Power supply conversion device
阅读说明:本技术 电源转换装置 (Power supply conversion device ) 是由 蔡宪逸 阙百淞 于 2019-03-22 设计创作,主要内容包括:电源转换装置用以接收并转换一交流电源为一直流电,该电源转换装置包括一检测电路及一位准判断电路。检测电路包括一对隔离组件、及一分压电路,该对隔离组件的光发射元件反向并联后并联于该交流电源,该对光发射元件分别在交流电源的正负半周时导通。该对隔离组件的光接收元件同向并联后串联于一电源及该分压电路之间,该对光接收元件在对应的该光发射元件导通时导通并使得该分压电路输出一第一电压,该位准判断电路比较第一电压与一参考位准,以选择性输出一异常信号。(The power conversion device is used for receiving and converting an alternating current power supply into a direct current power supply and comprises a detection circuit and a level judgment circuit. The detection circuit comprises a pair of isolation components and a voltage division circuit, wherein light emitting elements of the isolation components are reversely connected in parallel and then connected in parallel with the alternating current power supply, and the light emitting elements are conducted respectively at positive and negative half cycles of the alternating current power supply. The light receiving elements of the isolation components are connected in parallel in the same direction and then connected in series between a power supply and the voltage division circuit, the light receiving elements are conducted when the corresponding light emitting elements are conducted, the voltage division circuit outputs a first voltage, and the level judgment circuit compares the first voltage with a reference level to selectively output an abnormal signal.)
1. A power conversion apparatus, comprising:
a primary side circuit having a first input terminal and a second input terminal, the primary side circuit being adapted to receive and convert an ac power source into a primary side output;
a transformer circuit for receiving the primary side output;
a detection circuit, comprising:
a first isolation assembly, including a first light emitting device and a first light receiving device, wherein when the first light emitting device is conducted, the first light receiving device is conducted, and when the first light emitting device is not conducted, the first light receiving device is not conducted;
a second isolation assembly, including a second light emitting device and a second light receiving device, when the second light emitting device is conducted, the second light receiving device is conducted, when the second light emitting device is not conducted, the second light receiving device is not conducted, the first light emitting device and the second light emitting device are reversely parallel connected and have a first anti-parallel point and a second anti-parallel point, the first anti-parallel point is electrically connected with the first input end, the first light receiving device and the second light receiving device are parallel connected in the same direction and have a first parallel point and a second parallel point, the first parallel point is electrically connected to a direct current power supply;
a current limiting circuit having two terminals electrically connected to the second anti-parallel point and the second input terminal respectively;
a voltage dividing circuit having a first terminal, a voltage dividing point and a second terminal, wherein the first terminal is electrically connected to the second common point; and
a capacitor electrically connected to the first terminal and the second terminal, the capacitor storing a capacitor voltage when the first light receiving element or the second light receiving element is turned on, the capacitor releasing the capacitor voltage and generating a first voltage between the voltage dividing point and the second terminal when the first light receiving element and the second light receiving element are turned off; and
a level judging circuit having a first contact, a reference level and an output end, wherein the first contact receives the first voltage, and the level judging circuit compares the first voltage with the reference level to selectively output an abnormal signal from the output end.
2. The power conversion device of claim 1, wherein the current limiting circuit comprises:
at least one resistor and at least one capacitor connected in series in sequence, wherein one end of the resistor is electrically connected with the second anti-parallel point, and one end of the capacitor is electrically connected with the second input end.
3. The power conversion device of claim 1, wherein the voltage divider circuit comprises:
the first resistor and the second resistor are connected in series in sequence, and the first resistor and the second resistor which are connected in series are connected in parallel with the capacitor.
4. The power conversion device according to any one of claims 1 to 3, wherein the level determination circuit comprises:
a pre-resistor; and
one end of the pre-resistor is connected with the DC power supply, the other end of the pre-resistor is connected with the comparison element, the comparison element enables the level judgment circuit to output the abnormal signal when the first voltage is smaller than the reference level, and the comparison element enables the level judgment circuit not to output the abnormal signal when the first voltage is not smaller than the reference level.
5. A power conversion apparatus, comprising:
a primary side circuit having two input terminals, the primary side circuit being adapted to receive an ac power from the two input terminals and to rectify the ac power to output a primary side output;
a voltage transformation circuit for receiving the primary side output;
an isolation circuit, which is connected with the two input ends in parallel to detect a power state of the alternating current power supply, transmits a conducting signal when the power state is power supply, and does not transmit the conducting signal when the power state is power off;
a coupling circuit, when the isolation circuit transmits the conducting signal, the isolation circuit optically couples the coupling circuit to enable the coupling circuit to generate a capacitance voltage, and when the isolation circuit does not transmit the conducting signal, the isolation circuit electrically isolates the coupling circuit to enable the coupling circuit to generate a first voltage by dividing the capacitance voltage; and
a level judging circuit having a reference level, the level judging circuit being adapted to compare the first voltage with the reference level to selectively output an abnormal signal from the output terminal.
