CN204517680U - A kind of interchange inputs doubleway output DC-stabilized circuit - Google Patents

Abstract

The utility model discloses a kind of interchange and input doubleway output DC-stabilized circuit, the high frequency transformer comprising electromagnetic interface filter, the rectification circuit connected with the output of electromagnetic interface filter and connect with the output of rectification circuit, and the first DC voltage output circuit and the second DC voltage output circuit; High frequency transformer be the high frequency transformer T1 with two groups of primary coils and two groups of secondary coils, high frequency transformer T1 first group of secondary coil two ends between be connected to leakage inductance peak absorbing circuit; First current rectifying and wave filtering circuit is connected to power supply indicator circuit and voltage feedback circuit; The output of the first current rectifying and wave filtering circuit is connected to current sampling circuit, and the output of current sampling circuit is connected to output overcurrent short-circuit protection circuit, and the output of output overcurrent short-circuit protection circuit connects with voltage feedback circuit.The utility model structure is simple, and realization is convenient and cost is low, and working stability is reliable, and loss is little, and ripple is little, practical, is convenient to promote the use of.

Description

An AC input dual output DC regulated power supply circuit

technical field

The utility model belongs to the technical field of power supply circuits, in particular to an AC input dual output DC stabilized voltage power supply circuit.

Background technique

Power supply circuits are widely used in various consumer electronic products, such as liquid crystal displays, liquid crystal televisions, etc., to provide working power for functional circuits inside the consumer electronic products. Currently, for consumer electronic products such as liquid crystal display devices, a power supply circuit is required to convert the AC voltage of the mains into a stable DC voltage to supply power to the load. Usually this kind of power supply circuit should have overload and short-circuit protection function. When the load is overloaded or short-circuited, the power supply circuit will automatically enter the protection state. Other switching power supplies on the market are used when the mains cannot continue to provide power. , to convert direct current to alternating current to continue to provide a short-term buffer to protect electrical devices. However, the power converter inside the power supply uses magnetic components such as inductors or transformers to convert DC to AC. The design of the magnetic components is complex and will greatly reduce the efficiency of the converter; In the case of small size and high efficiency, the cost is extremely high, resulting in high cost and high sales price of the entire consumer electronic product, which limits the promotion, application and development of consumer electronic products.

Utility model content

The technical problem to be solved by the utility model is to provide an AC input dual output DC stabilized voltage power supply circuit in view of the deficiencies in the above-mentioned prior art. The wave is small, the practicability is strong, the use effect is good, and it is convenient to popularize and use.

In order to solve the above technical problems, the technical solution adopted by the utility model is: an AC input dual output DC stabilized power supply circuit, which is characterized in that: it includes an EMI filter for connecting with 220V AC, and an EMI filter A rectifier circuit connected to the output end, a high-frequency transformer connected to the output end of the rectifier circuit, and a first DC voltage output circuit and a second DC voltage output circuit; the high-frequency transformer has two sets of primary coils and two sets of The high-frequency transformer T1 of the secondary coil, the leakage inductance peak absorbing circuit is connected between the two ends of the first group of secondary coils of the high-frequency transformer T1; the first DC voltage output circuit is composed of the first rectifying and filtering circuit and the second The first two-pin power supply interface J3 connected to the output end of a rectification and filtering circuit is composed of the first two-pin power interface J3, the first rectification and filtering circuit is connected to the first group of secondary coils of the high-frequency transformer T1, and the second DC voltage output The circuit is composed of a second rectifying and filtering circuit and a first two-pin power interface J2 connected to the output end of the second rectifying and filtering circuit. The second rectifying and filtering circuit is connected to the second group of secondary coils of the high-frequency transformer T1 connected; the first rectifying and filtering circuit is connected with a power indicator circuit and a voltage feedback circuit, and the first output terminal of the voltage feedback circuit is connected with the first group of primary coils of the high-frequency transformer T1, and the The second output terminal of the voltage feedback circuit is connected with the second group of primary coils of the high-frequency transformer T1; the output terminal of the first rectification filter circuit is connected with a current sampling circuit, and the output terminal of the current sampling circuit is connected with a An output overcurrent short circuit protection circuit, the output end of the output overcurrent short circuit protection circuit is connected to the voltage feedback circuit.

