Split DCDC power supply

Abstract

The utility model discloses a split DCDC power supply. The power source comprises a shell, a control circuit and an energy conversion circuit, wherein the control circuit and the energy conversion circuit are arranged in the shell. The control circuit is characterized in that the control circuit is arranged on the first PCB; the energy conversion circuit is arranged on the second PCB, and the second PCB is an aluminum substrate; the control circuit on the first PCB is connected with the energy conversion circuit on the second PCB through a connecting wire. A power supply is divided into a control circuit and an energy conversion circuit; and the energy conversion circuit which is easy to heat is arranged on the aluminum substrate PCB, so that the heat dissipation problem can be well solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a small low -power split DCDC power supply. BACKGROUND

[0002] DC-DC power supply is a common power supply, which is in the direct current circuit and changes one voltage value electric energy into another voltage value power supply.

[0003] At present on the market, most small DCDC power supplies adopt circuit monomer type design, namely all components of the power supply are designed on a circuit board, the transformer is placed in the center of the circuit board, and the input and output devices are used as the division of the layout board surface. In this case, when the power is slightly large, the heat generated by the heat generating elements will be transmitted to other control components through the heat conduction of the circuit board, resulting in high temperature of the module and unstable work. If the area of the single board is increased to improve the heat dissipation, it cannot meet the requirement of miniaturization. Military products have strict requirements on volume, and the size is required to be as small as possible. The quality requirement is also high, and the failure rate is required to be as low as possible. CONTENT OF THE UTILITY MODEL

[0004] In order to overcome the above problems, the utility model provides a small low -power split DCDC power supply.

[0005] In order to achieve the above purpose, the split DCDC power supply of the utility model, the power supply includes a shell and a control circuit and an energy conversion circuit arranged in the shell;The control circuit is arranged on the first PCB board;The energy conversion circuit is arranged on the second PCB board, and the second PCB board is an aluminum substrate;The control circuit on the first PCB board and the energy conversion circuit on the second PCB board are connected through connecting wires.

[0006] Further, a plurality of pin connectors are arranged on the shell, and the connector is provided with input connection pins, output connection pins and control connection pins.

[0007] Further, the energy conversion circuit includes an energy input circuit, an energy conversion transformer and an energy output circuit;Among them,

[0008] The energy input circuit is used for converting the input DC voltage into pulsed AC voltage under the control of the control circuit and outputting the pulsed AC voltage to the primary coil of the energy conversion transformer;

[0009] The energy conversion transformer is used for boosting the AC voltage received by the primary coil to a predetermined AC voltage and outputting from the secondary coil;

[0010] The energy output circuit is used for converting the pulsed AC voltage output by the transformer into DC voltage and outputting.

[0011] Further, the control circuit comprises an input control circuit and an output feedback circuit;

[0012] The input control circuit comprises a main control chip, an enabling circuit, a chip power supply circuit, an input voltage feedback circuit and a temperature feedback circuit connected with the main control chip.

[0013] Further, the main control chip is L6565D.

[0014] The enabling circuit is used for receiving a control signal from a control connection pin of a connector and outputting the control signal to a 5th pin of the main control chip to control starting and stopping of the main control chip.

[0015] The chip power supply circuit is used for converting a direct current voltage obtained from an input connection pin of the connector into a predetermined working voltage to provide a power supply for the control circuit.

[0016] The input voltage feedback circuit is used for monitoring a size of the input voltage and outputting a detection result to a 3rd pin of the main control chip to realize overvoltage protection.

[0017] The temperature feedback circuit is used for monitoring a working temperature of the power supply and outputting a detection result to a 1st pin of the main control chip to realize overheat protection.

[0018] The power supply is divided into a control circuit and an energy conversion circuit, and the energy conversion circuit which is easy to generate heat is arranged on the aluminum substrate PCB, so that the heat dissipation problem is solved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the utility model.

[0020] Figure 2 It is a circuit block diagram of the utility model.

[0021] Figure 3 It is a second PCB of the utility model embodiment.

[0022] Figure 4 It is a first PCB of the utility model embodiment.

[0023] Figure 5 It is a circuit diagram of the utility model embodiment.

[0024] Figure 6 It is Figure 5 The input voltage feedback circuit diagram in the middle.

[0025] Figure 7 It is Figure 5 The temperature feedback circuit diagram in the middle.

[0026] Figure 8 It isFigure 5 The middle output voltage feedback circuit diagram.

[0027] Figure 9 For Figure 5 The middle energy conversion transformer and energy output circuit.

[0028] Figure 10 For Figure 5 The middle energy input circuit.

[0029] Figure 11 For Figure 5 The middle first enable circuit.

[0030] Figure 12 For Figure 5 The middle second enable circuit.

