Power converter circuit

Abstract

The utility model provides a power converter circuit, which is characterized by comprising an on-off main control circuit, an AC-DC conversion circuit and a main control circuit, the on-off main control circuit comprises a bidirectional silicon controlled rectifier connected to a live wire, and a gate pole of the bidirectional silicon controlled rectifier is connected with the main control circuit so as to be controlled by the main control circuit to carry out on / off state switching; the AC-DC conversion circuit is connected with the bidirectional silicon controlled rectifier to take electricity and realize AC-DC voltage conversion; the main control circuit comprises a control chip for outputting a switching signal to a gate pole of the bidirectional silicon controlled rectifier; the gate pole of the bidirectional silicon controlled rectifier is further connected with a trigger circuit, the trigger circuit is provided with a first end connected with the live wire, a second end connected with the control chip and a third end connected with the gate pole of the bidirectional silicon controlled rectifier, and on-off control over the high-power bidirectional silicon controlled rectifier is achieved through the control chip. And the power regulation and electric response performance is better, and the requirement of large current passing is met.

Description

Technical Field

[0001] The utility model relates to a power converter circuit. Background Art

[0002] When passengers use electrical appliances in different countries and regions, they need to adapt to the local socket standards as well as the local power supply voltage. Most electrical appliances do not have the function of selecting power supply levels, and passengers will not bring two sets of electrical appliances for this reason. Therefore, it is necessary to have a power converter that can adapt and convert the AC voltage of different countries and regions. The power converter needs to meet the functions of voltage form conversion and power regulation. Most existing products only achieve step-up / step-down and AC / DC conversion, but do not have power regulation functions, which need to be optimized. Utility Model Content

[0003] A power converter circuit, characterized in that it comprises an on-off main control circuit, an AC-DC conversion circuit and a main control circuit;

[0004] The on / off main control circuit includes a bidirectional thyristor connected to the live wire, and the gate of the bidirectional thyristor is connected to the main control circuit to be controlled by the main control circuit to switch the on / off state;

[0005] The AC-DC conversion circuit is connected to a bidirectional thyristor to take power and realize AC-DC voltage conversion;

[0006] The main control circuit includes a control chip that outputs a switch signal to the gate of the bidirectional thyristor;

[0007] The gate of the bidirectional thyristor is also connected to a trigger circuit, which has a first end connected to the live wire, a second end connected to the control chip, and a third end connected to the gate of the bidirectional thyristor. The trigger circuit is authorized by the control chip to lower the level value of the above third end.

[0008] In one or more embodiments of the present invention, the trigger circuit includes a resistor R1 and a resistor R2 connected in series between the first end and the second end, and a connection point between the resistor R1 and the resistor R2 is connected to the third end.

[0009] In one or more embodiments of the utility model, the AC-DC conversion circuit includes a diode D1, a diode D2, a voltage regulator ZD1, a capacitor C1, an electrolytic capacitor EC5, a resistor R6, a resistor R7 and a resistor RL7. The voltage regulator ZD1, the electrolytic capacitor EC5 and the resistor RL7 are connected in parallel, with the positive electrode of the electrolytic capacitor EC5 as the DC output terminal VCC, and the negative electrode of the electrolytic capacitor EC5 is grounded; the negative electrode of the diode D1 is connected to the negative electrode of the voltage regulator ZD1, the positive electrode of the diode D1 is connected to the negative electrode of the diode D2, the positive electrode of the diode D2 is connected to the positive electrode of the voltage regulator ZD1, and the resistor R6 and the resistor R7 are connected in series, one end of which is connected to the positive electrode of the diode D1, and the other end is connected to the bidirectional thyristor.

[0010] In one or more embodiments of the present invention, the main control circuit further includes a thermistor, and the control chip has an over-temperature detection pin connected to the thermistor.

[0011] In one or more embodiments of the present invention, the main control circuit further includes a mode switching switch, and the control chip has a mode signal detection pin connected to the mode switching switch.