The above-mentioned AC input dual output DC stabilized power supply circuit is characterized in that: the EMI filter includes a three-pin power socket J1 for connecting to 220V AC, a fuse F1, a varistor R1, a non-polar capacitor C3 and Common-mode inductor L1, the pin of the three-pin power socket J1 used to connect the fire wire of 220V AC through the fuse F1 and one end of the varistor R1, one end of the non-polar capacitor C3 and the first input end of the common-mode inductor L1 connected, and grounded through the non-polar capacitor C1; the pin used to connect the neutral line of 220V AC in the three-pin power socket J1 is connected to the other end of the varistor R1, the other end of the non-polar capacitor C3 and the common mode The second input ends of the inductor L1 are connected to each other and grounded through the non-polar capacitor C2; the pins of the three-pin power socket J1 used to connect the ground wire of 220V AC are grounded, and the first output end of the common mode inductor L1 is the first output end of the EMI filter, and the second output end of the common mode inductor L1 is the second output end of the EMI filter.

The aforementioned AC input dual output DC stabilized power supply circuit is characterized in that: the rectifier circuit includes a rectifier diode D1, a rectifier diode D2, a rectifier diode D3 and a rectifier diode D4, and the anode of the rectifier diode D1 and the rectifier diode The negative electrode of D2 all joins with the first output end of EMI filter, and the anode of described rectifier diode D3 and the negative electrode of rectifier diode D4 all join with the second output end of EMI filter; The cathode of described rectifier diode D1 and The cathodes of the rectifier diode D3 are connected to each other and are the positive voltage output terminal of the rectifier circuit, and are grounded through the parallel connected polarity capacitor C5, polarity capacitor C6 and polarity capacitor C8; the anode of the rectifier diode D2 and the anode of the rectifier diode D4 It is connected and is the negative voltage output terminal of the rectifier circuit, and is grounded.

The above-mentioned AC input dual-output DC stabilized power supply circuit is characterized in that: one end of the first group of primary coils of the high-frequency transformer T1 is connected to the positive voltage output terminal of the rectifier circuit, and the high-frequency transformer T1 The other end of the first group of primary coils of the high-frequency transformer T1 is connected to the first output end of the voltage feedback circuit, and one end of the second group of primary coils of the high-frequency transformer T1 is connected to the second output end of the voltage feedback circuit. The other end of the second set of primary coils of the frequency transformer T1 is grounded.

The above-mentioned AC input dual output DC stabilized power supply circuit is characterized in that: the first rectification and filtering circuit includes a π-type LC filter composed of an I-shaped inductor L2, a polar capacitor C10 and a polar capacitor C13 circuit, and a Schottky diode D9 and a non-polar capacitor C14; the current sampling circuit is composed of a resistor R8; the anode of the Schottky diode D9 is connected to one end of the first group of secondary coils of the high-frequency transformer T1 connected, the cathode of the Schottky diode D9 is in succession with one end of the I-shaped inductor L2 and the positive pole of the polar capacitor C10, the other end of the I-shaped inductor L2, the positive pole of the polar capacitor C13 and the non-polar One end of the capacitor C14 is connected and is the positive voltage output end of the first rectification filter circuit, the other end of the first group of secondary coils of the high-frequency transformer T1, the negative pole of the polar capacitor C10, the negative pole of the polar capacitor C13 and The other end of the non-polar capacitor C14 is connected and is the negative voltage output end of the first rectification and filtering circuit, and is grounded; the first pin of the first two-pin power supply interface J3 is connected to the positive voltage of the first rectification and filtering circuit The output terminals are connected, the second pin of the first two-pin power supply interface J3 is connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the negative voltage output terminal of the first rectification filter circuit; The second rectification filter circuit includes a fast recovery diode D8 and a polar capacitor C9, the anode of the fast recovery diode D8 is connected to one end of the second group of secondary coils of the high frequency transformer T1, and the polar capacitor C9 The negative pole is connected to the other end of the second group of secondary coils of the high-frequency transformer T1 and is the negative pole voltage output end of the second rectification filter circuit, and is grounded. The cathode of the fast recovery diode D8 is connected to the polarity capacitor C9. The positive poles are connected and are the positive voltage output terminals of the second rectification and filtering circuit; the first pin of the second two-pin power interface J2 is connected with the negative voltage output terminal of the second rectification and filtering circuit, and the second two pins The second pin of the power interface J2 is connected to the positive voltage output end of the second rectification and filtering circuit.

The above-mentioned AC input dual output DC stabilized power supply circuit is characterized in that: the power supply indicator circuit is composed of a resistor R7 and a light emitting diode D10, and the anode of the light emitting diode D10 is connected to the first rectifying filter circuit through the resistor R7 The anode voltage output terminal of the LED is connected, and the cathode of the light emitting diode D10 is connected with the second pin of the first two-pin power supply interface J3.