[0031] Figure 13 For Figure 5 The middle power supply circuit. DETAILED DESCRIPTION

[0032] The embodiments of the present application will be described in detail below with reference to the drawings.

[0033] In the description of the present application, it is understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0034] The terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise stated, the meaning of "a plurality of" is two or more.

[0035] The split DCDC power supply of the present application comprises a shell 1 and a control circuit and an energy conversion circuit arranged in the shell; the control circuit is arranged on a first piece of PCB board 3, and the first piece of PCB can be a general PCB board, such as an FR4 series PCB board; the energy conversion circuit is arranged on a second piece of PCB board 2, and the second piece of PCB board is an aluminum substrate; the control circuit on the first piece of PCB board and the energy conversion circuit on the second piece of PCB board are connected through connecting wires. The first piece of PCB and the second piece of PCB board can be connected through studs.

[0036] By placing the heat-generating energy conversion circuitry on the second PCB board using the above structure, the heat dissipation problem can be effectively solved. For even better heat dissipation, such as... Figure 1 As shown, the second PCB board 2 is the base plate of the housing.

[0037] As a further improvement of this utility model, a multi-pin connector 4 is provided on the housing, and the connector is provided with input connection pins, output connection pins and control connection pins; these pins are connected to the first PCB board. The number of pins of the multi-pin connector can be selected as needed, for example, a 15-pin connector can be selected.

[0038] like Figure 2 As shown, the energy conversion circuit includes an energy input circuit, an energy conversion transformer, and an energy output circuit. The energy input circuit, under the control of the control circuit, converts the input DC voltage into a pulsating AC voltage and outputs it to the primary coil of the energy conversion transformer. The energy conversion transformer boosts the AC voltage received by the primary coil to a predetermined AC voltage and outputs it from the secondary coil. The energy output circuit converts the pulsating AC voltage output by the transformer back into DC voltage and outputs it. The energy conversion transformer typically generates a significant amount of heat. Therefore, as a further improvement of this invention, a window is provided on the first PCB board corresponding to the energy conversion transformer on the second PCB board. The energy conversion transformer 8 passes through this window and is positioned in the gap between itself and the housing. Insulating heat-dissipating adhesive 6 is filled in the gap to improve the heat dissipation of the energy conversion transformer.

[0039] The control circuit includes an input control circuit and an output feedback circuit;

[0040] The input control circuit includes a main control chip and an enable circuit, a chip power supply circuit, an input voltage feedback circuit, and a temperature feedback circuit connected to the main control chip. The main control chip can be selected as needed.

[0041] The present invention will be further described below with reference to the embodiments.

[0042] like Figures 5 to 13 As shown in the figure, in one embodiment of this utility model, the main control chip is L6565D; the L6565D power chip was launched by STMicroelectronics in 2016. It uses quasi-resonant (QR), zero-voltage switching (ZVS), and flyback converter current primary control technology to control the switching and current of the power supply. The L6565D power chip has 8 pins, and the functions of each pin are as follows:

[0043] Pin 1 is INV: Error Input, used to receive and process power supply error signals.

[0044] Pin 2 is COMP: error output, output the processed error signal to other circuits.

[0045] Pin 3 is VFF: line voltage feed forward, adjust the power capacity of the power supply according to the change of the main line voltage.

[0046] Pin 4 is CS: current sense input, when the current sense voltage exceeds 2V, the hiccup comparator will be started, thereby controlling the cutoff of the gate drive.

[0047] Pin 5 is ZCD: transformer demagnetization zero current detection input or external signal synchronization input; negative edge trigger MOSFET opening.

[0048] Pin 6 is GND: ground, provide a stable reference voltage for the chip.

[0049] Pin 7 is GD: output.

[0050] Pin 8 is VCC, power voltage: turn on when the power voltage reaches +13.5V, and turn off when it is lower than +9.5V.

[0051] The enable circuit is used to receive a control signal from the control connection pin of the connector to output to the 5 pin of the master control chip to control the start and stop of the master control chip; the enable circuit can be set as needed, Figure 11 The first enable circuit, when the high level is input at the end of R37, the transistors Q5 and Q1 are turned on, and the master control chip starts to work. Conversely, when it is low, it stops working. Figure 12 The second enable circuit, the second enable circuit uses an optocoupler to isolate the control of the second enable circuit and the 5 pin of the master control chip, when the high level is input at the end of R11, the optocoupler is turned on, and the master control chip starts to work. Conversely, when it is low, it stops working.

[0052] As Figure 13 shown, the chip power supply circuit is used to convert the direct current voltage obtained from the input connection pin of the connector into a predetermined working voltage to provide power supply for the master control chip, ensuring stable work of the chip power supply. The circuit converts the input 18-36V direct current voltage into 12V voltage by linear voltage stabilizing chip LM78L12ACMX, and outputs constant voltage to the master control chip.

