Semi-finished product detection circuit of integrated control board

Abstract

The utility model discloses a semi-finished product detection circuit of an integrated control board. The semi-finished product detection circuit comprises the integrated control board, an IPM over-current signal generation circuit, an IPM over-current detection analog circuit and a PFC over-current signal generation circuit. The IPM over-current signal generation circuit generates a forward sharp pulse signal and sends the forward sharp pulse signal to the IPM over-current detection analog circuit to generate an IPM over-current protection signal; the PFC over-current signal generating circuit is used for generating a negative sharp pulse signal so that a PFC over-current detection circuit arranged in the integrated control board generates a PFC over-current protection signal. The circuit provided by the utility model can simulate and generate an IPM overcurrent protection signal and a PFC overcurrent protection signal, so that whether the IPM overcurrent protection function and the PFC overcurrent protection function are effective or not is judged when an IPM module and a PFC module are not assembled, the test is carried out in advance, the problem of module burning caused by function failure at a finished product stage is avoided, the cost is greatly saved, and the efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of electronic circuits, and particularly to a semi-finished product detection circuit for an integrated control board. Background Art

[0002] A heat pump is a device that converts low-temperature heat energy in air, water, or soil into high-temperature heat energy for heating, cooling, or supplying hot water. Its basic principle is to use a refrigerant to achieve heat conversion through processes such as evaporation, compression, and condensation, converting low-temperature heat energy into high-temperature heat energy, thereby realizing heating or cooling of indoor air.

[0003] Household and commercial heat pumps need to invert the fixed-frequency power supply input from the power supply into a variable-frequency power supply through a variable-frequency compressor driver, thereby changing the rotational speed of the compressor and further realizing the adjustment of the system capacity.

[0004] The key components of existing conventional variable-frequency compressor drivers include an intelligent power module (IPM) and a power factor correction (PFC) module. Existing intelligent power modules (IPMs) and power factor correction (PFC) modules generally use an integrated control board. During the manufacturing process of the integrated control board, functional tests are usually carried out only at the finished product stage; if the overcurrent protection function of the IPM and PFC modules is missing before the finished product stage, it may cause the modules to burn out, resulting in relatively large economic and time losses.

[0005] Therefore, at the semi-finished product node of the integrated control board manufacturing (i.e., when the power devices in the IPM and PFC modules have not been assembled), it is necessary to test the functions of the relevant overcurrent protection circuits to ensure that they can play an effective protection role in the subsequent finished product test stage. Summary of the Utility Model

[0006] In order to solve the above technical problems, a circuit and method for testing the function of the overcurrent protection circuit at the semi-finished product node of the integrated control board are proposed.

[0007] To achieve the above object, the technical solution adopted by the utility model is as follows: it includes an integrated control board, an IPM overcurrent signal generating circuit, an IPM overcurrent detection simulation circuit, and a PFC overcurrent signal generating circuit. The integrated control board is internally provided with a PFC overcurrent detection circuit;

[0008] The IPM overcurrent signal generating circuit, the IPM overcurrent detection simulation circuit, and the PFC overcurrent signal generating circuit are all respectively connected to the integrated control board;

[0009] The IPM overcurrent signal generating circuit is used to generate a positive sharp pulse signal;

[0010] The IPM overcurrent detection simulation circuit is used to generate an IPM overcurrent signal;

[0011] The PFC overcurrent signal generation circuit is used to generate a negative sharp pulse signal;

[0012] The integrated control board is built-in with a PFC overcurrent detection circuit for generating a PFC overcurrent signal;

[0013] The integrated control board is used to receive the IPM overcurrent signal and the PFC overcurrent signal and detect the IPM overcurrent protection function and the PFC overcurrent protection function through the IPM overcurrent signal and the PFC overcurrent signal;

[0014] Preferably, the model of the integrated control board is MWH366 or other control boards with similar functions;

[0015] Preferably, the IPM overcurrent signal generation circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a push-button switch SW1. Among them, the resistor R2, the capacitor C1, and the push-button switch SW1 are connected in series in sequence. The other end of the resistor R2 is connected to the pin P5 of the integrated control board, and the other end of the push-button switch SW1 is connected to the pin P8 of the integrated control board;

[0016] The resistor R1 is connected in parallel between the pin P5 of the integrated control board and the pin P6 of the integrated control board, and the pin P6 of the integrated control board is grounded;

[0017] One end of the resistor R3 is connected between the capacitor C1 and the push-button switch SW1, and the other end is grounded.