The above-mentioned AC input dual output DC stabilized power supply circuit is characterized in that: the voltage feedback circuit includes an optocoupler chip PC817, a chip TOP224YN, a sliding rheostat R6, a polar capacitor C16, an integrated three-terminal voltage stabilizer chip TL431 and Fast recovery diode D6, the first pin of the optocoupler chip PC817 is connected to the cathode of the Schottky diode D9 through the series connected resistor R2 and resistor R3, the second pin of the optocoupler chip PC817 is connected to the integrated three-terminal The cathode of the voltage stabilizing chip TL431 is connected, and is connected to the cathode of the Schottky diode D9 through the resistor R4; the reference pole of the integrated three-terminal voltage stabilizing chip TL431 is connected to the sliding end of the sliding rheostat R6 and a fixed end, And through the resistance R14 to ground, the other fixed end of the sliding rheostat R6 is connected to the positive voltage output end of the first rectification filter circuit through the resistance R5, the anode of the integrated three-terminal voltage regulator chip TL431 is grounded, and the integrated three-terminal The reference electrode and the cathode of the terminal voltage regulator chip TL431 are connected with a parallel non-polar capacitor C11 and a non-polar capacitor C12; the third pin of the optocoupler chip PC817 is connected to the first pin of the chip TOP224YN, and The positive pole of the polar capacitor C16 is connected through the resistor R13, the second pin of the chip TOP224YN and the negative pole of the polar capacitor C16 are both grounded, and the third pin of the chip TOP224YN is the first output end of the voltage feedback circuit ; The fourth pin of the optocoupler chip PC817 is connected to the cathode of the fast recovery diode D6, and grounded through the polarity capacitor C7, and the anode of the fast recovery diode D6 is the second output terminal of the voltage feedback circuit.

The above-mentioned AC input dual output DC stabilized power supply circuit is characterized in that: the output overcurrent short circuit protection circuit includes a voltage comparator chip LM393 and a switching diode D11, and the second pin of the voltage comparator chip LM393 Connect with the positive pole voltage output end of the second rectification filter circuit (5) through resistance R10, and ground through resistance R11; The 3rd pin of described voltage comparator chip LM393 joins with one end of resistance R8 through resistance R9, so The 8th pin of the voltage comparator chip LM393 is connected to the positive voltage output terminal of the second rectification filter circuit, the 4th pin of the voltage comparator chip LM393 is grounded, and the 1st pin of the voltage comparator chip LM393 is grounded. The pin is connected to the anode of the switching diode D11, and is grounded through the parallel resistor R12 and the non-polar capacitor C15. The cathode of the switching diode D11 is the output end of the output overcurrent short circuit protection circuit, and is connected to the optocoupler chip PC817 The 2nd pins are connected.

The above-mentioned AC input dual output DC stabilized power supply circuit is characterized in that: the leakage inductance peak absorbing circuit is composed of a transient voltage suppression diode D5 and a fast recovery diode D7, and the anode of the transient voltage suppression diode D5 It is connected to one end of the first group of secondary coils of the high-frequency transformer T1, the cathode of the fast recovery diode D7 is connected to the cathode of the transient voltage suppression diode D5, and the anode of the fast recovery diode D7 is connected to the The other ends of the first set of secondary coils of the high-frequency transformer T1 are connected.

Compared with the prior art, the utility model has the following advantages:

1. The utility model is a power supply circuit capable of dividing the power of the 220V mains power supply and supplying it to the load. The circuit structure is simple, the design is reasonable, and the implementation is convenient.

2. While considering miniaturization, the utility model skillfully adopts a low-cost chip, and also has a low-cost over-current and short-circuit protection function.

3. The utility model is provided with an EMI filter, a first rectification filter circuit and a second rectification filter circuit, and a π-type LC filter circuit is used in the first rectification filter circuit, combined with a voltage feedback circuit, the output voltage can be adjusted The ripple suppression function reduces the ripple.

4. The utility model has the characteristics of miniaturization, stable and reliable operation, and low loss, and can be widely used in electronic equipment such as LCD TVs, computer displays, chargers, and other consumer electronic products.

5. The utility model has strong practicability, good use effect, and is convenient for popularization and use.

To sum up, the circuit structure of the utility model is simple, easy to realize, low in cost, stable and reliable in operation, small in loss, small in ripple, strong in practicability, good in use effect, and easy to popularize and use.

The technical solutions of the present utility model will be further described in detail through the drawings and embodiments below.

Description of drawings

Fig. 1 is the circuit schematic diagram of the utility model.

Explanation of reference signs:

1—EMI filter; 2—Rectifier circuit; 3—High frequency transformer;

4—the first rectification filter circuit; 5—the second rectification filter circuit; 6—leakage inductance peak absorption circuit;

7—power indicator light circuit; 8—voltage feedback circuit;

9—Output overcurrent short circuit protection circuit.