[0053] The input voltage feedback circuit is used to monitor the size of the input voltage and output the detection result to the 3 pin of the master control chip to realize overvoltage protection; as Figure 6 shown, the input voltage is divided by the voltage dividing resistor and connected to the 3 pin of the master control chip to realize overvoltage protection.

[0054] The temperature feedback circuit is used to monitor the working temperature of the power supply and output the detection result to the 1 pin of the master control chip to realize overheat protection. As Figure 7As shown, it is composed of comparator TLV271IDBVR, zener diode Q3, temperature sensor (NTC-10K) and the like, and the zener diode is used to provide a stable voltage for the 3-pin of the comparator; the temperature sensor will make the voltage of the 4-pin of the comparator higher after the external environment is raised, thereby feeding back to the 1-pin of the main control chip, so that the chip stops working.

[0055] As shown in the figure, Figure 8 As shown, the output feedback circuit is composed of zener diode Q6, comparator, optocoupler and the like, and the zener diode is used to provide a stable voltage for the 3-pin of the comparator TLV271IDBVR; the 4-pin of the comparator is used to collect the output voltage, and after comparison by the comparator, the optocoupler U2 is used to feed back to the 2-pin of the main control chip, thereby adjusting the output duty cycle so that the output voltage is equal to the predetermined voltage, such as 80v.

[0056] As shown in the figure, Figure 10 As shown, the energy input circuit is used as a channel for the transformer primary input energy, and performs filtering processing on the input 18-36v low voltage; the amount of the transformer primary input energy is determined by the on and off time of the mos tube CJAC80SN10; the longer the on time is, the more the transformer primary input energy is.

[0057] As shown in the figure, Figure 9 As shown, the energy conversion transformer is used to convert the input voltage into an AC voltage of about 80VAC and output to the secondary circuit.

[0058] The energy output circuit is responsible for converting the pulsed AC voltage output by the transformer into a direct current of 80V through the rectifier diode ES3GC, and then stably outputting. The inductor L3A and the surrounding capacitor play a filtering role.

[0059] In the description of the utility model, it is necessary to explain that, unless there is definite stipulation and limitation, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, can also be detachable connection, or integrally connected, can be directly connected, can also be indirectly connected through intermediate medium, can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to specific circumstances.

[0060] In the description of the specification, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable way.

[0061] The above merely describes a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A split DCDC power supply, said power supply comprising a housing and a control circuit and an energy conversion circuit arranged in the housing; characterized in that, The control circuit is arranged on a first PCB board; the energy conversion circuit is arranged on a second PCB board, and the second PCB board is an aluminum substrate; and the control circuit on the first PCB board and the energy conversion circuit on the second PCB board are connected through connecting wires.

2. The split DCDC power supply of claim 1, wherein, The shell is provided with a multi-pin connector, and the connector is provided with an input connecting pin, an output connecting pin and a control connecting pin.

3. The split DCDC power supply of claim 1, wherein, The energy conversion circuit comprises an energy input circuit, an energy conversion transformer and an energy output circuit. The energy input circuit is used for converting an input DC voltage into a pulsating AC voltage under the control of the control circuit and outputting the pulsating AC voltage to a primary coil of the energy conversion transformer. The energy conversion transformer is used for boosting the AC voltage received by the primary coil to a predetermined AC voltage and then outputting the AC voltage from a secondary coil. The energy output circuit is used for converting the pulsating AC voltage output by the transformer into a DC voltage and then outputting the DC voltage.

4. The split DCDC power supply of claim 1, wherein, The second PCB board is a bottom plate of the shell.

5. The split DCDC power supply of claim 1, wherein, The first PCB board and the second PCB board are connected through studs.

6. The split DCDC power supply of claim 1, wherein, The control circuit comprises an input control circuit and an output feedback circuit. The input control circuit comprises a main control chip and an enabling circuit, a chip power supply circuit, an input voltage feedback circuit and a temperature feedback circuit connected with the main control chip.

7. The split DCDC power supply of claim 6, wherein, The main control chip is L6565D. The enabling circuit is used for receiving a control signal from the control connecting pin of the connector and outputting the control signal to a 5-pin of the main control chip, so as to control the start and stop of the main control chip. The chip power supply circuit is used for converting a DC voltage obtained from the input connecting pin of the connector into a predetermined working voltage and then providing a power supply for the control circuit. The input voltage feedback circuit is used for monitoring the size of the input voltage and outputting a detection result to a 3-pin of the main control chip, so as to realize overvoltage protection. The temperature feedback circuit is used for monitoring the working temperature of the power supply and outputting a detection result to a 1-pin of the main control chip, so as to realize overheat protection.

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