[0018] Preferably, the IPM overcurrent detection analog circuit includes a resistor R8, a resistor R9, and an NPN-type triode Q1;

[0019] The resistor R8 is connected to the pin P4 of the integrated control board, and the resistor R9 is connected to the pin P3 of the integrated control board;

[0020] The C pole of the NPN-type triode Q1 is connected to the resistor R9, the B pole is connected to the resistor R8, and the E pole is grounded.

[0021] Preferably, the PFC overcurrent signal generation circuit includes a resistor R4, a resistor R6, a resistor R7, a capacitor C2, and a push-button switch SW2. Among them, the resistor R6, the capacitor C2, and the resistor R7 are connected in series in sequence. The other end of the R6 is connected to the pin P7 of the integrated control board, and the other end of the resistor R7 is connected to the pin P8 of the integrated control board;

[0022] The resistor R4 is connected in parallel between the pin P6 of the integrated control board and the pin P7 of the integrated control board;

[0023] One end of the push-button switch SW2 is connected between the capacitor C2 and the resistor R7, and the other end is grounded.

[0024] Preferably, the amplitude of the positive sharp pulse signal generated by the IPM overcurrent signal generation circuit is 0.877V, and the time constant τ is 57uS.

[0025] Preferably, the amplitude of the negative sharp pulse signal generated by the PFC overcurrent signal generation circuit is 0.455V, and the time constant τ is 11uS.

[0026] The beneficial technical effects of the present utility model are as follows: The circuit of the present utility model is provided with an overcurrent detection analog circuit, which can respectively generate an IPM overcurrent protection signal and a PFC overcurrent protection signal through the action of the IPM overcurrent signal generation circuit, the PFC overcurrent signal generation circuit and the integrated control board. Thus, when the IPM and PFC modules are not assembled, it can be judged whether the IPM overcurrent protection function and the PFC overcurrent protection function are effective, advancing the test and avoiding the problem of module burnout caused by function failure in the finished product stage, greatly saving costs and improving efficiency. Description of the Drawings

[0027] Figure 1 It is the electronic circuit schematic diagram of the semi-finished product detection circuit of the integrated control board of the present utility model. Detailed Embodiments

[0028] In order to make the purpose, technical solutions and advantages of the present utility model clearer, the following further describes the present utility model in detail with reference to embodiments. However, the scope of protection required by the present utility model is not limited to the following specific embodiments.

[0029] As Figure 1 described, it includes an integrated control board, an IPM overcurrent signal generation circuit, an IPM overcurrent detection analog circuit and a PFC overcurrent signal generation circuit. The integrated control board is internally provided with a PFC overcurrent detection circuit;

[0030] The IPM overcurrent signal generation circuit, the IPM overcurrent detection analog circuit and the PFC overcurrent signal generation circuit are respectively connected to the integrated control board;

[0031] The IPM overcurrent signal generation circuit is used to generate a positive sharp pulse signal;

[0032] The IPM overcurrent detection analog circuit is used to generate an IPM overcurrent signal;

[0033] The PFC overcurrent signal generation circuit is used to generate a negative sharp pulse signal;

[0034] The integrated control board is internally provided with a PFC overcurrent detection circuit for generating a PFC overcurrent signal;

[0035] The integrated control board is used to receive the IPM overcurrent signal and the PFC overcurrent signal and detect the IPM overcurrent protection function and the PFC overcurrent protection function through the IPM overcurrent signal and the PFC overcurrent signal.