Detailed ways

As shown in Fig. 1, the utility model comprises the EMI filter 1 that is used to connect with 220V alternating current, the rectification circuit 2 that is connected with the output end of EMI filter 1 and the high frequency that is connected with the output end of rectification circuit 2 A transformer 3, and a first DC voltage output circuit and a second DC voltage output circuit; the high-frequency transformer 3 is a high-frequency transformer T1 having two sets of primary coils and two sets of secondary coils, the first of the high-frequency transformer T1 A leakage inductance peak absorbing circuit 6 is connected between the two ends of a group of secondary coils; the first DC voltage output circuit is composed of the first rectifying and filtering circuit 4 and the first two pins connected to the output terminal of the first rectifying and filtering circuit 4 The power interface J3 is composed of the first rectifying and filtering circuit 4 connected to the first group of secondary coils of the high-frequency transformer T1, and the second DC voltage output circuit is composed of the second rectifying and filtering circuit 5 and the second rectifying and filtering circuit 5. The output terminal of the filter circuit 5 is connected to the first two-pin power supply interface J2, and the second rectification filter circuit 5 is connected to the second group of secondary coils of the high-frequency transformer T1; the first rectification filter circuit 4 is connected with a power indicator circuit 7 and a voltage feedback circuit 8, the first output terminal of the voltage feedback circuit 8 is connected with the first group of primary coils of the high-frequency transformer T1, and the first output terminal of the voltage feedback circuit 8 The two output ends are connected with the second group of primary coils of the high-frequency transformer T1; the output end of the first rectification filter circuit 4 is connected with a current sampling circuit, and the output end of the current sampling circuit is connected with an output overcurrent short circuit A protection circuit 9 , the output terminal of the output overcurrent short circuit protection circuit 9 is connected to the voltage feedback circuit 8 .

As shown in Figure 1, in this embodiment, the EMI filter 1 includes a three-pin power socket J1 for connecting to 220V alternating current, a fuse F1, a varistor R1, a non-polar capacitor C3 and a common mode inductor L1, the The pin used to connect the live wire of 220V AC in the three-pin power socket J1 is connected to one end of the varistor R1, one end of the non-polar capacitor C3 and the first input end of the common mode inductor L1 through the fuse F1, and through the non-polar The polar capacitor C1 is grounded; the pin used to connect the neutral line of 220V AC in the three-pin power socket J1 is connected to the other end of the varistor R1, the other end of the non-polar capacitor C3 and the second input end of the common mode inductor L1 connected, and grounded through the non-polar capacitor C2; the pin used to connect the ground wire of the 220V alternating current in the three-pin power socket J1 is grounded, and the first output end of the common mode inductor L1 is the first output end of the EMI filter 1 An output terminal, the second output terminal of the common mode inductor L1 is the second output terminal of the EMI filter 1 . During specific implementation, the current rating of the fuse F1 is 2A, the voltage rating of the fuse F1 is 220V, and the fuse F1 is used to realize the self-fusing function in the case of a circuit short circuit, so as to prevent it from being in a long-term short circuit state. Cause damage to the power supply circuit and the equipment supplied with electric energy by the power supply circuit; the piezoresistor R1 is used to suppress surges. EMI filter 1 can allow low-frequency useful signals to pass through smoothly, and has a suppression effect on high-frequency interference. It can suppress the impact of high-frequency interference in the AC power grid on the equipment, and at the same time can suppress the interference of the equipment on the AC power grid, ensuring that the overall circuit is stable. Grid cleaning.

As shown in Figure 1, in this embodiment, the rectifier circuit 2 includes a rectifier diode D1, a rectifier diode D2, a rectifier diode D3, and a rectifier diode D4, and the anode of the rectifier diode D1 and the cathode of the rectifier diode D2 are connected to the EMI filter The first output end of the device 1 is connected, and the anode of the rectifier diode D3 and the cathode of the rectifier diode D4 are connected with the second output end of the EMI filter 1; the cathode of the rectifier diode D1 and the cathode of the rectifier diode D3 Connected and is the positive voltage output end of the rectifier circuit 2, and grounded through the parallel connected polar capacitor C5, polar capacitor C6 and polar capacitor C8; the anode of the rectifier diode D2 is connected to the anode of the rectifier diode D4 and is The negative voltage output end of the rectification circuit 2 is grounded. During specific implementation, the models of the rectifying diode D1, the rectifying diode D2, the rectifying diode D3 and the rectifying diode D4 are all 1N4007, and the polar capacitor C5, the polar capacitor C6 and the polar capacitor C8 are all used for rectification and filtering.