6. The power conversion device of claim 5, wherein the isolation circuit comprises:
a first light emitting element; and
a second light emitting element connected in reverse parallel to the first light emitting element.
7. The power conversion device of claim 6, wherein the coupling circuit comprises:
a first light receiving element optically coupled to the first light emitting element, wherein the first light emitting element and the first light receiving element are integrated into a first isolation assembly;
a second light receiving element connected in parallel with the first light receiving element in the same phase, the second light receiving element optically coupling the second light emitting element, and the second light emitting element and the second light receiving element being integrated into a second isolation assembly;
a capacitor connected in series with the second light receiving element for storing the capacitor voltage; and
a voltage divider circuit for dividing the capacitor voltage to generate the first voltage.
8. The power conversion device according to any one of claims 5 to 7, wherein the level determination circuit comprises:
a pre-resistor; and
one end of the pre-resistor is connected with the DC power supply, the other end of the pre-resistor is connected with the comparison element, the comparison element enables the level judgment circuit to output the abnormal signal when the first voltage is smaller than the reference level, and the comparison element enables the level judgment circuit not to output the abnormal signal when the first voltage is not smaller than the reference level.
Technical Field
The present invention relates to a power conversion device, and more particularly, to a power conversion device with a detection circuit.
Background
Currently, detecting the power state of the input voltage of the power supply is to configure an optocoupler and a control circuit coupled to the optocoupler at the primary side of the power supply. The optical coupler is used for detecting the power state of the input voltage, and the control circuit judges whether the power supply supplies power to the load or not according to the power state. If so, the power supply can supply power to the load; if not, the power supply can inform the load, so that the load can carry out the prepositive operation before shutdown.
However, if the power state of the input voltage is power-off, the optocoupler does not detect the power state of the input voltage, and the control circuit misjudges that the power supply supplies power to the load device. For example, when the power state is power, the input voltage is an ac voltage having a positive half cycle amplitude and a negative half cycle amplitude. The optocoupler is turned on at positive half cycle amplitude and is turned off at negative half cycle amplitude or when the ac voltage is off. If the alternating voltage is cut off when the amplitude is positive half cycle, the optical coupler can detect the cut-off in time because the optical coupler is not conducted; if the AC voltage is cut off at the negative half-cycle amplitude, the control circuit cannot know whether the optical coupler is not conducted because the AC voltage is at the negative half-cycle amplitude or because the AC voltage is cut off, and therefore the control circuit cannot detect the cut-off in time, and the control circuit delays to inform the load to carry out the prepositive operation before shutdown. Therefore, when the ac voltage is at negative half cycle amplitude, the control circuit cannot timely notify the load to perform the pre-operation before shutdown.
Disclosure of Invention
In view of the above problems, the present invention provides a power conversion device for detecting the power state of an ac power source in time and sending an abnormal signal to an external control circuit when the power state is power off, so as to facilitate the external control circuit to perform a pre-operation before the external control circuit shuts down a load or an external electronic device.
According to some embodiments, the power conversion apparatus includes a primary side circuit, a transformer circuit, a detection circuit and a level determination circuit. The primary side circuit is suitable for receiving and converting an alternating current power supply into a primary side output and is provided with a first input end and a second input end. The transformer circuit is used for receiving the primary side output. The detection circuit comprises a first isolation component, a second isolation component, a current limiting circuit, a voltage dividing circuit and a capacitor. The first isolation assembly comprises a first light emitting element and a first light receiving element, wherein when the first light emitting element is conducted, the first light receiving element is conducted, and when the first light emitting element is not conducted, the first light receiving element is not conducted. The second isolation component comprises a second light emitting element and a second light receiving element, when the second light emitting element is conducted, the second light receiving element is conducted, when the second light emitting element is not conducted, the second light receiving element is not conducted, the first light emitting element and the second light emitting element are reversely connected in parallel and are provided with a first anti-parallel point and a second anti-parallel point, the first anti-parallel point is electrically connected with the first input end, the first light receiving element and the second light receiving element are connected in parallel in the same direction and are provided with a first parallel point and a second parallel point, and the first parallel point is electrically connected to a direct current power supply. The current limiting circuit has two terminals electrically connected to the second anti-parallel point and the second input terminal respectively. The voltage division circuit is provided with a first end point, a voltage division point and a second end point, wherein the first end point is electrically connected to the second coincidence point. The capacitor is electrically connected with the first end point and the second end point, stores a capacitor voltage when the first light receiving element or the second light receiving element is conducted, releases the capacitor voltage when the first light receiving element and the second light receiving element are not conducted, and generates a first voltage between the voltage dividing point and the second end point. The level judging circuit has a first contact, a reference level and an output end, the first contact receives the first voltage, the level judging circuit compares the first voltage with the reference level to selectively output an abnormal signal from the output end.
According to some embodiments, the current limiting circuit includes at least one resistor and at least one capacitor connected in series in sequence, one end of the resistor is electrically connected to the second anti-parallel point, and one end of the capacitor is electrically connected to the second input terminal.
According to some embodiments, the voltage divider circuit comprises a first resistor and a second resistor connected in series in sequence, and the first resistor and the second resistor connected in series are connected in parallel with the capacitor.
According to some embodiments, the level determining circuit includes a pre-resistor and a comparing element, one end of the pre-resistor is connected to the dc power source, the other end of the pre-resistor is connected to the comparing element, the comparing element enables the level determining circuit to output the abnormal signal when the first voltage is smaller than the reference level, and the comparing element enables the level determining circuit not to output the abnormal signal when the first voltage is not smaller than the reference level.
The invention further provides a power conversion device, which includes a primary side circuit, a transformer circuit, an isolation circuit, a coupling circuit and a level judgment circuit. The primary side circuit is provided with two input ends, and the primary side circuit is suitable for receiving an alternating current power supply from the two input ends and rectifying the alternating current power supply to output a primary side output. The transformer circuit is used for receiving the primary side output. The isolation circuit is connected in parallel with the two input ends to detect a power state of the alternating current power supply, and transmits a conducting signal when the power state is power supply. The isolation circuit does not transmit the conducting signal when the power state is power-off. When the isolation circuit transmits the conducting signal, the isolation circuit optically couples the coupling circuit to enable the coupling circuit to generate a capacitor voltage, and when the isolation circuit does not transmit the conducting signal, the isolation circuit electrically isolates the coupling circuit and enables the coupling circuit to generate a first voltage by dividing the capacitor voltage. The level judging circuit is provided with a reference level, and the level judging circuit is suitable for comparing the first voltage with the reference level and selectively outputting an abnormal signal from the output end.
According to some embodiments, the isolation circuit comprises a first light emitting element and a second light emitting element. The light second emitting element is connected in reverse parallel with the first emitting element.
According to some embodiments, the coupling circuit comprises a first light receiving element, a second light receiving element, a capacitor, and a first resistor and a second resistor connected in series in sequence. The first light receiving element is optically coupled with the first light emitting element, and the first light emitting element and the first light receiving element are integrated into a first isolation component. The second receiving element is connected in parallel with the first receiving element in the same phase, the second receiving element is optically coupled with the second light emitting element, and the second light emitting element and the second receiving element are integrated into a second isolation component. The capacitor is connected in series with the second light receiving element to store the capacitor voltage. One end of the first resistor is electrically connected with one end of the capacitor, one end of the second resistor is electrically connected with the other end of the capacitor, and when the capacitor releases the capacitor voltage, the capacitor voltage is divided by the first resistor and the second resistor so that the second resistor generates the first voltage.
Drawings
Fig. 1 is a schematic circuit block diagram of a power conversion device according to some embodiments.
Fig. 2 is a schematic circuit block diagram of a power conversion device according to some embodiments.
Wherein the reference numerals are:
10 power supply conversion device 11 primary side circuit
110
114. 116 input terminal 12 transformation circuit
13
17
30 load 40 detection circuit
410
415 Current limiting
42a, 44a
44
431. 432 first and
436
439
452
452c cathode/
454 dc power supply with pre-resistor 46
50 external control circuit R1 first resistor
R2 second resistor Vref reference level
Detailed Description
Fig. 1 is a block diagram of a power conversion apparatus 10 according to some embodiments of the invention. Fig. 2 is a block diagram of a power conversion apparatus 10 according to some embodiments. The Power conversion device 10 is used for converting an ac Power output by an ac Power supply (Alternating Power supply) 20 into a dc Power and outputting the dc Power to a
The aforementioned ac
Referring to fig. 1, the power conversion apparatus 10 includes a primary side circuit 11, a transformer circuit 12, a detection circuit 40, and a
The primary side circuit 11 has two
In some embodiments, the primary side circuit 11 includes a
The detection circuit 40 detects a power state of the ac power source from the two
Referring to fig. 2, in some embodiments, the detection circuit 40 includes a
The
Specifically, the first
The detection circuit 40 includes an
The
The
The
The
The
Therefore, when the ac
The
Referring to fig. 2, the
Continuing with the operation of the
When the ac
In some embodiments, in order to adjust the time when the detection circuit 40 sends the abnormal signal when the ac
The anti-parallel connection means that the anode of the first
In summary, the power conversion apparatus 10 according to one or more embodiments of the present invention can detect the power state of the ac power source, and send an abnormal signal to the
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made by those skilled in the art without departing from the spirit of the invention.
- 上一篇:一种医用注射器针头装配设备
- 下一篇:一种应用于电网产品的高效率CT取电电路