-frequency converter, and the first output end and the second output end are both outputs of the edge flip-flop.
As a preferred technical solution, diodes are coupled between the output end of the fourth operational amplifier and the third input end, and between the output end of the sixth operational amplifier and the input port of the voltage-to-frequency converter.
The beneficial effects of the utility model are as follows:
the utility model utilizes the intermediate frequency current signal of the resonance main loop of the series resonance induction heating equipment to form a square wave, the square wave is compared with the phase of the inversion control signal square wave generated by the utility model to obtain a corresponding duty ratio signal, the duty ratio signal is converted into a voltage analog signal through an integrating circuit, the voltage analog signal is used as the feedback quantity of power PI regulation and is added with a negative pressure signal with given power, and the formed voltage-controlled voltage forms a circuit through a trigger signal, so that the required trigger signal can be obtained, the excitation frequency of the resonance main loop of the series resonance induction heating equipment can be changed, and the purpose of power regulation is achieved.
Drawings
Fig. 1 is a circuit diagram of an embodiment of an induction heating power regulation control circuit according to the present invention.
Detailed Description
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 1, an embodiment of an induction heating power regulation control circuit according to the present invention includes a signal input terminal (CZ1), a square wave generating circuit, an exclusive or circuit, an integrating circuit, a voltage forming circuit, and a trigger signal forming circuit, which are coupled in sequence; the exclusive-or circuit is provided with a first input end and a second input end, the voltage forming circuit is provided with a third input end, and the trigger signal forming circuit is provided with a first output end and a second output end; the output end of the square wave generating circuit is coupled with the first input end, the output end of the integrating circuit is coupled with the third input end, the third input end is coupled with an input voltage end (Vk), the output power of the input voltage end (Vk) is adjusted and controlled to input negative voltage, the first output end is coupled with a resonant main loop, and the first output end outputs a trigger signal of the resonant main loop; the second output terminal is coupled with the second input terminal; specifically, the signal of the signal input end (CZ1) is an intermediate frequency sinusoidal current signal, the signal input end (CZ1) is coupled with the resonant main loop, the intermediate frequency sinusoidal current signal forms a common frequency square wave (Wf) through a square wave generating circuit, the common frequency square wave (Wf) and the resonant trigger square wave signal (OUT1) formed by the utility model form a DUTY ratio signal (DUTY-C) through an exclusive or circuit, the DUTY ratio signal (DUTY-C) forms a voltage analog signal (Vf) through an integrating circuit, the voltage analog signal (Vf) and the power of the input voltage end (Vk) adjust and control the input negative voltage (0-8V) to form a voltage-controlled square wave Voltage (VCO) through a voltage forming circuit, the voltage-controlled square wave Voltage (VCO) forms a trigger signal (OUT2) and a resonant trigger signal (OUT1) through the trigger signal forming circuit, the trigger signal (OUT2) can change the excitation frequency of the resonant main loop of the series resonant induction heating equipment, the purpose of power regulation is achieved.
It should be noted that, in the present invention, the DUTY ratio signal (DUTY-C) obtained by comparing the resonant triggered square wave signal (OUT1) with the same-frequency square wave (Wf) is used as the feedback signal of the power regulation control circuit, and the intensity of the feedback signal is directly related to the power factor of the resonant main loop, so as to effectively avoid the problem that the power is difficult to be effectively linearly controlled due to the load changing at any time during the operation of the induction heating system.
In this embodiment, referring to fig. 1, the square wave generating circuit includes a first operational amplifier (U3B), a first capacitor (C1), a second operational amplifier (U4B), a first not gate (U1B), and a second not gate (U2E) coupled in sequence; a signal input (CZ1) coupled to the inverting input of the first operational amplifier; specifically, a plurality of diodes (D1, D2, Z2, Z3) are coupled between the signal input end (CZ1) and the first operational amplifier (U3B), so that the signal of the signal input end (CZ1) can be sampled and limited, the signal can be integrated by the first operational amplifier (U3B) to form a triangular wave, and the triangular wave can be coupled by the first capacitor (C1) and then form a common-frequency square wave (Wf) by the second operational amplifier (U4B), the first not gate (U1B) and the second not gate (U2E).
In this embodiment, referring to fig. 1, the xor circuit includes an xor gate (U5B) and a third not gate (U6D) coupled in sequence; the first input end and the second input end are both inputs of an exclusive-or gate (U5B), and the output end of a second NOT gate (U2E) is coupled with the first input end; and the same-frequency square wave (Wf) and the resonance trigger square wave signal (OUT1) are subjected to exclusive OR operation through an exclusive OR circuit to obtain a DUTY ratio signal (DUTY-C) related to the power factor of the resonance main loop.
In the present embodiment, referring to fig. 1, the integrating circuit includes a third operational amplifier (U11B) and a fourth operational amplifier (U11A) coupled in sequence; an output of the third not-gate (U6D) is coupled to an inverting input of a third operational amplifier (U11B); the DUTY ratio signal (DUTY-C) is integrated and amplified by a third operational amplifier (U11B) and a fourth operational amplifier (U11A) to form a voltage analog signal (Vf).