As shown in Figure 1, in this embodiment, one end of the first group of primary coils of the high-frequency transformer T1 is connected to the positive voltage output terminal of the rectifier circuit 2, and the first group of primary coils of the high-frequency transformer T1 The other end is connected to the first output end of the voltage feedback circuit 8, one end of the second group of primary coils of the high-frequency transformer T1 is connected to the second output end of the voltage feedback circuit 8, and the first output end of the high-frequency transformer T1 The other ends of the two sets of primary coils are grounded.

As shown in Figure 1, in this embodiment, the first rectification and filtering circuit 4 includes a π-type LC filter circuit composed of an I-shaped inductor L2, a polar capacitor C10 and a polar capacitor C13, and a Schottky diode D9 and a non-polar capacitor C14; the current sampling circuit is composed of a resistor R8; the anode of the Schottky diode D9 is connected to one end of the first group of secondary coils of the high-frequency transformer T1, and the Schottky The cathode of the base diode D9 is connected with one end of the I-shaped inductor L2 and the positive pole of the polar capacitor C10, and the other end of the I-shaped inductor L2, the positive pole of the polar capacitor C13, and one end of the non-polar capacitor C14 are connected. is the positive pole voltage output end of the first rectification filter circuit 4, the other end of the first set of secondary coils of the high frequency transformer T1, the negative pole of the polar capacitor C10, the negative pole of the polar capacitor C13 and the negative pole of the non-polar capacitor C14 The other ends are all connected and are the negative voltage output end of the first rectification and filtering circuit 4, and are grounded; the first pin of the first two-pin power supply interface J3 is connected to the positive voltage output end of the first rectification and filtering circuit 4 , the second pin of the first two-pin power supply interface J3 is connected to one end of the resistor R8, and the other end of the resistor R8 is connected to the negative voltage output end of the first rectification filter circuit 4; the second rectifier The filter circuit 5 includes a fast recovery diode D8 and a polar capacitor C9, the anode of the fast recovery diode D8 is connected to one end of the second group of secondary coils of the high frequency transformer T1, and the negative pole of the polar capacitor C9 is connected to The other end of the second group of secondary coils of the high-frequency transformer T1 is connected and is the negative voltage output end of the second rectification filter circuit 5, and is grounded. The cathode of the fast recovery diode D8 is connected to the positive electrode of the polarity capacitor C9 Connected and is the positive voltage output end of the second rectification and filtering circuit 5; the first pin of the second two-pin power supply interface J2 is connected with the negative voltage output end of the second rectification and filtering circuit 5, and the second two pins The second pin of the pin power interface J2 is connected to the positive voltage output end of the second rectification filter circuit 5 . During specific implementation, the model of the Schottky diode D9 is MBR20100CT, and the model of the fast recovery diode D8 is FR207; the input and output of the π-type LC filter circuit are both low impedance.

As shown in Figure 1, in this embodiment, the power indicator circuit 7 is composed of a resistor R7 and a light-emitting diode D10, and the anode of the light-emitting diode D10 is connected to the positive voltage output terminal of the first rectifying and filtering circuit 4 through the resistor R7. The cathode of the light emitting diode D10 is connected to the second pin of the first two-pin power supply interface J3.

As shown in Figure 1, in this embodiment, the voltage feedback circuit 8 includes an optocoupler chip PC817, a chip TOP224YN, a sliding rheostat R6, a polar capacitor C16, an integrated three-terminal voltage regulator chip TL431 and a fast recovery diode D6. The first pin of the optocoupler chip PC817 is connected to the cathode of the Schottky diode D9 through the series resistor R2 and resistor R3, and the second pin of the optocoupler chip PC817 is connected to the cathode of the integrated three-terminal voltage regulator chip TL431 connected, and connected to the cathode of the Schottky diode D9 through the resistor R4; the reference pole of the integrated three-terminal voltage regulator chip TL431 is connected to the sliding end of the sliding rheostat R6 and a fixed end, and connected to the ground through the resistor R14, so The other fixed end of the sliding rheostat R6 is connected to the positive voltage output end of the first rectifying and filtering circuit 4 through a resistor R5, the anode of the integrated three-terminal voltage stabilizing chip TL431 is grounded, and the anode of the integrated three-terminal voltage stabilizing chip TL431 is grounded. A parallel non-polar capacitor C11 and a non-polar capacitor C12 are connected between the reference electrode and the cathode; the third pin of the optocoupler chip PC817 is connected to the first pin of the chip TOP224YN, and is connected to the polarity through the resistor R13 The positive poles of the capacitor C16 are connected, the second pin of the chip TOP224YN and the negative pole of the polar capacitor C16 are grounded, and the third pin of the chip TOP224YN is the first output end of the voltage feedback circuit 8; the optocoupler The fourth pin of the chip PC817 is connected to the cathode of the fast recovery diode D6, and is grounded through the polarity capacitor C7. The anode of the fast recovery diode D6 is the second output end of the voltage feedback circuit 8. During specific implementation, the model of the fast recovery diode D6 is FR207, and the model of the integrated three-terminal voltage regulator chip TL431 is TL431A.

As shown in Figure 1, in this embodiment, the output overcurrent short-circuit protection circuit 9 includes a voltage comparator chip LM393 and a switching diode D11, and the second pin of the voltage comparator chip LM393 is connected to the second rectifier through a resistor R10. The anode voltage output terminal of filter circuit 5 is connected, and is grounded through resistance R11; The 3rd pin of described voltage comparator chip LM393 is connected with one end of resistance R8 through resistance R9, the 8th pin of described voltage comparator chip LM393 The pin is connected with the anode voltage output terminal of the second rectification filter circuit 5, the 4th pin of the voltage comparator chip LM393 is grounded, and the 1st pin of the voltage comparator chip LM393 is connected with the anode of the switching diode D11. connected, and grounded through the parallel resistor R12 and non-polar capacitor C15, the cathode of the switching diode D11 is the output end of the output overcurrent short circuit protection circuit 9, and is connected to the second pin of the optocoupler chip PC817 . During specific implementation, the model of the switching diode D11 is IN4148.

As shown in Figure 1, in this embodiment, the leakage inductance peak absorption circuit 6 is composed of a transient voltage suppression diode D5 and a fast recovery diode D7, and the anode of the transient voltage suppression diode D5 is connected to the high frequency transformer T1 One end of the first group of secondary coils is connected, the cathode of the fast recovery diode D7 is connected to the cathode of the transient voltage suppression diode D5, and the anode of the fast recovery diode D7 is connected to the first high frequency transformer T1 The other ends of the secondary coils are connected. During specific implementation, the model of the transient voltage suppression diode D5 is P6E200A, and the model of the fast recovery diode D7 is RF207.

When the utility model is used, the 220V alternating current connected through the three-pin power socket J1 is output to the rectifier circuit 2 after the EMI filter 1 filters out the high-frequency interference signal, and the rectifier circuit 2 converts the alternating current into direct current and then outputs it to the high-frequency transformer T1 , after the voltage conversion by the high-frequency transformer T1, it is divided into two outputs, the first is the 12V-18V DC voltage output by the first DC voltage output circuit, and the second is the 12V DC voltage output by the second DC voltage output circuit; The voltage feedback circuit 8 can detect the DC voltage output by the first DC voltage output circuit in real time. When the DC voltage output by the first DC voltage output circuit decreases, the internal duty cycle of the chip TOP224YN is increased, so that the first DC voltage The DC voltage output by the output circuit rises, and when the DC voltage output by the first DC voltage output circuit rises, the internal duty cycle of the chip TOP224YN decreases, thereby reducing the DC voltage output by the first DC voltage output circuit; resistor R8 is used To sample the output current of the first DC voltage output circuit, when the output is over-current or short-circuited, the first pin of the voltage comparator chip LM393 outputs a high level, and the optocoupler is isolated by the optocoupler chip PC817 and then output to the chip TOP224YN, the chip TOP224YN performs hiccup protection, thus functioning as output overcurrent and short circuit protection.

The above are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. Any simple modifications, changes and equivalent structural changes made to the above embodiments according to the technical essence of the present utility model still belong to Within the scope of protection of the technical solution of the utility model.

Claims (9)

1. one kind exchanges input doubleway output DC-stabilized circuit, it is characterized in that: the high frequency transformer (3) comprising the electromagnetic interface filter (1) for connecting with 220V alternating current, the rectification circuit (2) connected with the output of electromagnetic interface filter (1) and connect with the output of rectification circuit (2), and the first DC voltage output circuit and the second DC voltage output circuit, described high frequency transformer (3), for having the high frequency transformer T1 of two groups of primary coils and two groups of secondary coils, is connected to leakage inductance peak absorbing circuit (6) between first group of secondary coil two ends of described high frequency transformer T1, described first DC voltage output circuit is made up of the first current rectifying and wave filtering circuit (4) and the first bipod power interface J3 of connecting with the output of the first current rectifying and wave filtering circuit (4), described first current rectifying and wave filtering circuit (4) connects with first group of secondary coil of described high frequency transformer T1, described second DC voltage output circuit is made up of the second current rectifying and wave filtering circuit (5) and the first bipod power interface J2 of connecting with the output of the second current rectifying and wave filtering circuit (5), described second current rectifying and wave filtering circuit (5) connects with second group of secondary coil of described high frequency transformer T1, described first current rectifying and wave filtering circuit (4) is connected to power supply indicator circuit (7) and voltage feedback circuit (8), first output of described voltage feedback circuit (8) connects with first group of primary coil of described high frequency transformer T1, and the second output of described voltage feedback circuit (8) connects with second group of primary coil of described high frequency transformer T1, the output of described first current rectifying and wave filtering circuit (4) is connected to current sampling circuit, the output of described current sampling circuit is connected to output overcurrent short-circuit protection circuit (9), and the output of described output overcurrent short-circuit protection circuit (9) connects with voltage feedback circuit (8).