[0012] In one or more embodiments of the present invention, the resistor R4, the diode D3 and the resistor R12 are connected in series between the live wire and the ground terminal, and the mode switching switch is connected in series with the resistor R25 and then in parallel with the resistor R12.

[0013] Compared with the prior art, the superiority of the utility model is embodied in: the on-off control of the high-power bidirectional thyristor is realized by controlling the chip, which has better power regulation, electrical response performance and meets the demand for large current passing. At the same time, a chopper step-down circuit composed of a voltage regulator, a diode and an electrolytic capacitor is set up, which has the advantages of stable output, sufficient driving force, few circuit components and small size. It can easily realize 2000W chopping and is more suitable for application in power converters such as travel sockets. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The schematic diagram of the power converter circuit. DETAILED DESCRIPTION

[0015] The present application scheme is further described as follows in conjunction with the accompanying drawings:

[0016] See attached Figure 1 , the power converter circuit includes an on-off main control circuit, an AC-DC conversion circuit, a main control circuit and a trigger circuit;

[0017] The on / off main control circuit includes a bidirectional thyristor Q1 connected to the live wire, and the gate of the bidirectional thyristor Q1 is connected to the main control circuit to be controlled by the main control circuit to switch the on / off state;

[0018] The AC-DC conversion circuit is connected to the bidirectional thyristor Q1 to take power and realize AC-DC voltage conversion;

[0019] The main control circuit includes a control chip U1 that outputs a switch signal to the gate of the bidirectional thyristor Q1;

[0020] The trigger circuit has a first end connected to the live wire, a second end connected to the second pin (IO-SRC) of the control chip U1, and a third end connected to the gate of the bidirectional thyristor Q1. The trigger circuit is authorized by the control chip U1 to lower the level value of the third end. Specifically, the trigger circuit includes a resistor R1 and a resistor R2 connected in series between the first end and the second end. The connection point of the resistor R1 and the resistor R2 is connected to the third end. When the live wire is energized, the level of the third end is pulled up, so that the bidirectional thyristor Q1 is turned on. The control chip U1 outputs a low level through the second pin (IO-SRC) to pull down the level of the third end to disconnect the bidirectional thyristor Q1, thereby realizing on / off control and then adjusting the electric power.

[0021] The AC-DC conversion circuit includes a diode D1, a diode D2, a voltage regulator ZD1, a capacitor C1, an electrolytic capacitor EC5, a resistor R6, a resistor R7 and a resistor RL7. The voltage regulator ZD1, the electrolytic capacitor EC5 and the resistor RL7 are connected in parallel, with the positive electrode of the electrolytic capacitor EC5 as the DC output terminal VCC, and the negative electrode of the electrolytic capacitor EC5 is grounded; the negative electrode of the diode D1 is connected to the negative electrode of the voltage regulator ZD1, the positive electrode of the diode D1 is connected to the negative electrode of the diode D2, the positive electrode of the diode D2 is connected to the positive electrode of the voltage regulator ZD1, the resistor R6 and the resistor R7 are connected in series, one end of which is connected to the positive electrode of the diode D1, and the other end is connected to the bidirectional thyristor Q1 for power supply, and the capacitor C1 is connected in parallel to the two ends of the resistor R6. When the bidirectional thyristor Q1 is turned on, the AC-DC conversion circuit takes power through the resistors R6 and R7, and the power is rectified by the diodes D1 and D2 to charge the electrolytic capacitor EC5. The adjustable chopping parameters are set according to the capacity of the electrolytic capacitor EC5. The rectified DC voltage is applied to the trigger circuit as a bias voltage.

[0022] The main control circuit also includes a thermistor PTC1. The control chip U1 has an over-temperature detection pin (i.e., pin 4) connected to the thermistor PTC1 for detecting the real-time temperature of the device. When an over-temperature condition occurs, the control chip U1 will disconnect the bidirectional thyristor Q1.