[0036] Specifically, the IPM overcurrent signal generating circuit, the IPM overcurrent detection analog circuit, and the PFC overcurrent signal generating circuit are respectively connected to the integrated control board;

[0037] The IPM overcurrent signal generating circuit is used to generate a positive sharp pulse signal and send it to the integrated control board (hereinafter referred to as the board under test). After receiving the positive sharp pulse signal, the board under test transmits it to the IPM overcurrent detection analog circuit to generate an IPM overcurrent protection signal, and the latter then sends the generated overcurrent protection signal to the compressor control chip on the board under test;

[0038] The PFC overcurrent signal generating circuit is used to generate a negative sharp pulse signal and send it to the board under test. After receiving the negative sharp pulse signal, the board under test generates a PFC overcurrent protection signal by the on-board PFC overcurrent detection circuit and sends it to the compressor control chip on the board under test.

[0039] Preferably, the model of the integrated control board (board under test) is MWH366 or other control boards with similar functions, that is, the integrated control board containing the intelligent power module (IPM) and the power factor correction (PFC) module mentioned in the background technology, and the compressor control chip on its board can perform relevant overcurrent protection operations.

[0040] Specifically, the specific circuit principles of each circuit are as follows:

[0041] The IPM overcurrent signal generating circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1, and a push-button switch SW1. Among them, the resistor R2, the capacitor C1, and the push-button switch SW1 are connected in series in sequence. The other end of the R2 is connected to the pin P5 of the board under test, and the other end of the push-button switch SW1 is connected to the pin P8 of the board under test; the resistor R1 is connected in parallel between the pin P5 and the pin P6 of the board under test, and the pin P6 of the board under test is grounded; one end of the resistor R3 is connected between the capacitor C1 and the push-button switch SW1, and the other end is grounded.

[0042] Specifically, the resistor devices R1, R2, and the capacitor device C1 constitute a differentiating / step-down circuit. In this embodiment, the amplitude of the positive sharp pulse signal generated by the IPM overcurrent signal generating circuit is 0.877V, and the time constant τ is 57uS. The specific calculation is as follows:

[0043] Time constant τ=(R1 + R2)*C1=(100 + 470)×10 -7= 57 × 10 -6 (S) = 57 (uS)

[0044] Output amplitude Vo = Vi * R1 / (R1 + R2) = 5 × 100 / (100 + 470) = 0.877 (V)

[0045] Output internal resistance Ro = R1 * R2 / (R1 + R2) = 100 × 470 / (100 + 470) = 82 (Ω)

[0046] When the push-button switch SW1 is pressed, the differential / buck circuit generates a positive narrow pulse, which triggers the IPM over-current detection analog circuit through the pin P5 of the board under test to generate an IPM over-current signal, and transmits it to the compressor control chip on the board under test, causing it to generate a protection action and display an alarm message; when the push-button switch SW1 is released, the charge stored in the capacitor C1 will be released through the resistor device R3 for the next test.

[0047] The IPM over-current detection analog circuit includes a resistor R8, a resistor R9, and an NPN-type triode Q1. Among them, the resistor R8 is connected to the pin P4 of the board under test, and the resistor R9 is connected to the pin P3 of the board under test; the C pole of the NPN-type triode Q1 is connected to the resistor R9, the B pole is connected to the resistor R8, and the E pole is grounded.

[0048] Specifically, the resistors R8, R9, and the triode Q1 are used to replace and simulate the current detection function in the IPM (not yet assembled at this time). When the voltage at the pin P4 of the board under test reaches +0.5V, the triode Q1 starts to conduct, and the IPM over-current detection analog circuit simulates that the IPM module detects an over-current and generates an IPM over-current protection signal, which is transmitted to the compressor control chip on the board under test through the pin P3 of the board under test.