2. exchange input doubleway output DC-stabilized circuit according to one according to claim 1, it is characterized in that: described electromagnetic interface filter (1) comprises tripod supply socket J1 for connecting 220V alternating current, fuse F1, piezo-resistance R1, nonpolar electric capacity C3 and common mode inductance L1, connected by one end of fuse F1 and piezo-resistance R1, one end of nonpolar electric capacity C3 and the first input end of common mode inductance L1 for the pin that connects the live wire of 220V alternating current in described tripod supply socket J1, and by nonpolar electric capacity C1 ground connection; Connect for the other end of the pin with piezo-resistance R1 that connect the zero line of 220V alternating current, the other end of nonpolar electric capacity C3 and second input of common mode inductance L1 in described tripod supply socket J1, and by nonpolar electric capacity C2 ground connection; For connecting the pin ground connection of the ground wire of 220V alternating current in described tripod supply socket J1, first output of described common mode inductance L1 is the first output of electromagnetic interface filter (1), and second output of described common mode inductance L1 is the second output of electromagnetic interface filter (1).

3. exchange input doubleway output DC-stabilized circuit according to one according to claim 2, it is characterized in that: described rectification circuit (2) comprises rectifier diode D1, rectifier diode D2, rectifier diode D3 and rectifier diode D4, the anode of described rectifier diode D1 and the negative electrode of rectifier diode D2 all connect with the first output of electromagnetic interface filter (1), and the anode of described rectifier diode D3 and the negative electrode of rectifier diode D4 all connect with the second output of electromagnetic interface filter (1); The negative electrode of described rectifier diode D1 and the negative electrode of rectifier diode D3 connect and are the cathode voltage output of rectification circuit (2), and by polar capacitor C5, polar capacitor C6 in parallel and polar capacitor C8 ground connection; The anode of described rectifier diode D2 and the anode of rectifier diode D4 connect and are the cathode voltage output of rectification circuit (2), and ground connection.

4. exchange input doubleway output DC-stabilized circuit according to one according to claim 3, it is characterized in that: one end of first group of primary coil of described high frequency transformer T1 connects with the cathode voltage output of rectification circuit (2), the other end of first group of primary coil of described high frequency transformer T1 connects with the first output of voltage feedback circuit (8), one end of second group of primary coil of described high frequency transformer T1 connects with the second output of voltage feedback circuit (8), the other end ground connection of second group of primary coil of described high frequency transformer T1.

5. exchange input doubleway output DC-stabilized circuit according to the one described in claim 1 or 4, it is characterized in that: described first current rectifying and wave filtering circuit (4) comprises the π type LC filter circuit be made up of I-shaped inductive L2, polar capacitor C10 and polar capacitor C13, and Schottky diode D9 and nonpolar electric capacity C14, described current sampling circuit is made up of resistance R8, the anode of described Schottky diode D9 connects with one end of first group of secondary coil of described high frequency transformer T1, the positive pole of the negative electrode of described Schottky diode D9 and one end of I-shaped inductive L2 and polar capacitor C10 in succession, the other end of described I-shaped inductive L2, the positive pole of polar capacitor C13 and one end of nonpolar electric capacity C14 connect and are the cathode voltage output of the first current rectifying and wave filtering circuit (4), the other end of first group of secondary coil of described high frequency transformer T1, the negative pole of polar capacitor C10, the negative pole of polar capacitor C13 and the other end of nonpolar electric capacity C14 all connect and are the cathode voltage output of the first current rectifying and wave filtering circuit (4), and ground connection, 1st pin of described first bipod power interface J3 connects with the cathode voltage output of the first current rectifying and wave filtering circuit (4), 2nd pin of described first bipod power interface J3 connects with one end of resistance R8, and the other end of described resistance R8 connects with the cathode voltage output of the first current rectifying and wave filtering circuit (4), described second current rectifying and wave filtering circuit (5) comprises fast recovery diode D8 and polar capacitor C9, the anode of described fast recovery diode D8 connects with one end of second group of secondary coil of described high frequency transformer T1, the negative pole of described polar capacitor C9 connects with the other end of second group of secondary coil of described high frequency transformer T1 and is the cathode voltage output of the second current rectifying and wave filtering circuit (5), and ground connection, the negative electrode of described fast recovery diode D8 connects with the positive pole of polar capacitor C9 and is the cathode voltage output of the second current rectifying and wave filtering circuit (5), 1st pin of the second bipod power interface J2 connects with the cathode voltage output of the second current rectifying and wave filtering circuit (5), and the 2nd pin of described second bipod power interface J2 connects with the cathode voltage output of the second current rectifying and wave filtering circuit (5).