[0023] The main control circuit also includes a mode switching switch S1, and the control chip U1 has a mode signal detection pin (i.e., pin 7) connected to the mode switching switch S1. Specifically, the resistor R4, the diode D3, and the resistor R12 are connected in series between the live wire and the ground terminal in sequence, the mode switching switch S1 is connected in series with the resistor R25 and then connected in parallel with the resistor R12, and the cathode of the diode D3 is connected to the mode signal detection pin. After the mode switching switch S1 is closed, the resistor R25 and the resistor R12 are connected in parallel to change the level value at the mode signal detection pin, and the control chip U1 controls the switching frequency of the bidirectional thyristor Q1 according to the different level values.

[0024] This circuit uses the control chip U1 to achieve on-off control of the high-power bidirectional thyristor Q1, has better power regulation, electrical response performance and meets the needs of large current passing. At the same time, a chopping and step-down circuit structure composed of a voltage regulator ZD1, diodes D1, D2 and an electrolytic capacitor EC5 is set up. It has the advantages of stable output, sufficient driving force, few circuit components, and small size. It can easily achieve 2000W chopping and is more suitable for application in power converters such as travel sockets.

[0025] The above-mentioned preferred implementation modes should be regarded as illustrative examples of the implementation modes of the present application scheme. Any technical deductions, replacements, improvements, etc. that are identical or similar to the present application scheme or made based on this scheme should be regarded as within the scope of protection of this patent.

Claims

1. A power converter circuit, characterized in that: It includes a main on-off control circuit, an AC-DC conversion circuit and a main control circuit; The on / off main control circuit includes a bidirectional thyristor connected to the live wire, and the gate of the bidirectional thyristor is connected to the main control circuit to be controlled by the main control circuit to switch the on / off state; The AC-DC conversion circuit is connected to a bidirectional thyristor to take power and realize AC-DC voltage conversion; The main control circuit includes a control chip that outputs a switch signal to the gate of the bidirectional thyristor; The gate of the bidirectional thyristor is also connected to a trigger circuit, which has a first end connected to the live wire, a second end connected to the control chip, and a third end connected to the gate of the bidirectional thyristor. The trigger circuit is authorized by the control chip to lower the level value of the above third end.

2. The power converter circuit according to claim 1, wherein: The trigger circuit includes a resistor R1 and a resistor R2 connected in series between the first end and the second end, and a connection point between the resistor R1 and the resistor R2 is connected to the third end.

3. The power converter circuit according to claim 1, wherein: The AC-DC conversion circuit includes a diode D1, a diode D2, a voltage regulator ZD1, a capacitor C1, an electrolytic capacitor EC5, a resistor R6, a resistor R7 and a resistor RL7. The voltage regulator ZD1, the electrolytic capacitor EC5 and the resistor RL7 are connected in parallel, with the positive electrode of the electrolytic capacitor EC5 as the DC output terminal VCC, and the negative electrode of the electrolytic capacitor EC5 is grounded; the negative electrode of the diode D1 is connected to the negative electrode of the voltage regulator ZD1, the positive electrode of the diode D1 is connected to the negative electrode of the diode D2, the positive electrode of the diode D2 is connected to the positive electrode of the voltage regulator ZD1, and the resistor R6 and the resistor R7 are connected in series, with one end connected to the positive electrode of the diode D1 and the other end connected to the bidirectional thyristor.

4. The power converter circuit according to claim 1, wherein: The main control circuit also includes a thermistor, and the control chip has an over-temperature detection pin connected to the thermistor.

5. The power converter circuit according to claim 1, wherein: The main control circuit also includes a mode switching switch, and the control chip has a mode signal detection pin connected to the mode switching switch.

6. The power converter circuit according to claim 5, characterized in that: The resistor R4, the diode D3 and the resistor R12 are connected in series between the live wire and the ground terminal. The mode switching switch is connected in series with the resistor R25 and then in parallel with the resistor R12.

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