[0049] The PFC over-current signal generation circuit includes a resistor R4, a resistor R6, a resistor R7, a capacitor C2, and a push-button switch SW2. Among them, the resistor R6, the capacitor C2, and the resistor R7 are connected in series in sequence. The other end of the R6 is connected to the pin P7 of the board under test, and the other end of the resistor R7 is connected to the pin P8 of the board under test; the resistor R4 is connected in parallel between the pin P6 and the pin P7 of the board under test; one end of the push-button switch SW2 is connected between the capacitor C2 and the resistor R7, and the other end is grounded.

[0050] Specifically, the R4, R6, and C2 constitute a differential / buck circuit. The amplitude of the negative sharp pulse signal generated by the PFC over-current signal generation circuit is 0.455V, and the time constant τ is 11uS. The specific calculation process is as follows:

[0051] Time constant τ = (R4 + R6) * C2 = (100 + 1000) × 10 -8= 11×10 -6 (S) = 11 (μS);

[0052] The output amplitude Vo = Vi * R4 / (R4 + R6) = (-5) × 100 / (100 + 1000) = -0.455 (V);

[0053] The output internal resistance Ro = R4 * R6 / (R4 + R6) = 100 × 1000 / (100 + 1000) = 91 (Ω).

[0054] When the push-button switch SW2 is pressed, the PFC overcurrent signal generating circuit generates a PFC overcurrent signal, which is detected by the PFC overcurrent detection circuit on the board under test and transmitted to the compressor control chip on the board under test, causing it to generate a protection action and display an alarm message; when the push-button switch SW2 is released, the capacitor C2 will be pre-charged through the resistor R7 for the next test.

[0055] The working process of the present utility model is as follows:

[0056] (1) The test process of the IPM overcurrent protection function is as follows:

[0057] Step S1-1: The board under test is powered on, and the IPM overcurrent signal generating circuit is discharged;

[0058] Step S1-2: Briefly turn on the push-button switch SW1, and the IPM overcurrent signal generating circuit generates a positive sharp pulse, which is transmitted to the board under test through the pin P5 of the board under test;

[0059] Step S1-3: The positive sharp pulse is then transmitted to the IPM overcurrent detection analog circuit through the pin P4 of the board under test, causing it to generate an IPM overcurrent protection signal;

[0060] Step S1-4: The IPM overcurrent protection signal is transmitted to the compressor control chip on the board under test through the pin P3 of the board under test, and the compressor control chip on the board under test performs a protection operation;

[0061] Step S1-5: After the recovery period T1, turn on the push-button switch SW1 again, and repeat the above steps S1-1 to S1-4.

[0062] (2) The test process of the PFC overcurrent protection function is as follows:

[0063] Step S2-1: The board under test is powered on, and the PFC overcurrent signal generating circuit is charged;

[0064] Step S2-2: Briefly turn on the push-button switch SW2, and the PFC overcurrent signal generating circuit generates a negative sharp pulse, which is transmitted to the board under test through the pin P7 of the board under test;

[0065] Step S2-3: The negative sharp pulse is detected by the PFC overcurrent detection circuit on the board under test, causing it to generate a PFC overcurrent protection signal;

[0066] Step S2-4: The PFC overcurrent protection signal is transmitted to the compressor control chip on the board under test, and the compressor control chip on the board under test performs a protection operation;

[0067] Step S2-5: After the recovery period T2, the key switch SW2 is turned on again, and the above steps S2-1 to S2-4 are repeated.

[0068] Preferably, the range of the period T1 is 0.5S - 3S, and the range of the period T2 is 8S - 12S. In this embodiment, the range of T1 is 1S, and the range of T2 is 10S.

[0069] The circuit of the present utility model is provided with an IPM overcurrent signal generation circuit, an IPM overcurrent detection analog circuit, and a PFC overcurrent signal generation circuit, which respectively generate an IPM overcurrent protection signal and a PFC overcurrent protection signal under the action of the board under test, so as to judge whether the IPM overcurrent protection function and the PFC overcurrent protection function are effective when the IPM and PFC modules are not assembled, and advance the test to avoid the problem of module burnout caused by function failure in the finished product stage, greatly saving costs and improving efficiency.