In the present embodiment, referring to fig. 1, the voltage forming circuit includes a fifth operational amplifier (U10A) and a sixth operational amplifier (U10B) coupled in sequence; the third input is set as the inverting input of a fifth operational amplifier (U10A), the output and the input voltage terminal (Vk) of the fourth operational amplifier (U11A) are both coupled to the inverting input of the fifth operational amplifier (U10A); the voltage analog signal (Vf) and the power regulation control input negative voltage of the input voltage terminal (Vk) are added, and then a voltage-controlled Voltage (VCO) is formed through a fifth operational amplifier (U10A) and a sixth operational amplifier (U10B).
In this embodiment, referring to fig. 1, the trigger signal forming circuit includes a voltage-to-frequency converter (U9), a fourth not gate (U8F), and an edge flip-flop (U7) coupled in sequence; an output end of the sixth operational amplifier (U10B) is coupled with an input port of the voltage-frequency converter (U9), and a first output end and a second output end are both outputs of the edge trigger (U7); the voltage-controlled Voltage (VCO) controls the output of the voltage-to-frequency converter (U9), and the output of the voltage-to-frequency converter (U9) passes through the edge flip-flop (U7) to form two signals with opposite phases: the circuit forms a trigger signal (OUT2) and a resonant trigger square wave signal (OUT1), the circuit forms the trigger signal (OUT2) as a trigger signal of a resonant main loop, and the resonant trigger square wave signal (OUT1) is a comparison signal with a common-frequency square wave (Wf).
In the present embodiment, referring to fig. 1, diodes (D5, D4) are coupled between the output terminal and the third input terminal of the fourth operational amplifier (U11A) and between the output terminal of the sixth operational amplifier (U10B) and the input port of the voltage-to-frequency converter (U9), and the diodes (D5, D4) function to rectify and stabilize the voltage.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An induction heating power regulation control circuit is characterized by comprising a signal input end, a square wave generating circuit, an exclusive or circuit, an integrating circuit, a voltage forming circuit and a trigger signal forming circuit which are sequentially coupled; the exclusive-or circuit has a first input terminal and a second input terminal, the voltage forming circuit has a third input terminal, and the trigger signal forming circuit has a first output terminal and a second output terminal; the output end of the square wave generating circuit is coupled with the first input end, the output end of the integrating circuit is coupled with the third input end, the third input end is coupled with an input voltage end, the first output end is coupled with a resonant main loop, and the second output end is coupled with the second input end.
2. An induction heating power conditioning control circuit as claimed in claim 1 wherein the signal at said signal input is an intermediate frequency sinusoidal current signal, said signal input being coupled to said resonant main circuit.
3. The induction heating power regulation control circuit according to claim 1 or 2, wherein the square wave generation circuit comprises a first operational amplifier, a first capacitor, a second operational amplifier, a first not gate and a second not gate which are coupled in sequence; the signal input is coupled to an inverting input of the first operational amplifier.
4. An induction heating power regulation control circuit as claimed in claim 3 wherein the exclusive or circuit comprises an exclusive or gate and a third not gate coupled in series; the first input terminal and the second input terminal are both inputs of the exclusive or gate, and an output terminal of the second not gate is coupled to the first input terminal.
5. The induction heating power regulation control circuit of claim 4 wherein the integration circuit comprises a third operational amplifier and a fourth operational amplifier coupled in series; an output of the third not gate is coupled to an inverting input of the third operational amplifier.
6. The induction heating power regulation control circuit of claim 5 wherein the voltage forming circuit comprises a fifth operational amplifier and a sixth operational amplifier coupled in series; the third input terminal is set as an inverting input terminal of the fifth operational amplifier, and the output terminal and the input voltage terminal of the fourth operational amplifier are both coupled to the inverting input terminal of the fifth operational amplifier.
7. The induction heating power regulation control circuit of claim 6 wherein the trigger signal forming circuit comprises a voltage to frequency converter, a fourth not gate and an edge trigger coupled in sequence; an output end of the sixth operational amplifier is coupled to an input port of the voltage-to-frequency converter, and the first output end and the second output end are both outputs of the edge flip-flop.
8. The induction heating power regulation control circuit of claim 7 wherein a diode is coupled between the output of the fourth operational amplifier and the third input and between the output of the sixth operational amplifier and the input of the voltage to frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121297267.3U CN215529355U (en) | 2021-06-10 | 2021-06-10 | Induction heating power regulation control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121297267.3U CN215529355U (en) | 2021-06-10 | 2021-06-10 | Induction heating power regulation control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215529355U true CN215529355U (en) | 2022-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121297267.3U Active CN215529355U (en) | 2021-06-10 | 2021-06-10 | Induction heating power regulation control circuit |
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|---|---|
| CN (1) | CN215529355U (en) |
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2021
- 2021-06-10 CN CN202121297267.3U patent/CN215529355U/en active Active
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| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An induction heating power regulation control circuit Effective date of registration: 20230322 Granted publication date: 20220114 Pledgee: HIMILE GROUP Co.,Ltd. Pledgor: SHANDONG RONGTAI INDUCTION TECHNOLOGY Co.,Ltd. Registration number: Y2023980035464 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |