CN210629369U

CN210629369U - Circuit for simultaneously realizing power supply and voltage detection by utilizing one output winding

Info

Publication number: CN210629369U
Application number: CN201922217317.1U
Authority: CN
Inventors: 杨丰旺
Original assignee: Jiangmen Puzhou Lighting Co Ltd
Current assignee: Jiangmen Puzhou Lighting Co Ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-05-26
Anticipated expiration: 2029-12-12

Abstract

The utility model discloses an utilize output winding to realize power supply and voltage detection's circuit simultaneously, including utilizing an output winding to realize power supply and voltage detection's circuit simultaneously, including power frequency alternating current VIN, power frequency alternating current VIN becomes 300V high-voltage direct current VDC through diode D1, D2, D6, D7, C3 rectification filter back, high-voltage direct current VDC is through flyback high frequency switch U1 and flyback high frequency transformer N1 transform back flyback high frequency transformer N2 winding output low pressure high frequency rectification electricity. The utility model relates to a voltage detection technical field, this utilize output winding to realize power supply and voltage detection's circuit simultaneously, through utilizing a low pressure side winding N2, 2 rectifier diodes D4, D8, 2 individual filter capacitance C2, C4, both realized low pressure DC power supply VOUT, realize again that the isolation to high pressure side input voltage VIN detects to can simplify high frequency transformer's coiling, reduce circuit cost.

Description

Circuit for simultaneously realizing power supply and voltage detection by utilizing one output winding

Technical Field

The utility model relates to a voltage detection technical field specifically is a circuit that utilizes an output winding to realize power supply and voltage detection simultaneously.

Background

The power is converted into an isolated buck-type switching power supply with a flyback topology, and a low-voltage side circuit of the switching power supply needs to realize detection of an input voltage at a high-voltage side at low cost.

The invention patent of patent application publication No. CN105467193B discloses a voltage detection circuit, including a self-bias current source generation circuit, which includes a first bipolar transistor and a first resistor, generates a bias current based on a base-emitter voltage of the first bipolar transistor and the first resistor, and generates a bias voltage based on the bias current; a second circuit portion comprising: a fourth transistor, a fifth transistor, a second bipolar transistor, a third bipolar transistor, a second resistor, a third resistor, a fourth resistor, a first switch, a second switch, a third switch, a fourth switch, a fifth switch and a sixth switch, wherein the gate of the fourth transistor is connected to the bias voltage, the source thereof is connected to the input voltage, the drain thereof is connected to the second node in common with the bases of the second bipolar transistor and the third bipolar transistor, the second resistor and the third switch are connected in parallel between the second node and the first node, the drain of the fifth transistor is connected to the first node, the source thereof is connected to the ground terminal, the gate thereof is connected to the detection voltage VM through the second switch, and the first switch is connected between the gate of the fifth transistor and the ground terminal; collectors of the second bipolar transistor and the third bipolar transistor are connected to the input voltage, an emitter of the second bipolar transistor is connected to the third node through a fourth switch, an emitter of the third bipolar transistor is connected to the third node through a fifth switch, the third resistor and the fourth resistor are connected between the third node and a ground terminal in series, and the sixth switch is connected with the fourth resistor in parallel; a third circuit portion comprising: the device is characterized in that the band gap reference circuit, the input offset compensation circuit and the voltage comparison circuit are fused together, so that the voltage detection precision can be improved, and the current detection precision is further improved.

However, in order to detect the input voltage at the high-voltage side, a group of output windings is additionally added to the similar products in the current market, so that the low-voltage side circuit can detect the input voltage at the high-voltage side in an isolated manner, and the high-frequency transformer is not easy to simplify.

SUMMERY OF THE UTILITY MODEL

The utility model provides a not enough to prior art, the utility model provides an utilize an output winding to realize power supply and voltage detection's circuit simultaneously, solved like product on the existing market for the realization needs additionally to increase a set of output winding to the detection of high-pressure side input voltage for realize that the low pressure side circuit is unfavorable for the problem of the simplification of high frequency transformer to the isolation detection of high-pressure side input voltage.

In order to achieve the above purpose, the utility model discloses a following technical scheme realizes: a circuit for realizing power supply and voltage detection simultaneously by utilizing one output winding comprises a power frequency alternating current VIN, wherein the power frequency alternating current VIN is rectified and filtered by diodes D1, D2, D6, D7 and C3 to become a 300V high-voltage direct current VDC, and the high-voltage direct current VDC is converted by a flyback high-frequency switch U1 and a flyback high-frequency transformer N1 to output low-voltage high-frequency rectification electricity by a flyback high-frequency transformer N2 winding.

Preferably, during the turn-off period of the flyback high-frequency switch U1, a negative half-cycle voltage is output from the N2 winding, and the voltage is rectified and filtered by D4 and C2 to become a low-voltage direct current VOUT, which supplies power to a low-voltage side circuit.

Preferably, during the on period of the flyback high-frequency switch U1, a positive half cycle voltage is output from the N2 winding, and the voltage is rectified and filtered by D8 and C4 to become a low-voltage direct current VS.

Preferably, the voltage of the power frequency alternating current VIN is 220V.

Preferably, the voltage of the high voltage direct current VDC is 300V.

Advantageous effects

The utility model provides an utilize output winding to realize power supply and voltage detection's circuit simultaneously, compare with prior art and possess following beneficial effect:

(1) the circuit for realizing power supply and voltage detection by using one output winding simultaneously converts power frequency alternating current VIN into 300V high-voltage direct current VDC after rectification and filtering through diodes D1, D2, D6, D7 and C3, the high-voltage direct current VDC outputs low-voltage high-frequency rectification electricity through a flyback high-frequency transformer N2 winding after being converted by a flyback high-frequency switch U1 and a flyback high-frequency transformer N1, and after the transformer is isolated, the detection circuit and the high-voltage circuit can be separated by using a low-voltage side winding N2, 2 rectifier diodes D4, D8 and 2 filter capacitors C2 and C4, so that the low-voltage direct current power supply VOUT is realized, and isolation detection of high-voltage side input voltage VIN is realized, therefore, the winding of the high-frequency transformer can be simplified, the device is reasonable in structural design, and the circuit cost is.

Drawings

Fig. 1 is a circuit diagram of the structure of the present invention.

In the figure: 1. power frequency alternating current VIN; 2. performing power frequency rectification; 3. high-voltage direct current VDC; 4. a flyback high-frequency switch; 5. a flyback high-frequency transformer; 6. low-voltage direct current VOUT for loading; 7. detecting low-voltage direct current output and high-voltage side input voltage; n2, low side winding; < D1, D2, D3, D4, D5, D6, D7, D8>, diode; < C1, C2, C3, C4>, filter capacitance.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, the present invention provides a technical solution: a circuit for realizing power supply and voltage detection simultaneously by utilizing an output winding comprises a power frequency alternating current VIN, wherein the power frequency alternating current VIN is rectified and filtered by diodes D1, D2, D6, D7 and C3 to become a 300V high-voltage direct current VDC, the high-voltage direct current VDC is converted by a flyback high-frequency switch U1 and a flyback high-frequency transformer N1 to output a low-voltage high-frequency rectification voltage by a winding N2, the negative half-cycle voltage is output from a winding N2 during the turn-off period of the flyback high-frequency switch U1, the voltage is rectified and filtered by the D4 and the C2 to become a low-voltage direct current VOUT, the low-voltage direct current VOUT supplies power to a low-voltage side circuit, the negative half-cycle voltage is output from a winding N2 during the turn-off period of the flyback high-frequency switch U1, the voltage is rectified and filtered by the D4 and C2 to become a low-voltage direct current, the high voltage dc power VDC has a voltage of 300V and is not described in detail in this specification, which is well known to those skilled in the art.

When the voltage regulator is used, a power frequency alternating current VIN is rectified and filtered by diodes D1, D2, D6, D7 and C3 to be changed into a 300V high-voltage direct current VDC, the high-voltage direct current VDC is converted by a flyback high-frequency switch U1 and a flyback high-frequency transformer N1 to be changed and then a flyback high-frequency transformer N2 winding outputs low-voltage high-frequency rectified current, a flyback high-frequency switch U1 outputs negative half-cycle voltage from an N2 winding during the turn-off period, the voltage is rectified and filtered by D4 and C2 to be changed into low-voltage direct current VOUT, the low-voltage direct current VOUT supplies power for a low-voltage side circuit, the voltage of the power frequency alternating current VIN is 220V, the voltage of the high-voltage direct current VS is 300V, and the constant proportion relation exists between the VIN and the input voltage of the high-voltage side, the value of VIN can be obtained by calculation under the condition that VS and VOUT are known, and the relationship between the voltage VS and the input voltage VIN is as follows: VS √ 2 × VIN × N2 ÷ N1+ VOUT, where N1 and N2 are the number of turns on the primary and secondary sides of the transformer.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A circuit for simultaneously realizing power supply and voltage detection by utilizing an output winding comprises a power frequency alternating current VIN (1), and is characterized in that: the power frequency alternating current VIN (1) is rectified and filtered by diodes D1, D2, D6, D7 and C3 to become 300V high-voltage direct current VDC (3), and the high-voltage direct current VDC (3) is converted by a flyback high-frequency switch (4) U1 and a flyback high-frequency transformer (5) N1, and then a flyback high-frequency transformer (5) N2 winding outputs low-voltage high-frequency rectification electricity.

2. A circuit for simultaneously implementing power supply and voltage detection using one output winding as claimed in claim 1, wherein: during the turn-off period of the flyback high-frequency switch (4) U1, negative half-cycle voltage is output from the N2 winding, the voltage is rectified and filtered by the D4 and the C2 and then becomes low-voltage direct current VOUT, and the low-voltage direct current VOUT supplies power for a low-voltage side circuit.

3. A circuit for simultaneously implementing power supply and voltage detection using one output winding as claimed in claim 1, wherein: during the turn-on period of the flyback high-frequency switch (4) U1, positive half-cycle voltage is output from the N2 winding, and the voltage is rectified and filtered by D8 and C4 to become low-voltage direct current VS.

4. A circuit for simultaneously implementing power supply and voltage detection using one output winding as claimed in claim 1, wherein: the voltage of the power frequency alternating current VIN (1) is 220V.

5. A circuit for simultaneously implementing power supply and voltage detection using one output winding as claimed in claim 1, wherein: the voltage of the high-voltage direct current VDC (3) is 300V.