[0070] According to the disclosure and teachings of the above specification, those skilled in the art to which the present utility model pertains can also make changes and modifications to the above embodiments. Therefore, the present utility model is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the utility model should also fall within the protection scope of the claims of the present utility model. In addition, although some specific terms are used in this specification, these terms are only for convenience of description and do not constitute any limitation to the utility model.

Claims

1. A semi-finished product detection circuit of an integrated control board, characterized in that: It includes an integrated control board, an IPM overcurrent signal generating circuit, an IPM overcurrent detection analog circuit and a PFC overcurrent signal generating circuit, wherein the integrated control board has a built-in PFC overcurrent detection circuit; The IPM overcurrent signal generating circuit, the IPM overcurrent detection analog circuit and the PFC overcurrent signal generating circuit are respectively connected to the integrated control board; The IPM overcurrent signal generating circuit is used to generate a positive sharp pulse signal; The IPM overcurrent detection analog circuit is used to generate an IPM overcurrent signal; The PFC overcurrent signal generating circuit is used to generate a negative sharp pulse signal; The integrated control board has a built-in PFC overcurrent detection circuit for generating a PFC overcurrent signal; The integrated control board is used to receive an IPM overcurrent signal and a PFC overcurrent signal and detect an IPM overcurrent protection function and a PFC overcurrent protection function through the IPM overcurrent signal and the PFC overcurrent signal.

2. The semi-finished product detection circuit of the integrated control board according to claim 1, characterized in that: The model of the integrated control panel is MWH366.

3. The semi-finished product detection circuit of the integrated control board according to claim 2, characterized in that: The IPM overcurrent signal generating circuit includes a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a key switch SW1, wherein the resistor R2, the capacitor C1 and the key switch SW1 are connected in series in sequence, the other end of the R2 is connected to the pin P5 of the integrated control board, and the other end of the key switch SW1 is connected to the pin P8 of the integrated control board; The resistor R1 is connected in parallel between the integrated control board pin P5 and the integrated control board pin P6, and the integrated control board pin P6 is grounded; One end of the resistor R3 is connected between the capacitor C1 and the key switch SW1 , and the other end is grounded.

4. The semi-finished product detection circuit of the integrated control board according to claim 2, characterized in that: The IPM over-current detection analog circuit includes a resistor R8, a resistor R9 and an NPN transistor Q1; The resistor R8 is connected to the pin P4 of the integrated control board, and the resistor R9 is connected to the pin P3 of the integrated control board; The C pole of the NPN transistor Q1 is connected to the resistor R9, the B pole is connected to the resistor R8, and the E pole is grounded.

5. The semi-finished product detection circuit of the integrated control board according to claim 2, characterized in that: The PFC overcurrent signal generating circuit comprises a resistor R4, a resistor R6, a resistor R7, a capacitor C2 and a key switch SW2, wherein the resistor R6, the capacitor C2 and the resistor R7 are connected in series in sequence, the other end of the resistor R6 is connected to the pin P7 of the integrated control board, and the other end of the resistor R7 is connected to the pin P8 of the integrated control board; The resistor R4 is connected in parallel between the integrated control board pin P6 and the integrated control board pin P7; One end of the key switch SW2 is connected between the capacitor C2 and the resistor R7, and the other end is grounded.

6. The semi-finished product detection circuit of the integrated control board according to claim 1, characterized in that: The amplitude of the positive sharp pulse signal generated by the IPM overcurrent signal generating circuit is 0.877V, and the time constant τ is 57uS.

7. The semi-finished product detection circuit of the integrated control board according to claim 1, characterized in that: The negative spike pulse signal amplitude generated by the PFC overcurrent signal generating circuit is 0.455V and the time constant τ is 11uS.

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