6. exchange input doubleway output DC-stabilized circuit according to one according to claim 5, it is characterized in that: described power supply indicator circuit (7) is made up of resistance R7 and light-emitting diode D10, the anode of described light-emitting diode D10 is connected with the cathode voltage output of the first current rectifying and wave filtering circuit (4) by resistance R7, and the negative electrode of described light-emitting diode D10 connects with the 2nd pin of the first bipod power interface J3.

7. exchange input doubleway output DC-stabilized circuit according to one according to claim 5, it is characterized in that: described voltage feedback circuit (8) comprises opto-coupler chip PC817, chip TOP224YN, slide rheostat R6, polar capacitor C16, integrated three-terminal voltage-stabilizing chip TL431 and fast recovery diode D6, 1st pin of described opto-coupler chip PC817 is connected with the negative electrode of Schottky diode D9 by the resistance R2 of series connection and resistance R3, 2nd pin of described opto-coupler chip PC817 connects with the negative electrode of integrated three-terminal voltage-stabilizing chip TL431, and connected with the negative electrode of Schottky diode D9 by resistance R4, the described integrated reference pole of three-terminal voltage-stabilizing chip TL431 connects with the sliding end of slide rheostat R6 and a stiff end, and by resistance R14 ground connection, another stiff end of described slide rheostat R6 is connected with the cathode voltage output of the first current rectifying and wave filtering circuit (4) by resistance R5, the plus earth of described integrated three-terminal voltage-stabilizing chip TL431, the reference pole of described integrated three-terminal voltage-stabilizing chip TL431 be connected to nonpolar electric capacity C11 in parallel and nonpolar electric capacity C12 between negative electrode, 3rd pin of described opto-coupler chip PC817 connects with the 1st pin of chip TOP224YN, and connected with the positive pole of polar capacitor C16 by resistance R13,2nd pin of described chip TOP224YN and the equal ground connection of negative pole of polar capacitor C16, the 3rd pin of described chip TOP224YN is the first output of voltage feedback circuit (8), 4th pin of described opto-coupler chip PC817 connects with the negative electrode of fast recovery diode D6, and by polar capacitor C7 ground connection, the anode of described fast recovery diode D6 is the second output of voltage feedback circuit (8).

8. exchange input doubleway output DC-stabilized circuit according to one according to claim 7, it is characterized in that: described output overcurrent short-circuit protection circuit (9) comprises voltage comparator chip LM393 and switching diode D11,2nd pin of described voltage comparator chip LM393 is connected with the cathode voltage output of the second current rectifying and wave filtering circuit (5) by resistance R10, and by resistance R11 ground connection, 3rd pin of described voltage comparator chip LM393 is connected with one end of resistance R8 by resistance R9, 8th pin of described voltage comparator chip LM393 connects with the cathode voltage output of the second current rectifying and wave filtering circuit (5), the 4th pin ground connection of described voltage comparator chip LM393, 1st pin of described voltage comparator chip LM393 connects with the anode of switching diode D11, and by resistance R12 in parallel and nonpolar electric capacity C15 ground connection, the negative electrode of described switching diode D11 is the output of output overcurrent short-circuit protection circuit (9), and connect with the 2nd pin of described opto-coupler chip PC817.

9. exchange input doubleway output DC-stabilized circuit according to one according to claim 1, it is characterized in that: described leakage inductance peak absorbing circuit (6) is made up of transient voltage suppressor diode D5 and fast recovery diode D7, the anode of described transient voltage suppressor diode D5 connects with one end of first group of secondary coil of described high frequency transformer T1, the negative electrode of described fast recovery diode D7 connects with the negative electrode of transient voltage suppressor diode D5, and the anode of described fast recovery diode D7 connects with the other end of first group of secondary coil of described high frequency transformer T1.